JPH08198045A - Air bag device - Google Patents

Abstract

PURPOSE: To provide the air bag device which can prevent an air bag from being damaged by heat generated by an inflator. CONSTITUTION: The air bag device M1 is made up of an air bag 1 equipped with a gas inflow port 1a, an inflator 2 feeding gas for expansion to the inflow port 1a, and of a bag holder 4 holding the air bag 1. The air bag 1 is held by the bag holder 4 while the circumferential periphery of the gas inflow port 1a is being held in a space between a flange section 2c formed in the outer circumferential surface of the inflator 2 and the back holder 4 disposed at the lower surface side of the flange section 2c. And heat insulating material 10 is disposed at a contact area with the inflator 2 in the circumferential periphery of the gas inflow port 1a of the air bag 1.

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, an instrument panel in front of a passenger seat, a door, a seat or the like.

[0002]

2. Description of the Related Art Conventionally, there is an airbag device shown in FIG. 1 (European Patent Publication No. 0625448A).
1).

This airbag device M0 is a bag-shaped airbag 1 and a gas discharge port 2b for supplying gas to the airbag 1.
And an inflator 2 having an upper part of the main body 2a, a bag holder 4 for holding the airbag 1, and a pad 9 for covering the airbag 1 held by the bag holder 4 and folded.

Further, the airbag 1 has a gas inflow hole 1a at the center of the lower part thereof, and the inflator 2 has a flange portion 2c formed on the outer peripheral surface of the main body 2a.
A plurality of bolts 3 extending downward were fixed to the. In addition, the inflator 2 instantaneously burns a predetermined medicine filled therein to rapidly discharge an inert gas such as nitrogen gas from the gas discharge port 2b.

The bag holder 4 comprises a bottom wall 5 and a side wall 6 extending upward from the peripheral edge of the bottom wall 5, and the main body 2a of the inflator 2 can be inserted into the center of the bottom wall 5 from above. The through hole 5a was provided.

In the airbag 1, the bolt 3 extending from the inflator flange portion 2c is attached to the gas inlet hole 1a.
The gas inflow hole 1a is inserted into the peripheral edge and the insertion hole peripheral edge 5a of the bag holder bottom wall 5 and fixed by the nut 7, so that the peripheral edge of the gas inflow hole 1a and the peripheral edge of the insertion hole 5a of the bag holder bottom wall 5 are connected. It was held between the upper surface and the bag holder 4 by being sandwiched.

The pad 9 is locked by the side wall 6 of the bag holder 4 and is prevented from coming off from the side wall 6 by the retainer 8 which is fastened together with the bag holder 4 by using the bolt 3 and the nut 7. It was assembled and assembled.

[0008]

However, in the conventional airbag device M0, the periphery of the gas inlet hole 1a of the airbag 1 includes the main body 2 including the flange portion 2c of the inflator 2.
Since it was in contact with the outer peripheral surface of a, the air bag 1 might be damaged by the heat generated when the inflator 2 generated gas.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide an airbag device capable of preventing damage to the airbag due to heat generated from an inflator.

[0010]

A first airbag device according to the present invention is an airbag provided with a gas inflow hole,
An inflator that supplies inflation gas to the gas inflow hole, and a bag holder that holds the airbag, the airbag, a flange portion formed on the outer peripheral surface of the inflator, An air bag device in which the gas inlet hole peripheral edge is sandwiched between the bag holder arranged on the lower surface side of the flange portion and held by the bag holder, wherein the gas inlet hole peripheral edge of the airbag is provided. In the contact site with the inflator in
It is characterized in that a heat insulating material is interposed.

A second airbag device according to the present invention is an airbag having a gas inlet hole, an inflator for supplying inflation gas to the gas inlet hole, and a bag holder for holding the airbag. Is configured with
The airbag has the gas inlet hole peripheral edge sandwiched between a flange portion formed on an outer peripheral surface of the inflator and the bag holder arranged on a lower surface side of the flange portion, and the bag holder. The air bag device retained by the inflator, wherein a heat dissipation plate is provided on the inflator.

[0012]

In the first airbag device according to the present invention, since the heat insulating material is interposed at the contact portion of the gas inlet hole of the airbag with the inflator, even if the inflator generates heat. The heat insulating material makes it difficult for the heat of the inflator to be transmitted to the airbag, and prevents the airbag from being damaged by the heat.

Further, in the second airbag device according to the present invention, since the heat radiating plate is arranged in the inflator, even if the inflator generates heat, the heat is radiated by the heat radiating plate. As a result, heat conduction to the airbag in contact with the inflator is suppressed and damage to the airbag due to heat can be prevented.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. The same members as those in the conventional example are designated by the same reference numerals.

