JP6842330B2 - Crew protection device - Google Patents

Description

The present invention relates to a device that protects an occupant seated in a seat in an automobile.

As a device for protecting an occupant seated on a seat in an automobile, there is a device using a seat belt or a front airbag (Patent Document 1).
The seat belt is generally a three-point type and has a wrap portion around the waist of the occupant seated on the seat and a shoulder portion that is hung in front of the upper body. Then, the seat belt is wound up by the retractor before the collision to reduce the slack, and the delivery of the seat belt is regulated at the time of the collision. As a result, the body of the occupant who is trying to move forward from the seat in the event of a collision can be operated to be held in a seated state.
The front airbag is provided on the steering wheel or dashboard provided in front of the seat in the passenger compartment and deploys backward toward the seat. Then, the upper body of the occupant who falls forward in the event of a collision is supported by the deployed front airbag to absorb the impact.

Japanese Unexamined Patent Publication No. 2010-235009

However, even if such an occupant protection device is used, it cannot be appropriately protected in all collision forms.
For example, even in a frontal collision, the occupant seated on the seat may move forward due to the impact of the collision. Then, when the lumbar region of the occupant slides forward from the seating position of the seat, the upper body that tries to fall forward around the lumbar region collapses forward from the state approaching the front airbag. It will be. In this case, the contact state between the front airbag and the upper body is different from that assumed when the lumbar region is in the seating position of the seat.

As described above, the occupant protection device is required to further improve the occupant protection performance.

The occupant protection device according to the present invention is a occupant protection device that deploys a seat airbag from the bottom to the top of the left-right central portion of the seat surface of the vehicle, and is located on the deployment top of the seat airbag. A cap portion is provided, and the seat air bag is deployed upward on the seat surface of the seat by deploying the cap portion upward, and the right thigh and left of the occupant seated on the seat. The cap portion is deployed between the thigh portion and has a shape folded in the left-right direction with the center of the plate member in the left-right direction as the top, and the seat air bag deployed upward is left and right. By starting to deploy so as to spread in the direction, it spreads in the left-right direction together with the seat air bag .

Preferably, the cap portion folded in the left-right direction expands in the left-right direction when the seat airbag is deployed at a predetermined high pressure.

Further, the occupant protection device according to the present invention is a seat surface that can be deployed in the left-right direction on the seat surface of the seat by deploying from the bottom to the top of the center portion of the seat surface of the vehicle in the left-right direction. An occupant protection device including an airbag, the seat airbag has a deployment upper portion that expands in the left-right direction on the seat and a deployment lower portion that expands below the deployment upper portion. If it is not possible to deploy it on the seat surface of the seat, the upper portion of the deployment may be deployed in the left-right direction under the seat surface of the seat.
Preferably, when the seat airbag cannot be deployed on the seat surface of the seat, the deployment of the deployment lower portion is stopped and only the deployment upper portion is deployed .

In the present invention, a cap portion is provided at the deployment top of the seat airbag that deploys from below the center portion of the seat surface of the vehicle in the left-right direction to above the seat surface. Then, the seat airbag is deployed upward with the cap portion facing up. As a result, the seat airbag that expands from the bottom to the top of the center of the seat in the left-right direction expands from the cap to the top of the seat, and the right thigh of the occupant seated on the seat from the cap. Can be deployed between the left thigh and the left thigh. For example, even if the space between the right thigh and the left thigh of the occupant seated on the seat before deployment is closed, the seat airbag is pushed from the cap portion between them to push the seat airbag to the right thigh. Can be deployed between the left thigh and the left thigh.
As a result, the seat airbag can be deployed in front of the occupant's lumbar region, the lumbar region can be pressed from the front by the deployed lumbar airbag, and the lumbar region can be held in the seating position of the seat. Then, for example, in the case of a frontal collision, the upper body of the occupant falls forward around the lumbar region stable in the seating position, and the behavior of the upper body of the occupant in the case of a collision approaches the desired one. By tilting the upper body forward around the waist where the upper body is in the seating position, the upper body can be suitably supported by the front airbag and the impact can be absorbed.

