JP2022143572A - Airbag device for front passenger seat - Google Patents

Abstract

To provide an airbag device for a front passenger seat that can disperse a load acting on a rib at the time of a vehicle collision.SOLUTION: An airbag device 10 for a front passenger seat includes: a main bag 22 that inflates and expands to restrain a passenger P wearing a three-point type seat belt 42 on a front passenger seat 12, at a front side of a vehicle of the passenger P, at the time of a vehicle collision or at the time of predicting a vehicle collision; and a sub bag 24 that is protruded to a rear side of the vehicle more than a rear end part of the main bag 22 when inflating and expanding, in an area corresponding to a lower part of a rib of the passenger P near buckle 44 in the three-point type seat belt 42.SELECTED DRAWING: Figure 1

Description

The present invention relates to an airbag device for a passenger seat.

Patent Literature 1 discloses a force limiter load changing system for changing the seat belt load limit, that is, the force limiter load (hereinafter also referred to as FL (Force Limiter) load). In this force limiter load changing system, for example, when the vehicle occupant is an elderly person with low bone density of the clavicle, when it is determined that the occupant's resistance value is low, an actuation signal is sent to the solenoid immediately after this determination. is output, and the FL load is changed to the low load mode. By switching the FL load of the seatbelt to the low load mode in this manner, the load on the ribs of the occupant due to the seatbelt at the time of vehicle collision can be reduced.

JP 2018-39336 A

However, the lower the FL load of the seat belt, the greater the amount of movement of the occupant to the front of the vehicle at the time of a vehicle collision, and the occupant interferes with the steering wheel and instrument panel (hereinafter simply referred to as "instrument panel"). becomes more likely. Therefore, the FL load can be reduced only within a range of values in which the passenger does not interfere with the steering wheel or the instrument panel in the event of a vehicle collision. In addition, in elderly people with low bone density of the clavicle, the load due to the surface pressure from the seat belt cannot be absorbed by the deflection of the assist cartilage alone due to the decrease in bone density. The effect is remarkable, but the lower part is less effective than the upper part.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a front passenger seat airbag device capable of dispersing the load applied to the ribs in the event of a vehicle collision.

In order to achieve the above object, the front passenger's seat airbag device according to claim 1 of the present invention provides a vehicle for an occupant wearing a three-point seat belt on the front passenger's seat at the time of a vehicle collision or when a vehicle collision is predicted. A main bag that is inflated and deployed on the front side to restrain the occupant, and a region of the three-point seat belt that corresponds to the lower ribs of the occupant on the buckle side, and is positioned higher than the rear end of the main bag when inflated and deployed. and a sub-bag projecting toward the rear side of the vehicle.

According to the first aspect of the present invention, in the region corresponding to the lower part of the ribs of the occupant on the buckle side of the three-point seat belt, the sub-bag protrudes rearward of the vehicle from the rear end portion of the main bag when inflated and deployed. Equipped with a bag. As a result, at the time of a vehicle collision or when a vehicle collision is predicted, the sub-bag is inflated and deployed against the lower ribs, where bone fractures are more likely to occur in elderly people with lower bone density than in young people. The lower part of the ribs is pressed by the bag, and the load due to the surface pressure from the seat belt on the lower part of the ribs can be dispersed. That is, the load applied to the ribs can be distributed.

Further, in the passenger seat airbag device according to the present invention, the subbag is integrally formed with the main bag.

According to the second aspect of the present invention, since the sub-bag is formed integrally with the main bag, it is possible to easily form an airbag corresponding to the lower ribs on the buckle side.

Further, according to a third aspect of the present invention, there is provided a front passenger's seat airbag device, which is integrally formed inside the main bag in the vehicle width direction, and which is located behind the rear end portion of the main bag when the main bag is inflated and deployed. A center bag protruding to the side is further included, and the sub-bag is integrally formed with the center bag.

According to the third aspect of the present invention, the center bag abuts the restraint surface (rear surface) of the main bag and the side surface of the center bag so that the occupant's head, which moves obliquely forward due to inertial force in the event of an oblique collision of the vehicle, hits. The contact suppresses head rotation around the Z-axis. Also, the center bag and the sub bag are integrally formed. Therefore, even if the occupant's body rotates around the seatbelt (belt path) in an oblique vehicle collision, and the amount of movement of the part above the seatbelt to the front of the vehicle increases, the center bag remains integrated with the center bag. Since the sub-bag that is formed and inflated and deployed presses the lower ribs, it is possible to suppress an increase in the load due to the surface pressure of the seat belt on the lower ribs.

