JPH092191A - Air bag device - Google Patents

Abstract

PURPOSE: To provide an air bag device to reliably fix an air bag and an inflator to a base plate through a simple method, realize ideal expansion of the air bag, save a space for a device, and automate a containing work for the air bag. CONSTITUTION: In an air bag device wherein an inflator 5 to inject gas, an air bag 4 inflated by means of gas injected from the inflator 5, and a case body to contain the inflator 5 and the air bag 4 are fixed to a base plate 2, the inflator 5 is formed in a long cylindrical shape, at least one end face of the inflator 5 has an outer periphery on which a flange part 5c is formed and a recessed part 5d is formed in a central part of the end face. In such a state that the air bag 4 is nipped by the end face, a retainer 7 peripheral wall surfaces 7b and 7c of which are erected in the same direction from the inner and outer peripheries of a plate-form annular body 7a is fitted in the end face with the air bag 4 nipped therebetween.

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 protecting an occupant from a shock such as a collision of a vehicle.

[0002]

2. Description of the Related Art Conventionally, an airbag device for a driver is built in a center pad of a steering wheel,
When a vehicle collides with the vehicle, the impact is detected and the airbag is activated, and the airbag is inflated from the center pad toward the driver to protect the driver.

As an inflator for generating a gas for inflating an airbag, a small amount of ignition agent is put in the center of a metal container, and a large amount of nitrogen gas is instantaneously generated by a chemical reaction with the ignition agent. It has been adopted that has tablets that generate such as. This inflator is
It has a so-called flat disk shape with a larger diameter than its length.

An airbag device employing such a disk-shaped inflator is disclosed in Japanese Utility Model Laid-Open No. 2-91051. In this airbag device, a flange is extended around the periphery of the inflator, the airbag is provided with an opening having the same diameter as the upper portion of the inflator having a gas ejection port, and a plurality of bolts are inserted around the opening. A hole is formed. To attach these inflators and airbags to the base plate, insert the bolts into the bolt insertion holes provided in the flange of the inflator, cover the opening of the airbag from above the inflator, and stack the openings on the lower side of the flange. , The bolt is projected outside from the bolt insertion hole of the airbag. In this state, the bolts are fastened with nuts or the like, and the inflator and the airbag are fixed to the base plate.

In this air bag system, a patch cloth is sewn on the openings of the air bag where the tensile stress is concentrated when the air bag is deployed and the peripheral portions of the bolt insertion holes to reinforce,
The damage of the airbag and the gas escape at these mounting parts are prevented.

[0006]

However, although the peripheral edge of the opening can be sandwiched over a relatively large area, a predetermined thickness is required for hermetically sandwiching, and excessive reinforcement is required. I don't get. Therefore, there is a problem that the process becomes complicated and the material cost and the processing cost are high. Further, conventionally, inflators generate gas by burning chemicals, and high-temperature, high-pressure gas is radially ejected from ejection ports of the inflator when the airbag is deployed. For this reason, in order to achieve the ideal deployment of the airbag, it is necessary to form the airbag cover in the vicinity of the mounting portion of the airbag cover using a material in which thermal characteristics are taken into consideration in consideration of this. However, the cost becomes high.

Further, the air bag is efficiently folded around the periphery and the surface of the disk-shaped inflator and is stored in the space formed between the base plate and the air bag cover. In addition to the labor required for storage, the production efficiency is significantly reduced, the size of the airbag device becomes large, the visibility of the instrument deteriorates, the appearance is unfavorable, and automation of the manufacturing process becomes difficult.

The present invention has been made in order to solve the above-mentioned problems, and an air bag and an inflator can be reliably fixed to a base plate by a simple method, and the air bag is ideally prevented from being damaged when inflated. An airbag device capable of easily realizing the inflated form, reducing the depth (thickness) of the entire device, easily storing the airbag in the space between the base plate and the airbag cover, and automating the storing work. The purpose is to provide.

