JP6137459B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device.

  2. Description of the Related Art Conventionally, in order to protect an occupant by appropriately restraining the occupant's waist during a side collision of the vehicle, an impact absorbing member disposed on the side of the occupant's waist is provided with respect to the inner trim of the vehicle. The thing is known (refer patent document 1). In such an inner trim, an occupant's waist is appropriately restrained by an impact absorbing member provided on the inner trim, and an impact from another vehicle or the like is effectively absorbed.

JP 2007-30563 A

  In the invention described in Patent Document 1, since the occupant's waist is restrained by the impact absorbing member, the occupant's lumbar part comes into contact with the impact absorbing member, and eventually the impact is applied to the lumbar part. However, in order to optimally protect the waist of a small occupant, such as a woman, who has a relatively low pelvic load tolerance, it is necessary to further reduce the impact input, particularly to the iliac and acetabulum.

  Accordingly, an object of the present invention is to solve the above-described problems of the prior art, and to provide a side airbag device that can reduce an impact input to the iliac bone and acetabulum.

A side airbag device according to the present invention includes an airbag main body and gas introduction means for introducing gas into the airbag main body, and the airbag main body stored in a storage portion is connected to a vehicle door by introducing the gas. A side airbag device that is inflated and deployed with an occupant, wherein the airbag main body is positioned at least corresponding to the thigh and buttocks of the occupant seated by introducing the gas from the gas introduction means A first chamber that is deployed to the first chamber, a second chamber that is deployed on the upper side of the first chamber by introducing gas from the first chamber, and a position corresponding to the iliac bone and acetabulum, than said first chamber and said second chamber and a lower expansion rate low expansion unit, the low-expansion unit, especially that provided between the first chamber and the second chamber To.

Since the first chamber and the second chamber are formed and the gas is first introduced into the first chamber, the position corresponding to the first chamber of the occupant can be restrained earlier. In this way, the occupant is restrained earlier, and formed at a position corresponding to the iliac bone and acetabulum, and a low expansion portion having a lower expansion rate than the first chamber and the second chamber is formed. Thereby, the impact input with respect to an iliac bone and an acetabulum can be reduced. In addition, since the first chamber is provided corresponding to the thigh and the buttocks, it is possible to restrain the portion having high load resistance and further improve the safety of the occupant.

The low expansion portion is preferably an opening penetrating in the width direction of the vehicle . If it is an opening, the impact input most with respect to an iliac bone and an acetabulum can be reduced.

  It is preferable that at least a part of the first chamber and the second chamber is partitioned by a conducting portion that conducts when a predetermined pressure is applied. By comprising in this way, the flow of gas can be controlled preferably.

The second chamber is provided with a flow path regulating member so that a gas flow path facing the conduction part is formed along a side wall of the airbag body, and an outer periphery of the low expansion part on the vehicle rear side is provided. It is preferable to follow the flow path regulating member . By comprising in this way, the flow of gas can be controlled more preferably.

  According to the side airbag device of the present invention, it is possible to achieve an excellent effect that the impact input to the iliac bone and the acetabulum can be reduced.

The side surface schematic diagram of the vehicle which shows the expansion | deployment state in the side airbag apparatus concerning Embodiment 1. FIG. 1 is a schematic front view of a vehicle showing a deployed state in a side airbag device according to Embodiment 1. FIG. The schematic diagram for demonstrating the folding process of the airbag main body of Embodiment 1. FIG. The schematic diagram for demonstrating the expansion | deployment process of the airbag main body of Embodiment 1. FIG. The schematic diagram for demonstrating the airbag main body of Embodiment 2. FIG.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the side airbag device 1 includes an airbag main body 2 and an inflator (gas introduction means) 3 for introducing gas into the airbag main body 2. The side airbag device 1 is folded and housed on the side of the seat back 5 of the seat 4 so that it can be deployed earlier as described in detail later. The side airbag device 1 is activated when the vehicle I predicts or detects a side collision, and gas is ejected from the inflator 3 so that the airbag body 2 is interposed between the occupant and the door 6 while being inflated. It is configured as follows. By this side airbag device 1, it is possible to absorb an impact at the time of a side collision of the vehicle I and protect an occupant.

  The airbag main body 2 is provided so as to be deployed from the shoulder portion of the occupant seated on the seat 4 to correspond to the buttocks and thighs in a side view. The airbag body 2 has a rectangular outer shape, and includes a first chamber 21, a second chamber 22, and an opening 23 defined by the first chamber 21 and the second chamber 22.