According to a fourth aspect of the present invention, there is provided an airbag device for a passenger's seat, which further includes a partition that partitions the main bag and the sub-bag and holds the internal pressure of the sub-bag.

According to the fourth aspect of the present invention, the main bag and the sub-bag are separated from each other, and the partition further includes a partition that retains the internal pressure of the sub-bag. The internal pressure of the bag can be retained. As a result, the load distribution time can be lengthened.

According to a fifth aspect of the present invention, there is provided a front passenger seat airbag device, which is provided in a seat on which the passenger sits, and inflates on the side of the passenger on the buckle side at the time of the vehicle collision or when the vehicle collision is predicted. A side bag that deploys is further included, and the sub bag is formed integrally with the side bag and is interposed between the occupant and the main bag when inflated and deployed.

Side bags generally have a smaller capacity than the main bag. Therefore, according to the fifth aspect of the present invention, the sub-bag is integrally formed with the side bag. A check valve or the like can be made unnecessary.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to obtain an airbag device for a front passenger's seat that can disperse the load applied to the ribs in the event of a vehicle collision.

FIG. 2 is a front view showing a state of the airbag for a front passenger's seat according to the first embodiment when it is inflated and deployed in relation to an occupant. FIG. 2 is a plan view showing a state of the airbag for a front passenger seat according to the first embodiment when it is inflated and deployed in relation to an occupant. FIG. 2 is a side view showing a state of the airbag for a front passenger's seat according to the first embodiment when it is inflated and deployed in relation to an occupant. FIG. 11 is a plan cross-sectional view showing a passenger-side airbag according to a second embodiment, horizontally cut at the position of a subbag. It is an A arrow enlarged view of the partition part 26 seen from the arrow A view of FIG. FIG. 11 is a front view showing a state of the airbag for the front passenger's seat according to the third embodiment when it is inflated and deployed in relation to the occupant. FIG. 11 is a plan view showing a state of the airbag for the front passenger seat according to the third embodiment when it is inflated and deployed in relation to the occupant. FIG. 11 is a side view showing a state of the airbag for the front passenger seat according to the third embodiment when it is inflated and deployed, in relation to the occupant. FIG. 11 is a plan view showing a state of an airbag for a front passenger's seat according to a fourth embodiment when it is inflated and deployed in relation to an occupant. FIG. 11 is a side view showing a state of the airbag for the front passenger seat according to the fourth embodiment when it is inflated and deployed, in relation to the occupant.

(First embodiment)
A passenger airbag device 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. The passenger airbag 20 (hereinafter simply referred to as "airbag 20") of the passenger airbag device 10 shown in each drawing is shown inflated and deployed in a state in which the occupant P is not restrained. ing. Arrow FR shown in each figure indicates the front side in the vehicle longitudinal direction, arrow UP indicates the upper side in the vertical direction of the vehicle, and arrow IN indicates the inner side (RH) in the vehicle width direction. An arrow FR, an arrow UP, and an arrow IN indicate the inside of the vehicle in the forward direction, the upward direction, and the vehicle width direction, respectively, to which the passenger airbag device 10 is applied. In the following description, when simply using the front-rear, up-down, and vehicle inner-outer directions, the front-rear direction in the vehicle front-rear direction, the vehicle up-down direction, and the vehicle inner-outer direction in the vehicle width direction are indicated unless otherwise specified. and

A driver's seat (not shown) and a front passenger's seat 12 are arranged side by side in the vehicle width direction in the front part of the compartment of the vehicle. In this embodiment, a right-hand drive vehicle in which a driver's seat is arranged on the right side in the vehicle width direction and a passenger's seat 12 is arranged on the left side will be described as an example. As shown in FIG. 1, the front passenger seat 12 includes a seat cushion (not shown) on which the passenger P sits, a seat back 14 that serves as a backrest for the passenger P, and a headrest 16 that supports the head H of the passenger P. is configured with The driver's seat and the front passenger's seat 12 are respectively equipped with a three-point seat belt device 40 as an occupant restraint device and an airbag device as an occupant restraint auxiliary device. In front of the front passenger seat 12, as shown in FIG. 1, a front passenger seat airbag device 10 is mounted.

