JP2007283955A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device capable of preventing flooding of liquid passing through a pad of a seat cushion up to an airbag. <P>SOLUTION: This airbag device is furnished with a case 31 provided below the pad of the seat cushion of a vehicle and an upper part of which opens, the airbag 32 stored in the case 31 and a cover body 33 to close an opening of an upper part of the case 31, and a peripheral edge part 51 of the cover body 33 is placed on an opening edge part 37 of the upper part of the case 31, extended outward from the opening edge part 37 and bends an end edge part 53 positioned outside of the opening edge part 37 downward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an airbag device that is provided below a pad of a vehicle seat cushion and inflates upward to restrict forward movement of an occupant's waist.

As an airbag device that is provided below a pad of a vehicle seat cushion and inflates upward to restrict the forward movement of the occupant's waist, the air is placed in a recess formed in a seat pan. There is a structure in which a bag is provided and a cover is attached to a seat pan so as to cover the recess (for example, see Patent Document 1).
JP 2005-126051 A

  By the way, an occupant may spill liquids such as beverages on the vehicle seat, and in the airbag device having the structure described above, the liquid that has passed through the pad of the seat cushion travels through the seat pan and the gap between the cover and the seat pan. There was a possibility that the capillarity could enter the recess and flood the airbag.

  Therefore, an object of the present invention is to provide an airbag device that can prevent liquid that has passed through the pad of the seat cushion from being immersed in the airbag.

  In order to achieve the above object, the invention according to claim 1 is provided below a pad (for example, the cushion pad 23 in the embodiment) of a vehicle seat cushion (for example, the seat cushion 15 in the embodiment), and an upper portion is opened. A case (for example, the case 31 in the embodiment), an airbag (for example, the airbag 32 in the embodiment) accommodated in the case, and a cover body (for example, the cover body 33 in the embodiment) that closes the upper opening of the case. An air bag device (for example, the air bag module 11 in the embodiment), and a peripheral portion (for example, the entire peripheral portion 51 in the embodiment) of the cover body is an opening edge portion (for example, the exemplary embodiment) of the upper part of the case. And is extended outward from the opening edge, and Is characterized in that it edges located outside the (frame plate section 53 in the example embodiment) is bent downward from the opening edge.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the end edge portion is separated from the opening edge portion.

  According to the first aspect of the present invention, the peripheral edge portion of the cover body that closes the opening at the upper portion of the case that stores the airbag is placed on the opening edge portion at the upper portion of the case, and is disposed outside the opening edge portion. Since the end edge that extends outward and is located outside the opening edge is bent downward, the edge that is bent downward stops the liquid that has passed through the pad of the seat cushion. This prevents water from entering the gap between the case and the cover body. Therefore, it is possible to prevent the liquid that has passed through the pad of the seat cushion from entering the airbag.

  According to the second aspect of the present invention, since the end edge portion bent downward from the peripheral edge portion of the cover body is separated from the opening edge portion of the case, water can surely be immersed in the gap between the case and the cover body. To stop. Therefore, the liquid that has passed through the pad of the seat cushion can be more reliably prevented from entering the airbag.

An airbag apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view showing a vehicle seat 12 to which an airbag module 11 as an airbag device of the present embodiment is attached. The seat 12 is provided in the vehicle width direction so as to be separated from the vehicle width direction. A pair of seat rails 13, sliders 14 slidably provided on the respective seat rails 13, and seat cushions 15 that are supported by these sliders 14 and arranged substantially horizontally to support the occupant mainly under the waist. The seat 14 is pivotally provided at the rear end of the slider 14 in the front-rear direction of the vehicle. The seat back 16 mainly supports the back of the occupant in the standing state, and the occupant is provided on the opposite side of the seat cushion 15 of the seat back 16. And a headrest 17 for mainly supporting the back of the head.

  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 (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 present embodiment is attached to a predetermined position in the seat pan 22 that supports the cushion pad 23 in the seat cushion 15, and as a result, the airbag module 11. Is disposed below the cushion pad 23 of the seat cushion 15. An attachment opening 24 for attaching the airbag module 11 is formed at a predetermined intermediate position of the seat pan 22. As shown in FIG. 1, a pedestal portion 25 that is one step higher than the outer portion is formed at the peripheral edge of the mounting opening 24 of the seat pan 22, and the pedestal portion 25 includes the airbag module 11. A mounting hole 26 for mounting and a clearance groove 27 are formed.

  As shown in FIG. 3, the airbag module 11 includes a bottomed box-shaped case 31 having an opening 30 at the top, an airbag 32 stored in a folded state in the case 31, And a cover body 33 that closes the opening 30.

