JPH10203281A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the manufacturing process of an air bag so as to reduce costs by reducing the number of part items for an air bag having a regulation member inside an air bag main body and easily securing a strength for an attaching part. SOLUTION: An air bag has a regulation member (inner bag) 20 inside an air bag main body 10 for regulating the flow direction of gas from an inflator. In this case, the regulation member 20 is formed by folding and inserting a portion integrally extended from base cloth pieces 10a and 10b constituting the air bag main body 10 in a bag state and the part overlapped by the folding is to become an attaching part 30 for the inflator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag which is inflated and deployed by gas generated from an inflator when a vehicle receives an impact load of a certain degree or more.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-262195, an airbag is composed of an airbag body and a regulating member (inner bag) provided therein. The regulating member has a plurality of ventilation holes, and guides the gas from each ventilation hole in a predetermined direction in the airbag body while regulating the flow direction of the gas sent from the inflator. By the function of such a regulating member, it is possible to quickly inflate and deploy the airbag body into a desired shape.

[0003]

However, in this type of airbag, the airbag body and the inner bag must be individually manufactured and connected to each other in a predetermined positional relationship. Therefore, the number of sewing steps and the like for manufacturing the airbag increases, and the cost of the airbag increases. Further, it is necessary for the mounting portion of the airbag to the inflator to have a certain degree of strength by, for example, making the base fabric constituting the airbag at least double, which also causes a cost increase.

An object of the present invention is to manufacture an airbag by reducing the number of parts of the airbag having a regulating member inside the airbag body and easily securing the strength of the mounting portion. The purpose is to simplify the process and reduce costs. Another object of the present invention is to increase the strength of the mounting portion by simple means in addition to the above-mentioned objects.

[0005]

According to the first aspect of the present invention,
An airbag having a regulating member for regulating a flow direction of gas from an inflator inside an airbag body,
The restricting member is formed by folding a part integrally extended from a base fabric constituting the airbag body into the inside of the airbag body in a bag state, and a part that is superimposed by this folding is a mounting portion for the inflator. It is characterized by being.

According to the first aspect of the present invention, since the portion extended from the base cloth is folded back into the airbag body in a bag state to form the regulating member, the airbag is formed. The number of parts can be reduced, and the strength of the mounting portion can be ensured by using the portion overlapped by the folding as a mounting portion for the inflator.

According to a second aspect of the present invention, there is provided the airbag according to the first aspect, wherein a reinforcing portion is formed on the inner and outer peripheries of a mounting portion for the inflator. In the case of the present invention, in addition to the function of the invention described in claim 1, the strength of the mounting portion is enhanced by simple means by the reinforcing portion.

[0008]

Embodiments of the present invention will be described below. Embodiment 1 FIG. 1 is a perspective view showing a completed airbag, and FIG. 2 is a sectional view of the completed airbag. As shown in these drawings, an inner bag 20 is located inside the airbag body 10 and the inner bag 2
0 is open to the outside at an attachment portion 30 of the airbag to an inflator (not shown). The inner bag 20 has a plurality (two) of ventilation holes 22 communicating with the inside of the airbag body 10.

When the airbag is mounted on the vehicle, the mounting portion 30 is mounted on the inflator by a plurality of mounting holes 32 formed therein. When gas is generated from the inflator when the vehicle receives an impact load of a certain level or more, the gas enters the inner bag 20 from the mounting portion 30, where the flow direction thereof is regulated and the mounting holes 32 From the airbag body 10. That is, the inner bag 20 functions as a “regulating member” that regulates the flow direction of the gas from the inflator. Then, the airbag main body 10 is inflated and deployed in a predetermined shape by the gas introduced therein.

Next, a procedure for producing the airbag will be described. First, as shown in FIG. 3, the cloth bodies 1a and 1b constituting the airbag are one piece of cloth connected by a fold line 12. The cloth bodies 1a and 1b are made up of base cloths 10a and 10b serving as the airbag main body 10, and portions 20a extending integrally therefrom and serving as the inner bag 20.
20b and portions 30a and 30b to be the mounting portions 30 are provided. In addition, the part 20 which becomes the inner bag 20
The ventilation holes 22 are already formed in a and 20b, and the mounting holes 32 are formed in portions 30a and 30b that become the mounting portions 30.

