JP2003104157A - Occupant crash protection device of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve on workability in assembling, with airbag unit mounting rigidity secured in advance, and to prevent the spoilage of seat external appearance in the process of installing an airbag unit in a side of the seat. SOLUTION: For the storage of an airbag unit in a recess 4 formed in a side face of the seat 1, a decorative cover 20 to open upon airbag deployment is provided by the side face of the airbag unit, and the airbag unit is provided with a lower bracket 15 extending downward from the cover 20 and an upper bracket positioned on the inside of the cover 20. For the attachment of the airbag unit to the recess at two locations, at an upper and lower spots in the recess 4, the lower bracket 15 is inserted into an engagement section on the lower side of the recess wall and the upper bracket is fastened and fixed by a screw to the fixing section on the upper side of the recess wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle occupant protection device in which a recess is formed in a seat side of a vehicle such as an automobile and an airbag unit is housed in the recess.

[0002]

2. Description of the Related Art Conventionally, in vehicles such as automobiles,
In order to further enhance the protection function for passengers in the passenger compartment, a recess is formed in the side part of the seat (specifically, usually the side part of the seat back), and the airbag unit is stored in this recess. When a vehicle undergoes a so-called side impact (side impact), an airbag is deployed from the airbag unit between the seat side portion and the passenger compartment side wall portion, so that the impact input to the occupant is prevented. A so-called side airbag, which absorbs the occupant while restricting the lateral behavior of the occupant and further improves the protective function for the occupant, is well known and has already been put into practical use in part.

As is well known, the seat back in which the unit body of the side airbag is housed has a seat back shape in which a frame body (seat back frame) is used as a skeleton and the periphery thereof is covered with a soft urethane foam having high elasticity. And the outer surface of this urethane foam is covered with a skin material (sheet cover).

When the unit body of the side airbag is stored in the side portion of the seat, during the manufacturing process of the seat,
In other words, as the final step, the airbag unit is installed in the recess on the side of the seat before the work of covering the skin material.
Conventionally, it is general. In other words, conventionally, it is general to assemble the airbag unit so as to be embedded (embedded) in the side portion of the seat during the seat manufacturing process. Then, at the time of a side collision, the seam (or the seam) provided on the outer skin is broken to deploy the airbag.

[0005]

However, in the above-mentioned conventional method, the assembling work of assembling the airbag unit to the side portion of the seat is incorporated in the middle of the basic seat manufacturing process. Since the assembling work itself is not good in workability and the sheet manufacturing process is complicated as much, it is difficult to improve the work efficiency during sheet manufacturing. Further, since it is necessary to provide a seam on the seat surface portion corresponding to the airbag deployment portion, there is a problem that the appearance is not good.

Although not particularly aware of such a problem, for example, in Japanese Unexamined Patent Publication No. 10-226303, the airbag unit is fixed to a resin-made back garnish that is attached to the back of the seat back afterwards.
A configuration is disclosed in which the airbag unit is stored in a recess on the side of the seat back by attaching the back garnish by retrofitting from the back side of the seat after completing the basic manufacturing process of the seat. . According to this configuration, it is possible to assemble the airbag module from the outside of the seat, so that the assembly workability can be improved.

However, in the case of this prior art, the airbag unit is fixed not to the seat side but to the back garnish made of resin having low strength and rigidity,
The mounting strength and rigidity are not sufficient, and there is a possibility that the deployment operation of the airbag may become unstable.

Therefore, according to the present invention, when the airbag unit is provided on the side portion of the seat, the assembling workability can be improved while securing the mounting rigidity of the airbag unit, and the appearance of the seat is impaired. The purpose of the present invention is to provide an occupant protection device for a vehicle that does not have a vehicle.

[0009]

Therefore, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) has a recess formed in the side portion of the seat, and the airbag unit is housed in the recess. In the vehicle occupant protection device configured as described above, a cover body capable of performing an opening operation when the airbag is deployed is provided on an outer surface portion in the vehicle width direction of the airbag unit, and the airbag unit is more than the cover body. A lower mounting bracket extending downward and an upper mounting bracket located on the inner side in the vehicle width direction than the cover body are provided,
The lower mounting bracket is engaged with the insertion engaging portion provided on the lower wall portion of the recess, while the upper mounting bracket is screwed to the fixing portion provided on the upper side wall portion of the recess. The airbag unit is attached to the recess at least at two upper and lower attachment portions by fastening and fixing with.