[0009]

In order to achieve such an object, an inflator for ejecting gas, an airbag for inflating by the gas ejected from the inflator, and a case body for accommodating the inflator and the airbag are used as a base plate. An airbag device fixedly provided, wherein the inflator has an elongated cylindrical shape, and the airbag is sandwiched and mounted by a retainer fitted to a peripheral edge of the inflator at least at one end face thereof. An airbag device is provided.

More preferably, one end surface of the inflator is formed with a flange portion on the outer periphery thereof, and a recess is formed at the center of the end surface, and the retainer is formed of a flat plate-shaped annular body, and the inner periphery and outer periphery thereof are formed. The peripheral wall surfaces are erected in the same direction.

The retainer and one end surface of the inflator are fixed by screws, or screw portions which are respectively screwed into the retainer and one end surface of the inflator are integrally formed, and the retainer and the retainer are formed by these screw portions. The inflator is fixedly attached.

[0012]

In order to assemble the airbag device, first, a long cylindrical inflator is inserted into the airbag through the vent hole of the airbag. Pull out the lead wire and connector of the inflator inserted inside the airbag from the lead wire insertion hole of the airbag, project the fixing bolt of the inflator from the bolt insertion hole of the airbag, and then install the inflator cylindrical body with the airbag. Include. Then, the flange portion of the inflator is overlapped with the lead wire insertion hole, and the retainer is fitted to the flange portion so as to sandwich the airbag. In this way, the inflator is mounted inside the airbag and then fixed to the base plate. After that, the airbag is folded on the airbag supporting surface of the base plate in a predetermined order and pushed into the inside of the airbag cover, and the peripheral portion of the cover is attached and fixed to the peripheral attaching portion of the base plate.

According to the present invention, since the inflator has a long cylindrical shape, the accommodating portion of the inflator can be eccentrically arranged above the base plate, and at the same time, the folding accommodating space of the airbag can be simplified. , Not only facilitates the automation of the folding process of the airbag, but also facilitates the loading work of the airbag into the airbag cover to improve the working efficiency.

The most remarkable point of the present invention having the above-mentioned structure is that the inflator has a long cylindrical shape and is mounted in the airbag. Therefore, the retainer can clamp and fix the airbag at one end portion of the inflator having a long cylindrical shape, and the airbag is prevented from being damaged or degassing around the hole provided for attaching to the airbag. Strict reinforcement of the hole is not required. Further, since the airbag is supported by most of the circumferential surface of the substantially cylindrical inflator over substantially the entire length, it is possible to support the load at the time of inflating and deploying the airbag in the entire support region, and effectively inflate the airbag. You can also

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a steering wheel equipped with a typical airbag device according to the present invention.
FIG. 2 is a cross-sectional view taken along the line I-I of the airbag device in FIG.

The steering wheel 10 is constructed by being fastened to a boss plate via a plurality of spokes 10b at positions displaced downward from the center of the wheel ring 10a. The boss projects on the back side of the boss plate,
This boss is fixed to the upper end of the steering wheel shaft. Brackets are projectingly provided on the left and right ends of the boss plate, and the base plate 2 of the airbag module 1 is fastened to the brackets by cap bolts or the like.

The air bag module 1 is provided with a base plate 2, an air bag cover 3, an air bag 4, an inflator 5, a rectifying member 6 and a retainer 7. In the illustrated example, the air bag cover 3 is made of various soft materials like the conventional ones. It is composed of an elastomer resin, and is composed of a mounting frame portion 3a and a flat plate-like cleavage portion 3b having an eaves portion extending over the periphery on one surface side of the mounting frame portion 3a, and the cleavage portion 3b has a substantially H shape. The tear line 3c composed of a thin wire portion is formed,
The mounting frame portion 3a has a fixing hole 3d for the base plate 2, and is substantially the same as the conventional one.

The airbag 4, the inflator 5 and the rectifying member 6 are housed in a space formed between the base plate 2 and the airbag cover 3, and the inflator 5 and the rectifying member 6 in this embodiment are in the housing space. Is laid sideways above and the airbag 4 is folded in the space portions in front of and below.

