JP7227517B2 - vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a side airbag device.

There is known a vehicle seat equipped with a side airbag device that inflates and deploys an airbag provided on the side of the vehicle seat to protect an occupant in the event of a side collision of the vehicle. 1).

A vehicle seat having a rotatable armrest on its side is also known (see, for example, Patent Document 2 below).

Japanese Patent No. 5669567 JP 2007-229134 A

By the way, in a vehicle seat having an armrest, if a side airbag is provided on the same side surface as the armrest, the airbag and the armrest may interfere with each other when the airbag is deployed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat that can prevent interference when an airbag and an armrest are provided on the same side.

A vehicle seat according to the present invention includes a side frame that constitutes a side portion of a seat frame, an armrest that is rotatably provided with respect to the side frame, an airbag, and the armrest. an airbag module arranged side by side with the armrest in the front-rear direction of the seat behind the seat ; and a housing portion housing the airbag module. It has a breaking portion that breaks when it is expanded from the accommodating portion, and the breaking portion is formed vertically at the outer front end portion of the accommodating portion.

According to the vehicle seat described above, the airbag can be deployed outside the armrest. This can prevent interference when the airbag and the armrest are provided on the same side.

In the vehicle seat described above, it is preferable that the seat width direction outer surface of the armrest and the seat width direction outer surface of the accommodating portion are positioned substantially at the same position in the seat width direction.
This allows the airbag to deploy closer to the armrest. Also, the appearance of the seat can be improved.

The vehicle seat described above preferably includes a bracket attached to the side frame, and the accommodation section and the airbag module are attached to the bracket.
By doing so, it is possible to adjust the mounting positions of the housing portion and the airbag module.

In the vehicle seat described above, the side frame has a plate-like frame, and the plate-like frame has a flat side plate and a rear end extending inward from the rear end of the side plate. and the bracket is preferably attached to the rear end.
By doing so, the mounting workability of the bracket can be improved.

In the vehicle seat described above, the bracket includes a first attachment portion attached to the rear end portion, a rearward extension portion extending rearward from the first attachment portion, and a rear end of the rearward extension portion. and a second attachment portion extending outward from the seat to which the airbag module is attached.
By doing so, the airbag module can be provided outside and behind the side frames with a simple configuration.

In the vehicle seat described above, it is preferable that the airbag module is attached to a flat plate-like side plate of a plate-like frame of the side frame.
By doing so, it is possible to reduce the number of parts when attaching the airbag module to the outside of the side frame.

According to the present invention, interference can be prevented when an airbag and an armrest are provided on the same side.
According to the present invention, an airbag can be deployed near the armrest.
According to the present invention, the mounting position of the airbag module can be adjusted.
According to the present invention, it is possible to improve workability of attaching the bracket.
According to the present invention, the airbag module can be attached to the outside and to the rear of the side frame.
According to the present invention, it is possible to reduce the number of parts when attaching the airbag module to the outside of the side frame.

1 is a perspective view of a vehicle seat; FIG. 1 is a side view of a vehicle seat with armrests folded forward; FIG. 1 is a side view of a vehicle seat with armrests raised; FIG. 4 is a cross-sectional view along IV-IV in FIG. 3; FIG. It is a figure which shows the state which the airbag expanded. It is a figure explaining the attachment structure of the side airbag accommodating part in the vehicle seat which concerns on 2nd Embodiment.

A vehicle seat S as a vehicle seat according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to FIGS. 1 to 6. FIG.
The embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shape, size, arrangement, etc. of the members described below can be changed and improved without departing from the scope of the present invention, and the present invention naturally includes equivalents thereof.

In the following description, the term "longitudinal direction" means the longitudinal direction when viewed from a person seated in the vehicle seat, and is the direction that coincides with the running direction of the vehicle. The "seat width direction" means the width direction of the vehicle seat, and coincides with the left-right direction when viewed from the person seated in the vehicle seat. Further, the "height direction" means the height direction of the vehicle seat, and coincides with the vertical direction when the vehicle seat is viewed from the front.

