JPH11314553A - Air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a device with a cost reduced, quickly extend toward the downward, and effectively protect a belly part of an occupant, by annularly sewing the mating free ends of a belt-shaped part extended to both sides from a relatively opposed part in the periphery of an opening part, in the forward of an inflator head part, and forming an inner cloth changing a flow of inflator gas. SOLUTION: An air bag is formed by sewing peripheral edge parts of an inflator side fabric 1 and an occupant side fabric 2 together. Two belt-shaped parts 6 having width of a diameter or more of an inflator head part 3a are integrally extended in the diametric direction from a peripheral edge part of a reinforcing fabric 5 in the periphery of an opening part. These belt-shaped parts 6 are sewn so as to form an annular shaped by sewing in the forward of the inflator head part 3a to provide an inner cloth 7 changing a flow of inflator gas G. This inner cloth 7 is opened in the vertical direction, the inflator gas G flows in the vertical direction after deflection. In this way, by starting inflation from an upper/lower peripheral parts, the bag is inflated quickly in the vertical direction, and a belly part of an occupant can be effectively protected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for an airbag device for a vehicle, and more particularly to an airbag for a vehicle in which the gas flow of an inflator is controlled by an internal cloth.

[0002]

2. Description of the Related Art As an airbag as described above, the one described in Japanese Utility Model Laid-Open No. 2-71052 is well known. That is, the outer shape of this airbag is formed by superimposing two circular cloths, an inflator-side cloth and an occupant-side cloth, and stitching the outer peripheral edges thereof. An opening into which the head of the inflator is inserted is formed substantially at the center.

In the airbag, an inner cloth having substantially the same diameter as the two cloths is interposed between the inflator-side cloth and the occupant-side cloth, and an outer peripheral edge of the inner cloth is connected to the inflator-side cloth. And sewn together with the occupant side cloth. A notch is formed intermittently at the outer peripheral edge of the inner cloth. Further, the inner cloth is sewn to the inflator-side cloth at a radially intermediate position from the notch at a circumferentially intermediate position. Have been.

[0004] In the above airbag, the gas ejected from the inflator radially collides with the inner cloth and flows to the outer peripheral portion.
Further, the airbag is inflated into a flat shape through the cutout portion of the inner cloth.

[0005]

However, in the above-mentioned conventional airbag, the shape is complicated, for example, the inner cloth is large and a notch is provided, and the sewing portion is also located between the outer peripheral edge of the inner cloth and the intermediate position. Respectively, which is disadvantageous in terms of cost and man-hour.

[0006] The present invention addresses the above-mentioned circumstances, and finds a new structure for the reinforcing cloth superimposed on the opening of the airbag, thereby making the inner cloth for gas flow control simple and at low cost. The purpose is to do so.

[0007]

That is, a feature of a vehicle airbag according to the present invention that meets the above-mentioned object is that an opening for inserting a head of an inflator is formed in a part of the airbag, while the opening is formed. In an airbag obtained by superposing and sewing a reinforcing cloth around the periphery, two belt-like portions each having a width equal to or larger than the diameter of the head of the inflator are respectively integrally extended from the outer peripheral edge of the reinforcing cloth. At the same time, these bands are sewn in an annular shape in front of the inflator head,
It is located in the inner fabric that changes the flow of inflator gas.

[0008]

In the airbag according to the present invention, the gas ejected from the inflator strikes the inner cloth, and flows radially to reach the outer periphery of the airbag. That is, since the deployment of the airbag starts from the outer peripheral portion, a shape close to the completion of inflation can be obtained early.

In the airbag according to the present invention, the inner cloth for gas float control is formed only by suturing a belt-like portion integrally extending from the reinforcing cloth. It can be created simply and at low cost.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an inflated state of an airbag according to an embodiment of the present invention. FIG. 2 is a plan view of an inflator-side cloth according to the embodiment. As shown in FIG. The outer shape of the airbag is formed by sewing the outer peripheral edges of the cloth 1 and the occupant-side cloth 2. And
As shown in FIG. 2, an opening 4 into which the head 3a of the inflator 3 is inserted is substantially at the center of the inflator-side cloth 1.
A reinforcement cloth 5 for securing the deployment pressure of the airbag is concentrically superimposed around the opening 4 and inner and outer peripheral portions are sewn on the inflator-side cloth 1, respectively. 9 sewn. In addition, P shown in FIG. 1 is an opening pad (cover).

In such an airbag, in the embodiment of the present invention, as shown in FIGS. 3 and 4, the diameter of the inflator head 3a is equal to or larger than the diameter of the inflator head 3a in one diameter direction from the outer peripheral edge of the reinforcing cloth 5. The two strips 6 having the widths shown in FIG. 4 are integrally extended, and as shown in FIG.
Is sewn in front of the inflator head 3a to form an annular shape by sewing 10 to form an inner cloth 7 for changing the flow of the inflator gas.

