a) and 1(b) are schematic side views illustrating an automobile seat provided with a side airbag apparatus of an embodiment according to the present invention.
a) and 4(b) are perspective views illustrating an entire structure of a heat cloth.
a) to 5(f) are views explaining the way how to fold the side airbag when the same is housed in a casing.
Hereinbelow, embodiments of the present invention will be explained with reference to the drawings.
a) and 1(b) are schematic side views illustrating an automobile seat provided with the side airbag apparatus of an embodiment according to the present invention.
In
The seat 10 is provided with a side airbag apparatus 14 in the seat back portion 10B for limiting a movement of an upper body of the occupant 12 in the event of side collision, rollover or the like. The side airbag apparatus 14 is provided with a side airbag 16 inflating and deploying in a space between a side wall portion of the automobile body (not shown, positioned at a front side of the paper surface in
As shown in
The side airbag 16 is formed of a first bag portion 16A positioned upside, and a second bag portion 16B positioned downside. The first bag portion 16A protects a chest portion of the occupant 12 and absorbs an impact, and the second bag portion 16B limits a movement of a waist portion of the occupant 12 in the lateral direction of the vehicle.
In
An inside of the side airbag 16 is partitioned into two chambers including a first chamber 28A formed from an upside to a tip end side in an inflating direction (right side in
The chamber connecting portion 28C is formed between a circular stitching portion 24b having approximately a circular shape, provided at a tip end portion of the stitching-and-joining portion 24a, and a circular stitching portion 24c having approximately a circular shape, provided at the base end side of the side airbag 16 (left side in
Therefore, it is set in such a way that an inner diameter L1 of the fitting portion 70 is approximately equal to an outer diameter L2 of the sleeve 40 (refer to the partially enlarged view in
Further, by providing a circular stitching portion at both sides (or one side may be applicable) of the fitting portion 70 as in the present embodiment, a construction can be formed to have an inner diameter of the circular stitching portion at the top portion to be approximately identical to the outer diameter of the sleeve 40. Therefore, the friction when inserted can be reduced, and an attaching property of the sleeve 40 to the fitting portion can be improved in comparison to a case where a fitting portion is formed in such a way that both sides thereof are stitched into a straight line shape, the inner diameter thereof is approximately identical to the outer diameter of the sleeve 40, and the sleeve 40 is inserted into the fitting portion.
The sleeve 40 inserted into the aforementioned fitting portion 70 is provided on the side of a convex portion 20a that discharges the gas of the inflator 20. The sleeve 40 is provided with a flowing amount distributing function for distributing the gas blown out from the convex portion 20a into the first and second chambers 28A and 28B at a predetermined flowing amount ratio (described later in detail).
In the stitching-and-joining portion 24, at a portion constituting an outer edge of the second chamber 28B (namely, a portion starting from a base end side of the chamber connecting portion 28C of the inflating direction to a tip end of the stitching-and-joining portion 24a which extends toward an inner periphery side, while running to the downside of the side airbag 16), a sealing member portion 30 formed from an appropriate sealing material such as silicone rubber or the like is provided along the stitching-and-joining portion 24 so as to seal the stitching-and-joining portion 24. The sealing member portion 30 is provided to be wider than the reduplicated stitching-and-joining portions 24 so that both the stitching-and-joining portions 24 provided in the reduplicated manner can be sealed (refer to the partially enlarged view in
The side airbag 16 (in detail, the first bag 16A) is provided with a concave portion 34 having approximately arc shape at a position corresponding to an elbow portion 12a of the occupant 12 (refer to
Incidentally, in the first panel 22A, a slit (passing-through hole) 72 is provided for inserting the inflator 20 and the sleeve 40 into the side airbag 16. In addition, a cover member (first cover member) 36 for covering the slit 72 from one side (downside in
In
In the tongue piece portion 40b of the sleeve 40, a hole 48 is provided for the bolt 44 of the clip 46 to be inserted. By the bolt 44 being inserted into the hole 48, the sleeve 40 is hooked in a condition of covering one side (left side in
Further, an opening 52 is provided in the squeezing portion 40a of the sleeve 40. A bore diameter of the opening 52 is set to a previously calculated appropriate value so as for the blown out gas of the inflator 20 to be distributed to the first chamber 28A of the first bag portion 16A and the second chamber 28B of the second bag 16B at an appropriate flowing amount ratio. This is for the first bag portion 16A and the second bag portion 16B constituting the side airbag 16 to perform a desired deploying behavior, or for the pressures in the first bag portion 16A and the second bag portion 16B to become desired values, respectively. Therefore, the gas blown out from the inflator 20 is controlled to a predetermined flowing amount that is previously set, and supplied to the second chamber 28B side. (The flow path is indicated by an arrow 54 in
The sleeve 40 having the aforementioned construction is attached to the chamber connecting portion 28C in a condition of being covered with the heat cloth 56.