FIG. 1 is an explanatory diagram of an automobile to which the occupant protection device according to the embodiment of the present invention can be applied. FIG. 2 is an explanatory diagram of an example of occupant behavior in a full-wrap head-on collision. FIG. 3 is an explanatory view of an example in which the upper body of the occupant is tilted while the waist of the occupant is in the seating position of the seat. FIG. 4 is an explanatory diagram of the occupant protection device according to the first embodiment. FIG. 5 is an explanatory view of a deployed state of the seat airbag of FIG. FIG. 6 is a diagram illustrating a stored state of the seat airbag of FIG. 4 under the seat and a normal deployment procedure. FIG. 7 is a diagram illustrating a retracted state and a preliminary deployed state of the seat airbag of the second embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is an explanatory view of an automobile 1 to which the occupant protection device 10 according to the embodiment of the present invention can be applied.

The automobile 1 is an example of a vehicle. The automobile 1 has a vehicle body 3 in which the passenger compartment 2 is formed. The occupant room 2 is provided with two front seats 4 and a rear seat 4 which are provided facing forward in the occupant room 2 and on which an occupant sits. Doors 5 that are opened and closed for passengers to get on and off are provided on both the left and right sides of the passenger compartment 2. In front of the front seat 4, a dashboard 6 having a length corresponding to the left-right width of the passenger compartment 2 is provided. A center console 7 is provided between the two front seats 4.

By the way, in such an automobile 1, a device for protecting an occupant seated on the seat 4 is provided in the event of a collision with another automobile or the like.
FIG. 1 shows a seat belt 19 and a front airbag 16.
The seat belt 19 is generally a three-point type. The three-point seat belt 19 has a wrap portion around the waist of the occupant seated on the seat 4 and a shoulder portion that is hung in front of the upper body. Then, the seatbelt 19 is wound up by a retractor (not shown) to reduce the slack before the collision, and the delivery of the seatbelt 19 is regulated at the time of the collision. As a result, the body of the occupant who intends to move forward from the seat 4 in the event of a collision can be operated to be held in a seated state on the seat 4.
The front airbag 16 is provided on a steering wheel or dashboard 6 provided in front of the seat 4 in the passenger compartment 2 and deploys backward toward the seat 4. Then, the upper body of the occupant who falls forward in the event of a collision can be supported by the deployed front airbag 16 to absorb the impact.

However, even if such an occupant protection device 10 is used, it is not possible to appropriately protect the occupants in all collision modes.
For example, FIG. 2 is an explanatory diagram of an example of occupant behavior in a frontal collision.
When a frontal collision occurs while the occupant is seated on the seat 4, as shown in FIG. 2 (A), the occupant seated on the seat 4 exerts a force to move relatively forward due to the impact of the collision. ..
At this time, assuming that the occupant is not pressed by the seat belt 19, the waist portion of the occupant slides forward from the seating position of the seat 4 as shown in FIG. 2 (B).
Then, the occupant's lumbar region stops, for example, with the kneecap hitting the dashboard 6, and the occupant's upper body falls forward around the lumbar region at that position, as shown in FIG. 2 (C). Become.

On the other hand, FIG. 3 is an explanatory view of an example in which the upper body of the occupant is collapsed while the waist portion of the occupant is in the seating position of the seat 4.
The contact state of the upper body with the front airbag 16 in FIG. 2C is different from that assumed when the lumbar region is in the seating position, as is clear from the comparison with FIG. The occupant's upper body falls forward at a position close to the front airbag 16. The contact state between the deployed front airbag 16 and the upper body is different from that in the case where the lumbar region is assumed to be in the seating position of the seat 4. In this case, the deployed front airbag 16 may not be able to properly support the collapsed upper body and absorb the impact.
In addition, the upper body suddenly falls forward in a short time after the movement of the lumbar region has stopped.

As described above, the occupant protection device 10 is required to further improve the occupant protection performance.

FIG. 4 is an explanatory diagram of the occupant protection device 10 according to the first embodiment.

FIG. 4 shows the automatic driving control device 40 together with the occupant protection device 10. The automatic driving control device 40 includes an external image sensor 41, an automatic driving control unit 42, a steering actuator 43, a brake actuator 44, and a power source 45.
The vehicle exterior image sensor 41 images the front of the vehicle body 3, for example. Thereby, for example, another vehicle body approaching the traveling vehicle body 3 from the front can be imaged as an image.
The steering actuator 43 drives the steering device of the automobile 1 instead of the steering wheel.
The brake actuator 44 drives the braking device of the automobile 1 instead of the brake pedal.
The power source 45 is, for example, a gasoline engine or an electric motor.
The automatic driving control unit 42 automatically controls the traveling of the automobile 1. The automatic driving control unit 42 controls the steering actuator 43, the brake actuator 44, and the power source 45 according to, for example, travel route information to the destination. Further, the automatic driving control unit 42 identifies an approaching object based on the image of the vehicle exterior image sensor 41 and predicts a collision with the approaching object. Then, when a collision with an approaching object is predicted, the automatic driving control unit 42 controls the steering actuator 43, the brake actuator 44, and the power source 45 so as to avoid the collision.