The structure of each member of the airbag module 1 will be described below, centering on the inflator 5. FIG. 3 is an exploded perspective view in which the structure of a typical first embodiment of the airbag module of the present invention is partially omitted, and FIG. 4 is a cross-sectional view when the same embodiment is assembled.
The shape of the inflator 5 is not a flat disc shape as in the past, but is an elongated, for example, thick metal cylindrical body with both ends closed. This body is a large-diameter body 5a and a small-diameter body 5
b and the large diameter main body 5a is smaller than the small diameter main body 5b,
It is larger by the thickness of the wall of the flow regulating member 6 described later. A high pressure gas container (not shown) in which a large amount of inert gas such as nitrogen gas is compressed and stored in the inside of the main bodies 5a and 5b, and a wall surface of the high pressure gas container which locally breaks when the airbag device is activated are shown. It has a built-in boot unit.

A flange 5c is provided on the end surface on the large diameter body 5a side, and a circular recess 5d is formed in the center of the end surface. Two lead wires 50, 50 connected to a starter (not shown) inside the inflator are provided from substantially the center of the recess 5d.
Has been pulled out. A connector 51 for connecting to a controller unit or the like is provided at the ends of the lead wires 50, 50, and the lead wire 50, 50 and the connector 51 output from the controller unit or the like when a shock is applied to the vehicle. The activation signal is transmitted to the activation device inside the inflator (not shown). A plurality of screw holes 5e are provided on the outer periphery of the recess 5d on the end face.

A ring-shaped recess 5f is formed in the vicinity of the end on the side of the small-diameter body 5b, and the gas ejection port 5 is formed on the peripheral surface thereof.
A plurality of g are formed. Further, a mounting bolt 5h is provided at a position eccentric from the end face.

The rectifying member 6 is a bottomed cylinder whose inner diameter is substantially the same as the outer diameter of the small-diameter main body 5b of the inflator 5, and one end of which is closed and the other end of which is open. It is formed by press molding and bonding. Closed end 6
A mounting bolt insertion hole 6b is formed in a so that the mounting bolt 5h of the inflator 5 can be inserted. Further, a part of the cylindrical body is bulged linearly along the axis to bulge the portion 6c.
The opening 6d is formed in the vicinity of the open end of the bulging portion 6c, and the inside of the bulging portion 6c forms a substantially rectangular space that communicates with the opening 6d from the closed end.

The retainer 7, which is one of the most important members in the present invention, is a ring-shaped member that fits on the end surface of the large-diameter main body 5a of the inflator 5. That is, peripheral wall portions 7b and 7c are vertically provided in the same direction on the inner peripheral edge and the outer peripheral edge of the flat plate ring body 7a, and the diameter of the inner peripheral wall portion 7b is substantially the same as the diameter of the recess 5d of the large-diameter main body 5a. , Outer peripheral wall 7c
Is substantially the same as the diameter of the flange of the large-diameter main body 5a. A plurality of screw insertion holes 7d are formed in the flat plate ring body 7a.

The air bag 4 applied to this embodiment is the same as the conventional one in terms of material, and has a perfect bag shape in which two circular woven fabrics of nylon fiber are combined and the outer periphery is sewn together. As shown in FIG. 3, a vent hole 4a is formed in the inflated airbag 4 for venting air at a predetermined speed when an external pressure acts. The vent hole 4a is formed slightly larger than the maximum diameter of the inflator 5, so that the inflator 5 can be easily inserted through the vent hole 4a when the inflator 5 is housed inside the airbag 4 when the airbag device is assembled. it can. Further, in the airbag 4, a lead wire insertion hole 4b for drawing out a lead wire extending from the inflator 5 and the inflator 5 are provided.
Mounting bolt insertion hole 4 for inserting the mounting bolt 5h of
c is provided, and a plurality of screw insertion holes 4d are formed around the lead wire insertion hole 4b.