The invention according to claim 2 of the present application (hereinafter,
A second invention) is a vehicle occupant protection device in which a recess is formed in a side portion of a seat and an air bag unit is housed in the recess, and a vehicle width direction outer surface part of the air bag unit. A cover body that can perform an opening operation when the airbag is deployed is provided, and the airbag unit includes a lower mounting bracket that extends downward from the cover body, and is located inside the cover body in the vehicle width direction. An upper mounting bracket is provided, and the lower mounting bracket is inserted into a hole provided in the lower end wall of the recess and fastened and fixed by a screw member before covering the seat skin material, while the upper side is mounted. By fastening and fixing the mounting bracket to a fixing portion provided on the upper side wall portion of the recess with a screw member, the airbag unit is attached to the recess at least at two upper and lower mounting portions. It is characterized by being attached.

The invention according to claim 3 of the present application (hereinafter,
In the first or second invention, a cap member that covers a portion of the upper mounting bracket that is fastened and fixed by a screw member is detachably provided in the cover member. The control means is provided for restricting the amount of movement from the cover body.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a seat according to a first embodiment of the present invention as viewed from the back side. As shown in the figure, the seat 1 includes a seat cushion 2 on which an occupant is seated, and a seat back 3 (back portion) attached to a rear end side of the seat cushion 2 via a reclining mechanism (not shown). Is configured as a basic element.

The seat 1 serves as an occupant protection device for further enhancing the function of protecting a seated occupant in the event of a side collision. Air bag) is incorporated. In order to incorporate such an airbag unit, a recess 4 having a predetermined size is formed on a side portion of the seat 1, specifically, a side portion of the seat cushion 3. The recess 4 opens toward the direction facing the vehicle interior side wall (rightward in FIG. 1) and preferably toward the vehicle rear side (obliquely downward left in FIG. 1).

2 to 5 show the airbag unit 10 and the cover body 20 (decorative cover) thereof which are assembled in the recess 4. As shown in FIG. The decorative cover 20 is provided on the outer surface of the airbag unit 10 in the vehicle width direction in order to prevent the airbag unit 10 from coming into direct contact with the outside of the seat 1, and as described later, the airbag is deployed. Sometimes
The expansion pressure allows the smooth opening operation. The decorative cover 20 is integrally assembled with the airbag unit 10 to form an airbag device assembly 9. The structure for attaching the decorative cover 20 to the airbag unit 10 will be described later.

As can be seen from FIGS. 2 to 5, the airbag unit 10 includes a folded airbag 12 and an inflator 13 for operating the airbag 12 inside a case body 11 (unit case) thereof. It is built in and configured (mainly, refer to FIGS. 4 and 5).
On the back side of the airbag unit 10, the unit 10
The two positioning members 19 are provided so as to project a predetermined amount when assembling into the recess 4 on the side of the seat. In addition, this airbag unit 1
Since 0 itself is the same as that well known in the related art, detailed description and illustration of the details of its operation and individual components will be omitted.

An upper portion of a bracket 15 (lower bracket for lower mounting) extending below the decorative cover 20 is fixed to the lower portion of the rear side of the unit case 11 of the airbag unit 10 by welding, for example. There is. Further, the bracket 1 located on the rear side upper portion of the unit case 11 is located on the inner side in the vehicle width direction of the decorative cover 20 within a range not protruding from the decorative cover 20.
The lower part of 6 (upper bracket for mounting on the upper side) is fixed by welding, for example. This upper bracket 1
A through hole 16h for inserting the fixing bolt 31 (see FIG. 1) is provided near the upper end of 6.

Through hole 16h of the upper bracket 16
Corresponding to the above, the decorative cover 20 is formed with an opening 20h having a size suitable for insertion and tightening work of the fixing bolt 31. The opening 20 is closed by a detachable cap 21 having a substantially flat plate shape after the assembling work of the airbag unit 10 is completed. Therefore, after the upper bracket 16 is fixed by the fixing bolt 31, the fixed portion is covered with the cap 21 and is not visible from the outside, and the appearance of the seat 1 is not deteriorated.

As shown in FIG. 6, the cap 2
1, a leg portion 22 having a locking portion 22c at its tip is integrally formed. The locking portion 22c of the leg portion 22 is fixed to an appropriate position on the back surface side of the decorative cover 20, for example, by using a screw member (not shown). Therefore, even when a large external force is applied to the decorative cover 20, for example, when the decorative cover 20 is opened when the airbag 12 is deployed, the movement amount of the cap 21 from the decorative cover 20 is reliably regulated and the cap 21 scatters. Can be reliably prevented, and safety can be further improved.

