JPH08104195A - Air bag for vehicle - Google Patents

Abstract

PURPOSE: To reduce the tension applied on a strap and reduce the required strength of the strap, as for an air bag having the strap for regulating the development shape is installed inside. CONSTITUTION: An inside cloth 5 for controlling the flow of the inflator gas is attached onto the inner surface of an air bag so as to cover the opened port part 4 of an inflator side cloth 1, and the outer peripheral edge part of the inside cloth 5 is partially seamed with the inflator side cloth 1, and in the region ranging from the seamed part 6a or the outer peripheral part to the opposed driver side cloth 2, the inflator side cloth 1 and the driver side cloth 2 are connected in a specific length, and a strap 7 for regulating the development shape of the air bag is installed.

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.

[0002]

2. Description of the Related Art An airbag device is a device that protects an occupant by inflating the airbag in the event of a vehicle collision.
It is provided with an inflator which is a gas generator and an airbag which is inflated by the gas of the inflator.

In the case of a driver's seat or the like, the outer shape of the air bag is formed by sewing the outer peripheral edge portions of the inflator side cloth and the passenger side cloth together. In order to obtain the deployed shape of the airbag, a strap is provided inside the airbag-side cloth and the inflator-side cloth, which are connected with a predetermined length to limit deformation when the airbag is deployed. .

Since the cloth on the occupant side is directly subjected to the gas pressure of the inflator, the strap is subjected to a strong tensile force when the airbag is deployed. Therefore, the material, thickness, width and the like are taken into consideration so as to have sufficient strength. Has been done.

[0005]

However, with the miniaturization of the airbag device, the above strap is one of the factors that make the folded airbag bulky, and some improvement is required for this. Has been.

The present invention copes with the above situation and reduces the tension acting on the strap when the airbag is deployed by using an inner cloth for controlling the flow of the inflator gas, thereby simplifying the strap. The purpose is.

[0007]

That is, the feature of the vehicle airbag of the present invention which meets the above-mentioned object is that the outer peripheral portion of the inflator side cloth and the passenger side cloth are sewn together to form the outer shape of the airbag as described above. On the other hand, in an airbag in which the opening for attaching the inflator is formed in the inflator side cloth, so as to cover the opening of the inflator side cloth,
An inner cloth for controlling the flow of the inflator gas is attached to the inner surface of the airbag, and the outer peripheral edge portion of the inner cloth is partially sewn to the inflator side cloth, and the sewn portion or its outer peripheral portion or inner peripheral portion faces each other. The cloth on the passenger side,
The inflator side cloth and the occupant side cloth are connected to each other with a predetermined length, and a strap for restricting the deployment shape of the airbag is attached.

Further, in the above airbag of the present invention,
It is also possible to configure the strap by integrally extending from the inner cloth, reduce the number of sewing steps, and simplify the manufacturing process of the airbag.

[0009]

In the air bag of the present invention, the gas ejected from the inflator flows radially by hitting the inner cloth and reaches the outer peripheral portion of the air bag through the sewn portions of the inner cloth. Moreover, since the occupant side cloth does not directly receive the inflator gas as in the conventional case, the tension on the strap is significantly reduced.

Therefore, as the strength of the strap,
It is sufficient to consider only the internal pressure of the airbag, and the thickness and thickness of the strap or the quantity can be reduced.
It is also possible to use an inexpensive material that is not as strong as before.

[0011]

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

FIG. 1 is a sectional view showing an inflated state of an airbag of the present invention, FIG. 2 is a plan view of an inflator side cloth of the same embodiment, and FIG. 1 is a sectional view taken along line AA of FIG. There is.
As shown in FIG. 1, this airbag has the outer shape of the airbag formed by stitching the outer peripheral edge portions of the inflator side cloth 1 and the passenger side cloth 2. As shown in FIG. An opening 4 into which the head portion 3a of the inflator 3 is inserted is formed at approximately the center of the cloth 1. Then, as shown in FIG. 2, an inner cloth 5 for controlling the flow of the inflator gas is attached to the inner surface of the airbag so as to cover the opening 4.