As shown in FIG. 1, the three-point seat belt device 40 includes a seat belt (webbing) 42, an anchor plate (not shown) to which one end of the seat belt 42 is anchored, and the other end of the seat belt 42. A retractor (not shown) with a pretensioner that is engaged and applies a predetermined tension to the seat belt 42, and a buckle 44 that is fixed by fitting a tongue (not shown) inserted through the seat belt 42. and

As shown in FIGS. 1 and 2, the passenger's seat airbag device 10 is provided inside an instrument panel (hereinafter referred to as an instrument panel) 18 at a position facing the passenger's seat 12 . The passenger-side airbag device 10 has a case (not shown), an inflator 21, and an airbag 20. During normal non-operation, the airbag device 10 is attached to an instrument panel reinforcement (not shown). The inflator 21 and the airbag 20 in a folded state are accommodated. The inflator 21 operates to supply gas to the airbag 20 when a vehicle collision is detected by a sensor and control device (not shown). Note that the detection of a vehicle collision also includes prediction of a vehicle collision.

An airbag door (not shown) is formed at a portion of the instrument panel 18 corresponding to the airbag device 10 for the front passenger seat. It is opened by a tear portion (not shown) that That is, when a vehicle collision is detected by a sensor and control device (not shown), the inflator 21 operates to supply gas to the airbag 20 and inflate and deploy the folded airbag 20 toward the airbag door. The airbag 20 is inflated and deployed toward the rear side of the vehicle, that is, toward the passenger's seat 12 by pressing the airbag door to open it.

Next, the inflated and deployed shape (form) of the airbag 20 will be described. The inflated and deployed shape shown below is the inflated and deployed state in which the occupant P seated on the front passenger seat is not restrained. Actually, the airbag 20 restrains the occupant P when inflated and deployed. The airbag 20 has a main bag 22 and a subbag 24, as shown in FIGS. The main bag 22 is substantially bilaterally symmetrical in a plan view, and is inflated and deployed in a bag-like shape with a larger width in the vehicle width direction and the vehicle vertical direction toward the rear side of the vehicle (passenger side). there is A vent hole (not shown) for adjusting the internal pressure is formed in the main bag 22 .

As shown by hatching in FIG. 1, the sub-bag 24 is located closer to the vehicle than the rear end of the main bag 22, as shown by hatching in FIG. It is configured to be inflated and deployed in the shape of a bag protruding rearward. The main bag 22 and the sub-bag 24 are integrally formed and communicate with each other at the rear end of the main bag 22, that is, at the boundary between the main bag 22 and the sub-bag 24. As shown in FIG. As a result, the main bag 22 and the sub-bag 24 receive gas supplied from the common inflator 21 and are inflated and deployed as a single airbag 20 .

Next, the arrangement position of the airbag 20 when inflated and deployed will be described. As shown in FIG. 2, the airbag 20 is arranged so that when the center line in the vehicle width direction is extended, it substantially coincides with the seat width (vehicle width) direction center line (not shown) of the front passenger seat 12 . there is When the airbag 20 is inflated and deployed, the rear end of the main bag 22 on the vehicle width direction inner side (right side) is positioned in front of the right shoulder of the occupant P, and the vehicle width direction outer side (left side) of the main bag 22 is positioned in front of the occupant P's right shoulder. ) is located in front of the passenger P's left shoulder. The central portion of the rear end of the main bag 22 in the vehicle width direction is positioned in front of the head H of the occupant P. As shown in FIG. restrains the occupant P when moving to the front side of the vehicle by

1 and 2, the sub-bag 24 is disposed in a region corresponding to the lower ribs of the occupant P on the buckle 44 side. As shown in FIG. 5, the sub-bag 24 restrains the lower part of the ribs of the occupant P on the side of the buckle 44, i.e., on the right side in the vehicle width direction, when the occupant P moves forward due to inertial force during a vehicle collision. do. When restrained by the sub-bag 24, the sub-bag 24 is pushed toward the front of the vehicle by the lower ribs of the occupant P and deployed in the vehicle vertical direction and vehicle width direction, as indicated by the two-dot chain line in FIG. be. In this embodiment, as an example, the inflator 21 is arranged so that its center line in the vehicle width direction substantially coincides with the center line in the vehicle width direction of the airbag 20 in the completed inflation and deployment state.