FIG. 7 shows a modification of the cap 21. In the cap 21 ′ according to this modification, the leg 2
An arrow-shaped locking portion 22c 'is provided at the tip of 2 in a front view, and the arrow-shaped locking portion 22c' is fitted into a corresponding slot portion (not shown) formed in, for example, a decorative cover. As a result, the amount of movement of the cap 21 'when it falls is regulated.

FIG. 8 is a cross-sectional explanatory view showing a state in which the airbag device assembly 9 (the airbag unit 10 and the cosmetic cover 20) is mounted in the recess 4 on the side portion of the seat back 3, and FIGS. It is an expanded sectional explanatory view which expands and shows the important section typically. As shown in these drawings, the wall surface of the recess 4 on the side portion of the seat back 3 is preferably composed of a resin base plate 5, and the base plate 5 is a seat frame (not shown) of the seat back 3. (3) is fixed to the side plate 40 which is preferably made of a steel plate and constitutes a part of the above (1) by a plurality of rivets 49.

A lower mounting bracket 43 having an L-shaped cross section fixed to the side plate 40 is located on the rear surface side of the lower wall portion of the base plate 5 (see FIG. 8) and supports the lower mounting bracket 43. Between the surface and the lower wall of the base plate 5,
Slot portions 43s and 4s of a predetermined size are formed at portions corresponding to the vertical direction so that the lower end side of the lower bracket 15 of the airbag unit 10 can be inserted.

In the case of the slot portion 4s provided on the lower wall portion of the base plate 5, more preferably, the resin piece is pushed open by inserting the lower end portion of the lower bracket 15 instead of the slot opened from the beginning. In the pushed open state, the insertion portion of the lower bracket 15 is biased with the portion where the resin piece remains as the fulcrum of the hinge.

As a result, with the lower end side of the lower bracket 15 inserted into the slots 4s and 43s,
The rattling is suppressed. Further, preferably, the lower end side tip portion of the lower bracket 15 is inclined slightly outward so that it cannot be easily pulled out after being inserted into the slots 4s and 43s.

On the other hand, as shown in detail in FIG. 9, the base end portion of the upper mounting bracket 41 is fixed to the upper portion of the side plate 40 so as to be located on the back side of the base plate 5,
A nut 42 is fixed to the back side of the upper mounting bracket 41 by, for example, welding. This nut 41 is used when the airbag device assembly 9 is assembled.
Through hole 16h of upper bracket 16 and decorative cover 2
The position is set so as to correspond to the opening 20h of 0 in the horizontal direction. In addition, through holes are also formed at locations corresponding to the screw holes of the nut 42 of the base plate 5 and the upper mounting bracket 41.

When assembling the airbag unit 10 in the recess 4, first, the airbag unit 10 and the decorative cover 20 are assembled together to form the airbag device assembly 9. As shown in FIGS. 11 and 12, the back side of the decorative cover 20 is covered with the decorative cover 20.
A pair of upper and lower mounting leg portions 26 and a pair of front and rear mounting leg portions 27 are provided in a projecting manner in order to attach the vehicle to the airbag unit 10.

Engagement holes 26h are formed in the upper and lower mounting legs 26. By engaging the upper and lower ends of the unit case 11 of the airbag unit 10 with the holes 26h, The makeup cover 20 is assembled to the airbag unit 10. Although not specifically shown, the front and rear mounting legs 27 are also provided with engaging holes similar to those of the upper and lower legs 26. The rear mounting leg 27 will be described as an example. As shown in FIG. 13, a claw member 18 is projectingly provided on the rear surface of the unit case 11, and when the makeup cover 20 is assembled to the airbag unit 10. The claw member 18 is attached to the engaging hole portion 27 of the mounting leg portion 27.
It is adapted to engage with h.

Note that, as shown in FIG. 13, the inner surface side of the relatively rear portion of the decorative cover 20, more preferably, the inner surface side of the boundary portion between the curved surface portion and the planar portion in plan view,
A groove 25 extending vertically is formed, as shown in FIG.
As shown in, when the airbag 12 is inflated and deployed,
Due to the action of the expansion pressure, the front side (planar portion) of the decorative cover 20 is opened with the groove 25 as a fulcrum. That is, the groove portion 25 is a hinge portion for opening the decorative cover 20 (so-called PP hinge).
To play the role of.

