JP2011189885A - Airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a state in which an exhaust port is suitably opened in an airbag of a side airbag device developed to the side of an occupant on the seat of an automobile. <P>SOLUTION: The airbag 11 is constituted by overlapping a first base fabric part 21 and a second base fabric part 22 and stitching the vicinity of a peripheral edge part 24 at a connecting line 26. In such a state that an excess length part 42 provided on the first base fabric part 21 slackens, the shape is maintained by the connecting line 26 to be made a chimney shape having the exhaust port 41 opened to the tip end part. Even when the inner pressure in the air chamber 31 of the airbag 11 is high, the tension is not applied to the excess length part 42 constituting an edge part of the exhaust port 41, therefore an opening area of the exhaust port 41 is secured and smooth exhaust can be secured. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an airbag that is deployed to the side of an occupant seated in a car seat, for example.

  2. Description of the Related Art Conventionally, for example, a so-called side airbag that is folded and stored in a side portion of an automobile seat and inflates and deploys to the side of an occupant seated on the seat at the time of a side collision is known.

  The airbag has a bag shape to which gas is supplied from an inflator, and an exhaust port that allows gas to be exhausted.

  And about such an exhaust port, about the airbag which made the bag shape by sewing the peripheral parts of a some base fabric, the structure which provides the part which is not sewn in a part of peripheral part and makes it an exhaust port is known. (See, for example, Patent Document 1). In this structure, the terminal of the sewing part is folded and reinforced, or a notch part that is not sewn is provided in a part of the base fabric.

Japanese Patent Laid-Open No. 9-11845 (Page 2, Fig. 1-3)

  In the configuration in which a portion that is not sewn is provided at a part of the peripheral portion of the airbag base fabric as the exhaust port as in the conventional case, the airbag does not sew with the sewn portion when the airbag is inflated and deployed. Due to the difference in tension applied to the portion, the exhaust port tends to be closed, and the adjustment of the opening area of the exhaust port is not always easy.

  This invention is made in view of such a point, and it aims at providing the airbag provided with the exhaust port which can hold | maintain the state opened appropriately.

  The airbag according to claim 1 is an airbag in which a plurality of panel portions are joined by a joining line along a peripheral portion, and an air chamber into which gas is introduced is provided inside, and is not joined by the joining line. The air chamber communicates with the outside, and has an exhaust port in which the length along the peripheral edge of the one panel portion is set larger than the length along the peripheral edge of the other panel portion. .

  The airbag according to claim 2 is the airbag according to claim 1, wherein one panel portion is provided with a surplus portion that is longer along the peripheral edge than the other panel portion. The one panel portion and the other panel portion are joined by a joining line along the peripheral edge except for the surplus length portion, and an exhaust port is provided at the end of the surplus length portion. It is what was done.

  The airbag according to claim 3 is the airbag according to claim 1, wherein the other panel portion is formed with a reduced-size portion whose length along the peripheral edge portion is smaller than that of the one panel portion. The one panel part facing the part is loosened, and the one panel part and the other panel part are joined by a joining line along a peripheral edge except for the loosened part, and the contraction An exhaust port facing the size portion is provided.

  According to the airbag of claim 1, when gas is introduced into the air chamber, the portions that are not joined by the joining line between one panel portion and the other panel portion are inflated and deployed so as to be separated from each other, One of the panel portions is deployed opposite to the object to be protected to protect the object to be protected. The gas in the air chamber is exhausted from the exhaust port. Even when gas is introduced into the air chamber and the airbag is inflated and deployed, an exhaust port in which the length along the peripheral edge of one panel is set larger than the length along the peripheral edge of the other panel is provided. Since it was provided, the tension | tensile_strength which tends to close an exhaust port is not added to the part which length was set large along the peripheral part of one panel part, and the state which opened the exhaust port appropriately can be hold | maintained. Since the exhaust port can be arranged in a desired direction of the peripheral portion, the gas can be exhausted in a direction in which the influence on the protected object can be suppressed without being blocked by the surrounding members.