The suturing of the strip 6 for forming the inner cloth 7 is performed with the end 6a facing inward as shown in FIG.
Alternatively, as shown in FIG. 5, it is possible to carry out the stitching in a state facing outward, respectively, or it is also possible to suture simply in a state of being overlapped vertically.

In order to obtain an effective gas flow, the height of the inner cloth 7 should be about 50 to 50 mm from the inflator head 3a during the inflation shown in FIG.
It is desirable that they are separated by about 200 mm.

In the airbag according to the embodiment of the present invention, the gas G ejected from the inflator 3 strikes the inner cloth 7 as shown in FIG. 1 and flows radially to reach the outer periphery of the airbag. . Thus, the deployment of the airbag starts from the outer peripheral portion, so that a shape close to the completion of inflation can be obtained at an early stage.

In the airbag of the embodiment of the present invention, the gas flow control inner cloth 7 is formed only by suturing the band-like portion 6 integrally extending from the reinforcing cloth 5. Thus, the inner cloth 7 can be simply and inexpensively produced.

[0017]

As described above, in the airbag for a vehicle according to the present invention, the reinforcing cloth superposed around the opening is partially extended in the diameter direction to form two belts, and these belts are formed. The inner cloth is sewn in an annular shape in front of the head of the inflator to form an inner cloth.The inner cloth that controls the flow of inflator gas is formed simply by stitching the belt-shaped part that extends integrally from the reinforcing cloth. Thus, the above-mentioned inner cloth is produced simply and at low cost, and has a remarkable effect of contributing to the cost reduction of the airbag.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an inflated state of an airbag according to a first embodiment of the present invention.

FIG. 2 is a plan view of the inflator-side cloth of the embodiment.

FIG. 3 is a partial cross-sectional view illustrating a method of forming an inner cloth of the airbag of the embodiment.

FIG. 4 is a partial cross-sectional view showing a method for producing an inner cloth of the airbag of the embodiment.

FIG. 5 is a partial cross-sectional view showing another example of producing the inner cloth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inflator side cloth 2 Occupant side cloth 3 Inflator 3a Inflator head 4 Opening 5 Reinforcement cloth 6 Band part 6a End part of band part 7 Inner cloth 8 Sewing 9 Sewing 10 Sewing G Inflator gas P pad

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[Procedure amendment]

[Submission date] June 25, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Airbag device for vehicle

[Claims]

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, and more particularly to an airbag device for a vehicle having an airbag for controlling a gas flow of an inflator by an inner cloth provided therein.

[0002]

2. Description of the Related Art As an airbag device as described above, the one described in Japanese Utility Model Laid-Open No. 2-71052 is well known.
That is, the airbag for this airbag device is:
Two circular cloths of the inflator side cloth and the occupant side cloth are superimposed,
The outer shape is formed by suturing these outer peripheral edges, and an opening for inserting the head of the inflator is formed substantially at the center of the inflator-side base fabric.

In the airbag, an inner cloth having substantially the same diameter as the two cloths is interposed between the inflator-side cloth and the occupant-side cloth, and an outer peripheral edge of the inner cloth is connected to the inflator-side cloth. And sewn together with the occupant side cloth. A notch is formed intermittently at the outer peripheral edge of the inner cloth. Further, the inner cloth is sewn to the inflator-side cloth at a radially intermediate position from the notch at a circumferentially intermediate position. Have been.

[0004] In the above airbag, the gas ejected from the inflator radially collides with the inner cloth and flows to the outer peripheral portion.
Further, the airbag is inflated into a flat shape through the cutout portion of the inner cloth.

[0005]

However, in the above-mentioned conventional airbag, the shape is complicated, for example, the inner cloth is large and a notch is provided, and the sewing portion is also located between the outer peripheral edge of the inner cloth and the intermediate position. Respectively, which is disadvantageous in terms of cost and man-hour.

[0006] Further, what is important for the airbag is to rapidly deploy it in the vertical direction, particularly in the downward direction, to protect the abdomen of the occupant. As shown in the figure, the sewing portion 7 is located on the lower side, that is, on the abdomen side of the occupant, so that it does not open downward, and therefore, the airbag does not rapidly deploy downward. .

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned circumstances and finds a new structure for a reinforcing cloth superimposed on an airbag opening, thereby making the inner cloth for gas flow control simple and at low cost. It is another object of the present invention to provide an airbag device having an airbag that can be quickly deployed downward and effectively protect the occupant's abdomen.

[0008]

That is, a feature of the vehicle airbag device according to the present invention that meets the above-mentioned object is that an opening portion into which a head of an inflator is inserted is formed in a part of the airbag. Free ends of two belt-shaped portions extending from opposing portions around the opening are sewn together in an annular shape in front of the head of the inflator to form an inner cloth for changing the flow of inflator gas. The gas outlets are located vertically.

