JPH0635826Y2 - Vehicle airbag device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of an airbag device for a vehicle.

[Prior Art] Conventionally, it is mounted on a vehicle such as an automobile, and when a vehicle collides,
BACKGROUND ART An airbag device that protects an occupant by preventing the occupant from colliding with a windshield, a steering wheel, an instrument panel, or the like is generally well known.

In the above-mentioned airbag device, generally, at the time of a vehicle collision, an ignition device (igniter) is activated by an output signal from a collision detection sensor provided in a vehicle body, and a gas generator reacts a gas generating agent with a flame sensitizer. It instantly generates gas, and this gas inflates the airbag. Then, the gas in the airbag is exhausted to the outside after the airbag is deployed in order to absorb the collision energy of the occupant and adjust the pressure in the airbag (for example, the actual engine).
51-31468).

However, even in a vehicle equipped with the above-mentioned airbag device, especially when the occupant does not wear a seat belt and the behavior of the occupant at the time of a collision is not sufficiently restrained, the occupant's head or the like may be inflated. It is conceivable to move forward beyond the bag toward the windshield. It is also possible that the occupant once hits the airbag, then rebounds and moves forward again.However, as described above, the gas in the airbag is exhausted to the outside after deployment, so depending on the timing of the rebound. It may be possible that the internal pressure of the airbag is too low to sufficiently protect the occupant.

For such a case, in addition to the conventional airbag (first airbag) which is deployed toward the occupant, a second airbag which is deployed upward along the inner surface of the windshield is provided. It is considered that the two airbags protect the occupant more reliably.

[Problems to be solved by the invention] However, when two airbags are provided as described above,
These two airbags interfere with each other during deployment,
It is possible that its development will be hindered.

Further, in the second airbag, as in the case of the first airbag, the internal gas is exhausted to the outside after the deployment. Therefore, after the occupant collides with the first airbag, If you rebound and move forward again,
It is conceivable that the internal pressure of the airbag will drop too much to fully protect the occupant.

The present invention has been made in view of the above problems, and in an airbag device including an airbag that deploys toward an occupant and an airbag that deploys upward along an inner surface of a windshield, a vehicle collision occurs. At the same time, it is an object of the present invention to provide a vehicle airbag device that can deploy both airbags without hindering each other and reliably protect an occupant.

[Means for Solving the Problems] Therefore, according to the present invention, a collision detecting means for detecting a collision of a vehicle, a gas generating means which operates by receiving an output signal from the collision detecting means, and the gas generating means. A first airbag which is deployed toward the occupant by means, and a second airbag which is deployed above the first airbag by the gas generating means.
An air bag, a delay means for inflating the second air bag after deployment of the first air bag, and a gas for preventing gas in the second air bag from leaking to the outside after deployment of the second air bag. It is provided with a slip-out preventing means.

[Advantage of the Invention] According to the present invention, since the delay means for delaying the deployment of the second airbag is provided and the second airbag is deployed after the deployment of the first airbag, these first airbags are provided. It is possible to prevent the second airbag from interfering with each other during deployment and hindering their deployment.

Further, since the gas in the second airbag is prevented from leaking to the outside after the deployment of the second airbag,
The airbag covers the inner surface of the windshield with the internal pressure maintained regardless of the elapsed time after deployment, and when the vehicle collides, the occupant rebounds once after colliding with the first airbag. Even when the vehicle moves forward again, it is possible to reliably prevent the occupant from colliding with the windshield and protect the occupant.

[Embodiment] Hereinafter, a case where the present invention is applied to an airbag device for a driver's seat of an automobile will be described with reference to the accompanying drawings.

As shown in FIG. 5, the automobile 1 according to the present embodiment has a plurality of (for example, three) vehicles arranged near the front bumper 2 at the front end of the vehicle body as collision detection means for detecting a vehicle collision. The front sensor 11 and the dash sensor 12 attached to the dash panel 3 at the front of the vehicle compartment are provided.

Each of the front sensor 11 and the dash sensor 12 is configured by a G sensor which is well known in the related art, and the three front sensors 11 are arranged at predetermined intervals in the vehicle width direction. When a collision occurs, at least one of the front sensors 11 senses this.
On the other hand, the dash sensor 12 is turned on when the impact force (change in acceleration) due to the collision is equal to or more than a predetermined value. That is, the sensitivity of the dash sensor 12 is set to be lower than that of the front sensor 11, so that the dash sensor 12 is prevented from being sensitive to a slight collision.

Further, the automobile 1 is provided on the center pad 4a of the steering wheel 4, and is provided above the first airbag 13 and the instrument panel 7 which are deployed toward the occupant 6 seated in the driver's seat 5, and the front windshield is provided. And a second airbag 14 that is deployed above the first airbag 13 along the inner surface of the second airbag 8. By providing the second airbag 14, the occupant 6 is prevented from colliding, for example, when the occupant 6 is not wearing a seat belt.
It is possible to prevent the occupant 6 from colliding with the windshield 8 even when the vehicle moves forward beyond the first airbag 13.

More preferably, as shown in FIG. 4, the second airbag 14 has a substantially oval-shaped front characteristic when deployed so that it can be deployed up to the upper part of the windshield 8. As it is formed, its thickness T ₂ is
It is formed thinner than the thickness T ₁ of the first airbag 13 (for example, about 1/2) so that it can be easily deployed along the inner surface of the front windshield 8.

