JP2561731Y2 - Airbag device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for inflating a bag in front of an occupant when the vehicle suddenly decelerates.

[0002]

2. Description of the Related Art As shown in FIG. 5, an airbag device 60 is provided with an inflator 62 for generating gas by combustion of a gas generating substance, and a bag body 64 is inflated by the gas generated by the inflator 62. I have.

[0003] A reinforcing cloth 66 is sewn to the periphery of the opening of the inner wall of the bag 64 in order to protect the bag 64 from high-temperature gas generated when the gas generating substance is burned.

[0004]

[Problem to be solved by the invention] However, the bag 6
In the conventional airbag device 60 in which the reinforcing cloth 66 is applied to the inner wall of the bag 4, the periphery of the opening of the bag 64 becomes thick, and the bag 6
There is a problem that the foldability of No. 4 is poor. Furthermore, there is a problem that the number of manufacturing steps of the airbag device 60 is increased by the amount of the sewing of the reinforcing cloth 66.

Further, as shown in FIG. 5, when the bag body 64 is folded, the gas ejection portion of the inflator 62 and the non-reinforcing portion 68 of the bag body 64 where the reinforcing cloth 66 is not sewn.
And face each other. Therefore, the high-pressure gas generated from the inflator 62 hits the non-reinforced portion 68 before the bag body 64 is deployed.

That is, in the conventional airbag device 60, after the bag body 64 is deployed, the periphery of the opening of the bag body 64 can be protected by the reinforcing cloth 66, but before the bag body 64 is deployed, that is, the bag body. When the bag 64 is folded sufficiently, the bag 64 cannot be protected from high-pressure gas. Therefore, it is necessary to take measures such as applying heat treatment to the entire inner wall of the bag body 64.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide an airbag device capable of protecting a bag body from a high-temperature gas generated by combustion of a gas generating substance.

[0008]

An airbag device according to the present invention comprises a gas generating means for generating a gas by burning a gas generating substance when the vehicle is suddenly decelerated, and a gas generated by the gas generating means. An inflatable occupant abutment bag, provided between the bag and the gas generating means, isolates the inside of the bag from the gas generating means and allows gas generated by the gas generating means to pass therethrough. And a thin member having a gas passage portion.

An airbag device according to the invention of claim 2 is
A gas generating means for generating gas by burning a gas generating substance when the vehicle suddenly decelerates, and an occupant arranged near the gas generating means in a folded state, wherein the folded portion is expanded by the gas generated by the gas generating means The bag for contact, and a container provided between the bag and the gas generating means, the opening of this container accommodates the folded bag and the bottom of the container has the bottom A thin member provided with a break portion that hits the end of the bag body in the folded state near the gas generating means, restricts the movement of the bag body in the direction of the gas generating means, and is broken by the gas generated by the gas generating means. It is characterized by:

[0010]

In the airbag device according to the first aspect of the present invention, when the vehicle suddenly decelerates, gas is generated by the combustion of the gas generating material of the gas generating means, and the gas passes through the gas passage of the thin member to form the bag. The bag is expanded by the pressure of the introduced gas.

At the time of this expansion, high-temperature gas is generated by the combustion of the gas generating substance, but this high-temperature gas is blocked by the thin member and does not reach the inner wall of the bag. Therefore,
The bag can be protected from hot gas.

An airbag device according to the invention of claim 2 is:
When the gas is generated by the combustion of the gas generating material of the gas generating means during the rapid deceleration of the vehicle, the thin member is broken at the breaking portion by the gas pressure. The gas is guided into the bag through the broken portion of the thin member, and the pressure of the gas causes the bag to expand.

In this case, before the thin member is broken, the high-temperature gas is blocked by the thin member and does not reach the inner wall of the bag. In addition, even when the high-temperature gas is generated not only in the initial stage of the combustion of the gas generating substance but also for a relatively long time, the thin member after the fracture hits the inner wall of the bag body by the gas, and the bag body can be protected against the high-temperature gas. Becomes Also, take thin parts
In the attached state, the container provided between the gas generating means and the bag body
As it holds a folded bag with a container shape, it can be mounted
The bag is stored in this thin member during handling and installation before
It is in a state of being folded, the folded state of the bag body has collapsed
Can be unfolded and fall apart
Absent. In addition, even in the mounted state, the bag is at the bottom of the thin member.
The movement toward the gas generating means is restricted by
The bag body is accidentally moved toward the gas generating means and folded
The expected shape is always stable without dislocation
Can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which an airbag device according to the present invention is applied to a passenger seat will be described below with reference to FIGS. In FIGS. 1 and 2, an arrow FR indicates a vehicle forward direction, an arrow UP indicates a vehicle upward direction, and an arrow IN indicates a vehicle interior direction.

As shown in FIG. 1, an opening 13 is formed in an instrument panel 14 disposed below the windshield glass 12 on the vehicle side.
The airbag device 10 is accommodated in the instrument panel 14 corresponding to 3. The airbag device 10 includes a bracket (not shown) attached to a body (not shown).
Has been fixed through.