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

In the passenger seat airbag device 10 of the first embodiment, when a vehicle collision is detected by a sensor and a control device (not shown), the inflator 21 is activated and gas is supplied to the airbag 20 . The airbag 20 supplied with gas from the inflator 21 is inflated and deployed from inside the instrument panel 18 toward the vehicle compartment while opening an airbag door (not shown) set in the instrument panel 18 .

In the passenger seat airbag device 10 of the first embodiment, the region corresponding to the lower ribs of the occupant P on the buckle 44 side of the three-point seat belt 42 is positioned further rearward of the vehicle than the rear end portion of the main bag 22 when inflated and deployed. A sub-bag 24 protruding to the side is provided.

As a result, at the time of a vehicle collision, the sub-bag 24 is inflated and deployed against the lower part of the ribs, which are more likely to be fractured in the elderly or the like who have a lower bone density than in the young. By pressing the lower part, the load due to the surface pressure from the seat belt 42 on the lower part of the ribs can be dispersed. That is, the load applied to the ribs of the occupant P can be dispersed.

In addition, in the first embodiment, the sub-bag 24 is provided only on the buckle 44 side, so the entire lower part of the ribs, that is, the buckle 44 side (vehicle width direction inner side) and the buckle 44 side opposite side (vehicle width direction) As compared with the case where the sub-bag 24 is provided in the region including the direction outside), the increase in the capacity of the airbag 20 can be suppressed and the output of the inflator 21 for supplying gas to the airbag can be reduced. . Therefore, the size of the inflator 21 can be reduced, so that the passenger airbag device 10 can be mounted on a vehicle more easily.

Further, according to the first embodiment, the sub-bag 24 is integrally formed with the main bag 22, so that an airbag corresponding to the lower ribs on the buckle 44 side can be easily formed.

Further, in the event of a vehicle collision, the inflated and deployed sub-bag 24 can increase the restraint force on the torso, which is the center of gravity of the body of the occupant P, so that the amount of movement of the occupant P toward the front of the vehicle can be suppressed. . This makes it possible to further reduce the load of the seat belt 42 .

(Second embodiment)
Next, a passenger airbag device 10A of a second embodiment according to the present invention will be described with reference to FIGS. 4 and 5. FIG. In addition, in the second embodiment, only the points different from the above-described first embodiment will be described in detail, and the description of the same points will be omitted as appropriate.

A passenger-seat airbag 20A (hereinafter simply referred to as "airbag 20A") of the passenger-seat airbag device 10A of the second embodiment is the airbag 20 of the above-described first embodiment further shown in FIG. The main bag 22 and the sub-bag 24 are separated from each other so that the main bag 22 and the sub-bag 24 are separated from each other so that the main bag 22 and the sub-bag 24 are separated from each other. That is, the sub-bag 24 is a separate chamber from the main bag 22 .

FIG. 5 is an enlarged view in the direction of arrow A in FIG. 4 . As shown in FIGS. 4 and 5, the partition 26 includes a first base fabric 26A and a second base fabric 26B. The first base fabric 26A has an area larger than the area of the boundary between the main bag 22 and the sub-bag 24 and is formed in a substantially square shape. In addition, the first base fabric 26A is sewn (sewing S1) to the main bag 22 or the sub bag 24 at the edges of both ends in the vehicle width direction at the boundary between the main bag 22 and the sub bag 24. are sewn loosely. A valve hole 26H is formed in the first base fabric 26A substantially at the center in the vehicle vertical direction and vehicle width direction.

The second base cloth 26B is made of the same cloth material as the first base cloth 26A and is formed in a long belt shape larger than the valve hole 26H, and is smaller than the first base cloth 26A in the vehicle width direction (short side). , the vehicle vertical direction (long side) is formed larger than the first base cloth 26A. As shown in FIG. 4, the second base fabric 26B is arranged closer to the main bag 22 than the valve hole 26H. It is sewn (sewing S2) to the main bag 22 or the sub-bag 24, and is sewn in a state of being stretched in the vertical direction of the vehicle.

The partition 26 allows gas to flow from the main bag 22 to the sub-bag 24 by opening the valve hole 26H, while blocking the gas from the sub-bag 24 to the main bag 22 by closing the valve hole 26H. restricted by That is, when the internal pressure in the sub-bag 24 rises to a predetermined value or more due to the inflow of gas into the sub-bag 24 (see the arrow in FIG. 4), the partition 26 separates the first base fabric 26A from the second base fabric 26B. , and the valve hole 26H is closed. As a result, the flow of gas from inside the sub-bag 24 to inside the main bag 22 is restricted, and a decrease in the internal pressure of the sub-bag 24 is prevented or suppressed.