  The first chamber 21 is provided so as to expand corresponding to the buttocks and thighs of the seated occupant, and the second chamber 22 deploys corresponding to the shoulder, chest and abdomen of the seated occupant. It is provided as follows. The opening 23 is formed corresponding to the iliac bone B1 and the acetabulum B2.

  In the side airbag device 1, the airbag body 2 is deployed between the door trim 61 of the door 6 and the seated passenger as shown in FIG. 2. Specifically, the side airbag device 1 of the present embodiment restrains the occupant by deploying the first chamber 21 and the second chamber 22 in this order by the gas from the inflator 3 and bringing them into contact with the occupant. However, since the airbag body 2 does not contact the iliac bone B1 and the acetabulum B2 of the occupant by having the opening 23, an impact is not input to them. Thereby, for example, a small occupant having low impact resistance of the pelvis such as a woman can be more appropriately protected from the impact caused by the side collision.

  Hereinafter, the airbag body 2 will be specifically described.

  As described above, an opening 23 is formed on the lower side of the center of the airbag body 2 so as to correspond to the iliac bone and acetabulum of the occupant. The opening 23 penetrates the airbag body 2. In the present embodiment, the opening 23 has an elliptical shape in front view.

  As described above, the first chamber 21 is formed at the lower end of the airbag body 2 so as to correspond to the thigh and the buttocks. An inflator is connected to the first chamber 21 via an inflator connecting portion 24 provided at an end portion on the vehicle rear side. That is, in this embodiment, the inflator is provided at the lower part of the airbag body 2, and gas flows directly into the first chamber 21 from the inflator. The first chamber 21 extends from the inflator connecting portion 24 along the inflow direction of gas from the inflator (hereinafter referred to as the first direction X). In the present embodiment, the first chamber 21 is formed with the same width as the inflator connecting portion 24. The first chamber 21 has a smaller capacity than the second chamber 22.

  As described above, the second chamber 22 is formed on the upper side of the airbag body 2 from the first chamber 21 so as to correspond to the shoulder, chest, and abdomen. The second chamber 22 extends from the first chamber 21 along a direction perpendicular to the first direction X (hereinafter, referred to as a second direction Y).

  An opening 23 is formed between the first chamber 21 and the second chamber 22. That is, on the outer periphery of the opening 23, the second chamber 22 is formed on the upper side thereof, and the first chamber 21 is formed on the lower side thereof. Therefore, it can be said that the first chamber 21 and the second chamber 22 are connected at the outer periphery of the opening 23.

  Stitches are provided in regions where the first chamber 21 and the second chamber 22 are connected to partition the first chamber 21 and the second chamber 22. Of the stitches that divide the first chamber 21 and the second chamber 22, the first stitch (conduction portion) 31 includes an opening 23 and a wall surface on the vehicle rear side of the airbag body 2 (a wall surface on the inflator connection portion 24 side). It is a partition part which divides the 1st chamber 21 and the 2nd chamber 22 between. Further, the second stitch 32 partitions the first chamber 21 and the second chamber 22 between the opening 23 and a wall surface on the vehicle front side of the airbag body 2 (a wall surface on the opposite side to the inflator connecting portion 24). It is a partition part. The first stitch 31 and the second stitch 32 have the same horizontal position in the airbag body 2.

  The first stitch 31, which is a stitch that defines the first chamber 21, is configured to be broken at a predetermined pressure. When the first chamber 21 is filled with gas and the pressure in the first chamber increases, the first chamber 21 is broken, and the location where the first stitch 31 is provided becomes a gas passage, and the first chamber 21 and the second chamber 22 are separated from each other. Conducts at the part. The second stitch 32 is not broken even when a predetermined pressure is applied. Since the state shown in FIGS. 1 and 2 is after the expansion and deployment, the first stitch 31 has already been broken.

  The gas flows into the second chamber 22 from the first chamber 21 when the first stitch 31 is broken. The second chamber 22 is formed with a flow path regulating stitch 33 for regulating the flow of the gas that has flowed in. The flow path regulating stitch 33 faces the first stitch 31 between the flow path regulating stitch 33 and the side wall (side wall on the inflator 3 side) of the airbag body 2 in the second direction Y of the airbag body 2 (FIG. 3). The gas flow path 34 is formed along the reference). In this embodiment, the flow path restriction stitch 33 is provided so as to be parallel to the side wall of the airbag body 2, and the upper end of the flow path restriction stitch 33 is separated from the ceiling wall of the airbag body 2. Yes. Therefore, in the present embodiment, the flow passage restriction stitch 33 is provided, so that the gas from the first chamber 21 can travel along the second direction Y.