The base plate 2 is an inflator support surface 2
a, the air bag support surface 2b and the slope 2c between these two surfaces are upper surfaces, and a rectangular box shape having a peripheral wall portion 2d extending vertically downward from the peripheral edge is formed, and the peripheral wall portion 2d has a boss plate attachment piece 2e. And a plurality of fixing holes 2f are also formed. A fixing member 2g for fixing and supporting the inflator 5 is fixed to the inflator supporting surface 2a by riveting, welding or the like.
It is attached to one. The fixing members 2g are a pair of brackets 2 for fixing and supporting both ends of the inflator 5.
h, 2i and the distance between both brackets 2h, 2i is the same as the length of the inflator 5 plus the thickness of two woven fabrics of the airbag 4. A lead wire insertion hole 2j for drawing out the lead wire 50 of the inflator 5 is formed in the center of one bracket 2h, and a plurality of screw holes 2k are formed around the lead wire insertion hole 2j. A wedge-shaped notch 2m is formed in the other bracket 2i, and a mounting bolt of the inflator 5 is fitted to the closed end of the wedge-shaped notch 2m.

In order to assemble these constituent members into the airbag module 1, first, the small-diameter main body 5b of the inflator 5 having a long cylindrical shape is housed in the rectifying member 6, and the mounting bolt 5 is attached.
h is projected from the mounting bolt insertion hole 6b of the rectifying member 6. In this state, the inflator 5 and the rectifying member 6 are inserted into the airbag 4 through the vent hole 4a. The mounting bolt 5h is projected to the outside from the mounting bolt insertion hole 4c of the airbag 4, and the lead wire 5 is led from the lead wire insertion hole 4b.
0 and the connector 51 are pulled out, the screw insertion hole 4d of the airbag 4 and the screw hole 5e of the inflator 5 are aligned, and the lead wire insertion hole 4b and the end surface of the large-diameter main body 5a are overlapped. Next, with the retainer 7 overlapped with the airbag 4 on the end surface of the large-diameter main body 5a, the screw insertion hole 7 of the retainer 7
d, the screw insertion hole 4d of the airbag 4, and the inflator 5
The screw holes 5e are aligned with each other and fitted to the end surface of the large-diameter main body 5a from above the airbag. Therefore, the periphery of the lead wire insertion hole 4b of the airbag 4 is surrounded by the inner peripheral wall portion 7b of the retainer 7.
And the outer peripheral wall portion 7c and the flange 5c and the concave portion 5d of the inflator 5 are bent and sandwiched.

Thus, the inflator 5 is placed in the airbag 4.
Also, the rectifying member 6 is attached and fixed to the base plate 2. At this time, the mounting bolt 5h protruding from the mounting bolt insertion hole 4c of the airbag 4 is fitted into the wedge-shaped notch 2m of the bracket 2i of the base plate 2, and the mounting bolt 5h is inserted from the outside of the bracket 2i via the washer 20. It is fixed by the nut 21. As the nut 21, a lock nut or the like that can be screwed into the mounting bolt 5h and that is elastically engaged and locked in a screw thread of the mounting bolt 5h by burying nylon resin or the like can be used. The bracket 2h at the other end has its screw hole 2k aligned with the screw insertion hole 7d of the retainer 7,
Secure with a plurality of screws 22. Then base plate 2
The airbag 4 is folded and placed on the airbag supporting surface 2b, the airbag cover 3 is covered from above, and the mounting frame portion 3a of the airbag cover 3 is fitted to the outside of the peripheral wall portion 2d of the base plate 2, The fixing holes 2f and 3d are aligned with each other, and the rivet 23 is inserted and fixed by caulking.

In the fixed state of the inflator 5 and the base plate plate 2, the mounting bolt 5h is formed at a position eccentric from the center of the inflator 5, and further, from the bracket 2h side, the bracket 2h and the retainer are attached. 7 and the inflator 5 are fixed to each other with the screw 22, the inflator 5 does not rotate with respect to the fixing member 2g of the base plate 2.

By thus forming the inflator 5 into the elongated cylindrical shape, the load of the bag 5 when the airbag 4 is deployed is supported over substantially the entire length of the inflator 5, so that the tensile stress of the airbag 4 is locally concentrated. It is not necessary to rigorously reinforce the various holes, which are also the mounting portion of the airbag 4, as in the conventional case, and the device can be made compact and the cost can be reduced.

