JP3353463B2 - Airbag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag which protects an occupant by being deployed by gas ejected from an inflator provided at a rear part of the vehicle when a vehicle collides.

[0002]

2. Description of the Related Art When a vehicle collides with an airbag, the airbag passes through an opening provided in a rear portion of the airbag, and is used as an inflator (gas generator).
And protects the occupant by deploying the gas.

[0003]

In such an airbag, when an occupant enters the deployed airbag, gas inside the airbag flows out of a vent hole provided in the airbag. Thereby, the shock received by the occupant is absorbed.

[0004] It is an object of the present invention to provide an airbag that can sufficiently reduce the impact received by an occupant when the occupant enters the deployed airbag.

[0005]

An airbag according to the present invention comprises:
In an occupant protection airbag which is deployed by a gas introduced from an opening provided at a rear portion, side surfaces of the airbag are connected by a connecting means, and the connecting means reduces a gas pressure in the airbag. The side surfaces are connected to each other until a predetermined pressure is reached, the distance between the side surfaces is made smaller than the distance between the side surfaces in the maximum deployment state of the airbag, and the gas pressure in the airbag is lower than the predetermined pressure. When the distance becomes large, the distance is made longer than before.

In the airbag according to the first aspect of the present invention, the connecting means connects the side faces together, and a middle portion is folded back and overlapped with the string-like body. It was has been sutured part comrades, et you expand
When the occupant thrusts into the bag, when the gas pressure in the airbag becomes equal to or higher than the predetermined pressure, a suture is cut by the tension applied to the cord.

According to a second aspect of the present invention, in the above structure, the connecting means connects the side faces together, and a middle portion is folded back and overlapped with the string-like body. and it has joined the partial comrades, et you expand
When the occupant thrusts into the abag, when the gas pressure in the airbag becomes equal to or higher than the predetermined pressure, the adhesive is released by a tension applied to the cord-like body, and the adhesive is released. I do.

In the airbag according to a third aspect of the present invention, in the above configuration, the connecting means allows an occupant to poke into the deployed airbag.
As a result, when the gas pressure in the airbag becomes equal to or higher than the predetermined pressure , a texture extending in the length direction is added.
The tape is a tape made of a fabric obliquely crossed in the longitudinal direction, that is, a bias tape .

[0009]

When the inflator is actuated to deploy the airbag, the airbag is first deployed in front of the occupant so that it is large enough to protect the occupant. In the airbag of the present invention, the degree of deployment of the airbag at this time is such that the distance between the side surfaces of the airbag is reduced to some extent by the connecting means until the occupant comes in.

When the occupant enters the deployed airbag, the internal pressure of the airbag increases, and the side surfaces of the airbag are pressed in a direction away from each other. In the airbag according to the present invention , the occupant enters the deployed airbag.
When the internal pressure of the airbag becomes equal to or higher than the predetermined pressure, the connecting means allows the side surfaces of the airbag to move in the direction away from each other.

That is, in the airbag of the first aspect, the connecting means stitches a string-like body whose middle part is folded back and overlapped with each other and overlaps the string-like body with each other and is deployed. The occupant plunges into the airbag
Thus , when the gas pressure in the airbag becomes equal to or higher than a predetermined pressure, the string is cut by the tension applied to the string, and the string is kept until the occupant thrusts into the deployed airbag. It is in a taut state. If the occupant pushes in and the pressure in the airbag rises above a predetermined pressure, the suture breaks, the overlapped portion of the cord extends, the cord becomes longer, and the sides of the airbag separate from each other. Move in the direction. When the suture breaks, the collision energy of the occupant is absorbed and the impact on the occupant is reduced.

In the airbag according to the second aspect, the connecting means for connecting the side faces of the airbag is configured to join the string-like body whose middle part is folded back and overlapped, and the overlapped part of the string-like body. Occupants in the deployed airbags
When the gas pressure in the airbag becomes equal to or higher than a predetermined pressure, the occupant thrusts into the deployed airbag. The string is in a taut state until it comes out. When the occupant pushes in and the pressure in the airbag becomes equal to or higher than a predetermined pressure, the bonding by the adhesive is released, the overlapped portion of the cord-like body extends, the cord-like body becomes longer, and the side surface of the airbag becomes longer. Move away from each other. When the bonding by the adhesive is released, the collision energy of the occupant is absorbed, and the impact given to the occupant is reduced.

