JPH0832511B2 - Airbag device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airbag device for protecting an occupant in the event of a collision of a vehicle or the like, and more specifically, a base plate attached to a fixed side and the base plate. The present invention relates to an airbag device including a gas generator fixedly attached to an air bag, and an airbag body mounted so as to bulge when the gas generator operates.

[Conventional technology]

BACKGROUND ART Conventionally, an airbag device has been known as a protection device for passengers of a vehicle or the like. As this airbag device, Japanese Patent Publication No. 56-43890, Japanese Utility Model Publication No. 51-44517 and Japanese Utility Model Publication No.
There is a publication such as 61-185642.

As an airbag device, a gas generator is fixed to a base plate attached to a fixed side such as an instrument panel or a steering wheel, and an airbag body having a gas inlet is fixed to the base plate via a retainer under predetermined conditions. When the gas generator is activated under the condition, the gas instantaneously flows into the airbag main body and the airbag main body is instantaneously inflated.

Further, in order to prevent the gas from the gas generator from flowing into the central portion on the tip side of the airbag body and bulging the airbag body toward the occupant side in substantially one direction, a suspension belt is provided, The shape is regulated.

In addition, in Japanese Utility Model Publication No. 51-44517, a bent portion having a convex cross-section is formed over the entire circumferential surface of the airbag body, and the bent portion is appropriately broken at the time of rapid deployment of the airbag body. It is shown that a plurality of rows of folds are formed by sewing with a sewing thread that is held.

[Problems to be Solved by the Invention]

However, when attaching a suspension belt to a conventional airbag body, there is a risk that the end portion of the suspension belt will be attached irregularly, and it will take time and effort to manufacture and sew the suspension belt, which is not economical. It was a thing. Further, when the suspension belt is not used, there is a possibility that the central portion of the front end side of the airbag body may directly hit the occupant's face or chest.

Further, the airbag disclosed in Japanese Utility Model Publication No. 51-44517 has a bent portion formed over the entire circumferential surface of the airbag body and is sewn, which increases the number of work steps and the strength of the sewing thread. Of the airbag body becomes unstable due to the unevenness of the airbag and the uneven shape of the bent portion.For example, the strength of the sewing thread may differ between the upper surface side and the lower surface side of the airbag body, If the shape of the part is different, the airbag body does not bulge evenly forward, deploys with an upward or downward bias, and hits the occupant's face directly, or the airbag body has a sufficient holding function. There is a risk that it will not work.

The object of the present invention is to eliminate the need to attach a hanging belt to the airbag body, to easily and quickly sew the airbag body, and the center portion on the tip side of the airbag body directly hits the occupant's face and chest. It is an object of the present invention to provide an airbag device which has no fear, is excellent in safety, can reduce the number of parts, and is extremely economical.

[Means for solving the problem]

The present invention has been made in view of the above-mentioned problems, and includes a base plate attached to a fixed side, a gas generator fixed to the base plate, and an air bag attached so as to bulge due to the operation of the gas generator. In the airbag device including a main body, the airbag main body is formed with a sewn portion that extends in the front-rear direction in a state in which the center portion on the tip side is folded inward, and the sewn portion is sewn when the airbag main body is half-deployed The central portion of the airbag main body is prevented from bulging forward by the portion, and the sewing thread of the sewing portion extending in the front-rear direction is broken when the internal pressure of the airbag main body becomes a predetermined pressure or more, It is characterized in that the airbag main body is designed to be able to bulge into its original deployed state.

[Operation] According to the present invention, the central portion of the front end side of the airbag body is folded inward, and the sewn portion extending in the front-rear direction is formed in this folding portion, and the airbag body is semi-deployed. The sewn portion can prevent the central portion of the airbag main body from bulging forward, there is no risk of the airbag main body being directly hit on the occupant's face, and the internal pressure of the airbag main body is kept at a predetermined level. In the above case, the sewing thread of the sewn portion that extends in the front-rear direction is broken, and the airbag body can swell to the original deployed state, so that the occupant can be reliably held, and the front-rear direction The sewn thread of the sewn portion that is extended to the front is sequentially broken in the front-rear direction, and the airbag body is swollen forward smoothly.

〔Example〕

Hereinafter, an airbag device according to the present invention will be described in detail with reference to the drawings.

1 to 3 respectively show the outline of one embodiment of the airbag device according to the present invention.
In the present embodiment, the case where the fixed side to which the base plate 13 is attached is the instrument panel side is shown, but the steering side can also be the fixed side.