(Action and effect of the second embodiment)
Next, the action and effects of the second embodiment will be described.

In general, the load (tension) applied by the seat belt 42 gradually increases from the beginning of the vehicle collision. Therefore, it is preferable that the sub-bag 24 distributes the load on the ribs of the occupant P at least until the load due to the seat belt 42 reaches its maximum, and the longer the distribution time, the better. Therefore, the airbag 20A of the airbag device 10A for passenger's seat according to the second embodiment includes a partition portion 26 that partitions the main bag 22 and the sub-bag 24 and holds the internal pressure of the sub-bag 24. ing.

In the second embodiment, when the internal pressure of the sub-bag 24 is lower than a predetermined value, the partition portion 26 is in a state in which the first base cloth 26A and the second base cloth 26B are separated from each other, and the sub-bag is opened from the valve hole 26H. Gas flows into bag 24 . On the other hand, when the internal pressure in the sub-bag 24 rises above a predetermined value due to the inflow of gas into the sub-bag 24, the first base cloth 26A comes into close contact with the second base cloth 26B, closing the valve hole 26H. As a result, the flow of gas from inside the sub-bag 24 to inside the main bag 22 is restricted, and a decrease in the internal pressure of the sub-bag 24 is prevented or suppressed.

As described above, the airbag 20A of the second embodiment is provided with the partition portion 26 capable of holding the internal pressure of the subbag 24, so that the subbag 24 is maintained until the latter stage of the vehicle collision when the load due to the seat belt 42 becomes maximum. internal pressure can be maintained, the load distribution time can be lengthened.

Even if the gas continues to flow into the sub-bag 24, the main bag 22 has a vent hole (not shown) for adjusting the internal pressure, so the gas will be discharged from this vent hole. As a result, it is possible to prevent the main bag 22 and the sub-bag 24 from continuing to pressurize the occupant P during a vehicle collision.

Next, a passenger airbag device 10B of a third embodiment according to the present invention will be described with reference to FIGS. 6 to 8. FIG. In addition, in the third embodiment, only points different from the above-described first embodiment will be described in detail, and descriptions of the same points will be omitted as appropriate.

The passenger-side airbag 20B (hereinafter simply referred to as "airbag 20B") of the passenger-side airbag device 10B of the third embodiment responds to oblique collisions, as shown in FIGS. The center bag 25 is formed integrally with the main bag 22 on the inner side of the main bag 22 in the vehicle width direction. Further, the sub-bag 24B of the third embodiment is formed integrally with the center bag 25 in the region corresponding to the lower ribs of the occupant P on the buckle 44 side.

When the passenger-seat airbag device 10B is not in operation, the airbag 20B, that is, the main bag 22 and the center bag 25 (including the sub-bag 24B) are folded and attached to the instrument panel reinforcement (not shown). It is housed together with the inflator 21 in the attached case. When a vehicle collision is detected by a sensor and control device (not shown), the inflator 21 operates to supply gas to the airbag 20B and inflate and deploy the folded airbag 20B toward the airbag door. The airbag 20</b>B pushes the airbag door to open it, and is inflated and deployed toward the rear side of the vehicle, that is, toward the front passenger's seat 12 .

Next, the inflated and deployed shape (form) of the airbag 20B will be described. The inflated and deployed shape shown below is the inflated and deployed state in which the passenger P seated on the front passenger seat is not restrained. Actually, the airbag 20B restrains the occupant P when inflated and deployed. Although the airbag 20B has a main bag 22, the main bag 22 of the third embodiment has the same shape as the main bag 22 of the first embodiment. omitted.

