JP5954268B2 - Crew head restraint airbag device - Google Patents

Description

  The present invention relates to an occupant head restraint airbag device.

  As a vehicle side impact protection device, an air bag is stored on both sides of the headrest or above the seat back and on both sides of the headrest, and an air cylinder is disposed in the seat cushion, and the air bag and the air cylinder are connected by a pipe. Such a structure is disclosed (see Patent Document 1).

  Further, a structure is disclosed in which the airbag is inflated obliquely forward from the side of the headrest at the time of side collision or oblique collision (see Patent Document 2).

Japanese Utility Model Publication No. 58-130850 JP-A-8-175309

  In recent years, curtain airbags corresponding to side collisions and rollovers have become widespread. Since the curtain airbag needs to be inflated and deployed in a limited space, it is difficult to increase the thickness of the bag when inflated. Since the occupant's head is not restrained until it comes into contact with the curtain airbag, the thinner the curtain airbag, the greater the amount of movement of the head.

  On the other hand, as means for restraining the occupant's head at the time of a side collision, there is a headrest airbag that inflates and deploys on both sides of the occupant's head from a headrest or the like, as in the conventional example described above. However, there is no consideration for combining this with a curtain airbag. Moreover, even if a headrest airbag and a curtain airbag are simply combined, it is considered that interference between the airbags occurs.

  In view of the above facts, the present invention has an object to reduce the load on the head of an occupant during a side collision.

  The invention according to claim 1 (occupant head restraint airbag device) is accommodated along the roof side rail, and can be inflated and deployed in the form of a curtain between the vehicle side and the occupant upon receipt of gas supply at the time of a side collision. A curtain air bag configured and a headrest of the occupant's seat are inflated and deployed on both sides of the occupant's head in the vehicle width direction in response to gas supply at the time of a side collision, preceding the curtain airbag. And a headrest airbag configured to do so.

  In the occupant head restraint airbag device according to the first aspect, at the time of a side collision, the headrest airbag is inflated and deployed on both sides of the occupant's head in the vehicle width direction prior to the curtain airbag. The curtain airbag is inflated and deployed in a curtain shape between the vehicle side and the occupant. Therefore, interference between the headrest airbag and the curtain airbag is unlikely to occur, and the inflation and deployment of each airbag can be completed at an early stage. In addition, the headrest can be restrained by the headrest airbag before the occupant's head abuts against the curtain airbag, and the lateral movement of the head can be suppressed. For this reason, it is possible to reduce the load on the occupant's head at the time of a side collision.

  According to a second aspect of the present invention, in the occupant head restraint airbag device according to the first aspect, the curtain airbag is rolled and stored outward in the vehicle width direction.

  In the occupant head restraint airbag device according to claim 2, the curtain airbag is inflated and deployed along the side of the vehicle body at the time of a side collision. For this reason, interference with a curtain airbag and a headrest airbag can further be suppressed.

  According to a third aspect of the present invention, in the occupant head restraint airbag device according to the first or second aspect, the headrest airbag includes an outer bag portion positioned outside the occupant in the vehicle width direction. An inner bag portion positioned on the inner side in the vehicle width direction of the head, and a cylindrical duct that communicates with the outer bag portion and the inner bag portion and connects the outer bag portion and the inner bag portion. .

  In the occupant head restraint airbag device according to the third aspect, when the headrest airbag is inflated and deployed, the outer bag portion and the inner bag portion are inflated and deployed in a state where they are connected to each other by a cylindrical duct. The occupant's head is restrained by the outer bag portion and the inner bag portion. When the internal pressure of the duct increases and the rigidity of the duct increases, the outer bag portion hardly tilts outward in the vehicle width direction, and the inner bag portion hardly tilts inward in the vehicle width direction. For this reason, the restraint performance of a passenger | crew's head can be improved.

  According to a fourth aspect of the present invention, in the occupant head restraint airbag device according to the third aspect, the duct and the portion of the outer bag portion and the inner bag portion on the vehicle front side from the duct are respectively tethered. It is connected.

  In the occupant head restraint airbag device according to claim 4, since the outer bag portion and the inner bag portion are respectively connected to the duct by the tether, the outer bag portion and the inner bag portion are difficult to tilt in the vehicle width direction. . For this reason, the restraint performance of a passenger | crew's head can further be improved.

  As described above, according to the occupant head restraint airbag device of the first aspect, it is possible to obtain an excellent effect that the load on the occupant's head at the time of a side collision can be reduced.

  According to the passenger | crew head restraint airbag apparatus of Claim 2, the outstanding effect that interference with a curtain airbag and a headrest airbag can be suppressed further is acquired.

  According to the passenger | crew head restraint airbag apparatus of Claim 3, the outstanding effect that the restraint performance of a passenger | crew's head can be improved is acquired.

  According to the passenger | crew head restraint airbag apparatus of Claim 4, the outstanding effect that the restraint performance of a passenger | crew's head can be further improved is acquired.

