JP4509915B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device that is provided in a seat portion of a vehicle seat and inflates upward at the time of a vehicle collision to restrict forward movement of an occupant's waist.

As an airbag device that is installed in the seat of a vehicle seat and that inflates upward in a vehicle collision and restricts the forward movement of the occupant's waist, a concave portion is integrally formed in a plate-like frame that supports the seat An inflatable portion made of a thin metal plate is provided so as to form a chamber with this recess, and in the event of a vehicle collision, gas is generated by an inflator provided in the chamber to inflate the metallic inflatable portion so that the seat portion faces upward. There is what bulges (see Patent Document 1).
Special table 2003-517966 gazette

  By the way, the air bag apparatus described above is provided with a vent hole for exhausting gas to the inflatable part. However, simply providing the vent hole makes the vent hole in detail with respect to changes in the internal pressure of the inflatable part. I can't control it.

  Accordingly, an object of the present invention is to provide an airbag device capable of controlling the vent holes in detail with respect to changes in the internal pressure of the inflatable portion.

In order to achieve the above object, an invention according to claim 1 is provided in a seat portion (for example, a seat cushion 15 in the embodiment) of a vehicle seat (for example, the seat 12 in the embodiment), and an inflator (for example, implementation) at the time of a vehicle collision. An inflatable portion (for example, the air bag body 30 in the embodiment) in which a vent hole (for example, the vent hole 94 in the embodiment) is formed in the bottom portion and is always in communication with the outside by the fluid generated by the inflator 33) in the form. An air bag device (for example, the air bag module 11 in the embodiment) having the air hole formed by deformation of an easily deformable portion (for example, the truncated cone portion 90 in the embodiment) that deforms outward due to an increase in internal pressure of the inflatable portion. direction are provided so as to be changed, the deformable portion, that protrudes on the inside of the expansion portion It is formed in a frustum shape, wherein the vent hole so that the orientation on the slopes of the easily deformable portion is focusing direction have been formed, on the outside of the deformable portion by increased internal pressure of the expansion portion is the expansion portion By projecting, the direction of the vent hole is changed to a radial direction.

According to the invention of claim 1, since the vent hole formed in the bottom portion of the expansion portion is provided to be changed can direction at a deformation of the easily deformable portion which is deformed outwardly by the internal pressure rise in the expansion unit, The air holes can be controlled in detail with respect to changes in the internal pressure of the expansion portion.

Further, in the state the internal pressure is not so high, to discharge the fluid while vent that is resistant to the deformable portion from the slopes of the easily deformable portion formed in a circular truncated cone shape that protrudes on the inside of the expansion portion When the internal pressure is further increased, the easily deformable portion protrudes to the outside of the expansion portion, and thus a large amount of fluid is discharged from the vent hole while the resistance is kept small. Therefore, the direction of the air vent can be controlled in detail with respect to a change in the internal pressure of the expansion portion with a simple configuration in which the air vent is formed on the inclined surface of the substantially frustoconical easily deformable portion. Furthermore, at the initial stage when the inflator generates gas, outside air is introduced from the vent hole into the expansion part due to the aspiration effect, and the amount of fluid is increased. At this time, the easily deformable part protruding inside the expansion part A large amount of outside air can be introduced into the vent hole while the resistance is suppressed. Further, when the internal pressure rises and the easily deformable portion protrudes outside the expansion portion, the volume in the expansion portion rapidly increases, and the pressure in the expansion portion can be rapidly reduced.

The airbag apparatus of the reference technique will be described below with reference to FIGS.
FIG. 1 is an exploded perspective view showing a vehicle seat 12 to which an airbag module 11 as an airbag device of a reference technology is attached. The seat 12 is provided spaced apart in the vehicle width direction and extends in the vehicle front-rear direction. A pair of extending seat rails 13, sliders 14 slidably provided on the respective seat rails 13, and seat cushions (seat portions) that are supported by these sliders 14 and are disposed substantially horizontally to support the occupant mainly under the waist. ) 15, a seat back 16 that is rotatably provided at the rear end of the slider 14 in the vehicle front-rear direction and supports the back of the occupant mainly in the standing state, and is provided on the opposite side of the seat cushion 15 of the seat back 16. And a headrest 17 that mainly supports the back of the occupant.