As shown in FIG. 7, the center bag 25 is configured to be inflated and deployed in the shape of a bag protruding toward the rear side of the vehicle from the rear end portion of the main bag 22 . The main bag 22 and the center bag 25 are integrally formed and communicate with each other at the rear end of the main bag 22, that is, at the boundary between the main bag 22 and the center bag 25. As shown in FIG. 6 and 8, the center bag 25 corresponds to the lower ribs of the occupant P on the side of the buckle 44 of the main bag 22, that is, on the inner side (right side) of the center of the main bag 22 in the vehicle width direction. It is provided in the vertical direction of the vehicle including the area where the

In the second embodiment, the sub-bag 24B is a region of the center bag 25 corresponding to the lower ribs of the occupant P. As shown in FIG. In this way, since the main bag 22, the center bag 25, and the sub-bag 24B are integrally formed, the airbag 20B receives gas supplied from the common inflator 21 and inflates as a single airbag 20B. It is meant to be deployed.

In addition, the airbag 20B has a partition portion 26 as a check valve that partitions the main bag 22 and the center bag 25 (including the sub-bag 24B) and retains the internal pressure of the center bag 25 (Fig. 4 and Figure 5). That is, the center bag 25 and the main bag 22 are separate chambers. In addition, since the partition part 26 of 3rd Embodiment is substantially the same structure as the partition part 26 of 2nd Embodiment, detailed description here is abbreviate|omitted.

Next, the arrangement position of the airbag 20B when inflated and deployed will be described. As shown in FIG. 7, the airbag 20B is arranged so that when the center line in the vehicle width direction is extended, it substantially coincides with the seat width (vehicle width) direction center line (not shown) of the front passenger seat 12. there is When the airbag 20B is inflated and deployed, the rear end of the center bag 25 (including the sub-bag 24B) on the inside (right side) in the vehicle width direction is positioned in front of the occupant P's right shoulder, The rear end of the widthwise outer side (left side) is positioned in front of the occupant P's left shoulder. The central portion of the rear end of the main bag 22 in the vehicle width direction is located in front of the head H of the occupant P. As shown in FIG. The occupant P is restrained when the occupant falls sideways.

6 to 8, the center bag 25 (including the sub bag 24B) extends in the vehicle vertical direction of the main bag 22 including the area corresponding to the lower ribs of the occupant P on the buckle 44 side. It is arranged in an extended manner. The outer (left) end of the center bag 25 in the vehicle width direction is configured as shown in FIGS. As shown, it is positioned slightly to the right of the head H of the occupant P.

As shown in FIG. 7, in the event of a vehicle collision from an oblique direction indicated by an arrow D on the driver's seat side, the head H of the occupant P moving obliquely forward due to inertial force is placed on the restraining surface (rear surface) of the main bag 22. ) and the side surface of the center bag 25, the rotation of the head about the Z-axis is suppressed. In addition, the body of the occupant P rotates around the seat belt (belt path) 42, and the amount of movement of the portion above the seat belt 42 of the occupant P to the front side of the vehicle diagonally opposite to the arrow D increases. However, the sub-bag 24B included in the center bag 25 presses or restrains the lower part of the ribs of the occupant P on the side of the buckle 44, that is, on the right side in the vehicle width direction. When restrained by the sub-bag 24B, the region of the sub-bag 24B included in the center bag 25 is pressed forward of the vehicle by the lower ribs of the occupant P, as indicated by the two-dot chain lines in FIGS. , are deployed in the vehicle vertical direction and the vehicle width direction.

Here, the center bag 25 other than the area of the sub bag 24B, that is, the vehicle upper side of the center bag 25 is deformed to such an extent that the right side of the head H of the occupant P can be restrained as shown in FIG. In the present embodiment, as an example, the inflator 21 is arranged such that its center line in the vehicle width direction substantially coincides with the center line in the vehicle width direction of the airbag 20B in the fully inflated and deployed state.

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

The center bag 25 of the airbag 20B of the passenger seat airbag device 10B of the third embodiment is designed to support the head H of the occupant P, who moves obliquely forward due to the inertial force at the time of oblique collision of the vehicle, to the restraining surface of the main bag 22 ( (rear surface) and the side surface of the center bag 25, the rotation of the head around the Z-axis is suppressed. Further, in the airbag 20B of the passenger airbag device 10B of the third embodiment, the center bag 25 and the subbag 24B are integrally formed. Therefore, even if the body of the occupant P rotates around the seat belt (belt path) 42 in the oblique collision of the vehicle, and the amount of movement of the portion above the seat belt of the occupant P increases obliquely forward of the vehicle, Since the sub-bag 24B formed integrally with the center bag 25 and inflated and deployed presses the lower part of the ribs, it is possible to suppress an increase in the load due to the surface pressure of the seat belt 42 on the lower part of the ribs.