First, an outline of each figure of FIGS. 1 to 6 will be described.
FIG. 1 is a perspective view of a vehicle seat S. FIG.
FIG. 2 is a side view of the vehicle seat S with the armrest 60 folded forward.
FIG. 3 is a side view of the vehicle seat S with the armrest 60 raised.
FIG. 4 is a sectional view along IV-IV in FIG.
FIG. 5 is a diagram showing a state in which the airbag 21 is inflated.
6A and 6B are diagrams illustrating a mounting structure of the side airbag housing portion 70 in the vehicle seat S according to the second embodiment.

As shown in FIG. 1, the vehicle seat S includes a seat back S1 that serves as a backrest portion, a seat cushion S2 that serves as a sitting portion, and a headrest S3 that is disposed above the seat back S1 and supports the occupant's head. .

The seatback S1 is constructed by covering a seatback frame 10 indicated by broken lines in FIG.

An armrest 60 is attached to the side portion (here, the left side portion) of the seat back S1. The armrest 60 is rotatable around the shaft portion 61 . Specifically, by rotating the armrest 60 about the shaft portion 61, the armrest 60 is tilted forward as shown in FIG. 2, and the armrest 60 is raised as shown in FIG. It is possible to switch between the housed state and the housed state.

A side airbag housing portion 70 housing the airbag module 20 is provided on the side of the seat back S1 to which the armrest 60 is attached.
Here, as shown in FIGS. 1 to 3 , the side airbag housing portion 70 is provided rearward of the seat from the armrest 60 .

Further, in the present embodiment, the side airbag housing portion 70 is configured in a substantially rectangular parallelepiped shape, and a cut portion 71 is formed in the vertical direction at the corner portion located at the outer front end portion of the side airbag housing portion 70 . The above-mentioned "outer front end portion" is a portion positioned at the outer end portion in the seat width direction and at the front end portion in the seat front-rear direction.
Note that the breaking portion 71 is an outlet from which the airbag 21 of the airbag module 20 housed in the side airbag housing portion 70 inflates. In other words, the breaking portion 71 is a tear line formed along the outer front end portion of the side airbag housing portion 70 .

[Description of Airbag Module 20]
The airbag module 20 is a device that absorbs the impact of a vehicle collision and protects the occupant. The airbag module 20 may be a caseless airbag module that does not have a module case, or may have a module case, and is not particularly limited.

In this embodiment, the airbag module 20 includes an airbag 21 and an inflator 22, and both the airbag 21 and the inflator 22 are wrapped and held by a wrapping material.
Here, the inflator 22 is a device that generates gas according to an input signal from a harness (not shown). Specifically, when a sensor provided in the vehicle detects a collision, an actuation signal is input to the inflator 22 via the harness, causing the inflator 22 to generate gas and inject the gas into the airbag 21 . do. In this way, the airbag 21 expands and deploys when the vehicle collides.

[Explanation of seat back frame 10]
Next, the configuration of the seatback frame 10 to which the airbag module 20 is attached will be briefly described. Note that the seat back frame 10 is a skeleton portion of the seat back S1 portion of the seat frame forming the skeleton of the vehicle seat S. As shown in FIG. That is, the seat back frame 10 is part of the seat frame.

As shown in FIG. 1, the seatback frame 10 includes an inverted U-shaped pipe frame 11, a pair of plate-shaped frames 12 forming ends in the seat width direction, and a pair of plate-shaped frames 12 between the lower ends of the pair of plate-shaped frames 12. and a lower frame 15 erected on.

An upper portion of the pipe frame 11 constitutes an upper frame 11A of the seat back frame 10. As shown in FIG.
The pipe frame side portion 11B of the pipe frame 11 and the upper end portion of the plate-like frame 12 are arranged so as to overlap each other in the vertical direction. Joined by welding.
In this embodiment, the side portion of the seatback frame 10 constituted by the pipe frame side portion 11B of the pipe frame 11 and the plate-shaped frame 12 is referred to as the side frame 13 .

[Mounting structure of armrest 60 and side airbag housing part 70]
Next, a structure for mounting the armrest 60 and the side airbag housing portion 70 to the side frame 13 (plate-shaped frame 12) will be described with reference to FIG.