Further, the inflator 5 has a long cylindrical shape,
The inflator 5 has base plates 2 at both ends thereof.
By adopting the structure of being fixed to the inside of the retainer 7, the periphery of the lead wire insertion hole 4b of the airbag 4 is sandwiched between the end surface of the large diameter main body 5a of the inflator 5 and the flat plate ring body 7a of the retainer 7, and Since the airbag 4 can be bent and sandwiched by the peripheral wall portion 7b and the outer peripheral wall portion 7c and the flange 5c and the recessed portion 5d of the inflator 5, the escape of gas at the fixed portion of the airbag 4 is prevented. Further, since the airbag 4 and the inflator 5 do not shift from each other, the base plate 2 that holds and fixes them together
The attachment to the base plate will be firm without loosening the screws that are fixed to the base plate or tightening the mounting bolts.

When the air bag is deployed, a large amount of inert gas is discharged instantaneously and in large quantities from the gas ejection port 5g that is unevenly distributed at the end of the inflator 5 lying upward.
Guides toward the center C ₂ of the horizontal crossing portion of the substantially H-shaped tear line 3c of the airbag cover 3, so that the airbag cover 3 can be smoothly deployed and the main airbag device The airbag 4 stored below can be inflated toward the abdomen and chest of the occupant at the initial stage of deployment, and the airbag 4 can be effectively deployed to protect the occupant.

Further, the center of gravity C _{1 of the} inflator 5 is located above the steering wheel 1 with respect to the rotation axis C ₀ of the steering shaft in the steering neutral state, and
Since the airbag 4 can be folded and stored from a position in contact with the inflator 5 to the lower side, the workability is better than that of the conventional flat disk-shaped inflator folded and the plurality of spokes 10b. Even if the standard steering wheel 1 is unevenly distributed downward, the weight balance is greatly improved and the operability is improved.

Next, a second embodiment, which is a modification of the first embodiment described above, will be described with reference to FIGS. 5 and 6. The airbag module 1'of the second embodiment also includes a base plate 2, an airbag cover 3, an airbag 4, an inflator 5 ', a rectifying member 6 and a retainer 7', and the structure and material of these members are substantially the same. Is substantially the same as the first embodiment, but the fitting structure of the inflator 5'and the retainer 7'is different. Hereinafter, the mating structure will be mainly described,
The same members are designated by the same reference numerals and the description thereof will be omitted.

FIG. 5 is an exploded perspective view in which the structure of the second embodiment of the airbag module of the present invention is partially omitted, and FIG. 6 is a sectional view of the fitting portion between the inflator 5'and the retainer 7 '. is there. The large-diameter main body 5a of the inflator 5'has a flange 5c on the end face thereof, and the central portion of the end face has a circular recess 5
d'is formed, and two lead wires 50, 50 connected to the starter inside the inflator (not shown) are drawn out from substantially the center of the recess 5d '. This recess 5
Threaded ridges 5d'-1 are intermittently formed on the wall surface of d ', and screw holes 5d'-2 are formed in the recess 5d' near the lead-out portions of the lead wires 50, 50.

The retainer 7'has wall portions 7b 'and 7c vertically provided in the same direction on the inner peripheral edge and the outer peripheral edge of the flat plate ring body 7a'. The inner peripheral wall portion 7b 'is formed with screw ridges 7b'-1, 7b'-2 on both sides thereof, and the screw ridge 7b'-1 formed on the outer peripheral surface is a large-diameter main body 5a.
The screw projection 5d'-1 formed on the wall surface of the recess 5d 'is screwed.

