JPH10119684A - Air bag device mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting workability of an air bag device and reduce a cost. SOLUTION: An air bag lid 5 for an air bag device 3 is mounted on an inflater unit 4 to be movable to the vertical, cross and longitudinal directions, so that the inflater unit 4 and be inserted into the opening 2 on the upper face of an instrument panel 1, fastened and fixed to a steering member 9 and the air bag lid 52 can be fixed top the peripheral sedge of the opening 2 with a locking means 10 to mount the air bag device 3 in proper attitude across the steering member 9 and the peripheral edge of the opening 2 without using a special adjustment mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an airbag device for an automobile, and more particularly to a mounting structure of an airbag device disposed on a passenger side of an instrument panel.

[0002]

2. Description of the Related Art As is well known, an airbag device for a passenger seat of an automobile is inserted into an inside of the instrument panel through an opening formed in an upper surface portion of the instrument panel on the passenger seat side. The airbag device is fixed to an upper end of an inflator unit, and an airbag lid is fixedly attached to an opening edge of the opening. Since the opening is closed by fastening and fixing the inside of the instrument panel with fastening means such as screws, the airbag device is sub-assembled to the instrument panel, and the body of the instrument panel is At the time of assembling, the inflator unit is fastened and fixed to the steering member.

Further, as described above, the airbag device is attached to the periphery of the opening of the instrument panel and the steering member below it so as to straddle between two parts.
For example, as shown in Japanese Utility Model Application Laid-Open No. 6-78114, an adjusting mechanism adjusts a mounting angle and a mounting position in a vertical direction so that a proper mounting posture can be obtained.

[0004]

As described above, in order to sub-assemble a relatively heavy airbag device to the instrument panel, a metal frame member is attached to the periphery of the opening of the instrument panel. It is necessary to reinforce the periphery of the opening.

For this reason, the number of parts and the number of assembling operations including the above-mentioned adjustment mechanism are increased, which is disadvantageous in terms of cost, and a bracket portion for mounting a frame material is provided around the opening. Must be formed, the structure around the opening becomes complicated, and the formability of the instrument panel deteriorates.

Further, since the airbag device is sub-assembled to the instrument panel, the weight of the instrument panel is increased by the airbag device in addition to the large size of the instrument panel when the instrument panel is assembled to the vehicle body. When fixing the inflator unit to the steering member, the fastening work is performed from the lower side of the instrument panel while adjusting the mounting posture with the adjustment mechanism, in addition to the increase in the labor burden of the operator due to the increase in bulk. Therefore, workability is deteriorated.

Therefore, the present invention allows the airbag device to be assembled on the assembly line of the instrument panel to the vehicle body, and furthermore, it is possible to improve the mounting workability without the need to adjust the mounting posture, and to improve the parts workability. An object of the present invention is to provide an airbag device mounting structure that can reduce the number of points and can be obtained cost-effectively.

[0008]

According to the present invention, an air bag grid for closing an opening formed in an upper surface of an instrument panel is movably mounted on an inflator unit in a vertical direction, a horizontal direction, and a front-rear direction. Then, the inflator unit is inserted through the opening into the inside of the instrument panel, and is fixed to a steering member arranged in the vehicle width direction inside the instrument panel, and the air bag lid is fixed to the periphery of the opening. It is characterized by being attached via means.

According to a second aspect of the present invention, the air bag grid according to the first aspect includes a leg piece having an engagement hole on a lower surface of a front and rear side edge portion, while the inflator unit has front and rear portions of an upper portion thereof. A hook is provided on the surface for loosely hooking the engaging hole, and the airbag lid is movably attached to the inflator unit via the engaging hole and the hook.

According to a third aspect of the present invention, the fastening means according to the first and second aspects is provided on a lower surface of a peripheral edge portion of the air bag grid, and passes through a peripheral edge of the opening by pressing the air bag grid from above. It is a hook member engaged with the periphery of the opening.

According to a fourth aspect of the present invention, the steering member according to the first to third aspects includes a member-side bracket projecting obliquely downward and forward, while the inflator unit has the member at the bottom thereof. An inflator-side bracket is provided in contact with the side bracket, and the inflator unit is fastened and fixed diagonally from the lower side of the instrument panel via the member-side bracket and the inflator-side bracket.

According to a fifth aspect of the present invention, a flange for positioning the inflator unit in the left-right direction is formed on one of the member-side bracket and the inflator-side bracket.

