JP2013010415A - Airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag that more stably and promptly develops toward the occupant.SOLUTION: A both sides part 23a of a diffuser 23 opposed to a gas inlet 31 is connected to a lower corner part 36 where both sides of a lower surface part 25 that has the gas inlet 31 of airbag body 22 is consecutive with a both sides face part 26. The diffuser 23 can be opened following the expansion of the airbag body 22. The airbag 13 that develops more stably and promptly toward the occupant can be provided by leading the inflation gas G to the occupant side, and the anti-occupant side that is the direction intersecting to the aperture direction by the diffuser 23 at the gas inlet 31.

Description

  The present invention relates to an airbag that is inflated and deployed by introducing inflation gas.

  2. Description of the Related Art Conventionally, for example, an airbag device for a passenger in a passenger seat provided in an instrument panel portion of an automobile is known. The airbag device includes an inflator that supplies inflation gas and a bag-like airbag that is folded into a predetermined shape. In the event of a car collision, etc., an inflation gas is supplied from the inflator, the airbag is inflated and deployed in front of the occupant, which is a protected object located in the passenger seat, and the occupant is restrained to mitigate the impact. It is like that.

  In the case of such an airbag device, the inflation gas introduced from the inflator into the airbag via the gas inlet port flows along the normal direction with respect to the instrument panel portion, and then inflates the airbag. While spreading. Therefore, the airbag expands so as to jump out in the normal direction of the instrument panel, that is, upwards, and comes into contact with the windshield, which is a windshield. Preparation of desired development characteristics is not easy.

  In this regard, a configuration is known in which a belt-shaped diffuser that is a rectifying member is disposed inside a bag-shaped airbag main body portion that constitutes an airbag. In this configuration, the mount for attaching the inflator to the instrument panel part and both sides of the diffuser are integrally sewn, and the diffuser guides the inflation gas to the front-rear direction, that is, the occupant side and the non-occupant side (for example, (See Patent Documents 1 and 2.)

  However, in this configuration, since the diffuser is inflated and deployed once inside the airbag body separately from the airbag body, it is not easy to stabilize the shape of the diffuser in this deployed state, and the gas inlet port From the above, it is not easy to effectively guide the inflation gas introduced into the airbag body and smoothly deploy the airbag to the occupant side.

JP-A-11-170955 (page 7-9, FIG. 2) JP 2009-61867 A (Page 5-10, FIG. 1)

  As described above, for example, in an airbag device for a passenger on the passenger seat, it is desired to deploy the airbag more stably and quickly toward the passenger.

  This invention is made | formed in view of such a point, and it aims at providing the airbag which expands more stably and rapidly toward a to-be-protected object.

  The airbag according to claim 1 is an airbag that is folded and stored and is inflated and deployed by introduction of inflation gas, and has a main surface portion having a gas introduction port into which inflation gas is introduced, and at least both sides of the principal surface portion. A bag-like airbag main body portion having a side surface portion extending along a direction intersecting with the main surface portion in a deployed state continuously through the corner portion, and both side portions are joined to the corner portion and the gas inlet port And a rectifying member that guides the expanded gas to the protected object side and the anti-protected object side, which are the directions intersecting the opening direction of the gas inlet.

  According to a second aspect of the present invention, in the airbag according to the first aspect, the rectifying member is provided in line symmetry in both side directions.

  The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein the rectifying member is provided by joining a plurality of rectifying member base fabrics in both directions.

  According to a fourth aspect of the present invention, in the airbag according to any one of the first to third aspects, the airbag main body portion is composed of base fabrics having different main surface portions and both side surface portions, and corner portions of these base fabrics. It is provided by sewing, and both side portions of the rectifying member are sewn together with the corner portions and are integrally joined to the corner portions.

  According to a fifth aspect of the present invention, in the airbag according to any one of the first to fourth aspects, the airbag main body has vent holes that are located on both side surfaces and permit the exhaust of the inflated gas introduced from the gas inlet. The rectifying member is provided with openings on both sides that face the vent holes when deployed.