  According to the airbag according to claim 2, in a state where the extra length of one panel portion is loosened, by joining one panel portion and the other panel portion with a joining line along the peripheral edge, An exhaust port can be easily formed at the end of the extra length. The manufacturing process is simple and the manufacturing cost can be reduced.

  According to the airbag of the third aspect, in a state where the reduced size portion is formed in the other panel portion, the one panel portion and the other panel portion are joined by the joining line along the peripheral portion, thereby reducing the size of the airbag. An exhaust port can be formed facing the dimension. One panel portion and the other panel portion formed in the same shape can be used, and the manufacturing cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of an airbag according to the present invention, in which (a) is an exploded perspective view showing a manufacturing process, and (b) is a partial perspective view. It is a side view of the state which an airbag same as the above developed. It is a bottom view of the state which the airbag same as the above developed. It is a top view of the state which expanded the 1st panel part of the airbag same as the above on the plane. It is a partial perspective view which shows other embodiment of the airbag of this invention.

  Hereinafter, an embodiment of an airbag according to the present invention will be described with reference to the drawings.

  In FIG. 2, reference numeral 1 denotes an airbag device. The airbag device 1 is attached to a seat (seat) that is a member to be attached in the interior of an automobile that is a vehicle, and faces an occupant that is a protected object seated on the seat. A so-called side airbag device is constructed that inflates and deploys the airbag 11 between the interior walls such as doors that are objects to protect the occupant. Hereinafter, directions such as front and rear, both sides, and up and down will be described with reference to the straight direction of the automobile.

  The airbag device 1 includes a bag-like airbag 11 that is inflated and deployed when supplied with gas, an inflator 12 that supplies gas to the airbag 11, and the airbag 11 and the inflator 12 are fixed to a seat. It is equipped with a fixture 14, which is a mounting member, and a resin case body (not shown), which is a cover for storing these members, and is housed in a stowed position provided on the side of the back of the seat and fixed to the seat frame Has been. The airbag device 1 includes a control device (not shown) provided in the vehicle, and the inflator 12 is controlled by the control device.

  The inflator 12 includes a substantially cylindrical main body, and when activated by the control means, inflate gas from one end of the main body.

  The fixture 14 is also called a retainer, and includes a retainer main body portion 16 that holds the inflator 12 and a pair of bolts 17 fixed to the retainer main body portion 16.

  The airbag 11 is constructed by stitching a base fabric called one or a plurality of panels or a main panel. In the present embodiment, as shown in FIG. 1 to FIG. 4, as two inner and outer base fabrics, a first base fabric portion 21 as one panel portion and a second base portion as the other panel portion. The base fabric portion 22 is overlapped, and the outer peripheral portions of the first base fabric portion 21 and the second base fabric portion 22, that is, the vicinity of the peripheral edge portion 24 are joined along the peripheral edge portion 24 by the joining line 26, An outer shell of a flat bag body is formed, each of which has a single continuous base fabric. And, the portion excluding the rear end portion of the outer shell becomes the airbag main body 30, and the inside of the airbag main body 30 becomes the air chamber 31 that is a bulging portion that is inflated and deployed by introducing gas. A base 32 is set at the rear end of the airbag main body 30, and the inside of the base 32 serves as a gas introduction part 33. Further, the joining line 26 is not formed at the rear end portion of the outer shell, and an opening for inserting the inflator 12 and the like is provided.

  Further, the airbag 11 is provided with attachment holes 36, 37, 38, 39 in the base 32 portion, which are vertically paired and arranged in four front and rear positions. Of these mounting holes 36, 37, 38, 39, the two pairs of mounting holes 36, 37 on the front side are formed through the first base cloth portion 21, and two pairs of mounting holes 38 on the rear side are formed. , 39 are formed through the first base fabric portion 21 and the second base fabric portion 22.

  The joining line 26 is a stitched line obtained by stitching the first base cloth part 21 and the second base cloth part 22 with a thread. The joining line 26 extends along the peripheral edge part 24 except for the opening part at the rear end of the base part 32. Are formed continuously.