According to a sixth aspect of the present invention, the steering member and the inflator unit according to the first to fifth aspects are provided with positioning means for mutually engaging and positioning the inflator unit in the front-rear direction and the vertical direction. It is characterized by.

According to a seventh aspect of the present invention, there is provided a member-side guide bracket, wherein the positioning means according to the sixth aspect is erected on a steering member substantially in parallel with an insertion direction of an inflator unit to be inserted from an opening, and an inflator unit. And an inflator-side guide bracket having a socket portion that is provided on the rear surface and is inserted and fitted into the member-side guide bracket from above.

According to an eighth aspect of the present invention, the inflator-side guide bracket according to the seventh aspect is provided with a guide slope portion extending downwardly and downwardly below the socket portion so as to be inclined forward and continuing to the bottom portion of the inflator unit. It is characterized by having.

According to a ninth aspect of the present invention, the socket portion according to the seventh and eighth aspects is configured such that a locking piece is formed at an upper end portion of the inflator-side guide bracket so as to be folded back to the rear side. The inclined guide piece is bent and formed at the lower end of the stop piece toward the rear obliquely downward.

According to a tenth aspect, the member-side bracket and the inflator-side bracket according to the seventh to ninth aspects are characterized in that a pair of right and left brackets is provided with the positioning means in the middle.

According to an eleventh aspect, the center of gravity of the inflator unit according to any one of the sixth to tenth aspects is set forward of the positioning means.

[0019]

According to the first aspect of the present invention, the inflator unit is fixed to the steering member, the airbag lid is fixed to the periphery of the opening of the instrument panel, and the airbag device is connected to the steering member and the instrument panel. The air bag grid is movably mounted to the inflator unit in the up-down direction, the left-right direction, and the front-rear direction, so that there is a mounting error between the air bag grid and the periphery of the opening and the inflator unit. The mounting error with the steering member can be absorbed by the displacement between the air bag grid and the inflator unit, and the air bag device can be mounted in a proper posture without using a dedicated adjusting mechanism.

Further, the airbag device is configured such that an inflator unit is inserted into an instrument panel mounted on a vehicle body from an opening in an upper surface portion thereof and fixed to a steering member. Since the instrument panel is mounted on the main line where it is mounted on the vehicle body, unlike the instrument panel with a sub-assembly of the airbag device, the weight of the instrument panel increases and the ease with which the instrument panel can be mounted on the vehicle body. Since there is no deterioration and no adjustment work of the mounting posture is required for mounting the airbag device, the workability of mounting the airbag device can be remarkably improved.

Furthermore, since the airbag device is not sub-assembled to the instrument panel, there is no need to provide a frame material for reinforcement around the opening of the instrument panel. There is no need to provide brackets for the instrument panel, which enhances the formability of the instrument panel and eliminates the need for a dedicated adjustment mechanism and frame material, thereby reducing the number of parts and assembly work, resulting in cost reduction. It can greatly contribute.

According to the second aspect, in addition to the effect of the first aspect, by hooking the hook piece of the inflator unit to the engaging hole of the leg piece of the airbag grid, the airbag grid can be movably connected to the inflator unit. Since it is assembled, the air bag grid and the inflator unit can be easily assembled.

According to the third aspect, in addition to the effects of the first and second aspects, the hook member is engaged with the peripheral edge of the opening simply by pressing the airbag lid against the peripheral edge of the opening of the instrument panel from above. As a result, the airbag lid can be attached with one touch, and the work of fixing the airbag lid to the periphery of the opening can be easily performed.

According to the fourth aspect, in addition to the effects of the first to third aspects, the inflator unit can be fastened and fixed to the steering member from an obliquely rear side below the instrument panel, so that the work can be performed below the instrument panel. The inflator unit can be attached to the steering member without forcing the user to take an unreasonable posture, and workability can be improved.

According to the fifth aspect, in addition to the effect of the fourth aspect, if the member-side bracket and the inflator-side bracket are rubbed with each other, the position of these brackets in the left-right direction is regulated by the flange, and the left-right direction of the inflator unit is adjusted. , The workability of attaching the inflator unit to the steering member can be further improved.

According to the sixth aspect, in addition to the effects of the first to fifth aspects, since the inflator unit can be positioned in the front-rear direction and the vertical direction by the positioning means, the workability of mounting the inflator unit to the steering member is further improved. Can be improved.