  The seat cushion 15 is mounted on the upper side of the pan bracket 20 fixed to the inside of each slider 14, the connecting bracket 21 extending in the vehicle width direction so as to connect the left and right pan brackets 20, and both the pan brackets 20. The seat pan 22 is placed and fixed to the both pan brackets 20, and the cushion pad 23 is supported on the seat pan 22 by being placed on the upper side of the seat pan 22. The cushion pad 23 is a seat on which an occupant sits, and is formed by covering urethane foam with a skin.

As shown in FIG. 2, the airbag module 11 of the reference technique is attached to a predetermined position in the seat cushion 15 that supports the cushion pad 23 in the seat pan 22. In addition, the opening part 24 is formed in the position which attaches the airbag module 11 of the seat pan 22, and the airbag module 11 is attached so that this opening part 24 may be straddled forward and backward.

  As shown in FIG. 3, the airbag module 11 includes a main panel 26 that is joined at both ends to form a cylindrical shape, a reinforcing plate 27 that is joined to the inside of the main panel 26, and both side openings 28 in the main panel 26. For supporting the seat pan 22 joined to the outside of the airbag body 30 as shown in FIG. 4 and an airbag body (inflatable portion) 30 comprising a pair of side panels 29 joined so as to cover And a substantially cylindrical inflator 33 that is held by the airbag main body 30 and the mounting bracket 32 and can introduce gas (fluid) into the airbag main body 30.

  As shown in FIG. 3A, the main panel 26 is formed by bending a thin plate of equal width made of a metal that is a plastic material, and both ends are joined together as shown in FIG. 3B. Formed. That is, as shown in FIG. 5, the main panel 26 has a thin plate that is substantially rectangular in shape and forms a bottom portion of the airbag body 30, and an edge on one long side of the bottom plate portion 35. A first curved plate portion 36 extending in an arc shape so as to be folded back from the portion, and a second curved portion extending in an arc shape so as to be folded back from an end edge portion on the opposite side of the bottom plate portion 35 of the first curved plate portion 36. A curved plate portion 37, a third curved plate portion 38 that extends in an arc shape so as to be folded back from an end edge of the second curved plate portion 37 opposite to the first curved plate portion 36, and the third curved plate A first upper plate portion 39 extending on an extension line from an end edge portion of the plate portion 38 opposite to the second curved plate portion 37, and a first edge portion on the other long side of the bottom plate portion 35. A fourth curved plate portion 40 extending in an arc shape so as to be folded back on the same side as the curved plate portion 36, and a bottom plate of the fourth curved plate portion 40 A fifth curved plate portion 41 extending in an arc shape so as to be folded back from an end edge on the opposite side to 35, and an end edge on the opposite side of the fourth curved plate portion 40 of the fifth curved plate 41. A sixth curved plate portion 42 extending in an arc shape so as to be folded back, and a second upper portion extending from the end edge portion of the sixth curved plate portion 42 opposite to the fifth curved plate portion 41 onto the extension line It forms in the shape which has the board part 43, and it forms by superimposing the 1st upper board part 39 and the 2nd upper board part 43, or butting and joining.

  In the state where the first upper plate portion 39 and the second upper plate portion 43 are joined, the first curved plate portion 36 and the fourth curved plate portion 40 are mirror-symmetrical, and the second curved plate portion 37 and The fifth curved plate portion 41 has mirror symmetry, the third curved plate portion 38 and the sixth curved plate portion 42 have mirror symmetry, and the joined first upper plate portion 39 and second upper plate portion 43. The bottom plate portion 35 is in parallel. When the main panel 26 is viewed from the opening direction with the first upper plate portion 39 and the second upper plate portion 43 being joined, the first curved plate portion 36, the second curved plate portion 37, The third curved plate portion 38, the fourth curved plate portion 40, the fifth curved plate portion 41, and the sixth curved plate portion 42 have a hexagonal substantially polygonal shape with corners.

  Here, in the bottom plate portion 35 of the main panel 26, as shown in FIG. 4, there is a housing portion 44 that is recessed from the outer surface into a semi-cylindrical shape and protrudes from the inner surface into a semi-cylindrical shape in order to hold the inflator 33 in a partially housed state. In the housing portion 44, an introduction hole 44A shown in FIG. 3A for introducing the gas generated by the inflator 33 into the airbag body 30 is formed.

