JPH0550891A - Fitting device for vehicle air bag opening - Google Patents

Abstract

PURPOSE:To increase the fitting strength of fitting opening for an air bag. CONSTITUTION:The peripheral edge of the opening of an air bag 3 is fixed between a retainer 2 and a retainer ring 6 by a rivet 5. The seating surface of the retainer 2 has at least two planes and a slope with a stepped part 15 between both the planes. The pressure-contact surface of the retaining 6 has a stepped part 16 with a slope conforming to the shape of the stepped part provided to the seating surface of the retainer 2. The peripheral edge of the opening of the air bag 3 is bent slantly along the stepped part 15 of the retainer 2 between at least two planes to increase its restraining force, and held firmly between the retainer 2 and the retainer ring 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air bag mouth mounting device for restraining an occupant in an automobile collision and protecting the occupant from the impact.

[0002]

2. Description of the Related Art It is said that the use of a vehicle airbag is effective as one of the measures for protecting an occupant in a vehicle collision, and it has already been put into practical use in some areas. It is rising.

A vehicle air bag is folded in the center of a steering wheel and is incorporated into the steering wheel. A sensor detects the impact at the time of a collision, and a gas generator called an inflator is activated by the detection signal to generate a high temperature, high pressure gas. Is supplied to the inside of the airbag, and the airbag is instantly inflated and expanded to act as a cushion for a part of the occupant's body, particularly the face.

The airbag is formed by sewing a pair of disc-shaped sheets on the periphery and opening an inflator insertion port and a vent hole in a part thereof, and the both sheets are connected by a hanging cloth if necessary. The inflator insertion opening and the vent hole opening edge are reinforced with a reinforcing cloth or a cloth.

When installing the airbag, as shown in FIG. 6, the retainer 2 is assembled to the hub portion 1a of the steering wheel 1, and the inflator insertion port 4 of the airbag body 3 is mounted on the seating surface of the retainer 2. Apply the opening edge,
The opening edge of the inflator insertion port 4 is crimped by the crimping surface of the retainer ring 6, and is integrally fixed by rivets or bolts 5. The inflator 7 is attached to the retainer 2,
The gas ejection port 7a faces the inside of the airbag body 3 through the opening of the retainer 2. The airbag body 3 is folded on the retainer 2, and the upper surface thereof is covered with the airbag cover 8.

Since an air bag withstands a strong tension generated when it is inflated and expanded, a strong mounting structure is required.

Conventionally, in order to improve the mounting structure of the airbag,
As shown in FIG. 7, the peripheral edges of the bag mounting substrate (retainer) 2 and the bag pressing plate (retainer ring) 6 are expanded outward at the same angle as the inclination angle α when the airbag body 3 is deployed (actually, As shown in FIG. 8, the base cloth of the airbag body 3 is sandwiched between the retainer 2 and the retainer ring 6, and the cushion sandwiching surface of at least one of the retainer ring 6 and the retainer 2 is held. Those having irregularities (see Japanese Utility Model Laid-Open No. 52-119234), and FIG.
A plurality of protrusions are provided on the surfaces of the retainer 2 and the retainer ring 6 that face each other as shown in FIG.
Which is designed to be embedded in the opening edge of the (Japanese Patent Laid-Open No. 2-13
No. 3265) is known.

[0008]

However, although the structure shown in FIG. 7 seems to be effective in preventing damage due to bending of the airbag, the airbag main body is pulled from between the retainer 2 and the retainer ring 6 during inflation and expansion. The function to prevent the escape of 3 has not been improved.

In addition, the structure of FIGS. 8 and 9 is, in short, to increase the frictional resistance by digging the convex edge or the protrusion into the fabric of the airbag. If it is bitten, the sharp edge will crack the airbag, and there is a risk of bursting when the airbag is inflated and expanded.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mounting device for an airbag opening for a vehicle, which is capable of tightly tightening the airbag between a retainer and a retainer ring without causing an excessive force at the opening edge of the airbag.

[0011]

In order to achieve the above object, in a vehicle air bag mouth mounting apparatus according to the present invention, a retainer and a retainer ring are provided, and an opening edge of the air bag is provided between the retainer and the retainer ring. A structure for an air bag mounting port for a vehicle, which is fastened with scissors, rivets, etc., wherein the retainer is for mounting an inflator, and the seating surface of the airbag has at least one step, and the step is the retainer. Is formed on a slope connecting two flat surfaces in the radial direction of the retainer ring, and the retainer ring has at least one step portion conforming to the step shape of the retainer on the crimping surface of the airbag, and the retainer step and the retainer ring. The step of the ring is a part of the airbag that is bent along the shape of both steps to restrain the airbag between the retainer and the retainer ring. That.

[0012]

[Function] The step of the retainer and the step of the retainer ring are fitted to each other in the same shape, and the opening edge of the airbag sandwiched between the two fits firmly to the shape of the step and the step. By only bending the two planes and an inclined shape connecting the two planes, the restraint force between the retainer and the retainer ring is increased without causing the fabric of the airbag to be unreasonable.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of essential parts showing a first embodiment of the present invention.