According to the seventh aspect, in addition to the effect of the sixth aspect, when the inflator unit is inserted from the opening of the instrument panel, the socket of the inflator-side guide bracket is inserted into the member-side guide bracket waiting in the insertion direction. Since the parts are inserted and fitted, the positioning operation of the inflator unit in the front-rear direction and the vertical direction can be easily performed.

Also, since the reaction force at the time of the back deployment operation of the airbag device is received by the guide bracket on the member side, the falling rigidity of the airbag device can be increased and the back deployment characteristics can be stabilized, and the sense of quality and reliability can be improved. Properties can be further improved.

According to the eighth aspect, in addition to the effect of the seventh aspect, when the inflator unit is inserted from the opening of the instrument panel, the socket portion is guided by the guide slope portion of the inflator-side guide bracket to move the socket portion to the member side. Since it can be inserted and fitted to the guide bracket, the socket portion and the member-side guide bracket can be smoothly inserted and fitted without generating a catch.

According to the ninth aspect, in addition to the effects of the seventh and eighth aspects, the socket portion is formed by folding back the locking piece on the upper end portion of the inflator-side guide bracket to the rear side. The socket portion can be easily formed, and the locking piece has an inclined guide piece at its lower end, so that the socket portion and the member side guide bracket can be inserted and fitted more smoothly. Can be made.

According to the tenth aspect, in addition to the effects of the sixth to ninth aspects, the member-side bracket and the inflator-side bracket are provided in a pair on each of the left and right sides with the positioning means in the middle. An inflator unit can be fixed to a steering member with good stability via an inflator-side bracket, and fastening work between the member-side bracket and the inflator-side bracket can be easily performed, and mounting stability of the inflator unit is improved. Can be.

According to the eleventh aspect, in addition to the effects of the seventh to tenth aspects, the inflator unit is inserted from the opening of the instrument panel, and the inflator-side guide bracket of the positioning means is provided on the steering member. When the inflator-side bracket is fixed on the member-side bracket that protrudes forward of the steering member, the engagement between the inflator-side guide bracket and the member-side guide bracket is caused by the weight of the inflator unit, and Since the engagement between the inflator-side bracket and the member-side bracket is ensured, the inflator unit can be temporarily fixed to the steering member, and the operator can move the inflator unit to the steering member without manually supporting the inflator unit. And it can be easily fastened, it is possible to further improve the assembling workability.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes an instrument panel, and an airbag device 3 is provided on an upper surface portion on a passenger seat side.
An opening 2 for assembling is formed.

The instrument panel 1 is mounted on the vehicle body on a main line for mounting outfitting parts on the vehicle body, and the airbag device 3 is mounted on the instrument panel 1 after mounting the instrument panel 1 on the vehicle body. Can be

The airbag device 3 includes an inflator unit 4 in which an inflator (not shown) and a folded back body are accommodated in a casing 4a, the inflator unit 4 mounted on the inflator unit 4, and the instrument panel 1
And an airbag lid 5 fixed to the peripheral edge of the opening 2 to close the opening 2.

The air bag grid 5 is movably mounted on the inflator unit 4 in the up-down direction, the left-right direction, and the front-back direction.

In this embodiment, a leg piece 6 having a plurality of engaging holes 7 on the lower side in the left and right direction is attached to the front and rear edges of the airbag grid 5 from the front and rear dimensions of the upper part of the inflator unit 4. The width and thickness of the plate are narrower than the engagement holes 7 on the front and rear surfaces of the upper part of the inflator unit, and the metal is loosely hooked in the engagement holes 7. A plurality of hook pieces 8 are fixed, and the upper part of the inflator unit 4 is inserted between the leg pieces 6 and 6 to make the leg pieces 6 and 6 circumscribe the front and rear hook pieces 8 and 8, respectively. The air bag grid 5 is movably mounted on the inflator unit 4 by dropping the air bag grids 8 and 7 into the engaging holes 7 and 7 and loosely hooking them, as described above.

The airbag device 3 is inserted into the opening 2 of the instrument panel 1 as described above, and the inflator unit 4 is fixed to the steering member 9 arranged in the vehicle width direction inside the instrument panel 1, and The airbag lid 5 is attached to the periphery of the opening 2 via fastening means 10, and is mounted across the steering member 9 and the periphery of the opening 2.