Therefore, as shown in FIG.
a and 1b are folded along the fold line 12 to overlap each other. Then, as shown in FIG.
In the outer edge 14 of the outer bag 1b, other regions except the distal end portions S of the portions 20a and 20b to be the inner bags 20 are sewn with the sewing thread 16. In this state, the cloth bodies 1a, 1
The front and back of b are reversed, and thereafter, the edge of the front end portion S is sewn.

Next, as shown in FIG. 3C, the portions 20a and 20b serving as the inner bag 20 are replaced with the inner bag 20 shown in FIG.
The airbag body 1 is folded back at the fold 18 shown in FIG.
It is pushed into the base cloths 10a and 10b which become zero. Thereby, the inner bag 20 is placed inside the airbag body 10.
Is located, and a portion 30 that becomes the mounting portion 30
a and 30b have a double structure due to the above-mentioned folding.

The portion 30 serving as the mounting portion 30 is described above.
a and 30b are strengths to withstand the force when the airbag is inflated and deployed as described above, since the cloth inside and outside of the mounting portion 30 is connected at the fold 18. Is sufficiently secured. In other words, in a structure in which the cloth inside the mounting portion 30 and the cloth outside the mounting portion 30 are not connected, when the airbag is inflated and deployed, the mounting hole 3 is used.
There is a possibility that the fiber near 2 may slip off from the inflator.
It is necessary to take measures such as extra lengthening of the cloths 0a and 30b, which causes an increase in cost.

The cloth bodies 1a and 1b may have the same shape or different shapes as shown in FIG. 3, and these are connected to each other by sewing separate cloth pieces at the fold 12. May be used. Furthermore, the cloth body 1a,
1b is the base cloths 10a and 10b cut individually;
It is also possible to adopt a configuration in which the portions 20a and 20b serving as the inner bag 20 and the portions 30a and 30b serving as the attachment portions 30 are integrally connected later by sewing.

Embodiment 2 FIGS. 4 and 5 show an example for reinforcing the mounting portion 30 of the airbag. FIG. 4 shows a state in which the outer edges 14 of the cloth bodies 1a and 1b have been completely sewn. Perspective view, FIG. 5 (A)
5A is a cross-sectional view of the completed airbag, and FIG. 5B is a cross-sectional view showing a part of FIG. 5A in an enlarged manner. As shown in these drawings, in the present embodiment, a reinforcing cloth is provided on the cloths 30a and 30b serving as the attachment parts 30 of the cloth bodies 1a and 1b, with the cloth inside the attachment parts 30 and the cloth outside the attachment parts 30. 40 are stacked on each other. These reinforcing cloths 40 are sewn to the portions 30a and 30b to be the mounting portions 30 by sewing threads 16 for sewing the outer edges 14 of the cloth bodies 1a and 1b, respectively, and constitute “reinforcing portions” of the mounting portions 30.

[0016] The other preparation procedures are almost the same as those in the first embodiment, and the duplicate description will be omitted. Further, in the third embodiment and the subsequent embodiments to be described below, duplicate explanations are omitted based on the same idea.

Third Embodiment FIG. 6 is a perspective view showing cloth bodies 1a and 1b before sewing in a third embodiment, FIG. 7A is a sectional view of a completed airbag,
FIG. 7B is a cross-sectional view illustrating a part of FIG. 7A in an enlarged manner. As is apparent from these drawings, also in the present embodiment, the cloth bodies 1a, 1a,
Reinforcing cloths 40 are overlapped with the portions 30a and 30b serving as the attachment portions 30 in 1b, respectively, over the cloth inside and outside the attachment portion 30.

