JP2021062818A - Vehicle front center airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a front center airbag device for a vehicle which can contribute to suppressing inertial movement of an occupant toward the center side in the vehicle width direction at the time of a side collision. An FCAB device 10 includes an inflator 26 and an airbag 24 provided in a side portion 20A on the center side in the vehicle width direction of a seat back 20 of a vehicle seat 16A. The main chamber 28 of the airbag 24 expands and expands toward the front side of the vehicle in the side portion 20A by supplying gas to the inside. On the other hand, the sub-chamber 30 of the airbag 24 is configured to expand and expand between the main chamber 28 and the side portion 20A on the vehicle seat 16B side by supplying gas to the inside. As a result, when a load is input from the occupant P who intends to move to the center in the vehicle width direction due to the inertial force, a reaction force is applied from the seat back 20 of the vehicle seat 16B to the main chamber 28 via the sub-chamber 30. .. [Selection diagram] Fig. 4

Description

The present invention relates to a vehicle front center airbag device.

Patent Document 1 discloses an airbag device (front center airbag device) mounted on a side portion of a vehicle seat on the center side in the vehicle width direction in the seat back. In this front center airbag device, the airbag is fixed to the seat back frame. Further, the airbag includes a occupant restraint portion that expands to the front side of the vehicle on the side portion of the seat back when inflated, and a rear extension portion that expands to the rear side of the vehicle from a portion fixed to the seat back frame.

In the above configuration, the occupant who tries to move to the center side in the vehicle width direction at the time of a side collision is restrained by the occupant restraint portion. Further, when the occupant restraint portion is displaced to the side where the side collision occurs due to the load input from the occupant, the rear extension portion displaced to the seat back side due to the displacement of the occupant restraint portion is repelled from the seat back component. Gain power. As a result, the displacement of the occupant restraint portion is suppressed, so that the inertial movement of the occupant toward the center in the vehicle width direction is suppressed.

Japanese Unexamined Patent Publication No. 2015-10373

However, in the technique described in Patent Document 1, when it is difficult to provide a rear extension portion having a sufficient size, the reaction force applied to the rear extension portion by the seat back component member is reduced. It may affect the occupant restraint performance by the airbag.

In consideration of the above facts, an object of the present invention is to obtain a vehicle front center airbag device that can contribute to suppressing the inertial movement of the occupant toward the center side in the vehicle width direction at the time of a side collision.

The vehicle front center airbag device according to claim 1 is provided in the side portion of at least one of the driver's seat and the passenger seat on the center side in the vehicle width direction, and generates gas when activated. An inflator to be used, a first bag housed in the side portion of the driver's seat or the passenger seat, and expanded and deployed toward the front side of the vehicle by supplying the gas to the inside, and the driver's seat or the driver's seat or A second bag that is housed in the side portion of the passenger seat and expands and expands between the first bag and the side portion on the side where the first bag is not housed by supplying the gas inside. And have.

In the vehicle front center airbag device according to the first aspect of the present invention, for example, when a side collision of the vehicle is detected, the inflator is activated. Then, the gas generated from the inflator is supplied to the inside of the first bag and the second bag housed in the driver's seat or the passenger seat. For example, when the first bag is provided in the driver's seat, the first bag expands and expands toward the front side of the vehicle on the side of the driver's seat on the center side in the vehicle width direction. On the other hand, the second bag expands and expands between the first bag and the side portion of the passenger seat back on the center side in the vehicle width direction. As a result, when a load is input to the first bag from an occupant who intends to move to the center side in the vehicle width direction due to inertial force, a reaction force is applied from the passenger seat back to the first bag via the second bag. To. As a result, the first bag is prevented from falling toward the passenger seat side, and the occupant who is trying to inertially move toward the center side in the vehicle width direction is restrained by the first bag.

As described above, the vehicle front center airbag device according to claim 1 has an excellent effect that it can contribute to suppressing the inertial movement of the occupant toward the center side in the vehicle width direction at the time of a side collision. Have.