The airbag body 3 has its opening edge overlapped with the seating surface of the retainer 2, a retainer ring 6 is applied to the upper surface, and the rivet 5 is inserted from the retainer 2 side onto the airbag body 3 and the retainer ring 6. The procedure for tightening together is the same as before. Injector 7a of inflator 7
Is inserted into the airbag body 3 through the opening of the retainer 2.

According to the present invention, as shown in FIG. 2, the seating surface of the retainer 2 on which the opening edge of the airbag body is to be installed has a first plane 10 and a second plane 1 from the inside in the radial direction.
The first plane 10 and the third plane 12 are planes having the same height, the second plane 11 is lowered by one step, and a step 15 is formed between the planes. Formed,
The first plane 10 and the second plane 11 are the first plane 10
Are connected by a first slope 13 that inclines downward from the second plane 11 to the second plane 11, and the second plane 11 and the third plane 12 incline upward from the second plane 11 to the third plane 12. It is connected by the second slope 14 that is formed.

On the other hand, the crimping surface of the retainer ring 6 is provided with a step portion 16 corresponding to the step 15 formed by the combination of the flat surface and the inclined surface formed on the retainer 2, and the opening of the airbag body 3 superposed on the retainer 2. When the retainer ring 6 is crimped onto the rim, the fabric of the airbag body 3 has a step 15
When the retainer 2 and the step portion 16 are engaged with each other, the retainer 2 is deformed along the plane and slope shape of the retainer 2 and is sandwiched between the retainer 2 and the retainer ring 6.

The deformation of the fabric of the airbag body 3 is caused by the step 1
Since there is only an inclination between the two planes 10, 11 and 11, 12 forming the 5, there is no overloading of the fabric which would cause local cracking.

Moreover, the force in the escape direction received by the airbag at the time of inflating and expanding becomes a pressure-bonding force on the slopes 13 and 14 of the retainer 2 to increase the friction resistance and the restraining force.

According to the present invention, the step 15 between at least two planes having different heights is provided with an inclined surface on the retainer, and a step portion having a shape adapted to the step is provided on the retainer ring 6. Is not limited to the example of FIG.
In FIG. 3, the central second plane 11 is formed in the upper stage, and the left and right first and third planes 10, 12 are formed in the same plane in the lower stage, and the step 15 between the planes is formed with the first and second slopes. 4, the first plane 11 is the lower stage, the second plane 11 is the middle stage, and the third plane 12 is the upper stage. In the example of connecting the slopes, as shown in FIG. 5, conversely, the first plane 10 is the upper stage, the second plane 11 is the middle stage, and the third plane 12 is the lower stage, and the steps 15 between the planes are gradually lowered in the radial direction. This is an example of connecting with a slope.

The retainer 2 is attached to the pressure-bonding surface of the retainer ring 6.
Is provided with a step 16 adapted to the step 15. In any case, the effect is the same as that of the embodiment shown in FIG. The fabric of the airbag can be bent in an inclined shape at at least one step 15 between the planes of the upper and lower planes of the plane to increase the restraining force between the retainer 2 and the retainer ring 6 without making the fabric unreasonable. ..

[0021]

As described above, according to the present invention, the cloth at the opening edge of the airbag is firmly tightened by the slope of the step between the two planes provided on the seating surface of the retainer and the crimping surface of the retainer ring. As a result, there is an effect that the mounting strength of the airbag can be increased without being unreasonably increased and that it can greatly contribute to ensuring the safety of the occupant.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a view showing a step shape of a retainer.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing an installation example of an airbag.

FIG. 7 is a diagram showing an example of a conventional airbag mounting structure.

FIG. 8 is a view showing another example of a conventional airbag mounting structure.

FIG. 9 is a view showing still another example of the conventional air bag mounting structure.

[Explanation of symbols]

 1 Steering Wheel 2 Retainer 3 Airbag Body 4 Inflator Insertion Port 5 Rivet 6 Retainer Ring 7 Inflator 10 First Plane 11 Second Plane 12 Third Plane 13 First Slope 14 Second Slope 15 Step 16 Step Department

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Uemura 2-3-1 Shinohara Aki Noyamacho, Nada-ku, Kobe City, Hyogo Prefecture Rokkodai Shinko Dormitory (72) Takashi Sato 3302-6 Minamiodamachi, Ashikaga City, Tochigi Prefecture (72) ) Inventor Toshio Inami 1-46 Kaminoshinmachi, Ashikaga City, Tochigi Prefecture (72) Inventor Keiji Hayashi 79 Shimoshiburucho, Ashikaga City, Tochigi Prefecture

Claims (1)

[Claims] 1. A structure of an airbag mounting opening for a vehicle, comprising a retainer and a retainer ring, sandwiching an opening edge of the airbag between the retainer and the retainer ring, and fastening with a rivet or the like, wherein the retainer includes an inflator. The airbag has at least one step on the seating surface of the airbag, and the step is formed on a slope that connects two radial planes of the retainer, and the retainer ring is the step of the retainer. The airbag has at least one step portion conforming to the shape on the crimping surface of the airbag, and the step of the retainer and the step portion of the retainer ring are formed by bending a part of the airbag along the shape of both steps. A device for mounting an airbag opening for a vehicle, characterized in that the bag is restrained between a retainer and a retainer ring.