  Further, the airbag 11 is formed with an exhaust port 41 that is an opening for communicating the air chamber 31 inside the airbag 1 to the outside. The exhaust port 41 is called an exhaust hole, an exhaust hole, or a vent hole, and faces the outer peripheral side from the peripheral edge 24 or the vicinity of the peripheral edge 24 of the airbag 11, and in this embodiment, the lower end of the airbag 11 It opens downward from the vicinity of the peripheral edge 24. Further, the exhaust port 41 is formed at the edge of the extra length portion 42. The extra length portion 42 can be called a bumpy portion, and is set in a triangular shape so that a part of the first base fabric portion 21 is picked up from the other portion. That is, the surplus length portion 42 is disposed so as to protrude from the surface of the other portion of the first base fabric portion 21 with the vertical direction as the longitudinal direction, and downward toward the lower end portion of the surplus length portion 42. An exhaust port 41 is formed. That is, the surplus length portion 42 is continuous with the edge portion of the exhaust port 41 and the other portion of the first base fabric portion 21, and the exhaust port 41 and the surplus length portion 42 are so-called chimney-shaped toward the lower side. It has become.

  Although not shown, a reinforcing cloth called a flameproof cloth or the like is overlapped and stitched inside the airbag 11 as necessary, and the width of the airbag 11 during deployment is regulated or a base cloth that guides gas is used. A partition wall is provided or partitioned by sewing.

  Next, the assembly process of this airbag apparatus will be described.

  First, the first base fabric portion 21 and the second base fabric portion 22 are cut out from the original fabric. At this time, the shapes of the first base fabric portion 21 and the second base fabric portion 22 are not the same, and the first base fabric portion 21 is larger than the second base fabric portion 22 by the extra length portion 42. It is formed. As shown in FIG. 4, the extra length portion 42 has a triangular shape that extends over almost the entire length of the first base fabric portion 21 in the up-down direction, with the mountain fold line 43 as the center and downward on both sides of the mountain fold line 43. It is partitioned by valley fold lines 44, 44 arranged symmetrically so as to expand toward the front. Further, a notch 46 is formed by notching a region surrounded by valley fold lines 44 and 44 in the vicinity of the peripheral edge 24, which is located on the tip side below the extra length portion 42 of the first base fabric portion 21. ing.

  And the 1st base fabric part 21 and the 2nd base fabric part 22 are piled up, the peripheral part 24 vicinity is sewn on the joining line 26, and the bag-like airbag 11 is comprised. At this time, as shown in FIG. 1 (a), the first base fabric portion 21 folds the mountain fold line 43, folds the valley fold lines 44, 44, and forms an edge 47 of the notch 46. , 47 are in a state of being adjacent to each other, the joining line 26 is arranged so as to cross the edge portions 47, 47 of the notch portion 46 at a position deviated from the extra length portion 42 to the peripheral edge portion 24 side, Fix it. In this state, as shown in FIG. 1 (b), the surplus length portion 42 has a chimney shape in which an exhaust port 41 is opened at the tip portion.

  Next, with the inflator 12 fixed to the retainer body 16, the inflator 12 and the fixture 14 are inserted into the airbag 11 from the opening at the rear end, and the bolt 17 is pulled out from the front mounting holes 36 and 37. . Next, the rear end portion of the airbag 11 is folded back, the bolts 17 are inserted into the rear mounting holes 38 and 39, and fixed with a nut or the like (not shown).

  Then, the airbag 11 combined with the inflator 12 and the fixture 14 in this way is folded into a predetermined shape, and further, the airbag 11, the inflator 12 and the fixture 14 are accommodated in a case as necessary, and the airbag 11 A bag device 1 is configured.

