JPH04243645A - Air bag device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is placed in front of the seat of various vehicles including automobiles, and inflates and deploys the bag body in the event of a vehicle collision, restraining the occupant and causing a secondary collision. The present invention relates to an airbag device that prevents.

0002

2. Description of the Related Art As is well known, an airbag device operates an inflator based on the sensing action of a collision sensor when a vehicle collides, etc., and inflates the bag body with the gas generated from the inflator. It deploys rapidly to restrain occupants who are moving forward due to inertia in the event of a collision.

By the way, in such an airbag device, as shown in Japanese Patent Laid-Open No. 64-52554, for example, a bag base fabric on the inflator side and a cover side, which constitute a bag-like bag body, are used. It is known that a plurality of straps are attached across each inner surface of the bag base fabric, and these straps restrict the expansion and deployment of the bag body.

0004

[Problem to be solved by the invention] The strap restricts the expansion and deployment of the bag body, especially the expansion in the front and rear directions, so that the occupant can be received over a wide area, but the optimal form of restraint for the occupant can be obtained. For this purpose, it is considered desirable to be able to control the deployment speed of the bag body.

SUMMARY OF THE INVENTION Therefore, the present invention provides an airbag device that can control the deployment speed of the bag body and the final deployed shape of the bag body, thereby providing an optimal occupant restraint configuration.

[0006]

[Means for solving the problem] Between the bag base fabric on the inflator side, in which the periphery of the inflator mounting hole is sealed to the inflator, and the bag base fabric on the cover side, which is connected to the bag base fabric on the inflator side. In a structure including a bag body to which a plurality of straps are attached across the bag body, a folded part is formed in the middle part of the strap and is fixed to the bag body so that it can be peeled off with a required tension when the bag body is inflated.

[0007]

[Operation] When the inflator operates and the bag body inflates and unfolds, the strap temporarily restricts its expansion, but by applying the required tension to the strap, the adhesiveness of the folded part is peeled off and the bag is returned to the bag. The main body inflates and unfolds, and the unfolding speed is controlled by the bag main body unfolding in multiple stages, and the length of the strap restricts the forward and backward unfolding of the bag body, resulting in the final unfolded shape of the bag main body. is controlled.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an airbag unit that is disposed on a member in front of the seat, such as the instrument panel or the center of the steering wheel (not shown), and is based on the detection action of a high-sensitivity collision sensor 2. It includes an operating inflator 3 and a bag-like bag body 4 that is folded and stored over the inflator 3.

The bag body 4 is formed into a bag shape by overlapping and sewing together the bag base fabric 5 on the inflator side and the bag base fabric 6 on the cover side. The periphery of the inflator mounting hole 7 formed in the center is fixed to the periphery flange 3a of the inflator 3 with bolts and nuts 9 and sealed.

A plurality of straps 8 are attached to the bag base fabric 5 on the inflator side and the bag base fabric 6 on the cover side so as to span between their inner surfaces. Specifically, one end of the strap 8 is firmly sewn to the peripheral edge of the inflator attachment hole 7 of the bag base fabric 5 on the inflator side, and the strap 8 is fixed together with the peripheral edge to the flange 3a with bolts and nuts 9. , and the other end of the strap 8 is firmly sewn to the center portion of the bag base fabric 6 on the cover side so that it will not come off due to internal pressure when the bag body is inflated.

[0012] The basic structure described above is almost the same as the conventional structure, but here, each strap 8 has a strap in the middle thereof that can be peeled off with a required tension when the bag main body 4 is inflated. A fixed folded portion 8a is formed. In this embodiment, one part of the middle part of each strap 8 is folded back,
Although the folded portions are fixed by appropriate means, it goes without saying that each strap 8 may be provided with a plurality of folded portions 8a depending on the requirements for controlling the unfolding speed of the bag body 4, and the peel strength of each folded portion 8a may be may be made to be different.

[0013] As a means of fixing the folded portion 8a, this embodiment shows a case of sewing, but this may also be done by adhesion with an adhesive or by fusing if the strap 8 is made of a resin fiber blend. The method can be selectively carried out as appropriate.

According to the apparatus of the above embodiment, when the inflator 3 is activated and generates gas based on the detection action of the collision sensor 2 during a vehicle collision, the bag body 4 is rapidly inflated by the generated gas. expand.

During the rapid inflation and deployment process of the bag body 4, the strap 8 having the folded portion 8a formed in the middle portion at the initial stage of expansion of the bag body 4 prevents the bag body 4 from being deployed as shown by the solid line in FIG. However, when the tension acting on the strap 8 reaches a predetermined value or more as the internal pressure of the bag increases, the fixation of the folded portion 8a peels off, and the bag body 4 is released from its expansion restriction. Then it expands and expands again.

The expansion of the bag body 4 is ultimately regulated by the length of the strap 8, and as shown by the chain line in FIG.
It will be able to catch passengers moving inertially forward.

In this way, the bag body 4 is inflated and deployed in multiple stages, and the deployment speed is controlled, so that the timing for restraining the occupant can be well-balanced. The unfolded shape can be controlled so that the side surface on the passenger side is nearly flat, and the passenger can be restrained reliably.

[0018]

[Effects of the Invention] As described above, according to the present invention, due to the presence of the folded part formed in the middle part of the strap, the bag body can be inflated and deployed in multiple stages to appropriately control the deployment speed, and the strap can be expanded and deployed in multiple stages. This has a great practical effect in that the final unfolded shape of the bag body can be controlled, the optimal occupant restraint form can be obtained, and the occupant protection function can be further enhanced.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the present invention.

[Explanation of symbols]

1... Airbag unit, 3... Inflator, 4... Bag body, 5... Bag base fabric on the inflator side, 6... Bag base fabric on the cover side, 7... Inflator mounting hole, 8... Strap, 8a... Folded part

Claims (1)

[Claims] Claim 1: A plurality of inflator-side bag base fabrics with the periphery of the inflator mounting hole sealed to the inflator, and a bag base fabric on the cover side that is connected to the inflator-side bag base fabric. An airbag device having a structure comprising a bag body to which a strap is attached, characterized in that a folded part is formed in the middle part of the strap so that it can be peeled off with a required tension when the bag body is inflated.