The airbag apparatus M1 of the first embodiment is shown in FIG.
As shown in FIG. 3, it is arranged in the steering wheel main body W, and includes an airbag 1, an inflator 2, a bag holder 4, a retainer 8, and a pad 9.

The airbag 1 has a bag-like shape and is provided with a gas inflow hole 1a at the center of the lower portion, and a mounting hole 1b through which the bolt 3 is inserted is arranged at the periphery of the gas inflow hole 1a.

As shown in FIGS. 2 and 3, the inflator 2 is provided with a substantially columnar main body 2a. The main body 2a is provided with a plurality of gas discharge ports 2b for discharging gas and has an outer peripheral surface. A flange portion 2c to which four bolts 3 extending downward are fixed is formed.

As shown in FIGS. 2 and 4, the bag holder 4 is provided with a rectangular bottom wall 5 and a side wall 6 extending upward from the outer peripheral edge of the bottom wall 5, and in the center of the bottom wall 5, Insertion hole 5a into which the main body 2a of the inflator 2 can be inserted from above
Is formed, and the inflator 2 is attached to the periphery of the insertion hole 5a.
A mounting hole 5b for inserting the bolt 3 extending from is formed. At the upper end of the side wall 6, a hook portion 6a that can be locked in the locking groove 9a of the pad 9 is formed. Further, a nut 6b is screwed to a portion of the side wall 6 extending upward from the periphery of the short side of the bottom wall 5. These nuts 6b serve as a portion for bolting the airbag device M1 to the steering wheel body W.

The retainer 8 is constructed as two parts arranged on the outer sides of the two opposing surfaces of the side wall 6 of the bag holder 4 (see the chain double-dashed line in FIG. 4), and the bolts 3 respectively.
The nut 7 will be fastened together with the bag holder 4. Each retainer 8 is composed of a bottom wall 8a that comes into contact with the bottom wall 5 of the bag holder 4, and a side wall 8c that extends upward from the end of the bottom wall 8a. A mounting hole 8b into which the bolt 3 can be inserted is formed in the bottom wall 8a, and the side wall portion 8c is a portion into which the upper end is inserted into the insertion groove 9b of the pad 9.

The pad 9 comprises a ceiling wall 9c and a side wall 9d extending downward from the outer peripheral edge of the ceiling wall 9c in a square tubular shape. The bag holder 4 described above is provided on the inner peripheral surface of the side wall 9d. An engaging groove 9a for engaging the hook portion 6a is formed, and an inserting groove 9b for inserting the upper end of the side wall 8c of the retainer 8 is formed at two predetermined positions on the end surface of the side wall 9d.

In the airbag device M1 of the first embodiment, an annular heat insulating material 10 is arranged between the peripheral edge of the gas inlet hole 1a of the airbag 1 and the inflator 2. This heat insulating material 10 has heat resistance of about 950 ° C. and flexibility, and has a thickness of about 1 mm and is made of a silica fabric (trade name “Taigasil silica fabric YO551 /
480 "(Courtles Japan Limited), and is sewn or bonded to the airbag 1. The heat insulating material 10 also has a mounting hole 10a through which the bolt 3 penetrates.

The assembly of the airbag device M1 will be described. The gas inflow hole 1a is used to insert the inflator 2 into the airbag 1, and the bolt 3 extending downward from the inflator 2 is attached to the heat insulating material 10 and the airbag 1. It is made to project from the mounting holes 10a and 1b.

After that, the airbag 1 is folded and the bolts 3 are inserted into the mounting holes 5b to dispose the bag holder 4 in the lower portion of the airbag 1, and the hook portion 6a of the bag holder 4 is attached to the pad 9. The pad 9 is assembled to the bag holder 4 by engaging with the engaging groove 9a.

Then, the side walls 8c are respectively inserted into the insertion grooves 9b, 9b of the pad 9, each bolt 3 is inserted into the mounting hole 8b, and each nut 3 is screwed into each bolt 3 to attach the retainer 8 to the bag holder. When assembled in 4, the airbag device M1 can be assembled.

After that, the nuts 6b and 6 of the bag holder 4 are
The airbag device M1 may be attached to the steering wheel body W by using b.

After the airbag device M1 is mounted on the vehicle, the inflator 2 generates gas, and the gas is discharged from the gas discharge port 2b, so that the airbag 1 is greatly inflated. In the airbag device M1, since the heat insulating material 10 is interposed in the contact portion of the gas inflow hole 1a with the inflator 2, even if the inflator 2 generates heat, the heat of the inflator 2 is generated by the heat insulating material 10. 1 is difficult to be transmitted to the air bag 1, and damage to the air bag 1 due to heat can be prevented. In addition,
In the airbag 1, the ceiling wall 9c of the pad 9 is broken and greatly inflated.