  In the airbag main body 2, the gas from the inflator 3 first flows into the first chamber 21 to inflate the first chamber 21. As a result, the first stitch 31 is broken and flows into the second chamber 22. The gas flowing into the second chamber 22 passes through the gas flow path 34 formed by the flow path restriction stitch 33 and flows from the upper end of the flow path restriction stitch 33 to the remaining portion of the second chamber 22 on the vehicle front side. Thereby, the second chamber 22 expands. In this case, the opening 23 does not expand.

  Thus, in the airbag main body 2 of the present embodiment, the first chamber 21 and the second chamber 22 are inflated and deployed by the gas from the inflator 3. On the other hand, since the gas does not flow into the opening 23 formed corresponding to the iliac bone and the acetabulum, the airbag body 2 does not contact. Therefore, since no impact is input to the iliac bone and acetabulum at the time of a side collision, it is possible to more appropriately protect a small occupant such as a woman who has a relatively low pelvic load resistance.

  Moreover, in the airbag main body 2 of this embodiment, it expand | deploys by gas flowing into the 1st chamber 21 from the inflator 3 first, and restrains a passenger | crew's thigh and buttocks early. Since the load resistance of the thigh and hips is higher than that of the iliac bone and acetabulum, the safety of the occupant can be further improved by constraining this region early.

  In this case, since the first chamber 21 is formed smaller than the second chamber 22, the first chamber 21 is more likely to expand earlier, and the thigh and buttocks of the occupant can be moved earlier. It is possible to restrain.

  Moreover, since the distance to the door trim 61 is shorter than the chest or abdomen, the shoulder is required to protect the shoulder earlier, but the gas flow path 34 is formed in the second chamber 22. The gas can reach the position corresponding to the shoulder of the second chamber 22 at an early stage.

  A folding method that allows the airbag body 2 to be deployed earlier will be described below. As shown in FIG. 3 (1), the first stitch 31 is not torn in the state before being folded, and the first chamber 21 and the second chamber 22 have the first stitch 31 and the second stitch on the outer periphery of the opening 23. It is partitioned by two stitches 32.

  As shown in FIG. 3 (2), with respect to the airbag body 2, first, the second chamber 22 is folded toward the first chamber 21 along the second direction Y. In the present embodiment, the folding is performed by so-called winding which is performed by winding the end of the second chamber 22 inward. As shown in FIG. 3 (3), the folding of the second chamber 22 is finished leaving only the first chamber 21. The second chambers 22 are all folded along the second direction.

  Next, as shown in FIG. 3 (4), the first chamber 21 and the folded second chamber 22 are moved in the second direction Y toward the inflator connecting portion 24 with the end of the first chamber 21 inward. It folds by winding and folding.

  In this way, as shown in FIG. 3 (5), the airbag main body 2 is brought into the accommodated state.

  Such an airbag body 2 is deployed as follows when a side collision is detected.

  As shown in FIGS. 4 (1) and (2), gas flows from the inflator 3 through the inflator connecting portion 24 into the airbag body 2 in the stored state. Since the first chamber 21 extends along the flow of the gas in the first direction X and is folded along the first direction X, the gas is not hindered to flow and easily flows. For this reason, the first chamber 21 can be deployed early toward the front of the vehicle.

  Then, as shown in FIG. 4 (3), when the first chamber 21 expands in the first direction X and the first chamber 21 is filled with gas, as shown in FIG. Torn. Accordingly, the gas flow changes so that the gas flow flows from the first chamber 21 in the second direction Y, that is, upward. The gas passes through the gas flow path 34 formed along the second direction Y by the flow path restriction stitch 33 from the first chamber 21 and is introduced into the second chamber 22. The second chamber 22 extends along the flow of the gas in the second direction Y, and is folded along the second direction Y, so that the gas is not obstructed and flows. Cheap. For this reason, the second chamber 22 can also be deployed early toward the upper side of the vehicle.

  In this way, as shown in FIG. 4 (5), the airbag body 2 is fully deployed while the opening 23 is kept penetrating.

  Thus, in the present embodiment, the airbag body 2 is partitioned into the first chamber 21 and the second chamber 22. The first chamber 21 extends from the inflator connection portion 24 along the first direction X, and is folded along the first direction X in which gas flows from the inflator connection portion 24, so that the first direction. Easy to deploy when gas flows into X.

  The second chamber 22 extends from the first chamber 21 along the second direction Y, and the second chamber 22 is also folded along the second direction Y through which gas flows from the first chamber 21. Therefore, it is easy to expand when the gas flows in the second direction Y. In this case, in particular, since the gas flow path 34 extending in the second direction Y is formed by the flow path restriction stitch 33, the second chamber 22 is more easily developed. Moreover, the gas can reach the position corresponding to the shoulder portion of the second chamber 22 earlier by the flow path restriction stitch 33, and the shoulder portion can be restrained and protected earlier.