(Fourth embodiment)
Next, a passenger airbag device 10C of a fourth embodiment according to the present invention will be described with reference to FIGS. 9 and 10. FIG. In addition, in the fourth embodiment, only points different from the above-described first embodiment will be described in detail, and descriptions of the same points will be omitted as appropriate.

A passenger seat airbag 20C (hereinafter simply referred to as "airbag 20C") of the passenger seat airbag device 10C of the fourth embodiment includes, as shown in FIG. A front passenger's seat 12 is provided with a front passenger's seat 12, and includes a near side bag (not shown) and a far side bag 27 as side bags for coping with an oblique or lateral collision. The far side bag 27 is fixed in a folded state together with the inflator to a side frame (not shown) disposed inside the seat back frame in the seat back 14 of the front passenger seat 12 in the vehicle width direction. It is inflated and deployed by the gas supplied from the inflator at the time of collision from the side. A near side bag (not shown) is fixed in a folded state together with an inflator to a side frame (not shown) arranged outside in the vehicle width direction of the seat back frame arranged in the seat back 14 of the front passenger seat 12. and is inflated and deployed by gas supplied from an inflator in the event of a collision from the left side.

A split portion (not shown) is provided at a predetermined position (a portion where the front skin and the side skin are sewn) of the skin covering the inner and outer side portions 14A of the seat back 14 in the vehicle width direction. As a result, in the event of a side collision or the like, the cleft portion of the outer skin is broken, and the fur side bag 27 is moved to the side of the side portion 14A inside the seat back 14 of the passenger seat 12, that is, the side of the buckle 44 side. On the other hand, the near side bag is inflated and deployed to the front side of the vehicle and to the side of the outer side portion 14A of the seat back 14 of the passenger seat 12, respectively.

In the fourth embodiment, the sub-bag 24C is integrally formed with the far side bag 27, and the far side bag 27 and the sub-bag 24C are supplied with gas from the common inflator 21 to form a single air bag. It is designed to be inflated and deployed as a bag. The sub-bag 24C is interposed between the occupant P and the main bag 22 when inflated and deployed.

Next, the inflated and deployed shape (form) of the airbag 20C will be described. In this embodiment, a mode in which the far side bag 27 is inflated and deployed will be described. That is, the near side bag is in a state of not being inflated and deployed. The inflated and deployed shape shown below is the inflated and deployed state in which the passenger P seated on the front passenger seat is not restrained. Actually, the airbag 20C restrains the occupant P when inflated and deployed. The airbag 20</b>C has a main bag 22 . Since the main bag 22 of the fourth embodiment has the same shape as the main bag 22 of the first embodiment, detailed description thereof is omitted here.

As shown in FIG. 9, the far side bag 27 is configured to be inflated and deployed in the shape of a bag projecting forward of the vehicle on the side of the inner side portion 14A of the seat back 14 of the passenger seat 12. As shown in FIG. As shown in FIG. 10, the far side bag 27 is formed in a substantially rectangular shape when viewed from the side of the vehicle, and restrains the right side of the occupant P seated on the front passenger seat 12, such as the shoulders, chest, abdomen and waist. set as large as possible.

10, the sub-bag 24C is configured such that a region corresponding to the lower ribs of the occupant P on the buckle 44 side protrudes outward (to the left) in the vehicle width direction from the far side bag 27. , is arranged so as to be interposed between the occupant P and the main bag 22, as shown in FIG.

The far side bag 27 and the sub bag 24C are integrally formed and communicate with each other at the left side of the front end of the far side bag 27, that is, at the boundary between the far side bag 27 and the sub bag 24C.

Next, the arrangement position of the airbag 20C when inflated and deployed will be described. As shown in FIG. 9, the airbag 20C is arranged so that when the centerline of the main bag 22 in the vehicle width direction is extended, it substantially coincides with the seat width (vehicle width) centerline (not shown) of the front passenger seat 12. are arranged. In the inflated and deployed state, the rear end of the main bag 22 on the inner side (right side) in the vehicle width direction is positioned in front of the right shoulder of the occupant P, and the rear end on the outer side (left side) in the vehicle width direction is positioned in front of the occupant P's right shoulder. It is positioned in front of the left shoulder. The central portion of the rear end of the main bag 22 in the vehicle width direction is positioned in front of the head H of the occupant P. As shown in FIG. Restrain the occupant P when moving to the front side of the vehicle by