  The reinforcing plate 27 described above is made of metal and is joined to the inner surface of the bottom plate portion 35 of the main panel 26 to reinforce the bottom plate portion 35. The reinforcing plate 27 is formed with a fitting portion 45 having the same shape as that of the housing portion 44 of the bottom plate portion 35 of the main panel 26 and fitting the fitting portion 45. An introduction hole 45A is formed in alignment with the introduction hole 44A.

In the reference technique , a pair of vent holes (ventilation holes) for discharging gas from the airbag body 30 as shown in FIG. 6 at both side positions in the axial direction of the housing portion 44 in the bottom plate portion 35 of the main panel 26. 45 is penetratingly formed in a range not covered with the reinforcing plate 27 of the bottom plate portion 35.

  These vent holes 49 are disposed on the opposite side to the opening direction of the introduction hole 45A, which is the gas output direction of the inflator 33 (the inflation direction of the airbag body 30). Further, these vent holes 49 are bifurcated slits that are connected to the opposite side (one end side) to the fitting part 45 and separated from the fitting part 45 side (the other end part side). As shown in FIG. 7 (a), the inner edge 46 forms a U-shape consisting of a semicircular portion 46a and a pair of parallel straight portions 46b, 46c connected to the end of the semicircular portion 46a and the outer edge. The portion 47 also has a U-shape consisting of a semicircular portion 47a and a pair of parallel straight portions 47b and 47c connected to the end of the semicircular portion 47a, and the edge portion 46 and the edge portion 47 are substantially equally spaced over the entire length. It is made into a U-shaped symmetrical shape as a whole.

  By forming the vent hole 49, the bottom plate portion 35 is opposite to the fitting portion 45 with the position between the end portions of the vent hole 49 on the fitting portion 45 side as the base end portion inside the vent hole 49. A tongue-like rocking plate portion (easily deformable portion) 48 extending to the side is formed. The swing plate portion 48 is defined by the vent hole 49, so that the portion facing the vent hole 49 is separated from the other portions of the bottom plate portion 35, and as a result, FIG. As shown in b), the airbag body 30 is deformed so as to be bent in a hinge shape around the base end side connected to the other part of the bottom plate portion 35 due to an increase in internal pressure of the airbag body 30. As a result, the swing plate portion 48 swings around the base end side, and the opening amount of the vent hole 49 is increased. The swing plate portion 48 can be deformed along the gas output direction of the inflator 33.

  As shown in FIG. 3, the side panel 29 is formed by extruding and punching a thin plate made of a metal which is a plastic material, and the outer peripheral edge portion is arranged on the same plane to define the opening 50. In addition, the outer peripheral edge side is a cylindrical wall portion 51 that is substantially perpendicular to the entire outer peripheral edge portion, and the opposite side of the wall portion 51 from the opening 50 is a bottom 52. The wall portion 51 of the side panel 29 is joined to the opening portion 28 of the main panel 26, and the shape is matched with the opening portion 28 of the main panel 26. That is, as shown in FIG. 5, the wall portion 51 is folded back in an arc shape from the substantially rectangular first flat wall plate portion 54 and an end portion on one long side of the first flat wall plate portion 54. A first curved wall plate portion 55, a second curved wall plate portion 56 that is folded back in an arc shape from an end edge of the first curved wall plate portion 55 opposite to the first flat wall plate portion 54, and the second curved wall plate portion 56; A third curved wall plate portion 57 that turns back in an arc shape from an end edge of the curved wall plate portion 56 opposite to the first curved wall plate portion 55, and a second curved wall plate portion of the third curved wall plate portion 57. 56, the second flat wall plate portion 58 extending on the extension line from the end edge on the side opposite to the end portion 56, and the same side as the first curved wall plate portion 55 from the other end edge portion of the first flat wall plate portion 54. 4th curved wall plate part 59 which is folded back in an arc shape, and a fifth curved wall plate part 60 which is folded back in an arc shape from the edge of the fourth curved wall plate part 59 opposite to the first flat wall plate part 54. When, The fifth curved wall plate portion 60 has a sixth curved wall plate portion 61 that is folded back in an arc shape from an end edge on the side opposite to the fourth curved wall plate portion 59. An end edge portion of the 61 opposite to the fifth curved wall plate portion 60 is connected to a side of the second flat wall plate portion 58 opposite to the third curved wall plate portion 57.