  Although Embodiment 1 mentioned above also demonstrated the folding method of the airbag main body 2, it is not limited to this. Although other folding methods may be used, it is preferable to fold as in the present embodiment because it can be inflated and deployed earlier to restrain and protect the occupant.

  In Embodiment 1 mentioned above, the opening 23 is provided over the 1st chamber 21 and the 2nd chamber 22, However, It is not limited to this. The positions of the first stitch 31 and the second stitch 32 may be shifted upward in the vehicle so that the opening 23 is formed in the first chamber 21, and the opening 23 is formed in the second chamber 22. The positions of the first stitch 31 and the second stitch 32 may be shifted downward in the vehicle. The positions of the first stitch 31 and the second stitch 32 can be set in consideration of the capacity of the first chamber 21 for deploying the first chamber 21 earlier and the part that the occupant wants to protect. . In addition, it is preferable that the periphery of the opening 23 is developed first because the periphery of the opening 23 can be fixed earlier.

  In the present embodiment, the horizontal positions of the first stitch 31 and the second stitch 32 are the same, but the present invention is not limited to this. The horizontal positions of the first stitch 31 and the second stitch 32 may be shifted, but when folded as in the present embodiment, it is preferable that the horizontal positions are the same in order not to disturb the gas flow.

  In the present embodiment, the second stitch 32 that divides the first chamber 21 and the second chamber 22 is made of a stitch that does not break, but the present invention is not limited to this. The second stitch 32 may also be configured to be a stitch that is torn when a predetermined pressure is applied. In this case, it is preferable to add a flow path regulating stitch so that a gas flow path facing the second stitch can be formed. If there is no flow path regulating stitch, the gas that has flowed into the second chamber 22 does not flow along the second direction Y, so that it is difficult to develop it at an early stage.

  Further, in the present embodiment, when it is desired to reliably restrain and protect the shoulder portion earlier, the second chamber is further divided into a plurality of portions, the second chamber corresponding to the shoulder portion, and the second chamber corresponding to the chest portion and the abdominal portion. It is also possible to form three chambers and partition them with stitches that can be broken at a predetermined pressure.

(Embodiment 2)
This embodiment is different from the first embodiment in the configuration of the chamber of the airbag main body 2A.

  As shown in FIG. 5, the airbag main body 2A includes a first chamber 21A and a second chamber 22A. The first chamber 21A is provided so as to correspond to the shoulder of the seated occupant, and the second chamber 22A is provided so as to correspond from the chest of the seated occupant to the thigh to the buttocks. The opening 23A is provided so as to correspond to the iliac bone and acetabulum of the seated passenger. Since the iliac bone and the acetabulum are included from the chest to the thigh to the buttocks corresponding to the second chamber 22A, in this embodiment, the opening 23A is provided in the second chamber 22A. It becomes.

  The first chamber 21A extends along the first direction X, which is the inflow direction of gas from the inflator, from the inflator connecting portion 24A to the upper part of the airbag body 2A. That is, in this embodiment, the inflator is provided on the upper part of the airbag main body 2A. The second chamber 22A extends from the first chamber 21A along the second direction Y orthogonal to the first direction X, that is, downward. The first chamber 21A and the second chamber 22A are partitioned by a first stitch 31A that is torn when a predetermined pressure is applied and a second stitch 32A that is not torn.

  The second chamber 22A is provided with a flow path regulating stitch 33A so as to constitute a gas flow path 34 facing the first stitch 31A. The lower end of the flow path regulating stitch 33A is provided so as to be separated from the bottom wall of the airbag body 2A. Also in this embodiment, the capacity of the first chamber 21A is smaller than that of the second chamber 22A.

  In this embodiment, the airbag main body 2A is configured to restrain and protect the seated occupant's shoulders at the earliest stage, and to prevent the iliac bone and acetabulum from receiving an impact.

  That is, when the gas from the inflator first flows into the first chamber 21A and the gas is filled in the first chamber 21A, the pressure in the first chamber 21A exceeds a predetermined pressure, so the first stitch 31A is broken and the gas is released. The flow is changed in the second direction Y and flows into the second chamber 22A. Since the flow restricting stitch 33A is formed in the second chamber 22A, the flow of gas is restricted, the gas flows in the second direction Y, and then flows from the lower side of the opening 23A to the remaining portion of the second chamber 22A.

  As described above, the airbag main body 2A prevents the iliac bone and the acetabulum from receiving an impact, and the distance to the door trim is short, so that the shoulder portion to be restrained earlier corresponds to the shoulder portion early. Since gas flows through the first chamber 21A, it is possible to protect earlier.