As shown in FIG. 3, the first airbag 13 is formed to have a circular front shape when inflated, like a normal airbag.

Further, the second airbag 14 is more preferably the first airbag.
The windshield 8 is made of a material having strength equal to or higher than that of a normal material used for the airbag 13 (for example, nylon with rubber coating inside), and the front windshield 8 is If it breaks, it will not be easily broken by broken glass.

The operation of the first airbag 13 and the second airbag 14 will be described below.

FIG. 1 is a circuit configuration diagram schematically showing the configuration of an electric circuit of the airbag device 10 according to the present embodiment. As shown in FIG. 1, the vehicle-mounted battery 9 to the first airbag 13 and the second airbag 13 are provided. In the power supply circuit L reaching the airbag 14, three front sensors 11 and one dash sensor 12 electrically arranged in parallel are connected in series, and the three front sensors 11 are connected. Any one of the above turns ON, and
When the dash sensor 12 is turned on, the power supply circuit L
Is supplied to. Then, in the power supply circuit L ₁ to the first airbag 13, the igniter 15 of the first airbag 13 is actuated, and the gas is generated in the gas generator (not shown) housed in the case 13a of the first airbag 13. The first airbag 13 is deployed by reacting the generator with the flame sensitizer.

That is, as shown in the block diagram of FIG.
When at least any one of the front sensors 11 and the dash sensor 12 are both turned on and the AND condition is satisfied, the igniter 15 of the first airbag 13 is immediately activated to deploy the first airbag 13.

By the way, in the present embodiment, when the second airbag 14 is deployed, the deployment of the first airbag 13 is prevented so as not to interfere with the first airbag 13 and interfere with each other. The second airbag 14 is deployed after the deployment.

That is, the power feeding circuit L ₂ of the second airbag 14 is provided with a well-known delay circuit 18 for delaying the power feeding from the battery 9 to the igniter 16 of the second airbag 13. Due to the action of the circuit 18, the actuation of the igniter 16 of the second airbag is actuated later than the igniter 15 of the first airbag 13. The operation characteristic of the delay circuit 18 is set so that the second airbag 14 is deployed after the first airbag 13 is deployed.

In addition, the second airbag 14 prevents the gas in the airbag 14 from leaking to the outside in order to maintain the pressure in the airbag 14 regardless of the time elapsed after the deployment. .

That is, in the case of the first airbag 13, like the normal airbag, a large number of gas discharge holes 13b are provided in the side surface portion of the case 13a, and the gas is discharged to the outside after being deployed. However, in the case of the second airbag 14 described above, the case 14a is not provided with a gas discharge hole and is formed in a hermetically sealed structure so that the gas pressure in the airbag 14 is maintained even after deployment. Has become.

As described above, according to this embodiment, the power supply circuit L ₁ of the second airbag 14 is connected to the igniter of the second airbag 14.
Since the delay circuit 18 for delaying the operation of 16 is provided and the second airbag 14 is deployed after the deployment of the first airbag 13, the first airbag 13 and the second airbag 14 are mutually deployed at the time of deployment. It is possible to prevent interference with each other and hinder the deployment of each.

In addition, the gas exhaust hole normally provided in the airbag is not provided in the second airbag 14 to prevent the gas in the second airbag 14 from leaking to the outside after the deployment. The airbag 14 covers the inner surface of the windshield 8 in a state where the internal pressure is maintained regardless of the lapse of time after deployment, and the occupant 6 once collides with the first airbag 13 during a vehicle collision. It is possible to reliably prevent the occupant 6 from colliding with the windshield 8 even when the vehicle rebounds and moves forward again.

In the above embodiment, the delay circuit for delaying the deployment of the second airbag 14 and deploying it after the deployment of the first airbag 13 is used as a delay circuit in the power supply circuit L ₂ of the second airbag 14.
18 is provided, but the combustion speed of the second airbag 14 is adjusted by adjusting the components of the gas generating agent and the flame retardant provided in the gas generator to deploy the airbags 13 and 14. Can be set later than the first airbag 13 and the second airbag 14 can be set to be deployed after the deployment of the first airbag 13.

Further, although the above-mentioned embodiment is applied to the airbag device for the driver's seat, the present invention is applicable not only to the driver's seat but also to the passenger's seat airbag device.
Of course.

[Brief description of drawings]

The drawings are all for explaining the embodiments of the present invention. FIG. 1 is a schematic configuration diagram of an electric circuit of an airbag device, FIG. 2 is a block configuration diagram of the airbag device, and FIG. FIG. 4 is a front view of the first airbag when it is deployed, FIG. 4 is a front view of the second airbag when it is deployed, and FIG. 5 is a schematic side view of a front portion of an automobile equipped with the airbag device according to the present embodiment. . 1 ... Automobile, 11 ... Front sensor, 12 ... Dash sensor, 13 ... First airbag, 14 ... Second airbag, 18 ... Delay circuit.

Claims (1)

[Scope of utility model registration request] 1. A collision detection means for detecting a collision of a vehicle, a gas generation means which operates in response to an output signal from the collision detection means, and a first air which is expanded toward an occupant by the gas generation means. A bag, a second airbag that is deployed above the first airbag by the gas generating means, a delay means that deploys the second airbag after the deployment of the first airbag, and the second airbag And a gas escape prevention means for preventing the gas in the second airbag from leaking to the outside after being deployed.