[0013] In the airbag according to the third aspect, the connecting means for connecting the side surfaces of the airbag is connected to the deployed airbag.
A bias tape that extends in the lengthwise direction when the gas pressure in the airbag rises above a predetermined pressure due to the occupant's intrusion. The body is in a taut state. When the occupant enters and the pressure in the airbag becomes equal to or higher than a predetermined pressure, the bias tape expands to increase the length, and the side surfaces of the airbag move in directions away from each other. When the bias tape is stretched, the collision energy of the occupant is absorbed, and the impact given to the occupant is reduced.

[0014]

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

FIG. 1 is a perspective view of an airbag 1 for a passenger seat showing one embodiment of an airbag according to claim 1 of the present invention, FIG. 2 is a cross-sectional view taken along the-line of FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing a cross section in the thickness direction of the cord 7, FIG. 4 is a cross-sectional view showing a maximum deployment of the airbag 1, and FIG. is there.

The passenger airbag 1 has an opening 2 at a rear portion thereof for receiving gas from an inflator (not shown). The airbag 1 is made of cloth, and a flap portion 3 is provided in a peripheral portion of the opening 2 by impregnating a synthetic resin or by sewing a reinforcing cloth. The flap portion 3 is provided with a plurality of bolt or rivet insertion holes 4, and the bolts or rivets enable the airbag 1 to be connected to a container (not shown) of the airbag device.

The side surface (side panel) of the airbag 1
On the inner surface of 5,6, strings 7,8 connecting side 5,6
Are connected. The strings 7 and 8 are folded back and overlapped in the vicinity of the center position in the length direction, and the overlapped portions (hereinafter referred to as “overlap portions”) 7A and 8A are sewn with a thread 9. I have. In this embodiment, the strings 7 and 8 are connected to both ends 7a and 7a.
b, 8a, 8b are attached by suturing to the side surfaces 5, 6, respectively.

The suture thread 9 for suturing the overlapping portions 7A, 8A has a strength such that when the gas pressure in the airbag 1 exceeds a predetermined pressure, it is cut by the tension applied to the strings 7, 8. .

The overlapping portions 7A, the length _{L 1} of the previous string 7,8 yarn 9 of 8A expires, than the distance between the side surfaces 5 and 6 in the maximum unfolded state of the airbag 1 _{L 2} (FIG. 4) Is also small.

In the airbag constructed as described above, when the gas is introduced by operating the inflator, the airbag 1 is connected to the strings 7, 8 having the overlapping portions 7A, 8A.
There was expanded to a state of the second view taut, the distance between the side surfaces 5 and 6 comrades of the airbag 1 becomes L _1. Note that the state shown in FIG. 2 may be referred to as a “first deployed state”.

When the occupant enters and the pressure in the airbag 1 exceeds a predetermined pressure, the thread 9 is cut, and the overlapping portions 7A and 8A of the strings 7 and 8 extend to extend the string. 7,8 is increased, the side surface 5, 6 of the airbag 1 as shown in FIG. 4 is moved in the mutually separating direction, the airbag 1 is such that the distance between the side surfaces 5, 6 can be further increased L ₂ (Hereinafter referred to as a “second deployed state”). When the suture thread 9 breaks and shifts from the first deployed state to the second deployed state, the collision energy of the occupant is absorbed, and the impact given to the occupant is reduced.

In the airbag according to the first aspect, there is no particular limitation on the method of suturing the overlapped portion of the string-like body, and the stitch is also used for the seam as shown in FIGS. 3 and 5 (a). The seam 11 is provided on the overlapping portion 10A in the width direction orthogonal to the length direction of the cord-shaped body 10, and as shown in FIG. As shown in FIG. 5 (c), the stitch 11 is provided in a direction oblique to the length direction of the cord-shaped body 10, as shown in FIG. 5 (c). The one provided with the stitches 11 in a lattice shape, the one provided with the stitches 11 in an oblique lattice shape as shown in FIG.

Also, there is no particular limitation on the number of folded portions of the overlapping portion of the string-like body. As shown in FIG. 3, the string 7 is folded twice to form a three-fold overlapping portion 7A. As shown in FIG.
To form a loop-shaped portion 12A.

An airbag according to a second aspect is different from the first aspect in that the overlapping portion of the cord-like body is joined with an adhesive instead of a suture, and the other configuration is the same.

FIG. 7 is an enlarged sectional view showing a sectional view in the thickness direction of the overlapping portion of the cord-like body according to the second aspect of the present invention. As shown in the drawing, in the airbag according to the second aspect, the overlapping portions 14A of the strings 14 connecting the side surfaces are joined with an adhesive 15.

The overlapping portion 14A using the adhesive 15
By adjusting the type of adhesive and the amount of application, the occupant can pierce as in the case of the suture in claim 1
Then , when the pressure in the airbag becomes equal to or higher than a predetermined pressure, the joining is released by the tension applied to the string-like body 14.