As described above, the mounting leg portions 26 and 27 of the decorative cover 20 assemble the decorative cover 20 into the unit case 11 to form the airbag device assembly 9. In the present embodiment, after the basic manufacturing process of the seat 1 including the covering work for covering the urethane foam Ru with the skin material Fb (seat cover) is completed, the airbag device is retrofitted from the outside of the seat 1. The assembly work of the assembly 9 can be performed.

That is, as shown in FIG. 1, first, the lower end side of the lower bracket 15 is first inserted into the slot 4s of the lower wall portion of the recess 4 formed in the side portion of the seat back 3 from above to form the airbag. Fix the lower part of the device assembly 9. Next, the fixing bolt 31 is sequentially inserted through the opening 20h of the decorative cover 20 and the through hole 16h of the upper bracket 16 and screwed to the nut 42 fixed to the upper mounting bracket 41 of the side plate 40 of the seat back 3. And tighten. As a result, the upper portion of the airbag device assembly 9 is fastened and fixed.

After the airbag device assembly 9 is firmly fixed at the upper and lower two points in this manner, the opening 20h of the decorative cover 20 is closed by the cap 21 to complete the assembling work. Therefore, the fixed portion of the upper fixing bolt 31 is not visible from the outside, and the appearance of the seat 1 is not impaired.

As described above, according to the present embodiment, in the airbag device assembly 9, the lower end side of the lower bracket 15 is inserted into the insertion slot 4s of the lower end wall of the recess 4 on the side of the seat back 3. While the upper bracket 16 is engaged with the fixing bracket (upper mounting bracket 41) provided on the upper side wall portion of the recess 4, the fixing bolt 3
By fastening and fixing with 1, the seat back 3 is attached to the recess 4 on the side.

That is, the airbag unit 10 can be attached from the outside of the seat 1 and after the basic manufacturing process of the seat 1 including the work of covering the seat cover Fb is completed (that is, retrofitting). Therefore, as compared with the conventional case where the airbag unit is assembled so as to be embedded in the side portion of the seat during the seat manufacturing process, the assembling work of the airbag unit 10 becomes easier and the workability thereof can be improved.

In this case, the airbag unit 1
Since 0 is directly incorporated in the recess 4 on the side portion of the seat back 3, its mounting rigidity can be sufficiently secured. Moreover, the seat cover Fs has seams (joint seams).
Since it is not necessary to form the sheet, the appearance of the sheet 1 is not impaired. Further, the airbag unit 10 is fixed to the recess 4 by mounting the lower and upper mounting brackets 1
Since it is performed through the components 5 and 16, it is possible to prevent the cosmetic cover 20 itself from becoming excessively large, and in this respect also, it is possible to suppress the influence on the sheet appearance.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the following description, components having the same configurations and performing the same actions as those in the above-described first embodiment are designated by the same reference numerals and further description is omitted. As can be seen from FIGS. 15 and 16, the airbag device assembly 59 according to the second embodiment is different from the airbag device assembly 59 in that the through hole 55h is formed in the vicinity of the lower end portion of the lower bracket 55. Basically, it is substantially the same as that 9 in the first embodiment. In addition, more preferably, the lower bracket 55 is formed to be slightly longer than that in the first embodiment, and the lower end side thereof is formed to be straight to the end without being inclined ( (See FIG. 17).

On the lower side of the side plate 40,
A base end portion of a lower mounting bracket 45 having a substantially closed cross section is fixed so as to be located on the rear surface side of the lower bracket 55 inserted from the slot 4s ′, and a nut 46 is fixed to the rear surface side by welding, for example. ing. This nut 4
When the lower bracket 55 is inserted from the slot 4s ′, the position 6 is set to correspond to the through hole 55h of the lower bracket 55 in the horizontal direction.

Through holes are also formed in the side plate 40 and the lower mounting bracket 45 at locations corresponding to the screw holes of the nut 46. Further, the urethane foam Ru on the side portion of the seat back 3 is also formed with a through hole 3h that opens laterally at a portion corresponding to the nut 46 in the horizontal direction so that the fixing bolt 32 can be tightened. Has been done.