  According to the airbag according to claim 1, both sides of the rectifying member facing the gas inlet are joined to corners where both sides and both sides of the main surface having the gas inlet of the airbag main body are continuous. Thus, the rectifying member can be opened following the deployment of the airbag main body, and therefore the protected object side and the anti-protected object side which are directions intersecting the opening direction of the gas inlet by the rectifying member. By leading the inflation gas to the air bag, it is possible to provide an airbag that is more stably and rapidly deployed toward the object to be protected.

  According to the airbag of the second aspect, in addition to the effect of the airbag of the first aspect, the straightening of the flow straightening member in both directions suppresses the folding of the flow straightening member in the folded state, and the deployment. Sometimes the rectifying member can function more stably.

  According to the airbag according to claim 3, in addition to the effect of the airbag according to claim 1 or 2, by providing a rectifying member by joining a plurality of rectifying member base fabrics in both directions, It is possible to suppress the elongation deformation of the rectifying member and to function the rectifying member more stably at the time of deployment.

  According to the airbag according to claim 4, in addition to the effect of the airbag according to any one of claims 1 to 3, the airbag is provided by sewing different base fabrics constituting the main surface portion and both side surface portions of the airbag main body portion. By sewing the both sides of the rectifying member together with the corners to be joined and integrally joining to these corners, the productivity is higher than when both sides of the rectifying member are joined separately to the corners of the airbag main body. Will improve.

  According to the airbag of the fifth aspect, in addition to the effect of the airbag according to any one of the first to fourth aspects, the opening facing the vent hole provided on both side surfaces of the airbag main body in a deployed state is rectified. By providing in the member, the surplus of the expansion gas introduced from the gas inlet can be reliably discharged through the opening and the vent hole.

It is explanatory side view which shows the expansion | deployment state of 1st Embodiment of the airbag of this invention. It is explanatory front view which shows the expansion | deployment state of an airbag same as the above. It is a perspective view which shows the expansion | deployment state of an airbag same as the above. It is a top view which shows typically the rectification | straightening member of 2nd Embodiment of the airbag of this invention. It is explanatory front view which shows the expansion | deployment state of an airbag same as the above.

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

  1 to 3, reference numeral 10 denotes an airbag device. The airbag device 10 is an instrument as an installation portion positioned in front of a passenger seat of an automobile as a vehicle, that is, a passenger in a passenger seat as a protected object. The airbag device 10 is disposed inside the passenger panel portion 11 and is used for a passenger on the passenger seat. Hereinafter, the front-rear direction, the both-side direction, and the up-down direction will be described based on the straight-ahead direction of the automobile with the airbag device 10 attached to the automobile.

  The instrument panel unit 11 is formed in a curved surface or the like that slightly lowers toward the rear side, that is, the passenger seat side, and is attached to a steering member (not shown) as a mounted member that is disposed inside the instrument panel unit 11. The bag device 10 is fixed by screwing or the like with the front side inclined slightly from the upper side toward the rear side, that is, the passenger side. In addition, a windshield 12 that is a windshield (W / S) inclined by, for example, about 30 ° from the front lower side toward the upper rear side is disposed above the instrument panel portion 11.

  The airbag device 10 can also be called an airbag module, and includes an airbag 13, an inflator 14 that supplies inflation gas G to the airbag 13, a case body 15 to which the airbag 13 and the inflator 14 are attached. A retainer (not shown), a cover body (not shown) that covers the airbag 13 before deployment, a control means (not shown) that controls the operation of the inflator 14, and the like. Further, the airbag device 10 is configured to be attached to an instrument panel unit 11 of an automobile and electrically connected to a control device including a sensor and the like.

  The case body 15 is formed in a substantially box shape, the front side or the upper side toward the windshield 12 is a rectangular projecting opening 17 that is an opening, and the inside is an airbag storage portion 18 that stores a folded airbag 13 Has been. A mounting hole (not shown) for mounting the inflator 14 is formed at the bottom of the case body 15. And this protrusion 17 is normally covered with the cover body.