It is a side view of the vehicle seat on which the vehicle front center airbag device which concerns on 1st Embodiment is mounted, and is the figure of the state in which the airbag is expanded and expanded. FIG. 5 is an enlarged cross-sectional view showing an enlarged state of being cut along line 2-2 of FIG. (A) is a developed view of the subchamber shown in FIG. 1, and (B) is a perspective view schematically showing a state in which the subchamber is sewn to the main chamber. It is a plan sectional view for demonstrating the occupant restraint performance by the front center airbag device for a vehicle at the time of a side collision of a vehicle. It is a figure which shows the front center airbag device for a vehicle which concerns on 2nd Embodiment, and is the plan sectional view which corresponds to FIG. It is a side view of the vehicle seat on which the vehicle front center airbag device which concerns on 3rd Embodiment is mounted, and is the figure of the state in which the airbag is expanded and expanded. (A) to (C) are schematic views for explaining the behavior of the check valve shown in FIG.

Hereinafter, a vehicle equipped with the vehicle front center airbag device (hereinafter, referred to as “FCAB device”) 10 according to the first embodiment will be described with reference to FIGS. 1 to 4. The arrow FR appropriately shown in each figure indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow RH indicates the right side of the vehicle. In the following description, when the front-rear, up-down, and left-right directions are used without special mention, the front-rear direction of the vehicle front-rear direction, the up-down direction of the vehicle up-down direction, and the left-right direction when facing the traveling direction shall be indicated.

Further, in FIG. 1, a dummy for a crash test is shown instead of the actual occupant, and this dummy is, for example, an AM50 (American adult male) of the International Unified Side Collision Dummy (World SID). 50th percentile). In the following description, the dummy will be referred to as "occupant P".

(overall structure)
As shown in FIGS. 1 and 4, the front chamber 14 of the vehicle is provided with a pair of vehicle seats 16 arranged along the vehicle width direction. The vehicle is a right-handed vehicle, the vehicle seat 16 arranged on the right side in the vehicle width direction is the vehicle seat 16A as the driver's seat, and the vehicle seat 16 arranged on the left side in the vehicle width direction is the passenger seat. It is said to be the vehicle seat 16B.

The vehicle seats 16A and 16B include a seat cushion 18 on which an occupant sits, a seat back 20 that is tiltably supported at the rear end of the seat cushion 18, and a headrest 22 connected to the upper end of the seat back 20. It has.

The FCAB device 10 is mounted on a side support portion 20A (hereinafter referred to as "side portion 20A") on the center side in the seat width direction of the seat back 20 of the vehicle seat 16A.

(FCAB device 10)
As shown in FIG. 1, the FCAB device 10 is a device mainly for protecting an occupant on the side opposite to the collision side in the event of a side collision of a vehicle, and includes an airbag 24 and an inflator 26. There is. The airbag 24 and the inflator 26 are normally modularized and housed in the side portion 20A.

As shown in FIGS. 1 and 2, the airbag 24 includes a main chamber 28 and a sub-chamber 30 that expand and expand under the pressure of the gas generated from the inflator 26. The main chamber 28 expands and expands from the side portion 20A of the vehicle seat 16A to the front side of the vehicle. At the time of this expansion and deployment, the pad material and the seat skin (not shown) arranged on the side portion 20A are configured to be broken by receiving the expansion pressure of the airbag 24. Further, the sub-chamber 30 is connected to the base cloth on the side surface of the main chamber 28 facing the vehicle seat 16B side. The sub-chamber 30 is configured to expand and expand from the upper side surface of the main chamber 28 to the vehicle seat 16B side, and to be arranged between the main chamber 28 and the side portion 20A of the vehicle seat 16B. Unless otherwise specified, the front-back, left-right, up-down directions of the airbag 24 described in the following description indicate the directions in which the airbag 24 is expanded and expanded, and the front-back, left-right, up-down directions of the seat back 20 are shown. It is almost the same as the direction.

The main chamber 28 as the first bag is formed into a bag shape by folding a single base cloth formed by cutting out, for example, a nylon-based or polyester-based cloth material in half and sewing the outer peripheral edge portion. ing. The manufacturing method of the main chamber 28 is not limited to the above, and can be appropriately changed. For example, the main chamber 28 may be formed by overlapping two base fabrics and sewing the outer peripheral edge portion.