The airbag device 10 includes a substantially box-shaped case 1.
8 is provided, and a side plate 22 disposed on the vehicle rear side of the case 18 has a boundary portion 23 with the upper plate 21 of the case 18.
Can be rotated about the center. The airbag device 10 includes a cover 16, and the cover 16
The bag 24 is covered. The cover 16 is fixed to the side plate 22 and is rotatable about a boundary 23 in a direction indicated by an arrow A in FIG. 1 (a direction away from the bag 24).

In the case 18, an inflator 32 is provided on the front side of the bag 24 with respect to the opening 24A of the bag 24 (see FIG. 2). Inflator 3
2, a detonator and a detonator (not shown) are provided, and a gas generating substance (not shown) is provided on the outer periphery of these. In the inflator 32, a plurality of gas holes 32A through which gas generated by combustion of the gas generating substance passes are formed toward the opening 24A of the bag body 24. In addition, a starter (not shown) is arranged on the inflator 32. The starter is provided with an inertial body that moves by inertia when the vehicle suddenly decelerates. Further, an ignition pin is provided in the activation unit, and the ignition pin is always urged in a direction of colliding with the squib, is normally locked and separated from the squib, and has an inertia of the inertial body. The locked state is released by the movement, and it collides with the primer and activates the primer.

A bag 24 and an auxiliary bag 26 are attached to the rear end of the upper plate 21 on the vehicle side. The periphery of the opening 24A of the bag body 24 is folded back and sewn in a state in which the planar shape as viewed from the vehicle front-rear direction side covers the mounting frame 28 having a substantially rectangular frame shape over the entire circumference. The locking portion 25 is provided. Further, the peripheral portion of the auxiliary bag 26 is formed as a locking portion 27 which is folded back and sewn in a state of covering the locking portion 25, and both the locking portion 25 and the locking portion 27 are sewn together. The bag 24 and the auxiliary bag 26 are attached to the mounting frame 28 by sewing on the intermediate portion between the bag 24 and the opening 24A. In this mounting state, the auxiliary bag 2
6 separates the inside of the bag from the inflator 32.

As shown in FIG. 1, in the auxiliary bag 26, in the attached state, a substantially central portion is disposed on the side opposite to the bag body 24, and a storage portion 26A is formed.
The bag body 24 is accommodated in a state of being folded along a substantially vertical direction of the vehicle. The bag body 24 and the auxiliary bag 26 are accommodated in the case 18 with the mounting frame 28 fixed to the peripheral edge of the case 18 on the vehicle rear side end by rivets 30.

The auxiliary bag 26 is formed of a heat-resistant cloth or a cloth coated with a heat-resistant coating. The auxiliary bag 26 communicates with the inside of the bag body 24 at a substantially central portion corresponding to the gas hole 32A of the inflator 32 and communicates with the inflator 32.
A plurality of gas passage holes 26B through which the gas generated by the gas passes are formed. The diameter of the gas passage hole 26B is:
At the time of rapid deceleration of the vehicle, the bag body 24 is inflated at a predetermined inflation speed, and is sized to allow gas to pass therethrough so as to reliably protect the occupant. Further, the size of the gas generating material is set to a size that can sufficiently prevent the high-temperature gas generated by the combustion of the gas generating substance from hitting the inner wall of the bag 24 or a size that does not adversely affect the bag 24 even when the passing high-temperature gas hits the bag 24. I have. In the above description, the gas passage hole 26B is formed over the entire area corresponding to the gas hole 32A, but may be formed only on a part.

The operation of this embodiment will be described below. In a normal state of the vehicle, a starter (not shown) arranged in the inflator 32 does not operate, and the cover 16 covers the bag 24.

When the vehicle suddenly decelerates from the normal state, the inertial body (not shown) moves by inertia, and the inertial movement of the inertial body releases the lock of the ignition pin, so that the ignition pin collides with the squib and the squib. Is ignited, the explosive is ignited, and the gas generating substance burns. Gas is generated by the combustion of the gas generating substance, and the gas is ejected toward the auxiliary bag 26 through the gas hole 32A. The gas injected into the auxiliary bag 26 passes through the gas passage hole 26B of the auxiliary bag 26 and is guided into the bag 24, and the bag 24 is inflated by the pressure of the gas. The cover 16 receives the pressure due to the expansion of the bag body 24, and the arrow A in FIG.
Then, the bag body 24 bulges toward the occupant from the opening formed by the rotation (the state of FIG. 2).

High-temperature gas is generated by the combustion of the gas generating substance, but the high-temperature gas is shut off by the auxiliary bag 26.
It does not hit the inner wall of the bag 24, and the bag 24 is not damaged by the high-temperature gas even when the heat-resistant coating is not applied to the bag 24. Therefore, the heat-resistant coating is unnecessary or a low-grade heat-resistant coating is sufficient, and the bag body 24 is not thickened. The bag body 24 can be easily folded and housed in the housing portion 26A. The exclusive space of the body 24 can be reduced. Also, the heat-resistant coating becomes unnecessary,
Manufacturing steps are reduced.