  The inflator 14 includes a disk-shaped main body portion 14a, and a square plate-like flange portion 14b is projected from a lower position in the height direction of the main body portion 14a, and the four corners of the flange portion 14b are projected. A through hole is formed in. A plurality of gas injection ports (not shown) are formed on the outer peripheral surface of the main body portion 14a, which is located above the main body portion 14a, that is, above the flange portion 14b. The igniter and the medicine are accommodated inside the main body part 14a, and the igniter burns the medicine and expands from the gas injection port by an electrical signal from the control means transmitted through the connector connected to the bottom. The gas G is supplied rapidly. The inflator 14 is attached to the bottom of the case body 15 in a state where the main body portion 14a provided with a gas injection port is inserted inside the airbag 13. The inflator 14 has various shapes, and for example, a configuration in which a columnar main body is disposed inside the airbag 13 can be employed.

  Further, the retainer is formed in a frame shape, and a mounting bolt (not shown) for mounting the inflator 14 together with the airbag 13 is projected.

  The cover body is formed of resin so as to be integrated with or separate from the instrument panel portion 11, and a tear line that is thinner than other portions and easily breaks is formed in a substantially H-shaped plane.

  The airbag 13 includes an airbag main body 22 formed in a bag shape by combining one or a plurality of base fabrics 21, and a diffuser 23 that is a rectifying member disposed inside the airbag main body 22. I have. The airbag 13 can be arbitrarily folded when stored in the airbag storage portion 18, but for example, by folding the diffuser 23 and the airbag main body portion 22 so as to form a layer, It can be deployed smoothly.

  The airbag main body 22 is also called a main panel or a main bag, and is one main surface portion that extends in the front-rear direction, the left-right direction, and the up-down direction along the upper surface of the instrument panel portion 11 in the deployed state. A lower surface portion 25 that is a surface portion, a direction that is continuous on both sides of the lower surface portion 25 and separated from the instrument panel portion 11, that is, between the side surface portions 26 and 26 rising to the passenger side, and between these side surface portions 26 and 26 An upper surface portion 27 which is the other main surface portion as an anti-main surface portion that continuously extends in the front-rear direction, the left-right direction, and the up-down direction is integrally provided, and is curved from the front upper side to the rear lower side in the unfolded state. The rear side of the upper surface portion 27 that faces the occupant is an occupant restraint surface 28 that serves as an object-facing surface that faces the occupant.

  The lower surface portion 25 is formed in a longitudinal shape in the front-rear direction by, for example, a first base fabric 21a, which is a single base fabric, and the inflation gas G is introduced at a position closer to the front side located on the instrument panel portion 11. The gas inlet 31 is provided. In addition, the lower surface portion 25 is integrally fixed to the airbag housing portion 18 of the case body 15 together with the inflator 14 at the peripheral edge portion of the gas introduction port 31.

  Further, the side surface portions 26 are formed in a longitudinal shape along both sides of the lower surface portion 25 by a second base fabric 21b which is a single base fabric different from the first base fabric 21a of the lower surface portion 25, for example. A circular vent hole 34 that allows the inflation gas G to be discharged is provided at an upper portion closer to the rear than the position facing the upper side of the introduction port 31 (inflator 14). These vent holes 34 appropriately set the internal pressure of the airbag body 22 by discharging excess inflation gas G in the deployed state of the airbag 13 (airbag body 22).

  Further, the upper surface portion 27 is formed in a longitudinal shape in the front-rear direction by a third base fabric 21c which is a single base fabric different from the first and second base fabrics 21a and 21b of the lower surface portion 25 and both side surface portions 26, for example. It is continuous so as to cover the upper part between the side surface parts 26 from the front part to the rear part.