However, in the third embodiment, each reinforcing cloth 40 has a portion 30a, 3 that becomes the mounting portion 30 by a sewing thread 42 different from the sewing thread 16 for sewing the outer edge 14 of the cloth bodies 1a, 1b.
0b, respectively, and constitutes a “reinforcing portion” of the mounting portion 30. That is, in the present embodiment, the mounting portion 3
By sewing the reinforcing cloth 40 individually to the portions 30a and 30b that become zero, compared with the second embodiment, the reinforcing cloth 40 is sewn.
The number of layers of cloth to be sewn at one time at the time of sewing is small, and workability is good.

Fourth Embodiment FIG. 8 is a perspective view showing cloth bodies 1a and 1b before sewing in a fourth embodiment, and FIG. 9 is a sectional view of a completed airbag.
In the fourth embodiment, portions 30a, 3
By forming the folded portion 50 on the outer side and sewing the outer edges 14 of the cloth bodies 1a and 1b, the "reinforcing portion" of the mounting portion 30 is formed without using the reinforcing cloth 40. The form of the folded portion 50 may be the shape shown in FIGS.

Fifth Embodiment FIG. 12 shows a modification of the second embodiment shown in FIGS. 4 and 5, and FIGS. 13 and 14 show a modification of the third embodiment shown in FIGS. . FIGS. 12 to 14A are perspective views each showing a state immediately after the cloth bodies 1a and 1b are sewn upside down, and FIG. 12B is a perspective view showing a completed airbag. In the fifth embodiment shown in these drawings, the overall shape of the airbag is different from the conventional spherical shape, and a quadrangular pyramid shape is taken as an example.

In the embodiment shown in FIGS. 12 and 14, the end of the portion to be the inner bag 20 is the fold 12. Further, in the embodiment shown in FIG. 14, a constricted portion is formed near the fold 18 of the portion to be the attachment portion 30 as shown in FIG. FIG. 1
As shown in FIG. 4 (B), curved portions 60 are formed on both sides of the mounting portion 30 so as to conform to the shape of the inflator side.

In Embodiments 2 to 5 described above,
A “reinforcing portion” of the reinforcing cloth 40 or the folded portion 50 is formed inside and outside the mounting portion 30. The “reinforcing portion” protects the airbag body 10 and the inner bag 20 from a high-temperature gas generated by an inflator in a portion inside the mounting portion 30, and
The outer part of the airbag serves to protect the airbag body 10 from friction with an airbag door or an airbag case (both not shown).

[Brief description of the drawings]

FIG. 1 is a perspective view of a completed airbag.

FIG. 2 is a cross-sectional view of the completed airbag.

FIG. 3 is a perspective view showing a procedure for producing an airbag.

FIG. 4 is a perspective view showing a state in which sewing of the airbag according to the second embodiment is completed.

FIG. 5 is a sectional view showing the completed airbag of FIG. 4;

FIG. 6 is a perspective view showing a state before sewing of an airbag according to a third embodiment.

FIG. 7 is a sectional view showing the completed airbag of FIG. 6;

FIG. 8 is a perspective view illustrating a state before sewing an airbag according to a fourth embodiment.

FIG. 9 is a sectional view showing the completed airbag of FIG. 8;

FIG. 10 is a perspective view showing a state before sewing of the airbag according to the fourth embodiment.

FIG. 11 is a sectional view showing the completed airbag of FIG. 10;

FIG. 12 is a modification of the second embodiment;
The perspective view showing the airbag of FIG.

FIG. 13 is a fifth embodiment which is a modification of the third embodiment;
The perspective view showing the airbag of FIG.

FIG. 14 is a perspective view showing an airbag according to a fifth embodiment which is a modification of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Airbag main body 10a, 10b Base cloth 20 Inner bag (restriction member) 30 Attachment part 40 Reinforcement cloth (reinforcement part) 50 Folded part (reinforcement part)

Claims (2)

[Claims] 1. An airbag having a regulating member for regulating a flow direction of gas from an inflator inside an airbag body, wherein the regulating member is integrally extended from a base cloth constituting the airbag body. The airbag is formed by folding the folded portion into the airbag body in a bag state, and the portion overlapped by the folding forms an attachment portion for the inflator. 2. The airbag according to claim 1, wherein a reinforcing portion is formed on the inner and outer peripheries of the mounting portion for the inflator.