The main chamber 28 is formed so as to form an elongated substantially oval shape along the vertical direction of the seat back 20 when the expanded and deployed state is viewed from the side. The size of the main chamber 28 is set to a size capable of restraining (protecting) the occupant P seated on the vehicle seat 16A from the head H to the abdomen B. Further, a communication hole 32 is formed in the upper part of the side surface 28A on the central side (vehicle seat 16B side) in the vehicle width direction of the main chamber 28 in the upper part in the vertical direction. The communication hole 32 communicates the inside of the main chamber 28 with the inside of the sub-chamber 30.

Further, the size of the communication hole 32 is designed so that the internal pressure of the main chamber 28 can be maintained at a predetermined value or more at the initial stage of deployment of the airbag 24. That is, when the communication hole 32 is excessively large, the amount of gas supplied from the communication hole 32 to the inside of the sub-chamber 30 becomes excessive at the initial stage of deployment, and the internal pressure of the main chamber 28 decreases. Therefore, the pressing force applied to the pad material and the seat skin from the main chamber 28 to the front side of the vehicle is reduced. As a result, if the breakage of the seat skin is delayed, the completion of expansion of the main chamber 28 is delayed. Therefore, the size of the communication hole 32 is designed so that the internal pressure of the main chamber 28 is maintained at a predetermined value at the initial stage of deployment and the pad material and the seat skin can be broken.

Further, although not shown, the main chamber 28 is formed with a vent hole for communicating the inside and the outside of the main chamber 28. This vent hole is configured to discharge a part of the gas supplied from the inflator 26 into the main chamber 28 to the outside of the main chamber 28.

The sub-chamber 30 as the second bag is formed in a box shape open to one side by sewing the outer peripheral edge portion of a single base cloth formed by cutting out, for example, a nylon-based or polyester-based cloth material. There is. The sub-chamber 30 is formed so as to have a smaller capacity than the internal capacity of the main chamber 28.

FIG. 3A is a developed view of the subchamber 30. As shown in this figure, the subchamber 30 includes a bottom surface portion 34 that constitutes the bottom portion of the box in a sewn state, and a side surface portion 36 that constitutes the side surface portion of the box. The bottom surface portion 34 is formed in a rectangular shape, and side surface portions 36 extend from each of the four sides constituting the outer peripheral portion. Each side surface portion 36 is formed in a rectangular shape. The side surface portion 36 has a first seam allowance 36A provided on one side corresponding to an end portion on the outer side in the surface direction and a second seam allowance 36A provided on one side adjacent to the other side surface portion 36 in the deployed state of the subchamber 30. It has a seam allowance of 36B.

The subchamber 30 is folded so that each side surface portion 36 is perpendicular to the bottom surface portion 34. In this state, each second seam allowance 36B is overlapped and sewn on one side of another adjacent side surface portion 36. As a result, the shape of the subchamber 30 becomes a box shape open to one side (see FIG. 3B).

Further, as shown in FIG. 3B, the first seam allowance 36A of the sub-chamber 30 is overlapped and sewn on the side surface 28A of the main chamber 28. As a result, the sub-chamber 30 is coupled to the main chamber 28.

As shown in FIGS. 2 and 4, a resin coating material 38 is applied to the outer surface of the base cloth of the subchamber 30. As a result, the air permeability of the sub-chamber 30 is set lower than that of the main chamber 28 made of the non-coated cloth. Further, the friction coefficient of the outer surface of the sub-chamber 30 is set to be higher than the friction coefficient of the outer surface of the main chamber 28.

The main chamber 28 may be made of a coated cloth. In this case, the air permeability of the sub-chamber 30 is made lower than the air permeability of the main chamber 28 by making the amount of the coating material 38 applied to the sub-chamber 30 larger than the amount of the coating material applied to the main chamber 28. Can be set. Further, the friction coefficient of the outer surface of the sub-chamber 30 can be set to be higher than the friction coefficient of the outer surface of the main chamber 28.

