JPH08216814A - Air bag for vehicle - Google Patents

Abstract

PURPOSE: To easily make an inside cloth at a low cost by using reinforcing cloth in an air bag having the inside cloth to change flow of inflator gas. CONSTITUTION: An inside cloth 7 to change flow of inflator gas G is made by integrally extending two band parts 6 having width larger than a diameter of an inflator head part 3a respectively in the diametrical direction from an outer marginal part of reinforcing cloth 5 and sewing these band parts 6 on each other so that they make a ring shape in front of the inflator head part 3a on an air bag constituted by forming an opening part in which the head part 3a of an inflator 3 in inserted on a part of the air bag and sewing the reinforcing cloth 5 by way of polymerizing it in an circumference of this opening part.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As the airbag as described above, the one described in Japanese Utility Model Laid-Open No. 2-71052 is well known. That is, this airbag has an outer shape formed by superimposing two circular cloths, an inflator-side cloth and an occupant-side cloth, and stitching the outer peripheral edges of these cloths. 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 these two cloths is provided between the inflator side cloth and the passenger side cloth, and the outer peripheral edge portion of the inner cloth is the inflator side cloth. And sewn together with the passenger side cloth. Notches are formed intermittently on the outer peripheral edge of the inner cloth, and further, the inner cloth is
A portion that is circumferentially separated from the cutout portion at an intermediate position in the radial direction is sewn to the inflator side cloth.

In the airbag, the gas ejected from the inflator collides with the inner cloth and radially flows to the outer peripheral portion thereof, and further, the air bag is inflated into a flat shape through the notches of the inner cloth.

[0005]

However, in the above-mentioned conventional airbag, the inner cloth is large, and the notch is provided on the inner cloth, and the shape thereof is complicated. Must be set for each, and there is a disadvantage in terms of cost and man-hours.

The present invention copes with the above situation and finds a new structure for the reinforcing cloth which is polymerized in the opening portion of the airbag, whereby the inner cloth for gas flow control can be prepared easily and at low cost. That is the purpose.

[0007]

That is, the feature of the vehicle air bag of the present invention which meets the above-mentioned object is that an opening portion into which the head of the inflator is inserted is formed in a part of the airbag while the opening portion is formed. In an airbag formed by stacking and sewn a reinforcing cloth around the periphery of the bag, two belt-shaped portions having a width equal to or larger than the diameter of the inflator head are integrally extended in the diametrical direction from the outer peripheral edge of the reinforcing cloth. At the same time, these band-shaped portions are sewn to form an annular shape in front of the head of the inflator to form an inner cloth that changes the flow of inflator gas.

[0008]

In the air bag of the present invention, the gas blown out from the inflator hits the inner cloth and flows radially to reach the outer peripheral portion of the air bag. That is, since the airbag begins to deploy from the outer peripheral portion,
A shape close to the completion of expansion can be obtained early.

In the airbag of the present invention, the inner cloth for gas flow control is formed by simply sewing the band-shaped portion integrally extending from the reinforcing cloth. It can be created easily 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, and FIG. 2 is a plan view of an inflator side cloth of the same embodiment. As shown in FIG. 1, this airbag has an inflator side. The outer shape of the airbag is formed by sewing the outer peripheral edge portions of the cloth 1 and the passenger-side cloth 2. And
As shown in FIG. 2, an opening 4 into which the head portion 3a of the inflator 3 is inserted is formed substantially in the center of the inflator side cloth 1, and the airbag 4 is deployed around the opening 4. A reinforcing cloth 5 for securing pressure is superposed concentrically, and the inner and outer peripheral portions are sewn to the inflator side cloth 1 by sewing 8 and 9, respectively. In addition, P shown in FIG. 1 is a pad (cover) of the opening.

In such an airbag, in the embodiment of the present invention, as shown in FIGS. 3 and 4, the diameter of the reinforcing cloth 5 is equal to or larger than the diameter of the inflator head 3a in each one diametrical direction. The two strip-shaped portions 6 having a width of 1 are integrally extended, and as shown in FIG. 4, these strip-shaped portions 6 are sewn in front of the inflator head 3a by sewing 10 so as to form an annular shape. It is called inner cloth 7 that changes the flow.

The sewing of the band-shaped portion 6 for forming the inner cloth 7 is performed with the end portion 6a facing inward as shown in FIG.
Alternatively, as shown in FIG. 5, it is possible to perform each in a state of facing outward, and it is also possible to simply suture in a state of being vertically stacked.

In order to obtain an effective gas flow, the height of the inner cloth 7 is about 50 to 50 mm from the inflator head 3a at the time of 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, however, the gas G ejected from the inflator 3 hits the inner cloth 7 as shown in FIG. 1 to flow radially and reach the outer peripheral portion of the airbag. . As a result, the airbag begins to deploy from the outer peripheral portion, and thus it is possible to obtain a shape close to completion of inflation 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 sewing the band-shaped portion 6 integrally extending from the reinforcing cloth 5. As a result, the inner cloth 7 can be produced easily and at low cost.

[0017]

As described above, in the vehicle airbag of the present invention, the reinforcing cloth polymerized around the opening partly extends in the diametrical direction to form two strip portions, and these strip portions are formed. The inner cloth is sewn in an annular shape in front of the inflator head, and the inner cloth that controls the flow of the inflator gas is formed simply by sewing the band-shaped portion that extends integrally from the reinforcing cloth. This makes it possible to produce the above-mentioned inner cloth easily and at low cost, and has a remarkable effect of contributing to the cost reduction of the airbag.

[Brief description of 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 an inflator side cloth of the same embodiment.

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

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

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

[Explanation of symbols]

 1 Inflator Side Cloth 2 Occupant Side Cloth 3 Inflator 3a Inflator Head 4 Opening 5 Reinforcement Cloth 6 Band-shaped part 6a Band-shaped End 7 Inner Cloth 8 Sewing 9 Sewing 10 Inflator Gas P Pad

Claims (1)

[Claims] 1. A vehicle airbag in which an opening for inserting a head portion of an inflator is formed in a part of the airbag, and a reinforcing cloth is overlapped and sewn around the opening to provide the reinforcement. Two strip-shaped portions having a width equal to or larger than the diameter of the inflator head are integrally extended in the diametrical direction from the outer peripheral edge of the cloth, and these strip-shaped portions are sewn so as to form an annular shape in front of the inflator head. However, the vehicle airbag is characterized by being made of an inner cloth that changes the flow of the inflator gas.