In this embodiment, the fastening means 10 integrally forms a rib piece 10a on the lower surface of the peripheral portion of the airbag lid 5, that is, on the lower surface of the left and right side edges and the lower surface outside the leg pieces 6 and 6 of the front and rear side edges. Then, the metal hook member 10 is attached to the rib piece 10a.
b is fitted and fixed, and the air bag grid 5 is pressed from above, whereby the hook member 10b passes through the peripheral edge of the opening 2 and is engaged with the peripheral edge. The air bag lid 5 may be integrally formed with a resin material, or the hook member 10b
Instead, the clip member may be attached to the periphery of the opening 2.

The inflator unit 4 is fastened and fixed by bolts and nuts 13 via a member-side bracket 11 joined and fixed to the steering member 9 and an inflator-side bracket 12 joined and fixed to the bottom of the inflator unit 4. The bracket 11 is provided to project obliquely downward and forward of the steering member 9, while the bottom surface of the inflator-side bracket 12 is formed to be inclined in accordance with the inclination of the member-side bracket 11. In a state in which the bracket 12 is fixedly mounted on the member side bracket 11, the brackets 11, 1 are obliquely rearward from the lower side of the instrument panel 1 so that an operator can take a comfortable working posture.
2 can be fastened and fixed by bolts and nuts 13.

The left and right edges of the member-side bracket 11 are formed by bending a flange 11a upward, and the flange 11a restricts the position of the inflator-side bracket 12 in the left-right direction, thereby positioning the inflator unit 4 in the left-right direction. Although it can be done, instead of bending the flange 11a on the member side bracket 11,
A flange for left and right positioning may be formed in the inflator side bracket 12 by bending.

The above-mentioned member-side bracket 11 and inflator-side bracket 12 are provided as a pair on each of the left and right sides with a positioning means 14 described later in the middle.

The positioning means 14 is for positioning the inflator unit 4 in the front-rear direction and the vertical direction. In this embodiment, the positioning means 14 is provided on the steering member 9 with reinforcing ribs 15a provided on the left and right side edges. An upright member-side guide bracket 15 and a socket portion 17 provided on the rear surface of the inflator unit 4 to be inserted into and fitted to the member-side guide bracket 15 from above.
And an inflator-side guide bracket 16 having

Above the upper surface of the instrument panel 1, a front window panel W / P is disposed in a rearwardly inclined state, and the inflator unit 4 has an opening 2 so as not to interfere with the front window panel W / P. The member-side guide bracket 15 inserts the socket portion 17 into the socket portion 17 so that the socket portion 17 can be inserted from above.
In order to facilitate the fitting, the inflator unit 4 is inserted upright from the opening 2 so as to be rearwardly inclined substantially in parallel with the insertion direction of the inflator unit 4.

On the other hand, the inflator-side guide bracket 1
6 is provided with a guide slope portion 18 which extends downwardly below the bracket portion 17 so as to be inclined downward and forward, and which is connected to the bottom portion of the inflator unit 4.

The socket portion 17 is formed by forming a locking piece 19 on the upper end of the inflator-side guide bracket 16 so as to be folded back. The lower end of the locking piece 19 has an inclined guide piece 19a. Are bent toward the rear obliquely downward, and when the inflator unit 4 is inserted from the opening 2 as described above, the socket section 17 and the member-side guide bracket are formed by the guide slope section 18 and the inclined guide piece 19a. 15 can be smoothly inserted and fitted without causing a catch.

The inflator unit 4 is fixed to the steering member 9 by the positioning means 14 and the member-side bracket 11 and the inflator-side bracket 12 as described above, and the center of gravity G is located forward of the positioning means 14. It is set as follows.

In FIGS. 1 and 2, reference numeral 20 denotes an energizing harness of the inflator unit 4, and reference numeral 21 denotes a vehicle body panel that separates the front side of the passenger compartment.

According to the structure of the above embodiment, when assembling the airbag apparatus 3 to the instrument panel 1, the instrument panel 1 is assembled to the vehicle body at the main line for assembling parts, and then the airbag is assembled. The inflator unit 4 of the device 3 is inserted into the opening 2 of the instrument panel 1 from above, the positioning in the front-rear direction and the vertical direction is performed by the positioning means 14, and the member side bracket 11 and the inflator side bracket 12 are overlapped. The inflator unit 4 can be firmly fixed to the steering member 9 by positioning the brackets 11 and 12 with bolts and nuts 13 by positioning the brackets 11 and 12 in the left-right direction with the flange 11a. Fastening means 1
0, the airbag device 3 can be attached across the steering member 9 and the peripheral edge of the opening 2 of the instrument panel 1 by fastening to the peripheral edge of the opening 2. The airbag lid 5 is closed by the airbag lid 5, and the airbag lid 5 can be flush with the upper surface of the instrument panel 1.