[0009]

In the airbag device of the present invention, the gas ejected from the inflator hits the inner cloth of the airbag, so that the gas flows vertically and reaches the outer peripheral portion of the airbag quickly. As a result, the airbag is quickly deployed in the vertical direction, particularly in the downward direction, and the abdomen of the occupant can be effectively protected.

In the airbag according to the present invention, the free ends of the upper portions of the two belts extending from opposing portions around the opening are joined to form an annular shape in front of the head of the inflator. This is an inner cloth that changes the flow of gas, which makes it possible to produce the inner cloth simply and at low cost.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an inflated state of an airbag according to an embodiment of the present invention, and FIG. 2 is a plan view of an inflator-side cloth according to the embodiment. As shown in FIG. The outer shape of the airbag is formed by sewing the outer peripheral edges of the cloth 1 and the occupant-side cloth 2. And
As shown in FIG. 2, an opening 4 into which the head 3a of the inflator 3 is inserted is substantially at the center of the inflator-side cloth 1.
A reinforcement cloth 5 for securing the deployment pressure of the airbag is concentrically superimposed around the opening 4 and inner and outer peripheral portions are sewn on the inflator-side cloth 1, respectively. 9 sewn. In addition, P shown in FIG. 1 is an opening pad (cover).

In such an airbag, free ends of two belt-like portions extending from opposing portions of the opening of the airbag are joined together. That is, in the embodiment of the present invention, as shown in FIGS. 3 and 4, two pieces each having a width equal to or larger than the diameter of the inflator head 3 a in one diametric direction from the outer peripheral edge of the reinforcing cloth 5. The belts 6 are integrally extended, and as shown in FIG. 4, these belts 6 are sewn in an annular shape by sewing 10 in front of the inflator head 3a, and an inner cloth 7 for changing the flow of the inflator gas is formed. And that. As shown in FIG. 1, the inner cloth 7 is vertically opened, and the inflator gas flows vertically after being deflected.

The suturing of the band-shaped portion 6 for forming the inner cloth 7 is performed with the end 6a facing inward as shown in FIG.
Alternatively, as shown in FIG. 5, it is possible to carry out the stitching in a state facing outward, respectively, or it is also possible to suture simply in a state of being overlapped vertically.

In order to obtain an effective gas flow, the height of the inner cloth 7 should be about 50 to 50 mm from the inflator head 3a during the inflation shown in FIG.
It is desirable that they are separated by about 200 mm.

In the airbag according to the embodiment of the present invention, the gas G ejected from the inflator 3 strikes the inner cloth 7 as shown in FIG. To reach. As a result, the airbag starts to be deployed from the upper and lower outer peripheral portions, so that the airbag is quickly deployed in the vertical direction, and the abdomen of the occupant can be effectively protected.

In the airbag of the embodiment of the present invention, the gas flow control inner cloth 7 is formed only by suturing the band-like portion 6 extending integrally from the reinforcing cloth 5. Thus, the inner cloth 7 can be simply and inexpensively produced.

[0018]

As described above, the airbag in the airbag device for a vehicle according to the present invention forms an opening into which a head of an inflator is inserted in a part of the airbag, and the periphery of the opening. The free ends of the two belt-shaped portions extending from the opposing portions are sewn together in an annular shape in front of the head of the inflator to form an inner cloth that changes the flow of the inflator gas. It is designed to be located up and down, just by suturing the strip,
An inner cloth for controlling the flow of the inflator gas can be formed, which has a remarkable effect that the inner cloth can be simply and inexpensively manufactured and contributes to a reduction in the cost of the airbag.

Further, since the inner cloth of the airbag is provided with an opening for gas outflow in the vertical direction, the inflator gas is deflected by the inner cloth and then quickly flows in the vertical direction. Thus, the upper and lower portions of the outer peripheral portion of the airbag, in particular, are quickly deployed, and the abdomen of the occupant can be effectively protected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an inflated state of an airbag in an airbag device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the inflator-side cloth of the embodiment.

FIG. 3 is a partial cross-sectional view illustrating a method of forming an inner cloth of the airbag of the embodiment.

FIG. 4 is a partial cross-sectional view showing a method for producing an inner cloth of the airbag of the embodiment.

FIG. 5 is a partial cross-sectional view showing another example of producing the inner cloth.

[Description of Signs] 1 Inflator side cloth 2 Occupant side cloth 3 Inflator 3a Inflator head 4 Opening 5 Reinforcement cloth 6 Band 6a End of band 7 Inner cloth 8 Sewing 9 Sewing 10 Sewing G Inflator gas P pad

Claims (1)

[Claims] 1. An airbag for a vehicle, wherein an opening into which a head of an inflator is inserted is formed in a part of the airbag, and a reinforcing cloth is superposed and sewn around the opening. Two belt-shaped portions each having a width equal to or larger than the diameter of the inflator head are respectively integrally extended from the outer peripheral edge of the cloth in the diameter direction, and these belt-shaped portions are sewn to form an annular shape in front of the inflator head. And an inner cloth for changing the flow of the inflator gas.