The occupant protection device 10 of FIG. 4 includes an occupant position sensor 11, a G sensor 12, a timer 13, an occupant protection control unit 14, a front airbag device 15, a three-point seatbelt device 18, and a seat airbag device 20.

The occupant protection control unit 14 includes an external imaging sensor 41, an automatic driving control unit 42, an occupant position sensor 11, a G sensor 12, a timer 13, a front airbag device 15, a three-point seatbelt device 18, a seat airbag device 20, and the like. Is connected.

The occupant position sensor 11 detects the position of the head or the position of the upper body of the occupant seated on the seat 4. For example, the occupant position sensor 11 detects the amount of movement in the forward direction or the amount of movement in the left-right direction with reference to the seating position on which the seat 4 is backed.

The G sensor 12 detects the acceleration acting on the automobile 1. The direction of the detected acceleration may be the front-back direction, the left-right direction, or the up-down direction.

The timer 13 measures the time or time.

The front airbag device 15 is provided in front of an occupant seated on the seat 4. The front airbag device 15 is provided on, for example, a dashboard 6 or a steering wheel. The front airbag device 15 includes a front airbag 16 and an inflator 17. When the ignition signal is input, the inflator 17 releases gas into the front airbag 16. As a result, the front airbag 16 is deployed rearward toward the occupant seated in the seat 4. The front airbag 16 is deployed in front of the occupant's upper body.

The three-point seat belt device 18 has a seat belt 19. The seat belt 19 has a wrap portion provided around the lumbar region of the occupant seated on the seat 4 by engaging a tongue (not shown) with the buckle, and one shoulder portion to the inside of the lumbar region of the upper body. It forms a shoulder part that is hung over the part. Then, when the pretension signal or the support signal is input, the retractor (not shown) winds up the seat belt 19. For example, the seatbelt 19 is wound up before the collision to reduce the slack, and the delivery of the seatbelt 19 is regulated at the time of the collision. As a result, the body of the occupant who intends to move forward from the seat 4 in the event of a collision can be held in a state of being seated on the seat 4.

FIG. 5 is an explanatory view of a deployed state of the seat airbag device 20 of FIG. 5 (A) is a front view and FIG. 5 (B) is a top view.
FIG. 6 is a diagram illustrating a stored state of the seat airbag device 20 of FIG. 4 under the seat 4 and a normal deployment procedure. FIG. 6A shows a state in which the sheet 4 is stored under the sheet 4. FIG. 6B shows a state in the middle of deployment. FIG. 6C shows an unfolded state.
The seat airbag device 20 includes a seat airbag 21, an inflator 24, an airbag body 25, and a cap portion 26.

As shown in FIG. 6, the airbag main body 25 is a housing provided under the seat surface of the seat 4 in the center front portion in the left-right direction so as to be stored under the seat surface of the seat 4.
The airbag body 25 is provided with a seat airbag 21 and an inflator 24.

The seat airbag 21 is provided on the airbag body 25. When an ignition signal is input and the inflator 24 releases gas into the seat airbag 21, the seat airbag 21 breaks the central front portion of the seat 4 in the left-right direction and from the seat 4 seat. Expand upwards.
The unfolded seat airbag 21 has an unfolded upper portion 22 and an unfolded lower portion 23, as shown in FIG.
The unfolding lower portion 23 is a deploying portion that is erected between the right thigh and the left thigh of the occupant seated on the seat 4 by expanding upward from the central front portion in the left-right direction of the seat surface of the seat 4.
The unfolding upper part 22 is a portion that unfolds from the upper end of the unfolding lower part 23 in the left-right lateral direction and unfolds on the right thigh and the left thigh. The unfolding upper part 22 is wider than the unfolding lower part 23 in the left-right direction above the unfolding lower part 23.
Further, the seat airbag 21 is folded and stored in the airbag main body 25 in a state of being stored under the seat surface of the seat 4 as shown in FIG. 6 (A).