The airbag apparatus M of the second embodiment shown in FIG.
Similar to the airbag device M1 of the first embodiment, 2 is configured to include an airbag 1, an inflator 2, a bag holder 4 made of sheet metal, a retainer 8 and a pad 9,
The difference from the airbag device M1 of the first embodiment is that the main body 2a of the inflator 2 is provided without providing the heat insulating material 10.
A heat radiating plate 11 that dissipates heat is arranged in the lower part of the.

The heat dissipation plate 11 is formed of a metal plate such as aluminum having a high thermal conductivity, and has a bottom wall 11a that abuts the bottom surface of the main body 2a of the inflator 2, and a side wall 11b that rises upward from the periphery of the bottom wall 11a. ,,
In the case of the embodiment, the bottom wall 11a is arranged by being adhered or screwed to the bottom surface of the inflator body 2a. The heat sink 11 is arranged by fixing the retainer 8 to the nut 7 and then fixing the retainer 8 to the inflator body 2.
The assembly of the airbag device M2 will be completed.

In the airbag apparatus M2 of the second embodiment, after the airbag 2 is mounted on the vehicle, the inflator 2 generates gas, the gas is discharged from the gas discharge port 2b, and the airbag 1 is greatly inflated. Even if the inflator 2 generates heat, the heat is dissipated by the heat dissipation plate 11,
The conduction of heat to the airbag 1, which is in contact with the inflator body 2a including the flange portion 2c, is suppressed, and damage to the airbag 1 due to heat can be prevented.

It should be noted that the heat radiating plate 11 of the airbag device M2 of the second embodiment is provided from the periphery of the insertion hole 5a in the bottom wall 5 of the bag holder 4 like the airbag device M3 of the third embodiment shown in FIG. A bag holder 4 including a side wall 14b extending downward and a flange 14a extending inward from the lower end of the side wall 14b and abutting the bottom surface of the inflator body 2a.
The heat sink 14 may be integrated with the heat sink 14. Furthermore, this third
As in the airbag device M3 of the embodiment, the heat dissipation plate 14 and the heat insulating material 10 may be used together.

Further, the airbag device M of the first to third embodiments
In 1 to M3, the bag holder 4 for sandwiching the airbag 1 with the flange portion 2c of the inflator 2 has the retainer 8
Although the pad 9 is held by using the above, the pad 9 may be attached to the bag holder side wall 6 by using a rivet or the like without using the retainer 8. By the way, in this case, it is desirable to dispose a hard insert such as a metal plate on the pad 9 in order to fasten a fixing means such as a rivet.

Further, in the airbag devices M1 to M3 of the first to third embodiments, the case where they are arranged on the steering wheel is shown, but of course, they are arranged on other instrument panels, doors and the like in front of the passenger seat. The present invention may be applied to an airbag device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a conventional airbag device.

FIG. 2 is a cross-sectional view of the airbag device showing the first embodiment of the present invention.

FIG. 3 is a bottom view of the inflator according to the same embodiment.

FIG. 4 is a bottom view of the bag holder according to the embodiment.

FIG. 5 is a sectional view of a second embodiment.

FIG. 6 is a sectional view showing a modification of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airbag, 1a ... Gas inflow hole, 2 ... Inflator, 2c ... Flange part, 4 ... Bag holder, 10 ... Heat insulating material, 11 * 14 ... Radiating plate, M0 * M1 * M2 * M3 ... Airbag apparatus.

Claims (2)

[Claims] 1. An air bag having a gas inflow hole, an inflator for supplying inflation gas to the gas inflow hole, and a bag holder for holding the air bag, the air bag comprising: The air held in the bag holder by sandwiching the gas inlet hole peripheral edge between the flange portion formed on the outer peripheral surface of the inflator and the bag holder arranged on the lower surface side of the flange portion. An airbag device, wherein a heat insulating material is interposed at a contact portion of the gas inlet hole of the airbag with the inflator. 2. An air bag having a gas inflow hole, an inflator for supplying inflation gas to the gas inflow hole, and a bag holder for holding the air bag, the air bag comprising: The air held in the bag holder by sandwiching the gas inlet hole peripheral edge between the flange portion formed on the outer peripheral surface of the inflator and the bag holder arranged on the lower surface side of the flange portion. A bag device, wherein a heat dissipation plate is provided on the inflator.