In
As shown in
b) illustrates a condition after the inflation and deployment of the side airbag 16 is complete. In general, the pressure of a portion for limiting the waist portion is set to be greater than that of a portion of the chest portion in a side airbag having a plurality of portions for respectively restraining a chest portion and a waist portion of an occupant as in the present embodiment in light of improvement of safety. Accordingly, it is preferable to prevent the gas from blowing back to the chest portion side from the waist portion side after completing the inflation and deployment of the airbag. In the present embodiment, when the gas is about to blow back from the second chamber 28B side to the first chamber 28A side via the chamber connecting portion 28C after the inflation and deployment of the side airbag 16 are completed, the opening 52 of the sleeve 40 is obstructed by that the heat cloth 56 is folded, as shown in
a) to 5(f) are views explaining the way how to fold back the side airbag 16 when being housed in the casing 18, described earlier. Incidentally, a condition of the side airbag 16 looking from the second panel 22B side is shown here.
Firstly, the so-called “inward folding” is performed in which the above-described bag outer edge portion 32 at a tip end side of the inflating direction (downside in
Then, the so-called “roll-folding” is performed in which the side airbag 16 is folded while being rolled up into a roll shape from the tip end side (downside in
Next, as for the rest part of the base end side of the side airbag 16 in the inflating direction (upside in
As shown in
In the automobile where the side airbag apparatus 14 having the construction described above is mounted, various types of sensors are provided for detecting the occurrence (or prediction for the occurrence) of the collision (including the side collision or the like) of the automobile or the rollover thereof, when the same occurs. Moreover, in an emergency of the side collision or the like, these sensors detect the emergency, and an inflator control circuit starts an initiator of an inflator 12 based on a detecting signal from these sensors. Therefore, the inflator 20 is started, and the gas for inflating the airbag is blown out. The side airbag 16 is inflated and deployed in a space between the side wall portion of the automobile body and the occupant 12.
According to the side airbag apparatus 14 of the present embodiment having a construction and performing an operation explained above, a below mentioned advantage is obtained.
That is, in the present embodiment, the side airbag 16 is provided with the accordion-like folded portion 64, which is folded in the accordion-like shape when being housed, at the base end side in the inflating direction, and is provided with the roll-shaped folded portion 66, which is folded in the roll-shape when being housed, at the tip end side in the inflating direction. Therefore, a deploying speed of the side airbag 16 can be increased since the side airbag 16 is folded into the accordion-like shape at the base end side in the inflating direction where an obstacle such as an arm or the like of the occupant 12 does not exist. In addition, it is hardly affected by the obstacle such as the arm or the like of the occupant 12 since the side airbag 16 is folded into the roll shape at the tip end side in the inflating direction where there is a possibility that the obstacle can exists. Thus, since both improvements of the deploying speed and suppression for the influence of the obstacle can be achieved, a deploying property of the side airbag 16 can be improved. Further, by providing the side airbag 16 with the accordion-like folded portion 64 and the roll-shaped folded portion 66, the side airbag 16 can be folded into a fully compact size when being housed in the casing 18. Accordingly, a housing property can be improved.
Furthermore, the present embodiment is specifically constructed such that the inward folding can be performed for the bag outer edge portion 32 at the tip end side in the inflating direction, and that the inward-folded portion 68 is provided at the tip end side in the inflating direction. Therefore, the roll-shaped folding operation at the tip end side in the inflating direction can be performed in a condition where the bag outer edge portion 32 at the tip end side in the inflating direction is formed to be approximately flat shape. Accordingly, a folding property of the side airbag 16 can be improved. As a result, the side airbag 16 can be designed to be even more compact size when being housed.