The far side bag 27 is arranged so as to be positioned on the right side of the occupant P seated on the front passenger seat 12, as shown in FIG. It is disposed at a position corresponding to the right side of the occupant P including the shoulders, chest, abdomen, waist, and the like. 9 and 10, the sub-bag 24C is interposed between the occupant P and the main bag 22 in a region corresponding to the lower ribs of the occupant P on the buckle 44 side. there is

Then, as shown in FIG. 9, when the occupant P moves to the right side opposite to the arrow E in the event of a vehicle collision from the right side indicated by the arrow E, the far side bag 27 buckles the occupant P. The sub-bag 24C restrains the 44 side, that is, the right side in the vehicle width direction, and the sub-bag 24C restrains the lower part of the ribs of the occupant P on the buckle 44 side, that is, the right side in the vehicle width direction. When restrained by the sub-bag 24C, the area of the sub-bag 24C interposed between the occupant P and the main bag 22 is pushed forward of the vehicle by the lower ribs of the occupant P, as indicated by the two-dot chain line in FIG. It is pushed and deployed in the vehicle vertical direction and vehicle width direction.

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

Side bags such as the far side bag 27 generally have a smaller capacity than the main bag 22 . Therefore, according to the fourth embodiment, since the sub-bag 24C is integrally formed with the far side bag 27, the inner pressure of the far side bag 27 is maintained between the sub-bag 24C and the far side bag 27. The partition part 26 like 2nd Embodiment can be made unnecessary.

<Supplementary explanation of the above embodiment>
(1) In the above-described embodiment, the main bag 22 is a single-chamber type airbag, but the present invention is not limited to this. Airbags may be employed.

(2) In the above-described third embodiment, the partition portion 26 is provided between the main bag 22 and the center bag 25, but the present invention is not limited to this, and the partition portion 26 is not provided. good too.

(3) In the above-described third embodiment, the main bag 22 and the center bag 25 (including the sub-bag 24B) are the single airbag 20B, but the present invention is not limited to this. For example, the shape including the center bag 25 inside (right side) from the center in the vehicle width direction of the main bag 22 is one bag shape, and the shape does not include the center bag 25 outside (left side) from the center in the vehicle width direction of the main bag 22. may be formed into a single bag, each having an inflator.

(4) In the embodiment described above, the partition portion 26 is configured to have a check valve structure, but the present invention is not limited to this. For example, other structures using rectifying cloth may be used.

(5) In the above-described embodiment, the front passenger seat 12 is provided on the left side of the vehicle in the vehicle width direction. It can also be mounted on the passenger seat provided on the right side.

(6) Further, the present invention can be implemented with various modifications without departing from the scope of the invention. In addition, it goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

10, 10A, 10B, 10C Passenger seat airbag device 12 Passenger seat (seat)
22 main bag 24 sub bag 24A sub bag 24B sub bag 24C sub bag 25 center bag 26 partition 27 fur side bag (side bag)
42 seat belt (three-point seat belt)
44 Buckle P Crew

Claims (5)

a main bag that inflates and deploys on the front side of the vehicle for an occupant wearing a three-point seat belt on a front passenger seat and restrains the occupant in the event of a vehicle collision or when a vehicle collision is predicted;
a sub-bag projecting rearward of the vehicle from a rear end portion of the main bag when inflated and deployed in a region corresponding to the lower ribs of the occupant on the buckle side of the three-point seat belt;
passenger seat airbag device including; 2. The passenger seat airbag device according to claim 1, wherein the sub-bag is formed integrally with the main bag. further comprising a center bag integrally formed inside the main bag in the vehicle width direction and protruding rearward of the vehicle from a rear end portion of the main bag when the main bag is inflated and deployed,
3. The passenger seat airbag device according to claim 2, wherein the sub-bag is formed integrally with the center bag. 4. The front passenger seat airbag device according to claim 2, further comprising a partition portion that partitions between the main bag and the sub-bag and holds the internal pressure of the sub-bag. further comprising a side airbag provided in the seat on which the occupant sits and inflating and deploying on the side of the occupant on the buckle side at the time of the vehicle collision or when the vehicle collision is predicted;
2. A passenger seat airbag device according to claim 1, wherein said subbag is formed integrally with said side airbag and is interposed between an occupant and said main bag during said inflation and deployment.

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