  Further, the first base fabric 21a constituting the lower surface portion 25, the second base fabric 21b constituting the side surface portions 26, and the third base fabric 21c constituting the upper surface portion 27 are joined together by sewing, for example. It has become. And the sewing part (joint part) of the 1st base fabric 21a and each 2nd base fabric 21b is the lower corner | angular part 36 which is a corner | angular part as one corner | angular part where the lower surface part 25 and the both-sides surface part 26 continue. It has become. In addition, a sewing portion (joint portion) between each of the second base fabric 21b and the third base fabric 21c is an upper corner portion 37 as the other corner portion where both side surface portions 26 and the upper surface portion 27 are continuous.

  Each lower corner portion 36 and each upper corner portion 37 are also called a corner portion or an edge portion, respectively. Each lower corner portion 36 is positioned above the instrument panel portion 11 or on the instrument panel portion 11 in the deployed state of the airbag 13 (airbag main body portion 22). Is located almost directly above.

  The diffuser 23 guides the expansion gas G to the front-rear direction, ie, the occupant side and the anti-occupant side, which is a direction intersecting the up-down direction that is the opening direction of the gas introduction port 31. For example, A diffuser base cloth 41, which is a rectifying member base cloth, is formed in a longitudinal belt shape in the left-right direction, and both front and rear ends are open. For example, the diffuser 23 is formed so as to be gradually narrowed in both lateral directions from the rear side to the front side, and is symmetrical with respect to both sides, in other words, symmetrical with respect to the center line in both sides. ing. Further, at positions near the rear ends of both sides of the diffuser 23, for example, circular openings 42 slightly smaller than the vent holes 34 are provided so as to oppose (wrap) the vent holes 34 of the airbag body 22. These openings 42 are respectively formed and communicated with the vent holes 34, respectively. The entire diffuser 23 is sewn together with the lower corners 36 of the airbag main body 22 and integrally joined to the lower corners 36, that is, co-sewn. By co-sewing the both side portions 23a of the diffuser 23 and the lower corner portion 36 of the airbag main body portion 22, this co-sewn location, the diffuser base fabric 41, and the respective end sides of the first and second base fabrics 21a and 21b A band-shaped surplus portion (not shown) is formed between the two. The surplus portion may protrude outside the airbag main body 22. For example, after the first and second base fabrics 21 a and 21 b are turned over in advance and co-sewn with the diffuser base fabric 41, By turning the second base fabrics 21a and 21b upside down, they can be positioned inside the airbag main body 22. In this state, the diffuser 23 faces the upper side of the gas introduction port 31 (inflator 14) and covers the gas introduction port 31 (inflator 14). Therefore, in the deployed state, the diffuser 23 has a front end side located in front of the gas introduction port 31 (inflator 14) and a rear end side located behind the gas introduction port 31 (inflator 14) in a side view. . Note that the diffuser 23 may be in contact with or separated from the upper surface portion 27 of the airbag main body portion 22 in the deployed state, but is spaced downward in the present embodiment. The diffuser 23 guides the expansion gas G in the front-rear direction more effectively as the distance away from the upper surface portion 27 is larger, in other words, closer to the gas inlet 31 (inflator 14). Can do.

  Next, the deployment operation of the airbag device 10 will be described.

  The outline of the operation of the airbag device 10 is as follows. When the control device operates the inflator 14 and injects the inflation gas G from the inflator 14 in the event of a vehicle collision, the airbag device 10 is folded into the airbag storage portion 18. The accommodated airbag main body 22 is inflated and deployed as the inflation gas G flows from the gas introduction port 31 and breaks the tear line of the cover body to project from the projection port 17.

  At this time, the diffuser 23 in which both side portions 23a are integrally joined to each lower corner portion 36 of the airbag main body portion 22 is also deployed following the deployment of the airbag main body portion 22 so that the gas inlet 31 The expanding gas G injected from above toward the upper direction of the gas inlet 31 comes into contact with the lower surface of the diffuser 23 facing the upper side of the gas inlet 31 so as to curve the diffuser 23 in an arch shape. To stand up. That is, the diffuser 23 is opened not only on the rear side on the passenger side but also on the front side on the non-occupant side, so that it can be more reliably and quickly raised by the inflation gas G.