As shown in FIG. 5, the cap portion 26 has a shape in which a long plate member in the left-right direction is folded in the left-right direction with the center in the left-right direction as the top. For example, the short sides of a pair of flat plate sheets may be connected to each other by a hinge.
Then, the cap portion 26 is attached to the unfolded top of the unfolded upper portion 22 of the seat airbag 21 so as to have an inverted V shape. As a result, the seat airbag 21 is deployed upward with the cap portion 26 facing up, and the cap portion 26 comes into contact with the seat surface of the seat from below.
Further, as shown in FIG. 6, the cap portion 26 is stored under the seat surface of the seat 4 in a state of being folded in the left-right direction. The cap portion 26 in a state of being folded in the left-right direction expands in the left-right direction when the seat airbag 21 is deployed at a predetermined high pressure. The cap portion 26 expands in the left-right direction together with the seat airbag 21 because, for example, the seat airbag 21 that has been deployed upward starts to expand in the left-right direction.
The cap portion 26 may be provided integrally with the seat airbag 21. For example, the cap portion 26 in a state of being folded in the left-right direction can be formed by knitting a tether or a fiber in a state where the unfolded top of the seat airbag 21 is bent in the left-right direction. In this case, the cap portion 26 can be opened in the left-right direction by applying a predetermined high pressure to the seat airbag 21.
Further, in order to open the cap portion 26 on the thigh, a partition may be provided between the deployment upper portion 22 and the deployment lower portion 23, and an active vent, a valve, a valve or the like may be provided in the partition portion. As a result, the active vent or valve can be opened after the unfolding lower part 23 is expanded to some extent, and the unfolding upper part 22 can be unfolded later than the unfolding lower part 23.

The occupant protection control unit 14 controls the operation of the occupant protection device 10 according to the traveling state of the automobile 1. Specifically, it controls the deployment of the front airbag device 15, the operation of the three-point seatbelt device 18, and the deployment of the seat airbag 21.

Next, the normal deployment operation of the seat airbag 21 will be described. In FIG. 6, the right thigh and the left thigh of the occupant seated on the seat 4 are shown. In FIG. 6A, the right thigh and the left thigh are aligned so as to be in contact with each other at the center of the seat 4 in the left-right direction.

As shown in FIG. 6A, before the collision, the occupant protection control unit 14 collides based on, for example, an image captured in front of the vehicle body 3 by the vehicle exterior image sensor 41 and traveling state information from the automatic driving control unit 42. Predict the possibility of. The traveling state information includes the steering amount of the steering actuator 43, the acceleration / deceleration amount of the brake actuator 44 and the power source 45, and the like. The occupant protection control unit 14 determines the traveling path of the vehicle body 3 based on this information. In addition, an object on or near the traveling path is specified based on the captured image in front of the vehicle body 3. The occupant protection control unit 14 determines the possibility of a head-on collision with an object based on this information. The automatic driving control unit 42 may execute these determinations, and the occupant protection control unit 14 may acquire the determination results from the automatic driving control unit 42.

Then, when there is a possibility of a head-on collision, the occupant protection control unit 14 starts the occupant protection control. In the occupant protection control, the occupant protection control unit 14 operates the seat airbag device 20.
The occupant protection control unit 14 outputs an ignition signal to the inflator 24. As a result, the seat airbag 21 starts to deploy.
As shown in FIG. 6B, the seat airbag 21 that has started to be deployed is deployed upward with the cap portion 26 facing up.
Then, the cap portion 26 in a state of being folded in the left-right direction breaks the seat surface of the seat 4 and projects onto the seat surface of the seat 4.

After that, as shown in FIG. 6C, the unfolding lower portion 23 of the seat airbag 21 projects onto the seat surface of the seat 4 and unfolds between the right thigh and the left thigh.
Further, the deployment upper portion 22 of the seat airbag 21 starts to deploy in the left-right lateral direction at the upper end of the deployment lower portion 23 protruding upward from the seat surface of the seat 4. As a result, the cap portion 26 that has been folded in the left-right direction opens in the left-right direction. As a result, the deployment upper portion 22 of the seat airbag 21 is deployed on the upper side of the right thigh and the upper side of the left thigh.
As a result, the lumbar region of the occupant who tries to slide forward on the seat surface of the seat 4 in the event of a collision is pressed from the front and above by the seat airbag 21. The lumbar region of the occupant is difficult to move from the seating position of the seat 4.