On the other hand, as shown in FIGS. 1 and 4, the inflator 26 is a so-called cylinder type inflator, and is formed in a cylindrical shape. The inflator 26 is housed in the rear end portion in the front-rear direction in the main chamber 28 together with a rectifying cloth (not shown). As an example, this rectifying cloth is made by sewing a cloth material similar to the base cloth of the main chamber 28 into a tubular shape, and houses the inflator 26 inside. The inflator 26 and the rectifying cloth are arranged in the main chamber 28 in a posture in which the axial direction thereof is along the height direction of the seat back 20.

A pair of upper and lower stud bolts 42 (see FIG. 4) project outward from the outer peripheral portion of the inflator 26 in the vehicle width direction. These stud bolts 42 penetrate the base cloth of the main chamber 28, the base cloth of the rectifying cloth, and the side frame 21A of the seat back frame 21 which is the skeleton of the seat back 20, and the nut 44 is screwed to the tip side. doing. As a result, the main chamber 28 of the airbag 24 and the rectifying cloth are fastened and fixed to the side frame 21A of the seat back frame 21 via the inflator 26.

An ECU (Electrical Control Unit) 46 mounted on a vehicle is electrically connected to the inflator 26. A side collision sensor (not shown) for detecting a side collision of the vehicle is electrically connected to the ECU 46. The ECU 46 is configured to activate the inflator 26 when a side collision is detected based on a signal from the side collision sensor. When a pre-crash sensor that predicts (predicts) a side collision is electrically connected to the ECU 46, the inflator 26 is activated when the ECU 46 predicts a side collision based on a signal from the pre-crash sensor. May be configured.

As shown in FIG. 2, the inflator 26 is activated when a side collision on the left side surface of the vehicle is detected. When the inflator 26 is activated, gas is ejected from a gas generating portion (not shown) and supplied to the inside of the main chamber 28 through an opening formed in the rectifying cloth. Further, the gas supplied to the main chamber 28 is supplied to the inside of the sub-chamber 30 through the communication hole 32.

At the time of this expansion and deployment, first, the main chamber 28 expands and expands to the front side of the vehicle and the upper side of the vehicle while breaking the pad material and the seat skin. Next, the expansion and deployment of the sub-chamber 30 is completed, and the expansion and deployment of the airbag 24 is completed by arranging the sub-chamber 30 between the main chamber 28 and the seat back 20 of the vehicle seat 16B. In this state, the subchamber 30 is arranged at a position where it overlaps with the head H of the occupant P in the side view.

As shown in FIG. 4, when the expansion and deployment of the airbag 24 is completed, the occupant P seated on the vehicle seat 16A tries to move to the center side in the vehicle width direction by inertial force, so that the main chamber 28 is for the vehicle. It is pressed toward the sheet 16B side. In particular, the head H of the occupant P is moved toward the center side in the vehicle width direction before the abdomen B, and presses the main chamber 28 toward the vehicle seat 16B side (see arrow F1). When the main chamber 28 is displaced toward the vehicle seat 16B due to the pressing force from the occupant P, the bottom surface 34 of the sub-chamber 30 is pressed against the seat back 20 of the vehicle seat 16B. As a result, the main chamber 28 is subjected to a reaction force (see arrow R1) in the direction opposite to the moving direction of the occupant P from the seat back 20 via the sub-chamber 30. As a result, the main chamber 28 is prevented from falling toward the vehicle seat 16B side, so that the abdomen B can be restrained from the head H of the occupant P by the main chamber 28.

Further, since the airbag 24 is provided with a vent hole (not shown) for discharging gas on the main chamber 28 side, the internal pressure of the main chamber 28 is set lower than the internal pressure of the sub chamber 30. As a result, the occupant P collides with the main chamber 28 (inertial movement), so that the collision energy is absorbed.