  Also in this side panel 29, the first curved wall plate portion 55 and the fourth curved wall plate portion 59 have mirror symmetry, the second curved wall plate portion 56 and the fifth curved wall plate portion 60 have mirror symmetry, The third curved wall plate portion 57 and the sixth curved wall plate portion 61 are mirror-symmetrical, and the first flat wall plate portion 54 and the second flat wall plate portion 58 are parallel to each other. Further, when viewed from the opening direction (thickness direction), the side panel 29 has a first curved wall plate portion 55, a second curved wall plate portion 56, a third curved wall plate portion 57, and a fourth curved wall plate portion. 59, the 5th curved wall board part 60 and the 6th curved wall board part 61 have comprised the hexagonal substantially polygonal shape which makes a corner | angular.

  The side panel 29 is fitted to both the opening portions 28 of the main panel 26 so that the bottom portion 52 is on the insertion tip side. In this state, the first flat wall plate portion 54 is attached to the bottom plate portion 35. The first curved wall plate portion 55 is formed on the curved plate portion 36, the second curved wall plate portion 56 is formed on the second curved plate portion 37, the third curved wall plate portion 57 is formed on the third curved plate portion 38, and the first upper plate. The second flat wall plate portion 58 is formed on the portion 39 and the second upper plate portion 43, the fourth curved wall plate portion 59 is formed on the fourth curved plate portion 40, and the fifth curved wall plate portion 60 is formed on the fifth curved plate portion 41. The sixth curved wall plate portion 61 is joined to the sixth curved plate portion 42 without any gap. In addition, joining of each above-mentioned part will be performed, for example by migrowel welding.

  The airbag main body 30 configured by closing both ends of the main panel 26 with the side panels 29 as described above includes the first upper plate portion 39 and the second upper plate portion 43 of the main panel 26, and the bottom plate portion 35. Are pressed so as to be folded in the direction in which they are brought close to each other and plastically deformed (state shown in FIG. 3C).

  As shown in FIG. 4, the mounting bracket 32 is formed with a receiving portion 75 that is recessed in a semi-cylindrical shape from the upper surface and protrudes in a semi-cylindrical shape from the lower surface in order to hold the inflator 33 in a partially stored state. The mounting bracket 32 is joined to the outer surface of the bottom plate portion 35 of the main panel 26 of the airbag body 30 with the inflator 33 being accommodated between the accommodation portion 75 and the accommodation portion 44 of the airbag body 30. The mounting bracket 32 has a wider range than the vent hole 49 and the swing plate portion 48 so as not to hinder the exhaust from the vent hole 49 of the attached airbag body 30 and the swing of the swing plate portion 48. An opening (not shown) that opens is formed.

  In this way, the inflator 33 and the mounting bracket 32 are attached to the airbag body 30, one end side of the mounting bracket 32 and the airbag body 30 is slightly bent, and the upper side is covered with the waterproof cover 77. The airbag module 11 is formed. As shown in FIG. 2, the airbag module 11 is fixed to a predetermined position on the upper side of the seat pan 22 of the seat cushion 15 in a state where the length direction is along the vehicle width direction and the vehicle is inclined upward. The upper side is covered with a cushion pad 23. At this time, the opening 24 of the seat pan 22 is wider than the vent hole 49 and the swing plate portion 48 so as not to hinder the exhaust from the vent hole 49 of the airbag body 30 and the swing of the swing plate portion 48. It is open at.

  In the airbag module 11 described above, the inflator 33 is ignited when the deployment condition such as, for example, a gravitational acceleration of a predetermined value or more is detected at the time of a vehicle collision, and the airbag body 30 in the folded state is With the generated gas, as shown by a two-dot chain line in FIG. 2, the cover 77 is broken slightly diagonally upward and inflated, and the cushion pad 23 is pressed upward. Then, the middle position of the cushion pad 23 bulges upward to form a bulging portion 23a, and the lower back of the occupant who is seated on the seat 12 and wearing the seat belt is restrained from the front, and the front of the waist The movement will be restricted. At this time, if a large load is applied to the airbag main body 30 from the occupant's lower back after the gas generation of the inflator 33 is finished, for example, as shown in FIG. 8, the load applied from the lower occupant's lower back is deformed. Absorb. At this time, the gas in the airbag main body 30 escapes from the vent hole 49. However, depending on the load from the occupant, the escape from the vent hole 49 cannot follow, and the internal pressure of the airbag main body 30 may become too high. However, at that time, the swinging plate portion 48 swings and deforms outward at an angle corresponding to the internal pressure due to the increasing internal pressure, and the vent hole 49 expands the opening amount and discharges the gas at a large flow rate.