Next, when the occupant protection control unit 14 actually detects a head-on collision based on the acceleration signal of the G sensor 12, the front airbag device 15 is deployed. The occupant protection control unit 14 outputs an ignition signal to the inflator 17 of the front airbag device 15. As a result, the front airbag 16 is deployed backward from the front side of the seat 4.

After that, due to the impact input of the head-on collision, the occupant's upper body falls forward. As shown in FIG. 3, the occupant's upper body falls forward so as to rotate around the lumbar region maintained at the seating position of the seat 4.

In the above-mentioned occupant protection control, the seat airbag 21 may be deployed not from the timing when the possibility of a head-on collision is determined but from the timing when the head-on collision is actually detected.

As described above, in the present embodiment, the cap portion 26 is provided at the deployment top of the seat airbag 21 that deploys from below the center front portion of the seat 4 of the automobile 1 in the left-right direction to above the seat surface. .. Then, the seat airbag 21 is deployed upward with the cap portion 26 facing up. As a result, the seat airbag 21 that expands from the bottom to the top of the center front portion of the seat surface in the left-right direction expands from the cap portion 26 to the top of the seat surface, and is seated on the seat 4 from the cap portion 26. It can be deployed between the right and left thighs of the occupant. For example, even if the space between the right thigh and the left thigh of the occupant seated on the seat 4 is closed before deployment, the seat airbag 21 is pushed from the cap portion 26 between them to push the seat airbag 21 between them. Can be deployed between the right thigh and the left thigh.
As a result, the seat airbag 21 can be deployed in front of the occupant's lumbar region, the lumbar region can be pressed from the front by the deployed seat airbag 21, and the lumbar region can be held at the seating position of the seat 4. Then, for example, in the case of a frontal collision, the upper body of the occupant falls forward around the lumbar region stable in the seating position, and the behavior of the upper body of the occupant in the case of a collision approaches the desired one. By tilting the upper body forward around the waist where the upper body is in the seating position, the upper body can be suitably supported by the front airbag 16 to absorb the impact.

In the present embodiment, the cap portion 26 has a shape in which a long plate member in the left-right direction is folded in the left-right direction with the center in the left-right direction as the top. Then, the seat airbag 21 that has been deployed upward starts to expand in the left-right direction, so that the bent cap portion 26 expands in the left-right direction together with the seat airbag 21. Therefore, at the beginning of deployment, the seat airbag 21 is deployed upward in a state where the left and right width is narrow due to the shape folded in the left-right direction, and the seat airbag 21 is pushed between the right thigh and the left thigh. It can be made easy. Moreover, as the deployment of the seat airbag 21 progresses, the cap portion 26 expands in the left-right direction together with the seat airbag 21, so that the seat airbag 21 is deployed to the upper side of the right thigh and the upper side of the left thigh. Can be done. As a result, the seat airbag 21 can be deployed and pressed on the upper side of the right thigh and the upper side of the left thigh of the occupant seated on the seat 4. The lower limbs of the occupant are supported while sitting on the seat 4.

In the present embodiment, the cap portion 26 that has been folded in the left-right direction expands in the left-right direction when the seat airbag 21 expands to a predetermined high pressure. Therefore, the seat airbag 21 can be deployed in the left-right direction simply by deploying the seat airbag 21.
Further, even when the cap portion 26 does not expand on the seat surface of the seat 4, the internal pressure of the seat surface airbag 21 becomes a predetermined high pressure in that state. As a result, the seat airbag 21 can be deployed in the left-right direction in the seat 4 to push up the seat 4. As a result, the lumbar region of the occupant slides forward and becomes difficult to move.

[Second Embodiment]
Next, the occupant protection device 10 according to the second embodiment will be described. In the following description, the differences from the first embodiment will be mainly described, and the description overlapping with the first embodiment will be omitted.

FIG. 7 is a diagram illustrating a retracted state and a preliminary deployed state of the seat airbag 21 of the second embodiment. FIG. 7A is a front view before unfolding, and FIG. 7B is a front view after preliminary unfolding.
In the seat airbag 21 of FIG. 7A, the unfolding upper part 22 and the unfolding lower part 23 are formed as separate bag bodies and are sewn together in a vertically stacked state.
Then, the inflator 24 is individually connected to the unfolding upper part 22 and the unfolding lower part 23. An active vent or valve that opens when the unfolding lower part 23 becomes a predetermined pressure or more may be provided between the unfolding upper part 22 and the unfolding lower part 23.
Further, an on-off valve 27 is provided between the inflator 24 and the deployment lower portion 23.

