JPH0725303A - Air bag device - Google Patents

Abstract

PURPOSE:To realize the rapid expansion and development of a bag body into appropriate shape without causing the enlargement of inflators. CONSTITUTION:An inner bag 6 formed of a collecting part 7 including inflators 2 and four branch parts 8 along four upper and lower corner parts of a bag body 3 is formed inside the bag body 3, and a supply/exhaust hole 9 communicated with the outside is formed at the side wall part 3b of the bag body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device arranged on a steering wheel of an automobile or a passenger seat side of an instrument panel.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Utility Model Laid-Open No. 63-123354, an automobile air bag system inflates a bag body that contains and folds an inflator by the gas pressure generated from the inflator. The occupant is deployed and restrained to protect the occupant from a secondary collision.

[0003]

In order to protect an occupant in the event of a vehicle collision, it is necessary to quickly inflate and deploy the above-mentioned bag main body into an appropriate shape, but the bag main body can surely restrain the occupant. The volume is quite large, and it takes time from the actuation of the inflator to the expansion and expansion of the bag body.

Therefore, although the gas generation amount of the inflator is large, the size of the inflator is naturally limited due to the balance of the mounting space, and as a result, the bag body does not inflate and expand into a proper shape when the vehicle collides. The occupant may inertially move forward.

Further, the bag body is provided with an exhaust hole for reducing the reaction force when restraining the occupant so that the gas inside the bag body is released to the outside of the bag body by the pressure when restraining the occupant. There is also a problem that harmful gas is released into the passenger compartment.

Therefore, according to the present invention, it is possible to quickly inflate and deploy the bag main body without increasing the size of the inflator due to the increase in the amount of gas generated by the inflator, and to avoid the outflow of the generated gas. An airbag device that can be used is provided.

[0007]

[Means for Solving the Problems] Inside a bag body, a collecting portion that contains an inflator, and a plurality of branch portions that branch from the collecting portion and face the rear surface of the bag body along the inner surface of the bag body. An inner bag for shape retention is formed, and a supply / exhaust hole communicating with the outside is formed in the bag body.

[0008]

When the inflator is actuated to generate gas, the generated gas flows through the collecting portion of the inner bag into a plurality of branch portions branched from the collecting portion to rapidly inflate the inner bag, Unfold and unfold the bag body.

At this time, at the same time when the inner bag is inflated and deployed, air in the vehicle compartment is sucked into the bag body through the air supply and exhaust holes, and the inner bag is inflated and deployed and the bag body is quickly inflated into a proper shape. Deploy.

When the occupant that inertially moves is received and restrained by the bag body, the pressure at that time supplies the air sucked into the bag body and escapes it from the exhaust hole into the passenger compartment to reduce the reaction force when the occupant is restrained.

[0011]

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

1 to 4, reference numeral 1 denotes a base plate on which an inflator 2 is mounted. The inflator 2 is surrounded by the base plate, and an opening peripheral part of a bag body 3 is fixed with a bolt and nut 5 via a retainer 4. .

In this embodiment, the bag body 3 has a peripheral wall portion 3a.
And side walls 3b sewn on both sides of the peripheral wall 3a, and an inner bag 6 for shape retention is formed inside the bag body 3.

The inner bag 6 is formed by being sewn on the inner surface of the bag body 3, and includes a collecting portion 7 that encloses the inflator 2 and separates the inflator 2 and the inside of the bag body 3 from each other. It is branched from the portion 7 and is composed of four branch portions 8 which are directed to the rear surface side of the bag body 3 along the sewn corners of the peripheral wall portion 3a and the side wall portion 3b on the inner surface of the bag body 3. .

A supply / exhaust hole 9 having an appropriate area is formed on one side wall portion 3b of the bag body 3 so as to communicate with the outside.

Reference numeral 10 denotes a strap for restricting the expansion of the collecting portion 7 of the inner bag 6.

According to the structure of the above embodiment, when the inflator 2 is actuated by the action of the collision sensor (not shown) to generate gas at the time of vehicle collision, the generated gas passes through the collecting portion 7 of the inner bag 6. 4 branched from the gathering part
It flows into the branch portion 8 of the strip, and the inner bag 6 is rapidly inflated and expanded to expand the bag body 3.

At this time, the inner bag 6 is inflated,
Simultaneously with the expansion, the air in the vehicle compartment is sucked into the bag body 3 through the air supply / exhaust holes 9 formed in the side wall portion 3b thereof, and the inner bag 6 is inflated and unfolded to move the bag body 3 into
The corner is used as an air column to inflate and expand into a proper shape.

Here, the inner bag 6 is composed of the collecting portion 7 and the four branch portions 8 as described above, and the volume thereof is significantly smaller than the volume of the bag body 3, so that gas is generated from the inflator 2. The bag body 3 is inflated and expanded in a very short time, and the air is sucked into the bag body 3 through the air supply / exhaust holes 9 as described above, so that the bag body 3 can be smoothly expanded and deployed. , Can be done rapidly.

On the other hand, as described above, the bag body 3 is rapidly inflated and expanded into a proper shape, so that the occupant moving forward due to inertia is reliably received and restrained by the bag body 3 and the occupant is prevented from a secondary collision. At this time, the air sucked into the bag body 3 due to the pressure when the occupant is restrained escapes from the air supply / exhaust holes 9 into the passenger compartment to reduce the reaction force.

[0021]

As described above, according to the present invention, an inner bag for shape retention is formed inside the bag body, and when the inflator is actuated, the gas generated from the collecting portion of the inner bag is divided into a plurality of branch portions. The inner bag, which has a volume significantly smaller than that of the bag body, is inflated and deployed first, so that the bag body can be rapidly inflated and deployed into an appropriate shape, so that the occupant is securely restrained. The safety can be further improved.

Moreover, the generated gas remains in the inner bag, the bag body is supplied, and the air inside the vehicle is supplied through the exhaust hole.
Since it is only exhausted, harmful gas can be prevented from flowing out into the passenger compartment.

Furthermore, since the generated gas is caused to flow into the inner bag having a small volume, and the outside air is sucked into the bag main body to be inflated by expanding from the exhaust hole, the amount of generated gas can be reduced, so that the inflator can be reduced. Can be downsized, and the downsizing of the entire airbag unit can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory side view of the same embodiment.

3 is a sectional view taken along the line AA of FIG.

4 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

 2 ... Inflator 3 ... Bag body 6 ... Inner bag 7 ... Collecting part 8 ... Branch part 9 ... Supply / exhaust holes

Claims (1)

[Claims] 1. A retainer comprising, inside the bag body, a collecting portion for containing an inflator, and a plurality of branch portions branching from the collecting portion and directed toward a rear surface side of the bag body along an inner surface of the bag body. An air bag device, characterized in that a shape inner bag is formed, and a supply / exhaust hole communicating with the outside is formed in the bag body.