In this embodiment, the bag 24 is attached to the mounting frame 2.
8, the bag 24, the auxiliary bag 26, and the mounting frame 28 can be handled as a unit. For this reason,
The attachment of the bag 24 and the auxiliary bag 26 to the case 18 can be performed by a simple operation of fixing the attachment frame 28 to the upper plate 21 with the rivets 30. In addition, the folded bag 24 is accommodated in the accommodating portion 26A, so that the bag 24
Is held, the member for holding the bag 24 in the folded state when the bag 24 is transported becomes unnecessary.

FIGS. 3 and 4 show an airbag device 50 according to a second embodiment of the present invention. In the figure, basically the same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is different from the above embodiment in the auxiliary bag. The auxiliary bag 52 of this embodiment is formed with a perforation 54 as a break at a substantially central portion.
Are easily broken at the perforations 54. As shown in FIG. 4, the auxiliary bag 52 is dimensioned such that, after being broken at the perforation 54, it hits the peripheral edge 24 </ b> B of the opening of the inner wall of the bag 24 by gas pressure.

The broken portion is not limited to the perforation 54, and may be formed by joining the material at a substantially central portion with a cloth or the like having a lower strength than the auxiliary bag 52.

The operation of the second embodiment will be described below. In a normal state of the vehicle, a starter (not shown) in the inflator 32 does not operate, and the cover 16 covers the bag 24.

When the vehicle suddenly decelerates from the normal state, a gas generating substance (not shown) of the inflator 32 burns to generate gas, and this gas is ejected to the auxiliary bag 52 through the gas hole 32A. The auxiliary bag 52 is broken at the perforation 54 by the pressure of this gas, and the auxiliary bag 5
2 comes into contact with the peripheral portion 24B of the opening of the inner wall of the bag body 24 (state of FIG. 4). The gas is guided into the bag body 24 through the break portion, and the bag body 24 swells toward the occupant by this gas pressure as in the above-described embodiment.

The high temperature gas is generated by the combustion of the gas generating substance.
As a result, the bag 24 can be protected from the hot gas, and the broken auxiliary bag 52 abuts against the peripheral edge 24B of the inner wall of the bag 24 even after the bag 24 is broken. Can protect from high temperature gas. Therefore,
Also in this embodiment, it is not necessary to apply the heat-resistant coating to the bag 24, and the bag 24 can be easily folded and the occupied space of the folded bag 24 can be reduced. In addition, the manufacturing process is reduced because the heat-resistant coating is not required.

The place where the auxiliary bag 54 is constructed is not limited to the above embodiment, and various modifications can be applied.

[0032]

According to the present invention, the above-described structure has an excellent effect that the bag can be protected from high-temperature gas generated by combustion of the gas generating substance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a state in which an airbag device including a bag according to a first embodiment of the present invention is attached to a passenger seat.

FIG. 2 is an operation diagram of FIG. 1;

FIG. 3 is a cross-sectional view showing a state in which an airbag device having a bag according to a second embodiment of the present invention is mounted on a passenger seat.

FIG. 4 is an operation diagram of FIG. 3;

FIG. 5 is a cross-sectional view of an airbag device having a conventional bag body.

[Explanation of symbols]

 Reference Signs List 10 airbag device 24 bag body 32 inflator (gas generating means) 26 auxiliary bag (thin member) 26B gas passage hole (gas passage portion) 50 airbag device 52 auxiliary bag (thin member) 54 perforation (break portion)

Continuation of the front page (56) References JP-A-3-281460 (JP, A) JP-A-5-42856 (JP, A) Japanese Utility Model Application No. 51-47132 (JP, U) Japanese Utility Model Application No. 49-139747 (JP , U) Actual opening 48-91631 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A gas generating means for generating a gas by burning a gas generating substance when a vehicle suddenly decelerates, and a gas generator which is disposed near the gas generating means in a folded state, wherein the folded portion is a gas generated by the gas generating means. A bag for occupant abutment inflated by the container, a container provided between the bag and the gas generating means, and an opening having the container shape accommodates the bag in the folded state and a container. The bottom of the shape contacts the end near the gas generating means of the folded bag to limit the movement of the bag in the direction of the gas generating means, and has a gas passage portion through which the gas generated by the gas generating means passes. An airbag device comprising: a thin member movable toward the bag after gas generation. 2. A gas generating means for generating gas by burning a gas generating substance during rapid deceleration of a vehicle , wherein the gas generating means is disposed near the gas generating means in a folded state.
A foldable portion for inflating an occupant abutment in which the folded portion is inflated by gas generated by the gas generating means, and a container shape provided between the bag and the gas generating means.
And the container-shaped opening is in the folded state.
The bag-shaped bottom is accommodated and the container-shaped bottom is folded.
The bag near the end near the gas generating means.
An airbag device, comprising: a thin member that restricts movement in the direction of the gas generating means and has a break portion that is broken by gas generated by the gas generating means.