In order to assemble these constituent members into the airbag module 1 ', it is almost the same as in the first embodiment. First, the oblong inflator 5'is accommodated in the rectifying member 6 with its small diameter main body 5b. In this state, it is inserted into the airbag 4 through the vent hole 4a, the mounting bolt 5h is projected from the mounting bolt insertion hole 4c of the airbag 4, and the lead wire 50 and the connector 51 are pulled out from the lead wire insertion hole 4b. Lead wire insertion hole 4b of the airbag 4
And the recess 5d 'of the inflator 5'are overlapped with each other, and the screw protrusion 7b'-1 of the retainer 7'is screwed into the screw protrusion 5d'-1 of the recess 5d' with the airbag interposed. And sticks. Therefore, the lead wire insertion hole 4 of the airbag 4
The periphery of b is sandwiched between the retainer 7'and the end surface of the large-diameter main body 5a of the inflator 5 '.

In this manner, the inflator 5'and the rectifying member 6 are fixedly attached to the base plate 3 while the inflator 5'and the rectifying member 6 are mounted and fixed in the airbag 4. At this time, the mounting bolt 5h protruding from the mounting bolt insertion hole 4c of the airbag 4 is fitted into the wedge-shaped notch 2m of the bracket 2i of the base plate 2, and the inflator 5'and the rectifying member 6 are mounted between the brackets 2h and 2i. Place. Bracket 2
The screw hole 2k of h and the inner peripheral wall surface 7b 'of the retainer 7 are aligned with each other and fixed by the plug 8 from the outside of the bracket 2h. This plug 8 has a screw protrusion 7 of a retainer 7'on its outer periphery.
It is a cylindrical body having a screw protrusion 8a screwed into b'-2 and having a flange 8b at one end, and the cylindrical body is formed with a screw hole 8c which is fitted in the longitudinal direction thereof. After the plug 8 is screwed and fixed to the retainer 7 ', the screw hole 5d'-2 of the recess 5d' of the inflator 5'and the screw hole 8c of the plug 8 are aligned and fixed with the set screw 24,
The plug 8 and the inflator 5'are prevented from rubbing against each other in the rotating direction. Furthermore, from the outside of the bracket 2i at the other end,
The mounting bolt 5h is fixed by the nut 21 via the washer 20.

In this embodiment, the recess 5d 'of the inflator 5'is provided.
Differs from the first embodiment in that the inner peripheral wall surface 7b 'of the retainer and the retainer 7'are engaged with each other by screwing, and accordingly, as in the first embodiment, the periphery of the recess 5d of the inflator 5 and the retainer 7 are formed. It is not necessary to form a plurality of screw holes 5e and 7d in the flat plate ring body 7a and fix these to the base plate 2 with screws, and it is not necessary to form the screw insertion hole 4d in the airbag 4. Therefore, in the second embodiment, the first
In addition to the effects of the first embodiment, since the fastening means such as a screw does not fit into the holding surface of the airbag 8 held by the inflator 5'and the retainer 7 ', the same effect as in the first embodiment is achieved. The strength of the air bag 4 in the holding portion is improved.

In the above first and second embodiments, the airbag 4 is clamped and fixed by the end surfaces of the inflators 5, 6'and the retainers 7, 8 ', but, for example, the second
As a modified example of the embodiment, as shown in FIG. 7, the flange 5c 'on the end surface of the large diameter body 5a of the inflator 5'is formed into a tapered surface, and the outer peripheral wall surface 7c' of the retainer 7'is also formed into a tapered surface. The airbag 4 can be held by the flange 5c 'of the inflator 5'and the outer peripheral wall surface 7c' of the retainer 7 '.

Further, as shown in FIG. 8, the inflator 5 '
The flange 5c "of the end surface of the large diameter main body 5a is formed as a stepped surface, and the outer peripheral wall surface 7c" of the retainer 7'is also a stepped surface, and the flange 5c "of the inflator 5'and the retainer 7'are similarly formed.
With the outer peripheral wall surface 7c ″, the airbag 4 can be bent in a stepped shape and can be sandwiched.

According to these modifications, the inflator 5'is
With the retainer 7 ', the airbag 4 can be clamped more firmly, and the escape of gas at the same portion is further prevented, so that the airtightness of the airbag is improved.