According to the reference technique described above, the vent hole 49 formed in the bottom plate portion 35 of the airbag main body 30 reduces the opening amount by the deformation of the swinging plate portion 48 that is deformed outward by the increase in the internal pressure of the airbag main body 30. Since it can be changed, the vent hole 49 can be controlled in detail with respect to changes in the internal pressure of the airbag body 30. That is, as described above, when the airbag body 30 is deformed and absorbs a load applied from below the occupant's waist, the vent hole 49 formed of a bifurcated slit is formed in the airbag when the load is low and the internal pressure is not so high. When the gas is discharged from the main body 30 as it is and the load is high and the internal pressure is high, the easily deformable swinging plate portion 48 defined inside the vent hole 49 is on the base end side of the vent hole 49. By deforming around the center, the opening amount is increased and the fluid discharge amount is increased. Thus, the vent hole 49 can be controlled in detail with respect to changes in the internal pressure of the airbag body 30 with a simple configuration in which the shape of the vent hole 49 is devised.

  Here, for example, a reinforcing plate (not shown) is joined to at least one of the upper surface and the lower surface of the bottom plate portion 35 so as to cover the proximal end portion of the swing plate portion 48, and the proximal end portion which is a hinge point is joined. By changing the strength, the swing angle of the swing plate portion 48, that is, the opening degree of the vent hole 49 can be controlled.

In the reference technique described above, various modifications can be applied to the vent hole 49 as long as the vent hole 49 has a bifurcated shape in which one end is connected and the other end is separated. For example, with respect to the above vent hole 49 shown in FIG. 9A, the width of the inner edge 46 and the outer edge 47 is increased as shown in FIG. May be. Further, as shown in FIG. 9 (c), the vent hole 49 is formed in a U-shape in which the inner edge portion 46 is formed by connecting three adjacent linear portions 46d, 46e, and 46f perpendicularly to each other, and on the outer side. Also, the edge of each of the three linear portions 47d, 47e, 47f may be formed in a U-shape that is adjacent to each other and connected vertically, and may have a symmetrical shape that forms a U-shape as a whole. Further, as shown in FIG. 9 (d), the vent hole 49 is formed in a U shape in which the inner edge portion 46 is formed by connecting three adjacent linear portions 46d, 46e, and 46f perpendicularly to each other, and on the outer side. The edge portion 47 is formed in a U-shape consisting of a semicircular portion 47a and a pair of parallel straight portions 47b, 47c connected to the end portions of the semicircular portion 47a, and has a generally U-shaped symmetrical shape as a whole. It is also good. In addition, as shown in FIG. 9 (e), the vent hole 49 is formed in a V shape in which the inner edge 46 is connected with two straight parts 46g and 46h at an acute angle, and the outer edge 47 is The three linear portions 47d, 47e, 47f may be adjacent to each other so as to form a U-shape that is perpendicular to each other, and may have a U-shaped symmetrical shape as a whole. Further, as shown in FIG. 9 (f), the vent hole 49 is formed in a U shape in which the inner edge portion 46 is formed by connecting three adjacent linear portions 46d, 46e, 46f perpendicularly to each other, and on the outer side. The edge portion 47 has a U-shape consisting of a semicircular portion 47a and a pair of parallel straight portions 47b and 47c connected to the end of the semicircular portion 47a, and has a generally U-shaped symmetrical shape as a whole. The interval between the semicircular portion 47a of the outer edge portion 47 and the central straight portion 46e of the inner edge portion 46 may be widened.