First, the mounting structure of the armrest 60 will be described.
As shown in FIG. 4 , the armrest 60 is attached to the front portion of the plate-like frame 12 via a bearing fitting 90 .
Specifically, the bearing fitting 90 is attached to a portion of the side plate 12A of the plate-like frame 12 that is close to the front end portion 12B. The bearing fitting 90 has a flange portion 91 and a shaft attachment portion 92 .
The flange portion 91 is arranged inside the seat and is fixed by a fastener 95 such as a bolt while facing the side plate 12A of the plate-shaped frame 12 .
The shaft attachment portion 92 has a U-shaped cross section, and is attached to a surface arranged on the outside of the seat in a state in which the shaft portion 61 serving as the rotation axis of the armrest 60 is inserted.
Thus, the armrest 60 is rotatably attached to the seat back S1 about the shaft portion 61 as a central axis.

The bearing metal fitting 90 is surrounded by the first pad portion 40A, and the first pad portion 40A is covered with the front skin 50A.

Next, the mounting structure of the side airbag housing portion 70 will be described.
As shown in FIG. 4 , a bracket 80 having a crank-shaped cross section is attached to the rear end portion 12C of the plate-like frame 12 .
Specifically, as shown in FIG. 4 , the bracket 80 has a first mounting portion 81 , a rearwardly extending portion 82 and a second mounting portion 83 .

The first attachment portion 81 extends in the seat width direction and is fixed using a fastener 85 such as a bolt while facing the rear end portion 12C of the plate-like frame 12 .

The rearwardly extending portion 82 is a portion that extends rearwardly of the seat from the seat width direction outer end portion of the first mounting portion 81 .

The second attachment portion 83 is a portion that extends outward in the seat width direction from the rear end portion of the rear extension portion 82 in the seat front-rear direction. The second attachment portion 83 is formed with a through hole through which the stud bolt 22A extending from the inflator 22 of the airbag module 20 is inserted. Then, the inflator 22 and the bracket 80 are fixed using the fastener 84 in a state in which the stud bolt 22A is inserted through the through hole. The airbag module 20 is thereby fixed to the bracket 80 .

A slit is formed in the inner surface of the side airbag housing portion 70 in the seat width direction, into which the second mounting portion 83 of the bracket 80 is inserted. The side airbag housing portion 70 and the bracket 80 are fixed with the second mounting portion 83 of the bracket 80 being inserted into the side airbag housing portion 70 . As a result, the side airbag housing portion 70 and the airbag module 20 are attached to the side portion of the side frame 13 while the airbag module 20 is housed inside the side airbag housing portion 70 .

At a corner portion of the side airbag housing portion 70 located outside and in front of the seat, a breaking portion 71 is formed in the vertical direction. For example, the breaking portion 71 may be formed by forming a slit in the side airbag housing portion 70 .
In this way, as shown in FIG. 5, when the airbag module 20 is inflated, the airbag 21 expands the ruptured portion 71 and can be expanded into the space on the side of the vehicle seat S. . As a result, the airbag 21 can be inflated and deployed without interfering with the armrest 60 .

[Other embodiments]
The invention is not limited to the embodiments described above.
A vehicle seat S according to the second embodiment will be described below with reference to FIG. The second embodiment differs from the first embodiment in the mounting structure of the side airbag accommodating portion 70, but has the other configurations in common. Therefore, the mounting structure of the side airbag accommodating portion 70 will be described below.
6 is a cross-sectional view of the vehicle seat S according to the second embodiment at the same location as FIG. 4. As shown in FIG.

As shown in FIG. 6, the vehicle seat S according to the second embodiment is similar to the first embodiment in that the side airbag housing portion 70 and the airbag module 20 are attached to the side plates 12A of the plate-shaped frame 12. As shown in FIG. differ from
Specifically, in the second embodiment, a hole through which the stud bolt 22A of the inflator 22 is inserted is formed in the inner surface of the side airbag accommodating portion 70 in the seat width direction. The side plate 12A is also formed with a hole through which the stud bolt 22A of the inflator 22 is inserted.
After the stud bolts 22A of the inflator 22 are inserted through the respective holes of the side airbag housing portion 70 and the side plate 12A, the stud bolts 22A are fixed to the side plate 12A with fasteners 84 such as nuts. As a result, the side airbag housing portion 70 and the airbag module 20 are attached to the side portion of the side frame 13 while the airbag module 20 is housed inside the side airbag housing portion 70 .