As described above, the airbag device 3 is inserted through the opening 2 of the instrument panel 1 and
The airbag lid 5 is attached to the inflator unit 4 in the up-down direction, the left-right direction, and the front-rear direction. Part 2
The mounting error between the periphery and the mounting error between the inflator unit 4 and the steering member 9 can be absorbed by the mutual displacement between the air bag grid 5 and the inflator unit 4, and the airbag device 3 can be used without using a dedicated adjustment mechanism. Can be mounted in a proper posture.

As described above, the airbag device 3 is mounted on the instrument panel 1 on the main line where the instrument panel 1 is mounted on the vehicle body.
Unlike the conventional one in which the airbag device 3 is subassembled, the weight of the instrument panel 1 is not increased, and the assemblability to the vehicle body is not deteriorated.
Since there is no need to adjust the mounting posture when mounting the airbag device, the workability of mounting the airbag device 3 can be significantly improved.

Further, since the airbag device 3 is not sub-assembled to the instrument panel 1, it is not necessary to provide a frame material for reinforcement around the periphery of the opening 2 of the instrument panel 1 as in the prior art. Since there is no need to provide a bracket for mounting the frame material on the periphery of the opening 2, the formability of the instrument panel 1 can be improved, and a dedicated adjustment mechanism and frame material are not required. In addition, the number of assembling work steps can be reduced, which can greatly contribute to cost reduction.

Here, the above-mentioned air bag grid 5 is loosely hooked with a hook piece 8 provided on the front and rear surfaces of the upper part of the inflator unit 4 in an engaging hole 7 of the front and rear leg pieces 6 so as to loosen. 5 can be movably assembled to the inflator unit 4, so that the air backgrid 5 and the inflator unit 4 can be easily assembled, and the air backgrid 5 is formed around the opening 2 of the instrument panel 1. The hook member 10b on the periphery of the lid is simply
The air bag grid 5 can be attached by one-touch by passing through the peripheral edge, and the air bag grid 5 can be easily attached to the peripheral edge of the opening 2 of the air bag grid 5.

On the other hand, the inflator unit 4 has an inflator-side bracket 12 provided at the bottom thereof, which is projected forward on the steering member 9 and overlaps the member-side bracket 11 which is inclined obliquely downward. From both sides of the bracket 11,
Since the bolts and nuts 12 can be fastened, the inflator unit 4 can be attached to the steering member 9 without forcing the operator to exert an unreasonable posture under the instrument panel 1, thereby improving workability. Can be improved.

The member-side bracket 11 is formed by bending a flange 11a upward on both left and right side edges thereof. The flange 11a restricts the position of the inflator-side bracket 12 in the left-right direction, and the left and right sides of the inflator unit 4 are controlled. Since the positioning in the direction can be performed, the workability of attaching the inflator unit 4 to the steering member 9 can be further improved.

In particular, when the inflator unit 9 is attached to the steering member 9, the member bracket 11 and the inflator bracket 12 are rubbed together to perform the positioning in the left-right direction, and the inflator unit 4 is mounted. When the member is inserted through the opening 2, the member-side guide bracket 15 of the positioning means 14 stands by in the insertion direction of the inflator unit 4, and the inflator-side guide bracket 1
6, the guide slope portion 18 comes into contact with the upper end of the member side guide bracket 15, and the socket portion 17 is guided by the guide slope portion 18 to be inserted and fitted into the member side guide bracket 15, and the inflator unit 4 The inflator unit 4 can be easily mounted on the steering member 9 in an appropriate mounting posture since the positioning in the front-rear direction and the vertical direction can be performed.

Further, since the socket 17 of the positioning means 14 is formed by folding back the locking piece 19 at the upper end of the inflator-side guide bracket 16, the socket 17 is easily formed. Since the lower end of the locking piece 19 is provided with an inclined guide piece 19a, the upper end of the member-side guide bracket 15 can be guided to the socket 17 by the inclined guide piece 19a. In addition to the guiding action by the guide slope portion 18, the insertion and the fitting of the socket portion 17 and the member-side guide bracket 15 can be performed more smoothly without causing a catch.

In addition to the positioning function of the inflator unit 4 in the front-rear direction and the up-down direction, the positioning means 14 also operates when the airbag device 3 is operated to deploy the back.
Since the reaction force can be received by the member side guide bracket 15 erected on the steering member 9 and the load can be borne by the steering member 9, the falling rigidity of the airbag device 3 can be increased and the back deployment characteristics can be stabilized. Quality and reliability can be further improved.