[0042]

As described above, according to the airbag apparatus of the present invention, the oblong inflator is used as described above, and by mounting the inflator in the airbag, the end face shape of the inflator is changed. By holding the airbag together with the inflator by the retainer of the conforming shape, the airbag and the inflator are firmly fixed to each other to prevent gas leakage, and the airbag is not damaged at the mounting position when the airbag is inflated. And an ideal expansion form can be easily realized. Also, since the airbag is supported over substantially the entire length of the long cylindrical inflator,
The entire area of the support region can support the load when the airbag is inflated and deployed, and the airbag can be effectively inflated.

Further, it becomes possible to dispose the long cylindrical inflator on the upper part of the base plate, and at the same time, the folding accommodation space of the airbag can be simplified.
In addition to enabling automation of the work of storing the airbag in the airbag cover, the depth of the entire device can be reduced by effectively laying out the inflator so that the appearance is good and the visibility of instruments and the like is improved.

[Brief description of drawings]

FIG. 1 is a front view of a steering wheel equipped with a typical airbag device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II of the airbag device in FIG.

FIG. 3 is an exploded perspective view in which the structure of the airbag module of the first embodiment of the present invention is partially omitted.

FIG. 4 is a cross-sectional view of the assembled first embodiment.

FIG. 5 is an exploded perspective view in which the structure of the airbag module of the second embodiment of the present invention is partially omitted.

FIG. 6 is a sectional view showing a fitting structure of an inflator and a retainer according to a second embodiment.

FIG. 7 is a cross-sectional view showing another fitting structure of the inflator and the retainer.

FIG. 8 is a sectional view showing still another fitting structure of the inflator and the retainer.

[Explanation of symbols]

 1, 1'Airbag module 2 Base plate 2a Inflator support surface 2b Airbag support surface 2c Slope 2d Peripheral wall 2e Boss plate mounting piece 2f Fixing hole 2g Fixing member 2h, 2i Bracket 2j Lead wire insertion hole 2k Screw hole 2m Wedge notch 3 Airbag cover 3a Mounting frame part 3b Cleavage part 3c Tear line 3d Fastening hole 4 Airbag 5a Vent hole 4b Lead wire insertion hole 4c Mounting bolt insertion hole 4d Screw insertion hole 5, 5'Inflator 5a Large diameter main body 5b Small diameter main body 5c Flange 5d recessed part 5d'-1 screw protrusion 5d'-2 screw hole 5e screw hole 5f recessed part 5g gas ejection port 5h mounting bolt 6 rectifying member 6a closed end 6b mounting bolt insertion hole 6c bulging part 6d opening 8, 8'retainer 7a Flat plate ring body 7b, 7b 'peripheral wall portion 7 ′ -1 Screw protrusion 7b′-2 Screw protrusion 7c Outer peripheral wall portion 7c ′ Outer peripheral wall portion 7c ″ Outer peripheral wall portion 7d Screw hole 8 Plug 8a Screw protrusion 8b Flange 8c Screw hole 10 Steering wheel 10a Wheel ring 10b Spoke 20 Washers 21 Nuts 22 Screws 23 Rivet 24 Potato screws 50 Lead wire 51 Connector

Claims (4)

[Claims] 1. An airbag device comprising an inflator for ejecting gas, an airbag for inflating due to the gas ejected from the inflator, and a case body for accommodating the inflator and the airbag, which is fixed to a base plate. The inflator has an elongated cylindrical shape, and an airbag is sandwiched and attached by a retainer fitted to a peripheral edge of at least one end face of the inflator. 2. The inflator has a flange portion formed on the outer circumference of one end surface thereof, and a recess formed at the center of the end surface, and the retainer is formed of a flat plate-shaped annular body, and the inner circumference and the outer circumference thereof are the same. The airbag device according to claim 1, wherein peripheral wall surfaces are provided upright in each direction. 3. The retainer and one end surface of the inflator are fixed to each other with screws.
The airbag device as described in the above. 4. The retainer and one end surface of the inflator are integrally formed with threaded portions, respectively, and the retainer and the inflator are fixed to each other by these threaded portions. 1. The airbag device according to 1.