The airbag device 11 includes a gas generator 17 fixed to the base plate 13 by fixing means such as bolts and nuts, and an airbag body 19 having a gas inlet 21 into which gas from the gas generator 17 flows. There is. The airbag body 19 is formed by laminating a synthetic resin sheet on a cloth or the like.

A pair of left and right through holes 25 is formed in the substantially central portion of the base plate 13, and the front end sides of the pair of gas generators 17 project forward from the pair of through holes 25, and the gas outlet 17 of the gas generator 17 is formed.
a is inserted into the airbag body 19 through the gas inlet 21. The number of gas generators 17 may be one, or three or more.

The airbag body 19 has a central portion on the front end side folded inward to form a folding portion 31, and a pair of upper and lower folding portions 31 are formed. The center of the pair of upper and lower folding portions 31 is the front-back direction. A sewn portion 33 that is sewn along and extends in the front-rear direction is formed. The sewn portion 33 is not limited to the straight stitch, and may be sewn in a wave shape or zigzag stitch. Further, the sewn portion 33 is formed by one sewing thread 34, but the sewn portion 33 may be formed by using two sewing threads 34 at appropriate intervals. Further, the length of the sewn portion 33 extending in the front-rear direction can be appropriately changed.

Even in such a configuration, the gas generator of the airbag device 11
When 17 is operated under a predetermined condition such as a collision, gas is instantaneously supplied into the airbag body 19 from the gas outlet 17a, and the airbag body 19 is in a half-deployed state as shown in FIG. The airbag main body 19 bulges in a shape following the shape of the extending sewn portion 33, and therefore both side portions 19a avoiding the occupant's face bulge forward.

Next, when the internal pressure of the airbag body 19 exceeds a predetermined pressure, the sewing thread 34 of the sewing portion 33 extending in the front-rear direction is sequentially broken from the front, and the airbag body 19 is shown by an imaginary line in FIG. As described above, the bulge expands to its original shape and securely holds the occupant.

In the embodiment described above, a pair of upper and lower sewn portions 33 are formed in the center of the front end side of the airbag body 19, but a pair of sewn portions 33 are formed in the upper and lower portions at intervals in the left-right direction. However, it is possible to make various modifications and changes.

〔The invention's effect〕

The above is the configuration of one embodiment of the airbag device according to the present invention. According to such a configuration, the center portion of the airbag body on the front end side is folded inward, and the folded portion extends in the front-back direction. A sewn portion extending to the front side of the airbag body can be prevented from being bulged forward by the sewn portion when the airbag body is half-deployed. There is no danger of hitting directly, it is extremely safe, and when the internal pressure of the airbag body exceeds a predetermined pressure, the sewing thread of the sewing portion extending in the front-rear direction is broken, and the airbag body is originally The occupant can be securely held, and the sewing thread of the sewn portion extending in the front-rear direction is sequentially broken in the front-rear direction so that the bulge forward of the airbag body is smooth. The operation reliability can be improved and Ri it is not necessary to use a belt or the like can be reduced number of parts, it is possible to obtain an air bag device having excellent remarkably economical.

[Brief description of drawings]

1 to 3 respectively show an outline of one embodiment of an airbag device according to the present invention, and FIG. 1 is an exploded perspective view showing a bulging state of an airbag body when half-deployed, and FIG. FIG. 3 and FIG. 3 are a vertical sectional view and a horizontal sectional view. In the figure, 11 ... Airbag device, 13 ... Base plate,
17 ... Gas generator, 17a ... Gas outlet, 19 ... Air bag body, 21 ... Gas inlet, 25 ... Through hole, 31 ... Folding part, 33 ... Sewing part, 34 ... … Sewing thread.

Claims (1)

[Claims] 1. A base plate mounted on a fixed side,
In an airbag device including a gas generator fixed to the base plate and an airbag body attached so as to bulge due to the operation of the gas generator, the airbag body has a central portion on the tip side inward. A sewn portion that extends in the front-rear direction in a folded state is formed, and prevents the central portion of the airbag body from bulging forward by the sewn portion when the airbag body is half-deployed. When the internal pressure of the main body is equal to or higher than a predetermined pressure, the sewing thread of the sewing portion extending in the front-rear direction is broken, and the airbag main body can be expanded to its original deployed state. Airbag device to do.