In this embodiment, as shown in FIG. 2, the outer peripheral edge portion of the inner cloth 5 is partially sewn to the inflator side cloth 1 by a sewing 6 at about 1/4 at opposite positions. Two straps 7 formed integrally with the inner cloth 5 are extended from the outer peripheral portion of the sewn portion 6a. As shown in FIG. 1, these straps 7 are sewn to the occupant-side cloth 2 at the portion facing the extended position, and the distal end portions 7a are sewn to each other, and the inflator-side cloth 1 and the occupant-side cloth 2 are predetermined. The lengths of the air bags are connected to each other and the expanded shape of the airbag is regulated so as to have a flat shape as shown in FIG.

The strap 7 can be formed separately from the inner cloth 5, and in this case, the sewing 6 can be sewn to the inflator side cloth 1 together with the inner cloth 5. When other sewing is performed, the inner peripheral portion of the sewn portion 6a is directly sewn to the inflator side cloth 1, while the inner peripheral portion of the sewn portion 6a is sewn to the inner cloth 5. Inflator side cloth 1 through cloth 5
It is also possible to attach it to.

Further, the number and arrangement of the straps 7,
Alternatively, the number, length, arrangement, etc. of the sutured portions 6a of the inner cloth 5 can be appropriately selected as necessary.

In the air bag of the embodiment of the present invention, however, as shown in FIG. 1, the gas ejected from the inflator 3 hits the inner cloth 5 to flow radially, and the inner cloth 5 is sewn between the sewing 6 pieces. To reach the outer peripheral portion of the airbag. As a result, the airbag starts to deploy from this outer peripheral portion, and the strap 7
It is possible to obtain a shape close to the completion of expansion at an early stage in combination with the action of.

On the other hand, in the occupant-side cloth 2, since the gas of the inflator 3 is radially dispersed as described above and does not directly receive the gas flow as in the conventional case, the strap 7 connected to the occupant-side cloth 2 is connected. Tension is also greatly reduced. Therefore, as the strength of the strap 7, it is sufficient to consider only the internal pressure of the airbag as a whole, and the thickness, thickness, or quantity of the strap 7 can be reduced, and an inexpensive material which is not as strong as the conventional one can be used. This is possible and effective in reducing the size and cost of the airbag device.

[0018]

As described above, in the vehicle airbag of the present invention, the inflator gas flow control inner cloth is attached to the inner surface of the airbag so as to cover the inflator mounting opening of the inflator side cloth. The outer peripheral edge of the inner cloth is partially sewn to the inflator-side cloth, and the inflator-side cloth and the occupant-side cloth are stretched to a predetermined length by extending from the sewn portion or the outer peripheral portion thereof to the opposing passenger-side cloth. The strap is attached to regulate the deployment shape of the airbag by connecting the straps with each other.The inflator gas flows radially when it hits the inner cloth, and the passenger side cloth does not receive the inflator gas directly. Significantly reduces the tension on the strap, reduces the thickness and thickness of the strap, or reduces the number of straps, and also enables the use of inexpensive materials. It is intended to achieve.

[Brief description of drawings]

FIG. 1 is a 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 of the same embodiment.

[Explanation of symbols]

 1 inflator side cloth 2 occupant side cloth 3 inflator 3a inflator head 4 opening 5 inner cloth 6 sewing 6a seam 7 strap 7a strap tip

Claims (2)

[Claims] 1. An air bag for a vehicle, wherein outer peripheral edges of an inflator side cloth and an occupant side cloth are sewn together to form an outer shape of an airbag, and an opening for mounting an inflator is formed on the inflator side cloth. , So as to cover the opening of the inflator side cloth, an inner cloth for controlling the flow of the inflator gas is attached to the inner surface of the airbag, and the outer peripheral edge portion of the inner cloth is partially sewn to the inflator side cloth,
A strap for connecting the inflator-side cloth and the passenger-side cloth with a predetermined length is provided so as to extend from the sewn portion or its outer peripheral portion or inner peripheral portion to the opposing occupant-side cloth, and a strap for restricting the deployment shape of the airbag is attached. A vehicle airbag characterized by being worn. 2. The vehicle airbag according to claim 1, wherein the strap is integrally extended from the inner cloth.