Further, since the center of gravity G of the inflator unit 4 is set forward of the positioning means 14, the member-side guide bracket 1 of the positioning means 14 is provided.
When the inflator-side bracket 12 is fixed on the member-side bracket 11, the member-side guide bracket 15 and the socket 17 are connected to each other by the weight of the inflator unit 4. Engagement and the engagement between the inflator-side bracket 12 and the member-side bracket 11 are reliably performed, and the inflator-side bracket 12 and the member-side bracket 11 are provided in a pair on each of the left and right sides with the positioning means 14 in between. Therefore, the inflator unit 1 can be fixed to the steering member 9 with good stability. Therefore, the operator can easily fasten and fix the inflator unit 4 to the steering member 9 without manually supporting the inflator unit 4. Workability can be further improved and the inflator It is possible to enhance the mounting stability of the knitted 4.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the airbag device and a steering member of the embodiment.

FIG. 3 is a front view of the airbag device shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument panel 2 Opening 3 Airbag device 4 Inflator unit 5 Airbag lid 6 Leg piece 7 Engagement hole 8 Hook piece 9 Steering member 10 Fastening means 10b Hook member 11 Member side bracket 14 Positioning means 15 Member side guide bracket 16 Inflator side guide bracket 17 Socket part 18 Guide slope part 19 Locking piece 19a Inclined guide piece

Claims (11)

[Claims] An airbag lid for closing an opening formed in an upper surface of an instrument panel is movably attached to an inflator unit in an up-down direction, a left-right direction, and a front-back direction, and the inflator unit is inserted from the opening into the instrument panel. Wherein the air bag is fixed to a steering member arranged in the vehicle width direction inside the instrument panel, and an air backgrid is attached to the periphery of the opening via fastening means. Mounting structure of bag device. 2. The airbag lid has leg pieces having engaging holes on the lower surface of front and rear side edges thereof, and the inflator unit has hooks which are loosely hooked on the engaging holes on the front and rear surfaces of the upper part thereof. 2. The mounting structure for an airbag device according to claim 1, wherein the airbag lid is movably mounted on the inflator unit through the engagement holes and the hook pieces. 3. The fastening means is a hook member provided on a lower surface of a peripheral portion of the airbag lid, the hook member passing through the peripheral edge of the opening by pressing the airbag lid from above and engaging with the peripheral edge of the opening. Claim 1, characterized in that
3. The mounting structure of the airbag device according to 2. 4. The steering member includes a member-side bracket that projects obliquely downward and forward, while the inflator unit includes an inflator-side bracket that abuts on the member-side bracket at the bottom thereof.
The mounting structure for an airbag device according to any one of claims 1 to 3, wherein the inflator unit is fastened and fixed from an obliquely rear lower side of the instrument panel via the member-side bracket and the inflator-side bracket. . 5. The mounting structure for an airbag device according to claim 4, wherein a flange for positioning the inflator unit in the left-right direction is formed on one of the member-side bracket and the inflator-side bracket. 6. The steering member and the inflator unit are provided with positioning means for mutually engaging and positioning the inflator unit in the front-back direction and the up-down direction. Mounting structure of the airbag device. 7. A member side guide bracket erected on a steering member substantially parallel to an insertion direction of an inflator unit to be inserted from an opening, and a positioning bracket provided on a rear surface of the inflator unit. 7. The mounting structure for an airbag device according to claim 6, wherein said mounting structure comprises an inflator-side guide bracket having a socket portion inserted and fitted from above. 8. The air supply according to claim 7, wherein the inflator-side guide bracket includes a guide slope portion extending downward and downward from the socket portion so as to be inclined forward and connected to a bottom portion of the inflator unit. Mounting structure of bag device. 9. The socket portion is formed by forming a locking piece on the upper end of the inflator-side guide bracket so as to be folded back, and the inclined guide piece is directed downward and rearward at the lower end of the locking piece. 9. The mounting structure for an airbag device according to claim 7, wherein the airbag device is bent. 10. The mounting structure for an airbag device according to claim 6, wherein a pair of member-side brackets and a pair of left and right inflator-side brackets are provided with positioning means in between. 11. The airbag device mounting structure according to claim 7, wherein the center of gravity of the inflator unit is set forward of the positioning means.