Further, the air permeability of the base cloth of the sub-chamber 30 is set lower than the air permeability of the base cloth of the main chamber 28 by using the coating material 38. Therefore, the decrease in the internal pressure of the sub-chamber 30 is suppressed, and the reaction force applied from the seat back 20 to the main chamber 28 via the sub-chamber 30 is increased.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

In the present embodiment, when a side collision on the left side of the vehicle is detected, the inflator 26 is activated, and the gas generated from the inflator 26 is supplied to the airbag 24 housed in the vehicle seat 16A. Specifically, gas is supplied to the inside of the main chamber 28 and the sub-chamber 30 constituting the airbag 24. The main chamber 28 expands and expands from the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16A to the front side of the vehicle. On the other hand, the sub-chamber 30 expands and expands between the main chamber 28 and the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16B. As a result, when a load is input to the main chamber 28 from the occupant P who intends to move to the center side (side collision side) in the vehicle width direction by inertial force, the seat back 20 of the vehicle seat 16B passes through the sub-chamber 30. A reaction force is applied to the main chamber 28. As a result, the main chamber 28 is suppressed from falling toward the vehicle seat 16B side, and the occupant P who is about to inertially move toward the center side in the vehicle width direction is restrained by the main chamber 28.

Further, in the present embodiment, the subchamber 30 is arranged at a position where it overlaps with the head H of the occupant P when the expanded and deployed state of the airbag 24 is viewed from the side surface. As a result, the head H, which is inertially moved toward the center side in the vehicle width direction before the abdomen B, can be quickly restrained.

Further, in the present embodiment, the internal pressure of the main chamber 28 is set to be lower than the internal pressure of the sub-chamber 30. Therefore, the collision energy of the occupant P inertially moving toward the center in the vehicle width direction is effectively absorbed by the main chamber 28 having a low internal pressure, and effectively from the seat back 20 by using the sub-chamber 30 having an increased internal pressure. You can get a reaction force. As a result, the occupant protection performance and the occupant restraint performance of the airbag 24 can be effectively enhanced.

Further, in the present embodiment, the sub-chamber 30 is formed in a box shape, and the bottom surface portion 34 constituting the bottom portion of the box is configured to come into contact with the seat back 20 of the vehicle seat 16B in a state of being expanded and expanded. .. In this way, since the sub-chamber 30 comes into contact with the side portion 20A on the center side of the seat back 20 in the vehicle width direction in a plane, the reaction force applied from the seat back 20 can be stabilized.

Further, in the present embodiment, the coating material 38 is applied to the surface of the base cloth of the subchamber 30, and the friction coefficient of the contact surface (bottom surface portion 34) with the seat back 20 in the vehicle seat 16B on the passenger seat side is increased. It has been raised. As a result, the bottom surface portion 34 and the skin of the seat back 20 are frictionally engaged with each other, and the displacement of the subchamber 30 due to the impact when the occupant P collides with the airbag 24 can be suppressed. As a result, the reaction force applied from the seat back 20 via the sub-chamber 30 can be further stabilized.

Further, in the present embodiment, the coating material 38 is applied to the surface of the base cloth of the sub-chamber 30, and the air permeability of the sub-chamber 30 is set lower than the air permeability of the main chamber 28. As a result, the decrease in the internal pressure of the sub-chamber 30 is suppressed as compared with the main chamber 28, so that the occupant restraint performance by the airbag 24 can be improved.

[Second Embodiment]
Hereinafter, the vehicle front center airbag device 50 according to the second embodiment will be described with reference to FIG. The same components as those of the above-described first embodiment are designated by the same numbers, and the description thereof will be omitted.

As shown in FIG. 5, in this second embodiment, the members corresponding to the main chamber 28 and the sub-chamber 30 in the first embodiment are separately modularized and mounted on the vehicle seats 16A and 16B, respectively. It is characterized by the fact that it is. Specifically, the vehicle seat 16A accommodates the first bag 52 corresponding to the main chamber 28, and the vehicle seat 16B accommodates the second bag 54 corresponding to the sub-chamber 30.

The first bag 52 is housed in the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16A. Similar to the main chamber 28 of the first embodiment, the first bag 52 is formed in a bag shape having an elongated substantially oval shape along the vertical direction of the seat back 20 when the expanded and deployed state is viewed from the side. Has been done. Inside the first bag 52, an inflator 26 fixed to a side frame 21A of the vehicle seat 16A is housed.

