JP3672794B2 - Side airbag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag device that protects an occupant from an impact at the time of an automobile collision, and more particularly to a side airbag device that protects an occupant's chest and head against an impact from a side.
[0002]
[Prior art]
A side airbag device that protects an occupant's chest and head against an impact from the side of a vehicle body is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-273693. The inflator that blows out the air is stored in one side of the seat back, that is, on one side of the back of the occupant sitting on the seat, and as shown in FIG. The airbag 21 is configured to inflate and deploy from the upper side of the seat back 22 forward and upward by the gas ejected from the inflator at the time of a collision, and protect each side of the chest and head of the occupant. .
[0003]
By the way, in the airbag 21 as shown in FIG. 4, when the seat on which the occupant sits is rearwardly adjusted, the rear portion of the airbag 21 is drawn from the shoulder anchor 24 of the seat belt device when the airbag 21 is inflated and deployed. There is a problem that there is a possibility that the case where the airbag 23 is interfered with the belt 23 and the airbag 23 is swung forward as indicated by an imaginary line and the head protection area cannot be secured sufficiently.
[0004]
In order to solve such a problem, for example, in Japanese Patent Application Laid-Open No. 9-123864 and Japanese Patent Application Laid-Open No. 10-287195, a part that may interfere with a seat belt of an airbag is rubbed and a head protecting part is provided. A projecting rearward is disclosed. Referring to FIG. 5, an example disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-123864 will be described. In the illustrated example, the head is mounted on the casing 25 so that there is no risk of the arms repelling when the airbag is inflated and deployed. A protective airbag 26 and a chest protective airbag 27 are individually mounted, and the head protective airbag 26 is inflated upward in a slightly inclined state toward the front as a whole, and an intermediate portion thereof. The rear part of the head is greatly scooped so as to avoid interference with the seat belt 23, and the head protection part on the upper part of the rear part is greatly projected rearward.
[0005]
In such a configuration, the gas ejected into the head protection airbag 26 by the operation of the inflator due to the impact from the side first flows diagonally forward and upward as indicated by the arrow, and the head protection portion The direction is changed from the front part to the rear part and flows into the rear part of the head protection part, the head is protected in an inflated and deployed state avoiding interference with the seat belt 23, and at the same time, the chest protection airbag 27 is also moved forward. Inflated and deployed to protect the chest.
[0006]
[Problems to be solved by the invention]
However, in the side airbag apparatus configured as shown in FIG. 5, when the head protection airbag 26 is inflated and deployed, the jet gas changes direction at the front part of the head protection part and then flows to the rear part. There is a possibility that a delay may occur in the rear portion of the head protection portion in a predetermined inflated state, and the protruding portion of the head protection portion to the rear is the seat belt 23 when the head protection airbag 26 is inflated and deployed. In that case, there is a high possibility that it will not be in the proper deployment state at the required timing, and there is a possibility that the head protection may not be sufficient, while conversely inflating and deploying smoothly In this case, the gas flow may collide with the rear part of the head protecting part, and the inertial force may cause the head protecting airbag to move backward, which may result in failure to properly protect the head. There is a problem.
[0007]
In view of the above-described conventional problems, an object of the present invention is to provide a side airbag device that can reliably protect the head without being adversely affected even when it interferes with a seat belt during inflation and deployment.
[0008]
[Means for Solving the Problems]
Side air bag device of the present invention is disposed on the side of the seat back a side air bag device for protecting an occupant's chest and head against side impact air bag, base and The head has a shape having a head protecting portion that inflates and expands substantially upward from the base toward the side of the occupant's head and a chest protection portion that inflates and expands substantially forward from the base toward the side of the occupant's chest. The part protection part has a shape that has a protruding part at the rear at the part corresponding to the head, and is provided with substantially vertical partitioning means at a substantially central position in the front-rear direction of the part corresponding to the head. The gas flow toward is separated into the gas flow toward the first half and the gas flow toward the second half so that they merge near the top . The partition means may be configured by arranging a rectifying cloth between the bag cloths on both sides of the airbag, or may be formed by a sewing line obtained by sewing the bag cloths on both sides.