Also, the side airbag accommodating portion 70 may be covered with an outer skin. In this case, the skin may be sutured at a position close to the rupture portion 71 so that the skin is torn at the rupture portion 71 as the airbag 21 is inflated.

Further, in the above embodiments, the vehicle seat is described as an example of a vehicle seat, but the present invention can also be applied to an airplane seat, a ship seat, and the like.

[Effects of Vehicle Seat S]
According to the vehicle seat S, the airbag can be deployed outside the armrest. This can prevent interference when the airbag and the armrest are provided on the same side.

In the vehicle seat S, the lateral side surface of the armrest in the seat width direction and the lateral side surface of the accommodating portion in the seat width direction are positioned substantially at the same position in the seat width direction.
This allows the airbag to deploy closer to the armrest. In addition, the appearance of the vehicle seat S can be improved.

The vehicle seat S includes a bracket 80 attached to the side frame 13 , and the side airbag housing portion 70 and the airbag module 20 are attached to the bracket 80 .
By doing so, the mounting positions of the side airbag housing portion 70 and the airbag module 20 can be adjusted.

In the vehicle seat S, the side frame 13 has a plate-shaped frame 12, and the plate-shaped frame 12 includes a flat side plate 12A, a rear end portion 12C extending from the rear end of the side plate 12A toward the inside of the seat, and a bracket 80 is attached to the rear end 12C.
By doing so, the mounting workability of the bracket 80 can be improved.

In the vehicle seat S, the bracket 80 includes a first attachment portion 81 attached to the rear end portion 12</b>C, a rear extension portion 82 extending from the first attachment portion 81 toward the rear of the seat, and a rear extension portion 82 . and a second attachment portion 83 extending from the end to the outside of the seat to which the airbag module 20 is attached.
By doing so, the airbag module 20 can be provided outside and behind the side frames 13 with a simple configuration.

In the vehicle seat S, the airbag module 20 is attached to the side plate 12A.
By doing so, the number of parts required for attaching the airbag module 20 to the outside of the side frame 13 can be reduced.

S Vehicle seat (vehicle seat)
S1 seat back S2 seat cushion S3 headrest 10 seat back frame (seat frame)
11 pipe frame 11A upper frame 11B side portion 12 plate frame 12A side plate 12B front end portion 12C rear end portion 13 side frame 14 cross member frame 15 lower frame 20 airbag module 21 airbag 22 inflator 22A stud bolt 40 seat pad 40A first Pad portion 40B Second pad portion 41 Weak portion 50 Outer skin 50A Front skin 50B Rear skin 60 Armrest 61 Shaft 70 Side airbag accommodating portion 71 Breaking portion 80 Bracket 81 First attachment portion 82 Rear extension portion 83 Second attachment portion 84 Fastener 85 Fastener 90 Bearing fitting 91 Flange portion 92 Shaft mounting portion 95 Fastener

Claims (6)

a side frame forming a side portion of the seat frame;
an armrest rotatably provided with respect to the side frame;
an airbag module that includes an airbag and is arranged behind the armrest in parallel with the armrest in the front-rear direction of the seat ;
and an accommodation portion that accommodates the airbag module,
The housing portion has a breaking portion that breaks when the airbag of the airbag module expands from the housing portion,
The vehicle seat, wherein the breaking portion is formed vertically at an outer front end portion of the accommodating portion. 2. The vehicle seat according to claim 1, wherein the outer surface of the armrest in the seat width direction and the outer surface of the accommodating portion in the seat width direction are positioned substantially at the same position in the seat width direction. comprising a bracket attached to the side frame;
2. The vehicle seat of claim 1, wherein said receptacle and said airbag module are attached to said bracket. The side frame has a plate-shaped frame,
The plate-shaped frame is
a flat side plate;
a rear end portion extending from the rear end of the side plate toward the inside of the seat;
4. The vehicle seat of claim 3, wherein said bracket is attached to said rear end. The bracket is
a first attachment portion attached to the rear end portion;
a rear extension portion extending rearward of the seat from the first attachment portion;
5. The vehicle seat according to claim 4, further comprising a second mounting portion extending outward from the rear end of the rearwardly extending portion and to which the airbag module is mounted. 2. The vehicle seat according to claim 1 , wherein the airbag module is attached to a flat side plate of a plate-like frame of the side frame .

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