In the present embodiment, after the basic manufacturing and assembling steps of the seat 1 are completed, the urethane foam Ru is covered by covering the seat back 3 from above (see the downward-pointing broken arrow in FIG. 15). At the end of the work of covering the skin material Fb (seat cover), the work of assembling the airbag device assembly 59 is performed from the outside of the seat 1. That is, as shown in FIG. 15, the seat cover covering work is interrupted in a state where the seat cover Fb is covered right above the insertion hole 3h on the side portion of the seat back 3, and the assembling work of the airbag device assembly 59 is performed. Done.

First, the lower end side of the lower bracket 55 is inserted from above into the slot 4s' of the lower wall portion of the recess 4 formed in the side portion of the seat back 3, and in that state, the fixing bolt 32 is attached. The insertion hole 3h and the through hole 55h of the lower bracket 55 are sequentially inserted, and the nut 46 fixed to the lower mounting bracket 45 of the side plate 40 is screwed and tightened. As a result, the lower portion of the airbag device assembly 59 is firmly fastened and fixed.

Next, the airbag device assembly 59.
Although the upper part of the fixing is performed, the structure and work of this fixing are the same as in the first embodiment. After the airbag device assembly 59 is fixed at the upper and lower two points in this way, the rest of the covering work of the seat cover Fb is restarted and the lower end portion of the seat back 3 is covered. The rest of the work of covering the seat cover Fb may be performed after the lower part of the airbag device assembly 59 is fixed and before the upper part of the airbag device assembly 59 is fixed.

As described above, also in the second embodiment, the airbag unit 10 can be assembled from the outside of the seat, so that the same effect as that of the first embodiment can be obtained. To be The different point is that the assembling work of the airbag device assembly 59 (that is, the airbag unit 10) in the recess 4 is not performed after the seat cover covering work is completely completed.
It is to be done with some remaining. In this respect, the first embodiment is superior in workability of assembly, but the second embodiment
In the case of the embodiment, the upper and lower two points are fastened and fixed, so that the attachment strength of the airbag unit 10 is further improved.

The present invention is not limited to the above-mentioned embodiments, and within the scope of the invention,
It goes without saying that various improvements and design changes are possible.

[0042]

According to the first invention of the present application, in the airbag unit, the lower mounting bracket is engaged with the insertion engaging portion of the recess lower end wall portion of the seat side portion while the upper mounting bracket is engaged. Is fastened and fixed to the fixing portion provided on the upper side wall portion of the recess with a screw member, and is attached to the recess of the seat side portion. That is, since the airbag unit can be attached from the outside of the seat and after the basic manufacturing process of the seat including the covering work of the seat skin material is completed (that is, retrofitting),
As compared with the case where the airbag unit is assembled so as to be embedded in the side portion of the seat during the seat manufacturing process, the work of assembling the airbag unit becomes easier and the workability thereof can be improved. In this case, since the airbag unit is directly incorporated in the recess on the side of the seat, it is possible to secure sufficient mounting rigidity. Moreover, since it is not necessary to form seams (seams) on the seat surface, the appearance of the seat is not impaired. Also,
Since the airbag unit is fixed to the recess via the lower and upper mounting brackets, it is possible to prevent the cover body itself from becoming excessively large, and this also affects the appearance of the seat. Can be suppressed.

According to the second invention of the present application, in the airbag unit, the lower mounting bracket is inserted into the hole provided in the recess lower end wall portion of the seat side before covering the seat skin material. While being fastened and fixed with a screw member, the upper mounting bracket is fastened and fixed with a screw member to a fixing portion provided on the upper side wall portion of the recess, whereby the upper mounting bracket is mounted in the recess on the side portion of the seat. Therefore, after the basic manufacturing process of the seat is almost completed, the fastening operation of the lower mounting bracket may be performed before the covering work of the seat covering material. That is, since the airbag unit can be attached from the outside of the seat at almost the end of the basic seat manufacturing process, conventionally, when the airbag unit is embedded in the side part of the seat during the seat manufacturing process. Compared with, the assembling work of the airbag unit becomes easier and the workability thereof can be improved. In this case, since the airbag unit is directly incorporated in the recess on the side of the seat, it is possible to secure sufficient mounting rigidity. Moreover, since it is not necessary to form seams (seams) on the seat surface, the appearance of the seat is not impaired. Moreover, since the airbag unit is fixed to the recess via the lower and upper mounting brackets, it is possible to prevent the cover body itself from becoming excessively large, and in this respect also, the seat appearance is improved. The effect of can be suppressed.