  Therefore, the airbag main body 22 is inflated and deployed directly toward the front of the passenger by the inflation gas G being guided in the front-rear direction by the diffuser 23 that rises, and the upper body of the passenger seated in the passenger seat The occupant restraint surface 28 is deployed in front of the occupant to restrain the occupant from the impact of the collision.

  As described above, according to the present embodiment, the gas inlet 31 is opposed to the lower corner portion 36 where both sides of the lower surface portion 25 having the gas inlet 31 of the airbag main body 22 and the side surfaces 26 are continuous. The diffuser 23 can be opened following the deployment of the airbag main body 22 by joining both side portions 23a of the diffuser 23 to be performed. Therefore, the diffuser 23 does not deploy separately from the deployment of the airbag main body 22 and the deployment direction thereof does not vary. The expansion gas G is guided to the occupant side and the counter occupant side that intersect the opening direction of the introduction port 31, so that the occupant restraint surface 28 is formed more stably and quickly toward the occupant. It is possible to provide the airbag 13 that can speed up the process. That is, with such a configuration, the inflation gas G introduced into the airbag main body 22 from the gas inlet 31 flows directly upward as it is, and protrudes upward so as not to face the occupant. Since the airbag main body 22 does not expand to the occupant side after colliding with the windshield 12, the airbag main body portion 22 (airbag 13) is directly inflated and deployed to the occupant side. The expansion and deployment of the vehicle is stable and quick, and the occupant restraint surface 28 can be surely and quickly opposed to the occupant, so that desired occupant restraint performance can be ensured. Therefore, even the airbag 13 (airbag body 22) having a relatively large capacity can be quickly deployed to the occupant side, and the formation of the occupant restraint surface 28 can be accelerated.

  Further, both side portions 23a of the diffuser 23 together with the lower corner portion 36 provided by sewing the first base fabric 21a and the second base fabric 21b that constitute the lower surface portion 25 and the both side surface portions 26 of the airbag main body portion 22 together. , And integrally joined to these lower corners 36, the productivity is higher than when both sides 23a of the diffuser 23 are joined separately to the lower corners 36 of the airbag body 22. improves.

  Furthermore, by making the diffuser 23 line symmetric in both directions, folding of the diffuser 23 in the folded state can be suppressed, and the diffuser 23 can function more stably during deployment.

  Then, by providing the diffuser 23 with an opening 42 that is opposed to the vent hole 34 provided on the both side surface portions 26 of the airbag main body portion 22 in the deployed state, the gas inlet 31 is connected via the opening 42 and the vent hole 34. The surplus of the introduced expanded gas G can be reliably discharged.

  Further, the deployment characteristics of the airbag 13 are not affected by the position and shape of the windshield 12, and versatility can be improved.

  Next, a second embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment shown in FIGS. 4 and 5, the diffuser 23 of the first embodiment is configured by a plurality of, for example, two diffuser base cloths 45 which are rectifying member base cloths. is there.

  Each diffuser base fabric 45 includes, for example, parallel sides 45a and 45b that are parallel to each other in a plan view, vertical sides 45c that are perpendicular to the parallel sides 45a and 45b, and parallel sides. It has a trapezoidal shape (a right-angled trapezoidal shape) having an inclined side part 45d which is an inclined side part with respect to the parts 45a and 45b. Each diffuser base fabric 45 has an opening 42 formed therein. Further, these diffuser base fabrics 45 are formed in a congruent shape, and the diffuser base fabric 45 is integrally joined to each other by forming the vertical side portions 45c of the diffuser base fabrics 45 by sewing, thereby forming a joint portion 46. 23 is formed symmetrically with respect to both sides, in other words, symmetrical with respect to the center line in both directions. The diffuser 23 is formed so as to be gradually narrowed in both directions from the parallel side portion 45b located on the rear side to the parallel side portion 45a located on the front side. The bag body 22 is sewn together with the lower corners 36 and is integrally joined to the lower corners 36, that is, is sewn together. In this state, the diffuser 23 faces the upper side of the gas introduction port 31 (inflator 14) and covers the gas introduction port 31 (inflator 14).