The occupant protection control unit 14 starts occupant protection control when there is a possibility of a head-on collision. In the occupant protection control, the occupant protection control unit 14 outputs an ignition signal to the inflator 24 of the seat airbag device 20. As a result, the seat airbag 21 starts to deploy.
After that, the occupant protection control unit 14 monitors the deployed state of the seat airbag 21. Then, when the seat airbag 21 cannot be fully deployed, the occupant protection control unit 14 closes the on-off valve 27. As a result, in the seat airbag 21, only the unfolding upper portion 22 is unfolded under the seat surface at the front of the seat 4. As a result, as shown in FIG. 7B, the front portion of the seat surface of the seat 4 is lifted.

In this way, when the seat airbag 21 cannot be deployed on the seat 4, only the deployment upper portion 22 is deployed. The unfolding upper part 22 unfolds in the left-right direction in the seat 4. Therefore, as shown in FIG. 7B, even if the seat 4 is blocked by a skirt or the like and the seat airbag 21 cannot be deployed on the seat 4, the deployed upper portion 22 is deployed in the seat 4. By unfolding, the seat surface of the seat 4 can be pushed up. As a result, the lumbar region of the occupant seated on the seat 4 slides forward and becomes difficult to move.
In the present embodiment, when the seat airbag 21 cannot be deployed on the seat 4, the deployment upper portion 22 of the seat airbag 21 is deployed in the seat 4 in the left-right direction. In addition to this, for example, a bag body different from the seat surface airbag 21 may be provided, and the bag body may be expanded in the left-right direction in the seat 4.

The above embodiments are examples of preferred embodiments of the present invention, but the present invention is not limited thereto, and various modifications or modifications can be made without departing from the gist of the invention.

1 ... Automobile (vehicle), 2 ... Passenger room, 3 ... Body, 4 ... Seat, 5 ... Door, 6 ... Dashboard, 7 ... Center console, 10 ... Crew protection device, 11 ... Crew position sensor, 12 ... G sensor , 13 ... Timer, 14 ... Passenger protection control unit, 15 ... Front airbag device, 16 ... Front airbag, 17 ... Inflator, 18 ... Seatbelt device, 19 ... Seatbelt, 20 ... Seat airbag device, 21 ... Seat airbag, 22 ... upper deployment, 23 ... lower deployment, 24 ... inflator, 25 ... airbag body, 26 ... cap, 27 ... on-off valve, 40 ... automatic operation control device, 41 ... external imaging sensor, 42 ... Automatic operation control unit, 43 ... Steering actuator, 44 ... Brake actuator, 45 ... Power source.

Claims (4)

It is a occupant protection device that deploys the seat airbag from the bottom to the top of the center of the seat of the vehicle in the left-right direction.
A cap portion is provided on the deployment top of the seat airbag.
The seat airbag is deployed on the seat surface of the seat by deploying it upward with the cap portion facing up, between the right thigh and the left thigh of the occupant seated on the seat. Unfold and
The cap portion has a shape folded in the left-right direction with the center of the plate member in the left-right direction as the top, and the seat airbag that has been deployed upward starts to expand in the left-right direction. Spreads in the left-right direction together with the seat airbag.
Crew protection device. The cap portion folded in the left-right direction expands in the left-right direction when the seat airbag expands to a predetermined high pressure.
The occupant protection device according to claim 1. A occupant protection device including a seat airbag that can be deployed in the left-right direction on the seat surface of the seat by deploying from the bottom to the top of the center portion of the seat surface of the vehicle in the left-right direction.
The seat airbag is
An unfolding upper part that unfolds in the left-right direction on the sheet, and a unfolding lower part that unfolds below the unfolding upper part.
Have,
If it cannot be deployed on the seat surface of the seat, the upper part of the deployment is deployed in the left-right direction under the seat surface of the seat.
Crew protection device. When the seat airbag cannot be deployed on the seat surface of the seat, the deployment of the deployment lower portion is stopped and only the deployment upper portion is deployed.
The occupant protection device according to claim 3.