[0009]
According to this, when an impact is applied from the side, the chest protection part and the head protection part of the airbag are inflated and deployed forward and upward respectively to protect the occupant's chest and head side, and the head in the protective portion, in Rukoto gas flow toward the top by a partition means is rectified causes no blur deployment behavior of the head protecting portion, is secured stable inflated and deployed, and the gas flow toward the head protecting portion Are separated into those heading toward the first half and those heading toward the second half, and merge near the top, so even if the seat belt interferes with the rear part of the head protection part by positioning the seat on which the occupant sits backward, It is difficult to cause a time delay in the gas flow that flows toward the latter half of the head protection part, and it has an overhanging part at the rear, so if the head protection part moves forward due to interference with the seat belt Head is effectively protected.
[0010]
Further, when the partition means is provided in a V shape that opens upward from below, the gas flow toward the rear half of the head protection portion is more strongly guided toward the rear. The delay is less likely to occur, and the head is more effectively protected when the seat belt interferes.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a side airbag device of the present invention will be described with reference to FIGS. 1 and 2.
[0012]
In FIG. 1, reference numeral 1 denotes a side airbag device disposed on a side portion of a seatback 2, and the airbag 3 is disposed in a housing 4 together with an inflator (not shown) in a folded state. When the side airbag device 1 receives an impact from the side during a side collision, gas is ejected from the inflator, the airbag 3 is inflated and deployed forward and upward, and the chest and head of the occupant M indicated by phantom lines It is comprised so that the side of a part may be protected.
[0013]
The airbag 3 includes a rear base portion 5 of a shoulder portion or a lower heel portion of an occupant M sitting on a seat, and a head protection portion 6 that inflates and expands substantially upward from the base portion 5 toward a side portion of the occupant M's head. And a chest protection portion 7 that expands and expands substantially forward from the base 5 toward the side of the chest of the occupant M. The head protection portion 6 is formed in a shape corresponding to the head and has a protruding portion 8 on the rear side, and a wedge-shaped portion 9 that narrows toward the tip is formed on the top of the head protection portion 6. . The chest protection portion 7 is formed in a substantially semi-oval shape from the base portion 5 and is smoothly connected to the head protection portion 6 in an arc shape.
[0014]
The head protection part 6 of the airbag 3 is provided with partition means 10 in the substantially vertical direction at a substantially central position in the front-rear direction of the part corresponding to the head. As shown in FIG. 1 (b), the partition means 10 is configured by disposing a V-shaped rectifying cloth 11 that opens upward from below between the bag cloths 3 a and 3 b on both sides of the airbag 3. Yes. The V-shaped rectifying cloth 11 may be formed by arranging two cloths in a V shape or by bending one cloth in a V shape as shown in the figure.
[0015]
In the above configuration, when the inflator is actuated by the impact from the side, the head protecting portion 6 and the chest protecting portion 7 of the airbag 3 bulge and expand from the base portion 5 substantially upward and substantially forward by the jet gas. . At that time, the gas flow toward the top of the head protecting portion 6 is separated into the first half and the second half by the partitioning means 10 as shown by the arrows in FIG. No fluctuation occurs in the unfolding behavior of 6, and stable expansion and deployment is ensured. Thus, as shown by the solid lines in FIGS. 1 and 2, there is no fear of the occupant M's arms being flipped up, and the head protection part 6 and the chest protection part 7 that are unfolded both stabilize the head and chest of the occupant M. Protected.
[0016]
Further, when the seat on which the occupant M sits is rearwardly adjusted, even when the seat belt 13 fed out from the shoulder anchor 14 interferes with the rear portion of the airbag 3 as shown by a broken line in FIG. As described above, the gas flow toward the first half is separated into the one toward the first half and the one toward the second half and merges in the vicinity of the top, so that the gas flow flowing toward the second half of the head protection portion 6 is time-dependent. Since the top part of the head protection part 6 is made into the wedge-shaped part 9, the possibility of being caught on the seat belt 13 at the time of inflating and developing can be reduced, and the head can be inflated and deployed reliably and smoothly. Since the portion protection portion 6 has a protruding portion 8 on the rear side, as shown by the phantom line in FIG. 2, even if the head protection portion 6 is slightly moved forward due to the interference of the seat belt 13, Department is effectively protected.