  And this airbag apparatus 1 is accommodated in the accommodation position of the side part of a seat, and is attached to the seat of a motor vehicle by fixing each volt | bolt 17 of the fixing tool 14 to the flame | frame of a seat, etc. Furthermore, the inflator 12 of the airbag device 1 is connected to a control device provided on the vehicle side via a harness (not shown). The control device includes a CPU and is connected to one or a plurality of sensors, and sends an ignition signal for starting the inflator 12 at a predetermined timing according to the state of the occupant and the situation of the collision obtained by these sensors. .

  Therefore, when the vehicle receives an impact such as a side collision, based on a signal from the sensor, the control unit activates the inflator 12 and injects gas into the gas introduction part 33 inside the base part 32. This gas is introduced from the gas introduction part 33 into the air chamber 31 inside the airbag main body 30, and the airbag 11 is inflated and deployed so that the base cloth parts 21 and 22 are separated from each other. Then, the airbag 11 opens the cover, protrudes from the seat, and is inflated and deployed toward the front by this inflating and deploying pressure. The airbag 11 is inflated and flattened widely between the occupant and the interior wall, one of the base fabric portions 21 and 22 is deployed to face the occupant's waist and chest, and the other is opposed to the interior wall. Then, the passenger is restrained by restraining the passenger from coming into contact with the indoor wall and restraining the passenger.

  Further, when the occupant comes into contact with the airbag 11, the gas is exhausted from the exhaust port 41, and the impact is effectively absorbed. Here, the exhaust port 41 is provided at the distal end portion of the surplus length portion 42, and the surplus length portion 42 is slackened by the joining line 26 in a state where the edges 47 and 47 of the cutout portion 46 are adjacent to each other. Since the shape is maintained, the internal pressure of the air chamber 31 of the airbag 11 is high, and even when tension is applied to the base fabric portions 21 and 22, no tension is applied to the extra length portion 42, and the exhaust port 41 The opening area is secured, and smooth exhaust is secured.

  As described above, according to the present embodiment, the airbag 11 is provided with the air chamber 31 in which the plurality of base fabric portions 21 and 22 are joined by the joining line 26 along the peripheral edge portion 24 and gas is introduced therein. In the case where the internal pressure of the air chamber 31 of the airbag 11 is high and tension is applied to the base fabric portions 21 and 22 due to the exhaust hole structure that forms the exhaust port 41 at the tip of the extra length portion 42. The opening area of the exhaust port 41 can be ensured and smooth exhaust can be ensured. In other words, the surplus length portion 42 is not joined by the joining line 26, and the surplus length portion 42 provided in the first base fabric portion 21 is peripheral to the opposing portion of the second base fabric portion 22. Since the length along the portion 24 is set to be large, the tension of the peripheral edge portion 24 is received by the second base fabric portion 22 in the portion of the exhaust port 41, and the first base constituting the edge portion of the exhaust port 41. The excess length portion 42 of the fabric portion 21 is not subjected to tension that tends to close the exhaust port 41, so that the tension line and the terminal do not coincide with each other, and the exhaust port 41 does not depend on the pressure in the airbag 11. A properly opened state can be maintained.

  Further, the extra length portion 42 formed so as to be picked up can tend to maintain a closed state in a state where the gas pressure at the initial stage of deployment is small due to the arrangement of the folding line and the joining line 26. In the initial stage, the air bag 11 can be quickly deployed by effectively using the gas, and a favorable characteristic that the gas can be reliably exhausted when the gas pressure increases can be easily realized.

  Further, the exhaust port 41 can be arranged in a desired direction of the peripheral edge portion 24, and the direction of exhaust can be easily controlled in a preferred direction. That is, in the side airbag, the airbag 11 is deployed in a narrow space between the indoor wall and the occupant, and it is necessary to arrange the exhaust port 41 so as not to interfere with surrounding members such as the indoor wall during deployment. is there. In the present embodiment, the exhaust port 41 is directed downward from the peripheral edge 24. It is possible to easily realize a configuration in which the gas is exhausted in a direction in which the exhaust does not affect the occupant without being blocked by the member.