(A) It is sectional drawing which looked at the state which the inflation deployment of the headrest airbag completed and the curtain airbag began to expand and deploy from the vehicle front side. (B) It is sectional drawing which looked at the state which the expansion | deployment deployment of the curtain airbag was completed from the vehicle front side. It is a perspective view which shows the headrest airbag at the time of inflation deployment. It is a cross-sectional view showing a state where the head of an occupant is restrained by the inflated and deployed headrest airbag and curtain airbag. It is a cross-sectional view showing a headrest airbag inflated and deployed in a modification in which a duct is located in the headrest.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1A and 1B, an occupant head restraint airbag device 10 according to the present embodiment includes a curtain airbag 12 and a headrest airbag 14.

  The curtain airbag 12 is housed in a roll-folded manner along the roof side rail 16 of the vehicle 15, for example, outward in the vehicle width direction. The curtain airbag 12 is configured to receive a gas supply from, for example, an inflator (not shown) at the time of a side collision, and to be inflated and deployed in a curtain shape between a side glass 40 that is an example of a vehicle side portion and an occupant 18. ing. When the curtain airbag 12 is inflated and deployed, the lower end of the curtain airbag 12 overlaps with, for example, a door trim 42 which is an interior part in the vehicle width direction.

  The headrest airbag 14 is accommodated in the headrest 22 of the seat 20 for the occupant 18, receives a gas supply from, for example, the inflator 28 at the time of a side collision, and is installed on both sides of the head 18H of the occupant 18 in the vehicle width direction. 12 is configured to inflate and deploy prior to 12. In other words, the inflation and deployment of the headrest airbag 14 is completed earlier than the curtain airbag 12. Since the headrest airbag 14 has a smaller volume than the curtain airbag 12, even if the curtain airbag 12 and the headrest airbag 14 start to be inflated and deployed at the same time, the headrest airbag 14 is easier to complete deployment earlier. Note that the inflation / deployment start timing of the headrest airbag 14 may be set earlier than the inflation / deployment start timing of the curtain airbag 12. Further, the inflation / deployment start timing of the curtain airbag 12 may be delayed without changing the inflation / deployment start timing of the headrest airbag 14.

  2 and 3, the headrest airbag 14 has an outer bag portion 24, an inner bag portion 26, and a cylindrical duct 30. As shown in FIG. 3, the outer bag portion 24 is a portion located on the outer side in the vehicle width direction of the head 18H of the occupant 18 when the headrest airbag 14 is inflated and deployed. This is a portion located on the inner side in the vehicle width direction of 18H. The outer bag portion 24 and the inner bag portion 26 are preferably inflated and deployed from the front end of the head portion 18H to the vehicle front side so as to cover the side of the head portion 18H of the occupant 18 as a whole.

  The duct 30 communicates with the outer bag portion 24 and the inner bag portion 26 and connects the outer bag portion 24 and the inner bag portion 26. The duct 30 is formed near the vehicle upper side of the headrest airbag 14. The cross sectional area of the duct 30 is set smaller than the cross sectional areas of the outer bag portion 24 and the inner bag portion 26. The duct 30 is provided with a gas introduction part 32, and an inflator 28 is connected to the gas introduction part 32. As shown in FIG. 3, the duct 30 bulges from the inside of the headrest 22 to the vehicle rear side when the airbag 12 is inflated and deployed. As shown in FIG. 4, the duct 30 may be located inside the headrest 22 when the airbag 12 is inflated and deployed.

  The duct 30 and the portions of the outer bag portion 24 and the inner bag portion 26 that are closer to the vehicle front side than the duct 30 are connected by tethers 34 and 36, respectively. The tethers 34 and 36 are made of a non-extensible material. The front end 34F of the tether 34 is sewn on the upper surface of the outer bag portion 24, and the rear end 34R is sewn on the upper surface of the duct 30. Similarly, the front end 36F of the tether 36 is sewn on the upper surface of the inner bag portion 26, and the rear end 36R is sewn at a position overlapping the upper surface of the duct 30 and the rear end 34R of the tether 34. The position of the front end 34 </ b> F of the tether 34 is desirably as far as possible in the front of the vehicle in the outer bag portion 24. Similarly, it is desirable that the position of the front end 36F of the tether 36 is as far forward as possible in the vehicle of the inner bag portion 26.

  As shown in FIG. 1A, in order to prevent the tethers 34 and 36 from interfering with the head 18H of the occupant 18, the upper surface of the headrest airbag 14 provided with the tethers 34 and 36 is It is located above the top of the head 18H. The duct 30 is formed near the vehicle upper side of the headrest airbag 14 in consideration of the arrangement of the tethers 34 and 36 in this way.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. 1A, in the occupant head restraint airbag device 10 according to the present embodiment, the headrest airbag 14 precedes the curtain airbag 12 and the vehicle width of the head 18H of the occupant 18 at the time of a side collision. Inflate and deploy in both directions. As shown in FIGS. 3 and 4, when the headrest airbag 14 is inflated and deployed, the outer bag portion 24 and the inner bag portion 26 are inflated and deployed while being connected to each other by a cylindrical duct 30. The head portion 18H of the occupant 18 is restrained by the outer bag portion 24 and the inner bag portion 26.