The second bag 54 is housed in the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16B. The second bag 54 is formed in a bag shape having a smaller capacity than that of the first bag 52, and expands and expands by receiving gas supply from an inflator 26 fixed to a side frame 21A of the vehicle seat 16.

In the present embodiment, when a side collision on the right side of the vehicle is detected, the inflator 26 housed in the vehicle seats 16A and 16B is activated, and gas is supplied to the inside of the first bag 52 and the second bag 54, respectively. Will be done. The first bag 52 expands and expands from the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16A to the front side of the vehicle and the upper side of the vehicle. On the other hand, the second bag 54 expands and expands from the side portion 20A of the vehicle seat 16B toward the front side of the vehicle and slightly toward the center side in the vehicle width direction. The second bag 54 is arranged between the first bag 52 and the side portion 20A of the vehicle seat 16B on the rear side of the vehicle with respect to the first bag 52 in the expanded and deployed state. Further, the second bag 54 is arranged at a position overlapping with the head H of the occupant P seated on the vehicle seat 16A when viewed from the side.

When the occupant P tries to move to the center side in the vehicle width direction due to the inertial force at the time of a side collision, a load in the vehicle width direction outside (vehicle seat 16B side) direction is input from the occupant P to the first bag 52 (FIG. 5). See arrow F1). When the first bag 52 is displaced accordingly, a reaction force is applied from the seat back 20 via the second bag 54 (see arrow R2 in FIG. 5). As a result, the first bag 52 is prevented from falling toward the vehicle seat 16B side, so that the abdomen B can be restrained from the head H of the occupant P by the first bag 52.

(Action / effect)

According to the above configuration, a load is input to the first bag 52 from the occupant P who moves to the center side in the vehicle width direction by inertial force at the time of a side collision of the right side portion of the vehicle. At this time, the first bag 52 is subjected to a reaction force from the seat back 20 of the vehicle seat 16B via the second bag 54. As a result, the first bag 52 is prevented from falling toward the vehicle seat 16B side, and the occupant P who is about to inertially move toward the center side in the vehicle width direction can be restrained by the first bag 52.

[Third Embodiment]
Hereinafter, the vehicle front center airbag device 60 according to the third embodiment will be described with reference to FIGS. 6 and 7. The same components as those of the above-described first embodiment are designated by the same numbers, and the description thereof will be omitted.

As shown in these figures, the third embodiment is characterized in that the check valve 62 is provided in the communication hole 32 that communicates the inside of the main chamber 28 and the sub-chamber 30.

The check valve 62 suppresses the gas supplied from the main chamber 28 into the sub-chamber 30 through the communication hole 32 to flow back into the main chamber 28 when the airbag 24 expands and expands. Has a function to do. The check valve 62 is made of, for example, a nylon-based or polyester-based cloth material, and includes a lid portion 64 and a fixing portion 66.

The lid portion 64 is formed in a substantially circular shape that is one size larger than the communication hole 32, and is arranged so as to cover the communication hole 32 from the inside of the main chamber 28. On the other hand, the fixing portion 66 is provided on the peripheral edge portion of the lid portion 64 and is used as a seam allowance for suturing. The fixing portion 66 is sewn from the inside of the main chamber 28 to the side surface 28A on the center side in the vehicle width direction of the main chamber 28. As a result, the check valve 62 is attached to the main chamber 28. Further, when the check valve 62 is attached to the main chamber 28, the coating material 38 is applied to the inner side surface 62A facing the inside of the main chamber 28. On the other hand, the outer surface 62B of the check valve 62 facing the communication hole 32 side is in a non-coated state in which the coating material 38 is not applied (see FIG. 7B). As a result, the friction coefficient of the inner surface 62A of the check valve 62 is set higher than the friction coefficient of the outer surface 62B.

(Action and effect)
Next, the behavior of the check valve 62 at the time of starting the inflator 26 will be described with reference to FIG. 7, and the operation and effect of the present embodiment will be described.

As shown in FIG. 7A, the check valve 62 having the above configuration is normally arranged so as to cover the communication hole 32 from the inside of the main chamber 28. Then, it is folded together with the main chamber 28 and housed in the side portion 20A of the vehicle seat 16A.