  Further, the first base fabric portion 21 and the second base fabric portion 21 are folded in a part of the first base fabric portion 21 so that the preset surplus length portion 42 is pinched and the surplus length portion 42 is loosened. By joining the base fabric part 22 with the joining line 26 along the peripheral edge part 24, the exhaust port 41 can be easily formed at the end of the extra length part 42, the manufacturing process is simple, and the manufacturing cost can be reduced.

  In addition, since an appropriate opening area of the exhaust port 41 can be secured and good exhaust characteristics can be secured, there is no need to excessively enlarge the exhaust port 41, and gas can be effectively used to reduce the size of the inflator 12. The development characteristics can be easily improved.

  In the above-described embodiment, one of the first base fabric portion 21 and the second base fabric portion 22 has a longer circumferential length than the other per portion of the exhaust port 41 that is a non-sewn portion. The first base fabric portion 21 is formed in advance larger than the second base fabric portion 22 by the extra length portion 42, but is not limited to this configuration. For example, the first base cloth part 21 and the second base cloth part 22 are formed in the same size, and one base cloth part, for example, the second base cloth part 22, is shown in FIG. By folding the portion and sewing to maintain the shape, the reduced-size portion 51 having a smaller dimension along the peripheral edge portion 24 than the first base fabric portion 21 can be formed. In this structure, the dimension along the peripheral part 24 of the position of the 1st base fabric part 21 which opposes this reduced size part 51 becomes comparatively long, and a 1st base fabric is in the state which slackened this part. The joining line 26 along the peripheral edge portion 24 except the position where the first base fabric portion 21 which is the reduced size portion 51, that is, the reduced size portion 51 is loosened, between the portion 21 and the second base fabric portion 22. By joining together, it is possible to form the exhaust port 41 that faces the reduced-size portion 51 and has the same function as the configuration shown in FIG.

  And in the structure which forms the reduced size part 51 in this way, the two base fabric parts formed in the same shape can be used, and manufacturing cost can be reduced by simplification of a structure.

  Further, in each of the embodiments described above, the joining line 26 on the outer peripheral portion is formed by sewing using a thread, but is not limited to this configuration, and can be joined using, for example, an adhesive.

  Further, the exhaust port 41 can be directed in another direction such as forward, in addition to opening downward.

  In each of the above embodiments, the outer shell of the airbag 11 is configured by using two separate base cloth portions 21 and 22 as the panel portion. However, the outer shell is not limited to this configuration. The base fabric may be folded back, or the outer shell may be configured using three or more separate base fabrics.

  The airbag 11 is not limited to the one used for the side airbag device, but is used for the driver airbag device provided in the steering wheel and the passenger seat passenger airbag device provided in the instrument panel. It can also be applied to bags.

  The present invention is used, for example, as a so-called side airbag that is housed in a side part of a seat of an automobile and is deployed between an occupant and a door to protect the occupant.

11 Airbag
21 First base fabric part as one panel part
22 Second base fabric part as the other panel part
24 Perimeter
26 Joining line
31 Air chamber
41 Exhaust vent
42 Extra length
51 Reduced section

Claims (3)

It is an airbag in which a plurality of panel portions are joined by a joining line along a peripheral portion, and an air chamber is provided in which gas is introduced.
Exhaust air that is not joined by the joining line and communicates to the outside, and the length of the one panel part along the peripheral part is set larger than the length of the other panel part along the peripheral part. An airbag characterized by having a mouth. One panel portion is provided with a surplus portion that is longer along the peripheral edge than the other panel portion, and the one panel is in a state in which the surplus portion is slackened and the surplus portion is excluded. The airbag according to claim 1, wherein the portion and the other panel portion are joined together by a joining line along a peripheral portion, and an exhaust port is provided at an end of the extra length portion. The other panel portion is formed with a reduced size portion whose length along the peripheral edge portion is smaller than that of the one panel portion, and the one panel portion facing the reduced size portion is in a loosened state, and this The one panel part and the other panel part except for the loosened part are joined by a joining line along a peripheral part, and an exhaust port facing the reduced-size part is provided. The described airbag.

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