  As shown in FIG. 1A, the curtain airbag 12 is inflated and deployed in a curtain shape between the side glass 40 and the occupant 18. Since the curtain airbag 12 is roll-folded outward in the vehicle width direction, the curtain airbag 12 is inflated and deployed along the side glass 40 at the time of inflation and deployment. As shown in FIG. 1B, the lower end of the curtain airbag 12 overlaps the door trim 42 in the vehicle width direction. Thereby, the reaction force with respect to the passenger | crew 18 can be produced.

  Thus, since the headrest airbag 14 is inflated and deployed prior to the curtain airbag 12, interference between the headrest airbag 14 and the curtain airbag 12 hardly occurs. For this reason, the inflation and deployment of each airbag can be completed early. In addition, before the head 18H of the occupant 18 comes into contact with the curtain airbag 12, the headrest 18H is restrained by the headrest airbag 14, and the lateral movement of the head 18H can be suppressed.

  Specifically, the outer bag portion 24 can suppress the head 18H of the occupant 18 from moving outward in the vehicle width direction at the beginning of the collision. Further, the inner bag portion 26 can prevent the head portion 18H from moving inward in the vehicle width direction due to the reaction force from the outer bag portion 24 and the curtain airbag 12. For this reason, the load on the head 18H of the occupant 18 at the time of a side collision can be reduced. Specifically, the influence on the neck due to the head 18H being shaken to the side can be reduced.

  Further, the internal pressure of the duct 30 rises in the same manner as the internal pressure of the outer bag portion 24 and the inner bag portion 26, and the rigidity of the duct 30 increases, so that the outer bag portion 24 and the inner bag portion 26 are inclined in the vehicle width direction. It becomes difficult. Further, since the outer bag portion 24 and the inner bag portion 26 of the headrest airbag 14 are connected to the duct 30 by the tethers 34 and 36, respectively, the outer bag portion 24 is difficult to tilt outward in the vehicle width direction, and the inner bag portion. 26 becomes difficult to tilt inward in the vehicle width direction. For this reason, the restraint performance of the passenger | crew's 18 head 18H can be improved further.

  Since the upper surface of the headrest airbag 14 provided with the tethers 34 and 36 is located above the top of the head 18H of the occupant 18, the tethers 34 and 36 and the occupant 18 when the headrest airbag 14 is inflated and deployed. Interference with the head 18H can be suppressed.

[Other Embodiments]
The expansion and deployment of the curtain airbag 12 and the headrest airbag 14 is not limited to a side collision. The curtain airbag 12 and the headrest airbag 14 are inflated when it is necessary to restrain the occupant 18 from the side, such as when a collision with a pole (not shown) on the side of the vehicle occurs or when a rollover of the vehicle 15 occurs. Can be configured to deploy.

  The attachment points of the rear ends 34 </ b> R and 36 </ b> R of the tethers 34 and 36 may be provided at a site different from the duct 30. This part is, for example, the headrest 22 or a tether (not shown) that connects the outer bag portion 24 and the inner bag portion 26 in the vehicle width direction. In this case, the upper surface of the duct 30 may be lower than the upper surfaces of the outer bag portion 24 and the inner bag portion 26. The same applies when the tethers 34 and 36 are not used. The number of ducts 30 is not limited to one and may be plural.

DESCRIPTION OF SYMBOLS 10 Crew head restraint airbag apparatus 12 Curtain airbag 14 Headrest airbag 16 Roof side rail 18 Crew 18H Head 20 Seat 22 Headrest 24 Outer bag part 26 Inner bag part 30 Duct 34 Tether 36 Tether 40 Side glass (vehicle side part)

Claims (4)

A curtain airbag that is housed along a roof side rail and configured to be inflated and deployed in a curtain shape between a vehicle side and an occupant upon receiving a gas supply at the time of a side collision;
A headrest air that is housed in the headrest of the passenger seat and is configured to inflate and deploy on both sides of the passenger's head in the vehicle width direction in front of the curtain airbag upon receiving a side collision. With a bag,
An occupant head restraint airbag apparatus having   The occupant head restraint airbag device according to claim 1, wherein the curtain airbag is rolled and stored outward in the vehicle width direction. The headrest airbag is
An outer bag portion positioned on the outer side in the vehicle width direction of the head of the occupant;
An inner bag portion located on the inner side in the vehicle width direction of the head;
A cylindrical duct communicating with the outer bag portion and the inner bag portion and connecting the outer bag portion and the inner bag portion;
The occupant head restraint airbag device according to claim 1 or 2, comprising:   The occupant head restraint airbag device according to claim 3, wherein the duct and the portion of the outer bag portion and the inner bag portion that are closer to the vehicle front side than the duct are connected by a tether.

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