  The airbag device 10 is configured such that when the control device operates the inflator 14 and injects the inflation gas G from the inflator 14 in the event of a car collision, the air stored in the airbag storage portion 18 in a folded state. The bag body portion 22 inflates and expands as the inflation gas G flows from the gas introduction port 31, breaks the tear line of the cover body, and projects from the projection port 17.

  At this time, the diffuser 23 in which both side portions (each inclined side portion 45d) are integrally joined to each lower corner portion 36 of the airbag main body portion 22 is also deployed following the deployment of the airbag main body portion 22. Thus, the expansion gas G injected from the gas inlet 31 upward, which is the opening direction of the gas inlet 31, comes into contact with the lower surface of the diffuser 23 facing the upper side of the gas inlet 31 and causes the diffuser 23 to It is curved in an arch shape and guided in the front-rear direction along the diffuser 23. In this way, when the diffuser 23 is curved in an arch shape, the joint portion 46 prevents the deformation of the diffuser 23 from extending in both directions.

  Therefore, the airbag main body portion 22 is inflated and deployed directly toward the front of the occupant when the inflation gas G flows along the front-rear direction inside, and restrains the occupant in front of the upper half of the occupant seated in the passenger seat. Deploy with the face 28 facing each other, restrain the occupant and protect it from the impact of the collision.

  As described above, in the present embodiment, the diffuser base fabrics 45, 45 are joined in both directions to provide the diffuser 23, whereby the deformation deformation in the both directions of the diffuser 23 is suppressed by the joining portion 46, and the diffuser is expanded at the time of deployment. 23 can function more stably.

  In the second embodiment, the diffuser 23 may be formed by sequentially joining three or more diffuser base fabrics 45 in both directions.

  Further, in each of the above embodiments, the airbag body 22 may be configured by joining the lower surface 25, the side surfaces 26, and the upper surface 27 by joining a plurality of arbitrary base fabrics. Furthermore, these base fabrics may be joined using, for example, an adhesive other than sewing.

  The present invention can be suitably applied to an airbag for a passenger in a passenger seat of a vehicle.

13 Airbag
21a 1st base fabric
21b 2nd base fabric
22 Airbag body
23 Diffuser as a rectifying member
25 Lower surface as main surface
26 Side
31 Gas inlet
34 Bent hole
36 Lower corners that are corners
42 opening
45 Diffuser base fabric, which is a flow straightening member base fabric G Expansion gas

Claims (5)

An airbag that is folded and stored and inflated and deployed by introducing inflation gas,
A bag-like shape having a main surface portion having a gas introduction port into which inflation gas is introduced, and a side surface portion extending at least on both sides of the main surface portion via a corner portion and extending in a direction intersecting the main surface portion in a deployed state. The airbag body,
Both sides of the corner are joined to face the gas inlet, and the rectification guides the expanded gas to the protected object side and the anti-protected object side, which is a direction intersecting the opening direction of the gas inlet. An airbag comprising the member. The airbag according to claim 1, wherein the rectifying member is provided in line symmetry in both side directions. The airbag according to claim 1 or 2, wherein the rectifying member is provided by bonding a plurality of rectifying member base fabrics in both directions. The airbag main body portion is composed of a base fabric having a main surface portion and both side surface portions different from each other, and corner portions are provided by sewing these base fabrics,
The airbag according to any one of claims 1 to 3, wherein both side portions of the rectifying member are sewn together with the corner portions and integrally joined to the corner portions. The air bag body is provided with a vent hole that is located on both side surfaces and allows exhaust of the inflation gas introduced from the gas inlet,
The airflow bag according to any one of claims 1 to 4, wherein the rectifying member includes openings on both sides facing the vent holes in a deployed state.

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