[0017]
Moreover, in this embodiment, since the partition means 10 is comprised by the V-shaped rectification | straightening cloth 11 which opens upwards from the downward direction, the gas flow toward the second half part of the head protection part 6 is stronger, and it guides it toward back. Therefore, a time delay is less likely to occur in the gas flow flowing toward the second half, and the head is more effectively and effectively protected when the seat belt 13 interferes.
[0018]
In the above embodiment, an example in which the V-shaped rectifying cloth 11 is disposed between the bag cloths 3a and 3b on both sides of the airbag 3 as the partition means 10 has been shown. However, as another simpler embodiment, FIG. As shown, a planar rectifying cloth 12 may be provided. However, in the V-shaped rectifying cloth 11, the gas flow is more strongly guided toward the latter half of the head protecting portion 6, so that the time delay around the gas in the latter half can be eliminated.
[0019]
Furthermore, instead of the rectifying cloths 11, 12, the partition means 10 may be configured by sewing lines obtained by sewing the bag cloths 3 a, 3 b on both sides of the airbag 3 into a V shape or a straight line.
[0020]
【The invention's effect】
According to the side airbag device of the present invention, as described above, the airbag is inflated and deployed substantially upward from the base and the base toward the side of the occupant's head and from the base to the occupant's chest. A portion having a chest protection portion that expands and expands substantially forward toward the side, and a portion corresponding to the head, with the head protection portion having a protruding portion at the rear at a portion corresponding to the head Since the partition means in the almost vertical direction is provided at the substantially central position in the front-rear direction, the gas flow toward the top of the head protection part is rectified by the partition means, so that the expansion behavior of the head protection part does not fluctuate and is stably expanded. Even if the seat belt interferes with the rear part of the head protection part, the deployment is ensured and the gas flow toward the head protection part is separated into the one toward the front half and the gas flow toward the latter part and merges near the top. , Head protection The gas flow that flows toward the second half of the minute is less likely to be delayed in time, and has a protruding part at the rear, so even if the head protection part moves forward due to interference with the seat belt, Is effectively protected.
[0021]
Further, when the partition means is provided in a V shape that opens upward from below, the gas flow toward the rear half of the head protection portion is more strongly guided toward the rear, so that the gas flow flowing toward the rear half is time consuming. Delay is less likely to occur, and the head is reliably protected more effectively when the seat belt interferes.
[Brief description of the drawings]
1A and 1B show an embodiment of a side airbag device of the present invention, in which FIG. 1A is a side view showing an inflated and deployed state of an airbag, and FIG. 1B is a sectional view taken along line AA in FIG. .
FIG. 2 is an explanatory view of an inflated and deployed state of the airbag when the seat position is changed in the embodiment.
FIG. 3 is a side view showing an inflated and deployed state of an airbag in another embodiment of the side airbag device of the present invention.
FIG. 4 is a side view showing an inflated and deployed state of an airbag in a conventional side airbag device.
FIG. 5 is a side view showing an inflated and deployed state of an airbag in a side airbag device of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side airbag apparatus 2 Seat back 3 Air bag 6 Head protection part 8 Overhang | projection part 10 Partition means 11 V-shaped rectification cloth

Claims (2)

A side airbag device that is disposed on a side portion of a seat back and protects an occupant's chest and head against an impact from a side, the airbag being configured from the base and the base to the side of the occupant's head The head protection part that inflates and deploys substantially upward toward the head and the chest protection part that inflates and deploys substantially forward from the base toward the side of the occupant's chest, and the head protection part corresponds to the head And a part with an overhanging part at the rear, and a partition means in the vertical direction is provided at a substantially central position in the front-rear direction of the part corresponding to the head, and the gas flow toward the head protection part is directed to the front half The side airbag device is characterized in that the air bag device is separated into a portion toward the rear half and merges near the top .   2. The side airbag device according to claim 1, wherein the partitioning means is provided in a V shape that opens upward from below.

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