As shown in FIG. 7B, when the inflator 26 is activated and gas is supplied to the inside of the main chamber 28, it is reversed by the pressure of the gas supplied to the inside of the subchamber 30 through the communication hole 32. The lid 64 of the check valve 62 is sucked into the subchamber 30 from the communication hole 32. In this state, the check valve 62 is separated from the side surface 28A by the pressure of the gas, and the communication hole 32 is opened. As a result, gas is supplied to the inside of the subchamber 30.

After that, as shown in FIG. 7C, when the expansion and deployment of the subchamber 30 is completed, the pressure of the gas input to the check valve 62 is lost, and the inner side surface 62A becomes the side surface from the outside of the main chamber 28. Adheres to 28A. As a result, the communication hole 32 is closed again by the check valve 62, and the gas supplied to the sub-chamber 30 is suppressed from flowing back into the main chamber 28.

With the above configuration, it is possible to effectively suppress a decrease in the internal pressure of the subchamber 30 after the expansion and deployment of the airbag 24 is completed. As a result, the reaction force applied from the side portion 20A of the seat back 20 can be effectively increased, and the occupant restraint performance by the airbag 24 is improved.

Further, in the present embodiment, since the coating material 38 is applied only to the inner side surface 62A of the check valve 62, the outer surface 62B having a low friction coefficient comes into contact with the side surface 28A of the main chamber 28 before the inflator is operated. ing. Therefore, the friction between the check valve 62 and the main chamber 28 at the initial stage of deployment of the airbag 24 can be reduced, and the check valve 62 can be smoothly sucked into the communication hole 32. On the other hand, after the expansion and deployment of the sub-chamber 30 is completed, the inner side surface 62A having a high friction coefficient is in contact with the side surface 28A of the main chamber 28. As a result, the check valve 62 and the side surface 28A can be frictionally engaged with each other to close the communication hole 32. As a result, the backflow of gas can be further suppressed.
[Supplemental Information]

In the first embodiment, the FCAB device 10 is mounted on the vehicle seat 16A on the driver's side, but the present invention is not limited to this. The FCAB device may be mounted on the vehicle seat 16B on the passenger seat side. That is, the airbag and the inflator may be accommodated in the side portion 20A on the center side in the vehicle width direction of the seat back 20 of the vehicle seat 16B. In this case, when a side collision occurs on the right side of the vehicle, the occupant seated on the vehicle seat 16B can be restrained.

In the second embodiment, the first bag 52 is mounted on the vehicle seat 16A on the driver's side, but the present invention is not limited to this. The first bag may be mounted on the vehicle seat 16B on the passenger seat side, and the second bag 54 may be mounted on the vehicle seat 16A on the driver's seat side.

Further, in the second embodiment, the base cloth of the second bag 54 may be made of a coated cloth, and the air permeability of the second bag 54 may be lowered as in the subchamber 30 of the first embodiment. Alternatively, the coefficient of friction on the surface of the second bag 54 may be increased. Further, the check valve 62 of the third embodiment may be composed of a reed valve that covers the communication hole 32 from the outside of the main chamber 28.

10 Vehicle front center airbag device (FCAB device)
16A Vehicle seat (driver's seat)
16B vehicle seat (passenger seat)
20 Seat back 20A Side part (side part)
26 Inflator 28 Main chamber (1st bag)
30 subchamber (second bag)
50 Vehicle front center airbag device 52 1st bag 54 2nd bag 60 Vehicle front center airbag device

Claims (1)

An inflator that is installed in the center side of the driver's seat and at least one of the passenger seats in the vehicle width direction and generates gas when activated.
A first bag that is housed in the side portion of the driver's seat or the passenger seat and is expanded and deployed toward the front side of the vehicle by supplying the gas to the inside.
It is housed in the side part of the driver's seat or the passenger seat, and the gas is supplied to the inside to expand and expand between the first bag and the side part on the side where the first bag is not housed. The second bag to do
Front center airbag device for vehicles equipped with.

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