In addition, since the gas-flow path in the inward-folded portion 68 is not narrowed by the folding operation in general, a resistance is small. Further, the inward-folded portion 68 has a property in which the deploying speed during inflation and deployment is high. Therefore, the airbag can be designed to be even more compact size when being housed, while keeping a favorable deploying speed by performing the accordion-like folding and the roll-folding upon forming the bag outer edge portion 32 into the inward folding as in the present embodiment.
Furthermore, the present embodiment is specifically constructed such that the base end side in the inflating direction of the side airbag 16 is folded into the accordion-like shape, and the tip end side in the inflating direction thereof is folded into the roll shape. Therefore, the side airbag 16 is folded into approximately rod-shape. Thereafter, an end portion of the rod-shaped side airbag 16 is folded toward one side, and the folded portion is further folded toward the other side. Therefore, a double folded portion 80 is formed. Therefore, a size in a length direction of the side airbag 16 being folded into approximately rod-shape can be reduced. Therefore, the side airbag 16 when being housed can be further made small. The portion folded toward one side is further folded toward the other side. Therefore, the resistance of the side airbag 16 when being inflated and deployed can be reduced in comparison to a case where the side airbag 16 is continuously folded toward one side (or the other side). Accordingly, while keeping a favorable deploying property, the airbag can be designed to be further compact size when being housed as mentioned above.
Furthermore, the present embodiment is specifically constructed such that an inside of the side airbag 16 is partitioned into the first chamber 28A and the second chamber 28B. Further, the present embodiment is constructed such that the side airbag 16 is provided with the first bag portion 16A having the first chamber 28A for protecting the chest portion of the occupant 12, and the second bag portion 16B having the second chamber 28B for limiting the movement of the waist portion of the occupant 12. Therefore, in the side collision, the rollover or the like of the motor vehicle, the impact can be absorbed by receiving the chest portion of the occupant 12 by means of the first bag portion 16A, and the movement of the waist portion of the occupant 12 in the side direction of the vehicle body can be limited by means of the second bag portion 16B. This results in improved safety.
Moreover, the present embodiment is specifically constructed such that the first bag portion 16A and the second bag portion 16B are connected at the base end side in the inflating direction. Therefore, a flip-flopping of the airbag in inflation and deployment can be suppressed in comparison to the airbag having a construction, in which, for example, a plurality of bag portions is separated.
Further, the present embodiment is specifically constructed such that the slit 72 for inserting the inflator 20 that supplies the gas for inflation and deployment, into the inside of the bag is provided in the first panel 22A, and that the cover member 36 for covering the slit 72 from outside the bag, which is disposed at a lower side of the slit 72, and a cover member 38 for covering the slit 72 from outside the bag, which is disposed at an upper side of the slit 72 are provided in the first panel 22A. Therefore, the slit 72 is covered with the cover member 36, which is disposed at the lower side of the slit 72, from the downside, and the slit 72 is covered with the cover member 38, which is disposed at the upper side of the slit 72, from the upside, after the inflator 20 is inserted into the side airbag 16 via the slit 72. Thus, since the slit 72 is covered with two of the cover members 36 and 38 from both sides, a favorable airtightness of the side air bag 16 can be achieved.
Incidentally, in the above-described embodiments, although the side airbag, in which the inside of the airbag is constructed with two bag portions by being partitioned into two chambers, is explained above as an example, the present invention is not limited to the above-described embodiment. That is, for example, the present invention may be applied to a side airbag constructed as a single bag, in which an inside of the bag is not partitioned, or a side airbag constructed with three or more bag portions, in which an inside of the airbag is partitioned into three or more chambers.
Further, in the above-described embodiment, as mentioned above, although the side airbag 16 is constructed by stitching and joining the first panel 22A and the second panel 22B, the present invention is not limited to the above described embodiment. For example, the side airbag 16 may be constructed by other joining device such as, hollow weave or the like other than joining the first panel 22A and the second panel 22B.
Furthermore, in the above-described embodiment, although the present invention is illustrated by applying the invention to a so-called seat-mount type side airbag apparatus that is mounted in the seat back 10B of the seat 10, the present invention is not limited to the above-described embodiment. For example, the present invention may be applied to, for example, a so-called door-mount type side airbag apparatus that is mounted on an automobile door.
The disclosure of Japanese Patent Application No. 2006-161745 filed on Jun. 12, 2006 is incorporated as a reference.
While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative, and the invention is limited only by the appended claims.
Number | Date | Country | Kind |
---|---|---|---|
2006-161745 | Jun 2006 | JP | national |