Further, according to the third invention of the present application, basically, the same effect as that of the first or second invention can be obtained. Moreover, since the cover member is detachably provided with a cap member that covers the fastening and fixing portion of the upper mounting bracket by the screw member, the fixing portion of the upper mounting bracket is not visible from the outside. The sheet appearance is not impaired. Further, since the regulation means for regulating the movement amount of the cap member from the cover body is provided, the cap member scatters even when a large external force acts on the cover body, for example, when the cover body opens when the airbag is deployed. Can be surely prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a seat according to a first embodiment of the present invention as viewed from the back side.

FIG. 2 is a side view of an airbag device assembly assembled in the recess of the seat.

FIG. 3 is a front view of the airbag device assembly as seen from the direction of the arrow Y3-Y3 in FIG.

FIG. 4 is a rear view of the airbag device assembly taken along the line Y4-Y4 in FIG.

5 is a plan view of the airbag device assembly as seen from the direction of the arrows Y5-Y5 in FIG. 2. FIG.

FIG. 6 is a front view of a cap of the makeup cover.

FIG. 7 is a front view showing a modified example of the cap.

FIG. 8 is a cross-sectional explanatory view showing a state in which the airbag unit and the decorative cover are attached to the recesses on the side of the seat back.

9 is an enlarged cross-sectional explanatory view schematically showing an enlarged main part of the assembled state of FIG.

FIG. 10 is an enlarged cross-sectional explanatory view schematically showing another main part of the assembled state of FIG. 8 in an enlarged manner.

FIG. 11 is a schematic explanatory view of the back side of the decorative cover.

12 is a cross-sectional explanatory view taken along the line Y12-Y12 of FIG.

FIG. 13 is an explanatory plan view schematically showing an assembled state of the airbag unit in the recess.

FIG. 14 is a plan explanatory view schematically showing a deployed state of the airbag.

FIG. 15 is a perspective view showing a seat according to a second embodiment of the present invention as viewed from the back side.

FIG. 16 is a front view of the airbag device assembly according to the second embodiment.

FIG. 17 is a cross-sectional explanatory view showing a state where the airbag unit and the decorative cover according to the second embodiment are assembled in a recess on a seat back side portion.

[Explanation of symbols] 1 ... sheet 3 ... Seat back 4 ... recess 4s, 4s' ... slot 9 ... Airbag device assembly 10 ... Airbag unit 12 ... Airbag 15, 55 ... Lower bracket 20 ... Makeup cover 21,21 '... Cap 22, 22 '... (cap) leg 22c, 22c '... Locking portion 31, 32 ... Fixing bolt 42 ... Nut Fb ... seat cover

Claims (3)

[Claims] 1. An occupant protection device for a vehicle, wherein a recess is formed in a side portion of a seat, and an air bag unit is housed in the recess, wherein an air bag is provided on an outer surface of the air bag unit in a vehicle width direction. A cover body that can perform an opening operation when deployed is provided, and the airbag unit includes a lower mounting bracket that extends below the cover body and an upper mounting position that is located inside the cover body in the vehicle width direction. And a lower bracket for engaging the lower engaging bracket provided on the lower end wall portion of the recess while the upper mounting bracket is provided on the upper side wall portion of the recess. The vehicle is characterized in that the airbag unit is attached to the recess at least at two upper and lower attachment portions by fastening and fixing to the fixed portion with a screw member. Occupant protection system. 2. An occupant protection device for a vehicle, wherein a recess is formed in a side portion of a seat and an airbag unit is housed in the recess, the airbag being provided on an outer surface of the airbag unit in a vehicle width direction. A cover body that can perform an opening operation when deployed is provided, and the airbag unit includes a lower mounting bracket that extends below the cover body and an upper mounting position that is located inside the cover body in the vehicle width direction. And a bracket for use in the lower mounting bracket, the lower mounting bracket is inserted into a hole provided in the lower wall of the recess and fastened and fixed with a screw member before covering the seat skin material, while the upper mounting bracket is mounted. Is fastened and fixed to a fixing portion provided on the upper side wall portion of the recess with a screw member, so that the airbag unit can be attached to the recess at least at two upper and lower mounting portions. Occupant protection device for a vehicle, characterized by being kicked. 3. A cover member is detachably provided on the cover body to cover a portion of the upper mounting bracket that is fastened and fixed by a screw member, and a capping means for restricting a movement amount of the cap member from the cover body. The vehicle occupant protection device according to claim 1 or 2, further comprising: