JPH10324218A - Air bag assembly for assistant seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag assembly for an assistant seat which does not require change of the shape of an inflator holding part and/or bottom holder each time the length of the inflator varies and which is free from risk of noise generation even if the bottom holder makes vibrational contact with the inflator. SOLUTION: An air bag assembly for an assistant seat is composed of an air bag 14, an inflator in cylindrical shape, and an assembly case 18 which holds the two members 14 and 16 in a single piece, wherein the assembly case 18 is equipped with an inflator holding part 20 and an air bag holding part 22 formed in continuity to the oversurface opening of the inflator holding part 20. A holder cylinder 32 for the root of the inflator 16 is installed at the inflator insert hole 26, and a soft resin covering 34 is formed at the foremost peripheral edge of the holder cylinder 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger airbag assembly using a tubular inflator.
In particular, the present invention relates to an airbag assembly for a passenger seat which is characterized by a structure for holding an inflator.

[0002]

BACKGROUND OF THE INVENTION A passenger airbag assembly generally includes a folded airbag, a cylindrical inflator connected to the airbag so that air can flow into the airbag, and a bag holder integrally holding the airbag and the inflator. The inflator holding portion has a configuration including a distal end wall to which the distal end protruding portion of the inflator is coupled, a base portion serving as an inflator insertion port, and a peripheral wall interposed therebetween.

[0003] The distal end side of the inflator has a bolt formed on the distal end wall of the inflator protruding from the distal end wall, and is fixed by tightening a nut or the like.

On the base side of the inflator, a flange or a notch formed in the base of the inflator is fixed by engaging with a peripheral wall of the inflator holding section.

[0005]

However, it is necessary to form receiving recesses or locking projections corresponding to the above-mentioned flanges and cutouts in the inflator holding portion, and the inflator holding portion is changed every time the length of the inflator is changed. It is necessary to change the shape of the part.

On the other hand, a tubular inflator which does not have the above-mentioned flange portion or cutout portion at the base of the inflator has been used from the viewpoint of manufacturing.

In the case where the above-mentioned flange portion and notch portion are not provided, the rear end portion of the inflator is fixed by interposing a resin bottom holder formed of PP or the like between the inflator bottom portion and the inflator insertion opening. There is a way to do that. The reason why the bottom holder is made of resin is to prevent abnormal noise from being generated when the inflator and the bottom holder come into vibration contact.

However, it is necessary to change the shape of the bottom holder every time the length of the inflator changes.

In view of the above, according to the present invention, it is not necessary to change the shape of the inflator holding portion and the bottom holding member every time the length of the inflator changes, and the bottom holding member and the inflator come into vibration contact. It is another object of the present invention to provide an airbag assembly for a passenger seat that does not cause noise or noise.

[0010]

Means for Solving the Problems To solve the above problems, an airbag assembly for a passenger seat according to the present invention has the following configuration.

An airbag in a folded state, a tubular inflator connected to the airbag so that air can flow into the airbag,
What is claimed is: 1. An airbag assembly for a passenger seat, comprising: an assembly case for integrally holding an airbag and an inflator, wherein the assembly case is formed continuously with an inflator holding portion and an upper surface opening side of the inflator holding portion. The inflator holding portion includes a tip wall to which a tip fixing member of the inflator is coupled, a base portion serving as an inflator insertion port portion, and a peripheral wall interposed therebetween for a passenger seat. In the airbag assembly, an inflator base holding tube for holding the base of the inflator is provided at the inflator insertion opening, and a resin coating portion is formed at a tip end of the inflator base holding tube. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG.
The description will be made based on Nos.

(1) The basic structure of a passenger airbag assembly (hereinafter sometimes simply referred to as “airbag assembly”) 12 of the present embodiment is as follows.

The airbag 14 includes a folded airbag 14, a tubular inflator 16 connected to the airbag 14 so that air can flow into the airbag 14, and an assembly case 18 integrally holding the airbag 14 and the inflator 16.

The assembly case 18 has an inflator holding portion 20 and an airbag holding portion 22 formed continuously on the upper surface opening side of the inflator holding portion 20.

The inflator holding portion 20 has a configuration in which a distal end wall 24 to which the distal end fixing member 17 of the inflator 16 is coupled, a base portion 26 serving as an inflator insertion port, and a peripheral wall 28 interposed therebetween. is there. In the illustrated example, the tip fixing member 17 is a structure in which the tip fixing member 17 is a bolt and is connected by fastening with a nut. However, a structure in which the tip fixing member 17 is bolted as a female screw may be used. You may.

The shape of the inflator 16 is not particularly limited as long as it is cylindrical, and is arbitrary such as a cylinder and a square tube. In the example shown,
It has a cylindrical shape provided with a gas discharge port 16a at one end of the cylinder.

The peripheral wall 28 forming the boundary between the inflator holding section 20 and the airbag holding section 22 is partially cut away to form a diffuser section 28a.
Further, in the present embodiment, although not indispensable, as part of the assembly, a bag pad 30 which is opened when the airbag is activated and forms the airbag outlet 29 is provided.

(2) In the above configuration, in the present embodiment,
An inflator base holding tube 32 for holding the base of the inflator 16 is disposed in the inflator insertion opening 26, and a soft resin coating portion 34 is formed on the peripheral edge of the front end of the inflator base holding tube 32.

Here, the resin coating portion 34 is made soft.
Indicates the sealing performance with the inflator holder 20 and the noise
This is to prevent occurrence. Soft means that the elastic modulus is 70 MPa (7
kgf / mm ^Two) Say the following (ASTM D 883). Also here
In the soft resin, soft polyethylene, olefin
Elastomers, etc., but soft polyurethane
Inflator made of metal such as rubber and polyvinyl chloride resin
It is desirable from the viewpoint of adhesiveness with the base holding tube 32. Especially,
Softness can be easily adjusted by plasticizer and coating work
Soft poly salt that is easy to dipping (dip coating)
Vinyl chloride resin is desirable.

Further, it is desirable that the resin-coated portion 34 be formed by a coating film, particularly by dipping.
When a molded resin cap is used, it takes time and effort to form and attach, and it is difficult to form a thin cap having no problem in strength. As a result, the gap between the inflator 16 and the inflator holding portion peripheral wall 28 is difficult. Is larger, which is against the demand for a compact airbag assembly.

Here, when the resin coating portion 34 is formed by a coating film, the coating thickness is usually 0.5 to 1.5 mm, preferably, 0.5 to 1.5 mm.
The coating length is 0.8 to 1.2 mm, and the coating length is 2 to 10 mm, preferably 4 to 8 mm. If the coating thickness and length are too small, the function of the soft resin coating portion 34, that is, the sealing function and the abnormal noise generation preventing function are difficult to be exhibited, and if too large, the quality is excessive.

The resin coating portion 34 is formed by dissolving in a plasticizer / solvent or the like, heating if necessary, and dipping (immersion coating) a viscous paint having a predetermined coating thickness. I do.

The inflator base holding tube 32 is composed of an unevenly distributed flange 34 on the inflator holding portion 20 of the assembly case 18 and a holding tube main body 36.

(3) Next, the assembling mode of the airbag assembly of the present embodiment is as follows.

The air inlet 14a of the folded airbag 14 is covered from the outer peripheral wall side of the air airbag holding portion 22 of the assembly case 18, and a pair of side contact plates 38, 40 are applied to the outer periphery of the airbag 14, At the upper position of the inflator holder 20, the diffuser 28a
Are fastened together with the first rivets 42 and 42 together with the plate constituting.

The bag pad 30 is connected to the side
It is positioned by the claws 44 and the stopper projections 46 formed on the parts 8 and 40 and assembled to the assembly case 18.

A pair of half bands 4 that jointly surround the peripheral surface of the airbag holding portion 22 of the assembly case 18
8 and 48 are fastened by the second rivets 43 and 43 at the front and rear end walls, respectively. At this time, at the same time, a mounting bracket 5 having one end to which a bolt 52 capable of being screwed to a mounting step 51 of the instrument panel 50 is welded.
4 and 54 are tightened together.

The inflator 16 is inserted from the base end of the inflator holding portion 20 and the bolt 17 at the tip is fixed to the tip wall 24.
And the nut 56 is fastened to the inflator 1
6 is fixed. At this time, the base of the inflator 16 is
The rear end protrudes and is held by the inflator holding cylinder 32. Therefore, even if the length of the inflator 16 is slightly changed, it is not necessary to change the shape of the assembly case 18.

Although not indispensable, in order to ensure the sealing performance more securely, the inflator insertion opening 26, which is the base of the inflator holding portion 20, is fixed and closed with a rivet (not shown) with the seal cap 58.

(4) The airbag assembly 12 assembled as described above is fixed to the airbag assembly 12 via the bolt 52 fixed to the mounting bracket 54 and the elastic locking claw 30a formed on the back surface of the bag pad 30. It is incorporated into the instrument panel 50 at the mounting position of the airbag assembly.

When the vehicle is vibrated during actual vehicle driving, the inflator is directly held by the soft resin coating portion at the distal end edge of the negative-flatter holding cylinder portion, so that no noise is generated due to the vibration contact. .

When the airbag is inflated, as in the prior art, the portion 30a of the bag pad 30 which is to be broken is broken, and the airbag outlet is opened.

[0034]

According to the airbag assembly of the present invention, the assembly case includes an inflator holding portion and an airbag holding portion formed continuously on an upper surface opening side of the inflator holding portion. A front end wall to which the front end fixing member of the inflator is coupled, a base portion serving as an inflator insertion opening portion, and a passenger seat airbag assembly having a peripheral wall interposed therebetween, in the inflator insertion opening portion, The following effects are provided by the configuration in which the inflator base holding tube for holding the base of the inflator is provided and the soft resin coating portion is formed at the tip end of the inflator base holding tube.

Each time the length of the inflator changes, it is not necessary to change the shape of the inflator holder and the bottom holder, and there is no danger of generating abnormal noise even when the bottom holder and the inflator come into vibration contact. .

Further, if the tip resin coating portion of the holding tube of the inflator base is formed by dipping, the productivity is better and the thickness can be reduced compared with the case where it is formed by a separate resin cap. As compared with the case where the covering portion is formed by the resin cap, it is relatively easy to respond to the demand for a compact airbag assembly.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of an airbag assembly showing one embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the same.

FIG. 3 is an overall perspective view of a bag holding cylinder used in the embodiment of FIG. 1;

[Explanation of symbols]

12 Airbag Assembly for Passenger Seat 14 Airbag 16 Inflator 18 Assembly Case 20 Inflator Holder 22 Airbag Holder 24 Tip Wall of Inflator Holder 26 Base of Inflator Holder (Inflator Insertion Port) 28 Perimeter of Inflator Holder Wall 28a diffuser plate 30 bag pad 32 inflator base holding cylinder 34 resin coating at tip of inflator base holding cylinder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noriyoshi Suzuki 1 Ochiai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. Address Toyota Gosei Co., Ltd.

Claims (2)

[Claims] 1. An airbag in a folded state, a cylindrical inflator connected to the airbag such that air can flow into the airbag, and an assembly case integrally holding the airbag and the inflator, wherein the assembly recase is provided. An inflator holding portion, and an airbag holding portion formed continuously on an upper surface opening side of the inflator holding portion. The inflator holding portion includes a tip wall to which a tip fixing member of the inflator is joined, and an inflator insertion. An airbag assembly for a passenger seat having a base portion that is a mouth portion and a peripheral wall interposed therebetween, wherein an inflator base portion holding cylinder that holds a base portion of the inflator at the inflator insertion opening portion. And a soft resin coating portion is formed at the tip of the inflator base holding cylinder. Passenger airbag assembly. 2. The airbag assembly for a passenger seat according to claim 1, wherein said resin coating portion is formed by dipping.