  The airbag main body 2A can be folded in any way, but as in the first embodiment, the second chamber 22A is first folded toward the first chamber 21A so as to be wound inside by folding. Go. When winding of the second chamber 22A is completed, the first chamber 21A is folded so that the end is wound inward toward the inflator connecting portion 24A. Thus, if the airbag main body 2A is brought into the storage state, it can be deployed earlier.

  The present invention is not limited to the embodiments described above. For example, as long as the first chambers 21 and 21A and the second chambers 22 and 22A are partitioned according to the gas inflow direction, the partitioning means is not limited. For example, instead of stitches, a partition wall may be provided inside, or a valve that opens at a predetermined pressure may be provided.

  In each of the embodiments described above, the openings 23 and 23A are provided so as to reduce the impact input to the iliac bone and acetabulum, but the present invention is not limited to this. Corresponding to the iliac bone and the acetabulum, it is sufficient if the impact can be reduced. For example, the portions where the openings 23 and 23A are provided are not the openings 23 and 23A, but the cloths constituting the airbag main bodies 2 and 2A are formed so that the gas does not flow in by sewing the surroundings. May be.

  In each embodiment mentioned above, although the inflator 3 and 3A were provided in the upper part or lower part of the airbag main body 2 and 2A, it is not limited to this. For example, you may be provided in the center part of the airbag main bodies 2 and 2A.

  In each embodiment mentioned above, although the 1st chambers 21 and 21A are formed with the same width as inflator connection parts 24 and 24A, it is not limited to this. Although it may be provided with a width different from that of the inflator connecting portions 24 and 24A, it is preferably provided with the same width as in this embodiment so as not to disturb the gas flow.

  In each of the embodiments described above, the airbag main body 2 or 2A is folded as a wrap around which the end is wound inward, but the present invention is not limited to this. For example, a bellows fold (accordion fold) can be used. Moreover, you may combine winding folding and bellows folding.

  In the embodiment described above, the outer shape of the airbag body 2 or 2A is rectangular, but is not limited to this. Different shapes may be used as long as they extend in the first direction X and the second direction Y. Similarly, the shape of the openings 23 and 23A is not limited to an elliptical shape, and the shape is not limited as long as it corresponds to the iliac bone and the acetabulum.

  In each of the above-described embodiments, the flow path regulating stitches 33 and 33A are provided so as to be parallel to the side walls of the airbag main bodies 2 and 2A, but are not limited thereto. For example, the gas flow path 34 formed by the flow path restriction stitches 33 and 33A may be configured to gradually narrow from the upstream side (first chamber side) toward the downstream side. By being configured in this manner, the gas flow is along the second direction, and the gas flow rate is increased, so that the gas flow can be developed earlier.

  Moreover, although the number of chambers constituting the airbag body is two in each of the above-described embodiments, the present invention is not limited to this. You may divide | segment according to the site | part which wants to protect, and may have three or more chambers.

  The side airbag device of the present invention can reduce the impact input to the iliac bone and acetabulum. Therefore, it can be used in the automobile manufacturing industry.

DESCRIPTION OF SYMBOLS 1 Side airbag apparatus 2 Air bag main body 3 Inflator 4 Seat 5 Seat back 6 Door 21 1st chamber 22 2nd chamber 23 Opening 24 Inflator connection part 31 1st stitch 32 2nd stitch 33 Flow path control stitch 61 Door trim

Claims (4)

A side comprising an airbag main body and gas introducing means for introducing gas into the airbag main body, and inflating and deploying the airbag main body stored in a storage portion between a vehicle door and an occupant by introducing the gas An airbag device,
The airbag body is deployed at a position corresponding to at least the thigh and buttocks of the occupant seated by introducing the gas from the gas introduction means;
A second chamber developed above the first chamber by introducing gas from the first chamber;
A low expansion part formed at a position corresponding to the iliac bone and the acetabulum and having a lower expansion rate than the first chamber and the second chamber ;
The side airbag device according to claim 1, wherein the low expansion portion is provided between the first chamber and the second chamber . The side airbag device according to claim 1 , wherein the low expansion portion is an opening penetrating in a width direction of the vehicle . 3. The side airbag device according to claim 1 , wherein at least a part of the first chamber and the second chamber is partitioned by a conducting portion that conducts when a predetermined pressure is applied. The second chamber is provided with a flow path regulating member such that a gas flow path facing the conduction portion is formed along the side wall of the airbag body .
The side airbag device according to claim 3, wherein an outer periphery of the low expansion portion on the vehicle rear side is along the flow path regulating member .