  Further, as shown in FIG. 10A, the inner edge 46 and the outer edge 47 are connected by a connecting portion 84 at a predetermined intermediate position of the vent hole 49 and connected by the internal pressure of the airbag main body 30. The rocking plate portion 48 may be rocked by mechanically breaking the portion 84. Although FIG. 10A illustrates an example in which the connecting portion 84 is provided in the vent hole 49 of FIG. 9D, the connecting portion 84 can be provided in another vent hole 49. Further, as shown in FIG. 10 (b), the vent hole 49 has a U-shape consisting of a pair of parallel straight portions 47b and 47c whose outer edge is connected to the semicircular portion 47a and the end of the semicircular portion 47a. The inner edge 46 is connected to the two straight portions 46i, 46j adjacent to each other vertically, and one straight portion 46j is further connected to the straight portion 46l via the arc portion 46k. It is good also as what has a letter shape and was made into the asymmetrical shape of substantially U shape as a whole. Further, as shown in FIG. 10 (c), the vent hole 49 is formed of a U-shaped portion having an outer edge 47 formed of a semicircular portion 47a and a pair of parallel straight portions 47b and 47c connected to the end of the semicircular portion 47a. The inner edge 46 has a shape having a straight portion 46m, an arc portion 46n, and a straight portion 46o inclined with respect to the straight portion 46m, and has a generally U-shaped asymmetric shape as a whole. It is also good. Various other changes are possible.

Next will be described focusing on differences from the reference technology to the following reference to the air bag device mainly 11 and 12 of the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part similar to a reference technique, and the description is abbreviate | omitted.

In the first embodiment, at the position of the bottom plate portion 35 that is inside the opening (not shown) of the mounting bracket 32 of the airbag body 30 and that is inside the opening 24 of the seat pan 22, FIG. As shown in FIG. 3, a substantially truncated cone-shaped truncated cone portion 90 that protrudes inside the airbag main body 30 is formed. The truncated cone portion 90 has a tapered portion (slope) 91 protruding so as to become thinner from the bottom plate portion 35 and a top plate portion 92 parallel to the bottom plate portion 35 that closes the upper end portion of the tapered portion 91. is doing. A plurality of rectangular vent holes (vent holes) 94 are formed at equal intervals in the taper portion 91, and these vent holes 94 are oriented in the inside / outside direction (direction from inside to outside) of the airbag body 30. Is inward (focusing direction).

  The aforementioned truncated cone part 90 is easily deformed by making the tapered part 91 thinner than the bottom plate part 35. As a result, the air from the state in which the tapered part 91 protrudes inside the airbag body 30 as described above. By increasing the internal pressure of the bag body 30, as shown in FIG. 11 (b), it is possible to reverse (so-called buckling) and to protrude to the outside (lower side) of the airbag body 30. . In a state where the truncated cone part 90 protrudes to the outside of the airbag body 30, the direction of the inside and outside of the airbag body 30 of each vent hole 94 is outward (radial direction). As a result, the gas can be discharged radially from the vent holes 94 formed at equal intervals in the tapered portion 91 in a balanced manner. That is, the direction of the vent hole 94 can be changed by the deformation of the truncated cone portion 90 that is deformed outward by the increase in the internal pressure of the airbag body 30.

According to the first embodiment described above, the vent hole 94 formed in the truncated cone part 90 at the bottom of the airbag body 30 has the truncated cone part 90 that protrudes and deforms outward due to an increase in the internal pressure of the airbag body 30. Since the direction can be changed by deformation, the vent hole 94 can be controlled in detail with respect to a change in the internal pressure of the airbag body 30. That is, in a state where the internal pressure is not so high, the vent hole 94 is directed inwardly into the truncated cone part 90 from the tapered part 91 of the truncated cone part 90 protruding to the inside of the airbag body 30, that is, in a state in which the exhaust holes are mutually resistant to exhaust. When the internal pressure is further increased, the frustum portion 90 protrudes to the outside of the airbag main body 30 so that the vent holes 94 face outward, that is, the resistance is suppressed to a low level without causing resistance to exhausting each other. A lot of gas will be discharged. Therefore, the vent hole 94 can be controlled in detail with respect to a change in the internal pressure of the airbag body 30 with a simple configuration. Furthermore, at the initial stage when the inflator 33 generates gas, outside air is introduced into the airbag main body 30 from the vent hole 94 due to the aspiration effect, and the amount of gas is earned. The vent hole 94 of the frustoconical portion 90 projecting outwardly can be introduced outwardly, that is, it can introduce a large amount of outside air in a state where resistance to air intake is not reduced and resistance is reduced, and the airbag body 30 can be inflated immediately. it can. Further, when the internal pressure rises and the truncated cone part 90 protrudes to the outside of the airbag main body 30, the volume in the airbag main body 30 increases rapidly, and the pressure in the airbag main body 30 is rapidly reduced. be able to.