Also in the airbag of the second aspect, when the occupant comes in after the airbag is deployed to the first deployed state, the bonding by the adhesive 15 is released, and the overlapping portion 14A of the cord-like body 14A is released. When the cord 14 is elongated and the string-like body 14 is lengthened to shift to the second deployed state, the collision energy of the occupant can be absorbed and the impact given to the occupant can be reduced.

In the airbag according to the third aspect, as the connecting means of the side surfaces of the airbag, a bias tape 16 having a length shorter than the distance between the side surfaces in the maximum deployment state of the airbag as shown in FIG. Is used. The bias tape is a tape made of a woven fabric in which weaves are obliquely arranged in the longitudinal direction of the tape.

The bias tape 16 first expands the airbag to a first deployed state, and then, when an occupant enters and the gas pressure in the airbag exceeds a predetermined pressure, the bias tape 16 expands. It extends and lengthens, causing the airbag to deploy to a second deployed state. Then, when shifting from the first deployed state to the second deployed state, the collision energy of the occupant is absorbed and the impact given to the occupant is reduced.

Although the illustrated embodiment shows an example in which the airbag of the present invention is applied to an airbag for a passenger seat, the airbag of the present invention is not limited to an airbag for a passenger seat, but is applied to an airbag for a rear seat. Is also applicable.

[0031]

As described in detail above, according to the first to third aspects of the present invention, there is provided an airbag which has a high effect of absorbing the collision energy of the occupant and can further reduce the impact applied to the occupant. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a passenger airbag according to an embodiment of the airbag of the present invention.

FIG. 2 is a cross-sectional view taken along line-of FIG.

FIG. 3 is an enlarged sectional view of a main part of the string in FIGS.

FIG. 4 is a cross-sectional view showing a maximum deployed state of the airbag shown in FIGS.

FIG. 5 is a plan view showing an example of a seam at a superposed portion of the string-shaped body.

FIG. 6 is an enlarged perspective view of a main part showing another embodiment of a method of superposing a superposed portion of a string-shaped body.

FIG. 7 is an enlarged cross-sectional view showing an overlapped portion of a cord-like body in the airbag according to claim 2;

FIG. 8 is a perspective view showing a bias tape used in the airbag of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airbag for a passenger's seat 2 Opening 3 Flap part 5,6 Side surface 7,8 String 7A, 8A Lamination part 9 Thread 15 Adhesive 16 Bias tape

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (3)

(57) [Claims] An occupant protection airbag which is deployed by a gas introduced from an opening provided in a rear portion,
The side faces of the airbag are connected by a connecting means, and the connecting means connects the side faces until the gas pressure in the airbag reaches a predetermined pressure, and determines the distance between the side faces by the airbag. And when the gas pressure in the airbag becomes larger than the predetermined pressure, the distance is made larger than before. there, the said connecting means is connected to said side each other, and string-like body superimposed folded back in the middle portion, has been sutured superimposed portions comrade of string-like body, Exhibition
As the occupant plunges into the opened airbag,
An airbag comprising: a suture that is cut by a tension applied to the cord when the gas pressure in the airbag becomes equal to or higher than the predetermined pressure. 2. An occupant protection airbag which is deployed by a gas introduced from an opening provided in a rear portion,
The side faces of the airbag are connected by a connecting means, and the connecting means connects the side faces until the gas pressure in the airbag reaches a predetermined pressure, and determines the distance between the side faces by the airbag. And when the gas pressure in the airbag becomes larger than the predetermined pressure, the distance is made larger than before. there, the said connection means, the side and connecting the comrades, have been joined with a string-like body superimposed folded back in the middle portion, a portion comrades superimposed a string-like body, Exhibition
As the occupant plunges into the opened airbag,
An airbag, comprising: an adhesive which is released when the gas pressure in the airbag becomes equal to or higher than the predetermined pressure, by a tension applied to the string-shaped body. 3. An occupant protection airbag which is deployed by a gas introduced from an opening provided in a rear part,
The side faces of the airbag are connected by a connecting means, and the connecting means connects the side faces until the gas pressure in the airbag reaches a predetermined pressure, and determines the distance between the side faces by the airbag. And when the gas pressure in the airbag becomes larger than the predetermined pressure, the distance is made larger than before. The connecting means is provided when an occupant thrusts into the deployed airbag.
When the gas pressure in the airbag becomes equal to or higher than the predetermined pressure , the texture extends in the length direction.
An airbag comprising a tape made of a fabric obliquely crossed in a hand direction .