  The amount of ventilation can be controlled by changing the number and size of the vent holes 94, the diameter and width of the truncated cone portion 90, and the operating pressure of the buckling can be set to an arbitrary pressure. Further, for example, as shown in FIGS. 12A and 12B, the vent hole 94 may be formed so as to open from the tapered portion 91 to the bottom plate portion 35. Further, although not shown, the vent hole 94 may be formed so as to open from the tapered portion 91 to the top plate portion 92, and the vent hole 94 is opened from the bottom plate portion 35 to the tapered portion 91 and further to the top plate portion 92. You may form as follows.

In the first embodiment described above, although not shown in the drawings, the airbag control unit for driving the inflator 33 has a driving condition for each inflator 33 of the airbag module 11 provided in each seat 12. This includes that the corresponding seat belt for the seat 12 determined by the seat belt attachment / detachment detection signal output from the attachment / detachment sensor provided on the seat belt buckle is attached to the buckle. That is, when the seat belt is attached, the airbag body 30 of the airbag module 11 is allowed to deploy, and when the seat belt is not attached, the airbag body 30 is prohibited from being deployed. Similarly, the deployment of the airbag body 30 of the airbag module 11 may be interlocked with a seat belt pretensioner that is permitted to operate when the seat belt is attached and prohibited when the seat belt is not attached.

Furthermore, the occupant's physique and seating position are determined from the occupant's physique determination signal and the seating position signal from the occupant detection device provided in the seat cushion 15 and the seat rail 13, and the airbag module 11 is moved up and down based on the result. -You may comprise so that it may move to at least any one direction of front and rear and right and left.
In addition, the airbag body 30 may be formed of a resin that is a plastic material other than metal, and one of the main panel 26 and the side panel 29 may be formed of metal and the other may be formed of resin.

It is a disassembled perspective view which shows the seat to which the airbag apparatus of reference technology was applied. It is a sectional side view which shows the principal part of the seat to which the airbag apparatus of the reference technique was applied. It is a perspective view which shows the airbag main body in the airbag apparatus of a reference technique , Comprising: (a) shows a disassembled state, (b) shows an assembled state, (c) shows the state folded after assembly, respectively. . It is a sectional side view which shows the airbag apparatus of a reference technique . It is a side view which shows the state before folding of the airbag main body in the airbag apparatus of reference technology . It is a perspective view which shows the state at the time of expansion | deployment of the airbag main body in the airbag apparatus of reference technology . It is a perspective view which shows the vent hole in the airbag apparatus of a reference technique , Comprising: (a) shows the state before a deformation | transformation, (b) shows the state after a deformation | transformation, respectively. It is a perspective view which shows the deformation | transformation state which received the load from the passenger | crew of the airbag main body in the airbag apparatus of reference technology . It is a perspective view which shows the modification of the vent hole in the airbag apparatus of a reference technique . It is a perspective view which shows the modification of the vent hole in the airbag apparatus of a reference technique . It is a perspective sectional view showing the vent hole periphery in the airbag apparatus of a 1st embodiment of the present invention, (a) shows the state before modification, and (b) shows the state after modification, respectively. It is a perspective sectional view showing the modification of the vent hole periphery in the airbag device of a 1st embodiment of the present invention, (a) shows the state before modification, and (b) shows the state after modification, respectively. It is.

Explanation of symbols

11 Airbag module (airbag device)
12 seats 15 seat cushion (seat)
30 Airbag body (inflatable part)
33 Inflator 48 Oscillating plate part (easy deformation part)
49,94 Vent hole
90 Frustum part (easy deformation part)

Claims (1)

An airbag device having an inflatable portion provided in a seat portion of a vehicle seat and inflated upward by a fluid generated by an inflator at the time of a vehicle collision and having a vent hole constantly communicating with the outside at a bottom portion,
The vent hole is provided so that the direction can be changed by deformation of the easily deformable portion that deforms outward due to an increase in internal pressure of the expansion portion,
The deformable portion is formed in a circular truncated cone shape that protrudes on the inside of the expansion portion,
The vent hole is formed so that the direction of the inclined surface of the easily deformable portion is a converging direction, and the easily deformable portion protrudes to the outside of the expandable portion due to an increase in internal pressure of the expandable portion, whereby the direction of the vent hole The airbag device is characterized in that the air bag is changed in the radial direction.

Images