  The case 31 is made of metal, and has a substantially rectangular horizontally long bottom plate portion 35, a square cylindrical peripheral wall portion 36 that rises from the entire peripheral edge of the bottom plate portion 35, and an outer periphery from the entire peripheral edge of the upper end portion of the peripheral wall portion 36. And a flange portion 37 that extends to form an opening edge portion. Here, a plurality of attachment holes 38 for attaching the cover body 33 are formed in the flange portion 37, and a plurality of attachment holes 39 shown in FIG. 4 for attachment to the seat pan 22 are formed. An attachment hole 40 for attaching the airbag 32 is formed in the bottom plate portion 35, and an insertion hole 41 through which the wiring W to the airbag 32 is inserted is also formed.

  The airbag 32 is disposed in the airbag main body 42 while being held by the bag-shaped airbag main body 42 and the mounting bracket 43, and has a substantially cylindrical shape capable of introducing gas (fluid) into the airbag main body 42. And an inflator 44. Here, in the mounting bracket 43, a mounting bolt 46 is fixed to a mounting hole 45 formed therein by welding or the like, and the mounting bolt 46 is inserted into a mounting hole 47 formed in the airbag body 42. When the nut 48 is screwed after being inserted into the mounting hole 40 of the bottom plate portion 35 of the case 31 and providing the seal ring 48 a and the washer 48 b at the tip thereof, the airbag 32 is attached to the case 31.

  Further, the wiring W for driving the inflator 44 of the airbag 32 is inserted into the insertion hole 41 and led out of the case 31. The gap between the insertion hole 41 and the wiring W is made of, for example, rubber. The sealing member 49 is sealed. The seal member 49 may be integrally formed with the wiring W. It is also possible to form the insertion hole 41 in the peripheral wall portion 36 of the case 31 and allow the wiring W to be inserted. In this case as well, these gaps are similarly sealed with a seal member. 3, for the sake of convenience, the cross-sectional position of the mounting portion of the mounting bolt 46 includes another cross-sectional position where the seal member 49 is disposed.

  The cover body 33 is made of a synthetic resin and has a substantially flat top plate portion 52. The top plate portion 52 has an intermediate cover portion 50 that closes the opening portion 30 of the case 31, and an outer side than the cover portion 50, that is, from the opening portion 30 with the cover portion 50 closing the opening portion 30 of the case 31. Also has an entire peripheral edge (peripheral edge) 51 located on the outer side, and this entire peripheral edge 51 is placed on the flange 37 over the entire circumference and extends further outward than the flange 37. To do. Further, the cover body 33 has a frame plate portion 53 that bends downward substantially perpendicularly to the top plate portion 52 from the entire peripheral edge portion of the top plate portion 52 so as to constitute the end edge portion thereof. Yes. Here, the outward extension amount of the entire peripheral edge portion 51 from the flange portion 37 is an extension amount for separating the frame plate portion 53 from the flange portion 37.

  An attachment hole 55 is formed in the top plate portion 52 so as to be aligned with the attachment hole 38 of the flange portion 37 of the case 31, and the attachment hole 56 is aligned with the attachment hole 39 of the flange portion 37 shown in FIG. Is formed. Further, as shown in FIG. 3, a plurality of thin tear lines 57 and 58 that promote breakage when the airbag 32 is inflated are formed in parallel on the top plate portion 52 on the inner surface of the case 31 near the center. ing. Further, in the vicinity of the boundary with the flange portion 37 of the case 31, a pair of thin bending lines 59 for facilitating the bending are provided on the inner surface, and a pair of similar bending lines 60 are provided on the outer surface in parallel with the tear lines 57 and 58. Is formed. In order to facilitate outward bending, the outer surface bending line 60 is formed slightly outside the inner surface bending line 59 adjacent thereto.

  The top plate portion 52 includes a plurality of mounting holes 55, bolts 65 inserted through the plurality of mounting holes 38 formed in the flange portion 37 of the case 31, and a pair of rubber seals through which the bolts 65 are inserted. The case 66 is fixed to the case 31 by a ring 66, a pair of washer rings 67, and a nut 68 screwed into each bolt 65.

  That is, the bolt 65 is inserted into the washer ring 67, the seal ring 66, the attachment hole 55 of the cover body 33, the attachment hole 38 of the case 31, the seal ring 66 and the washer ring 67 in order from the upper side, and screwed into the nut 68. Thus, the cover body 33 is fixed to the case 31. At this time, by tightening the bolt 65 and the nut 68, the seal rings 66 on both sides are crushed and seal the gaps between the mounting holes 55, 38 on both sides and the bolts 65.

  As described above, the airbag module 11 is configured by attaching the cover body 33 to the case 31 containing the airbag 32 including the inflator 44, the mounting bracket 43, and the airbag body 42. The module 11 is inserted from above into the mounting opening 24 of the seat pan 22 in the peripheral wall portion 36 of the case 31, and as shown in FIG. 4, the peripheral portion of the mounting opening 24 of the seat pan 22 in the flange portion 37 of the case 31. Placed on the pedestal 25. At this time, the bolt 65 and the nut 68 enter the escape groove 27 shown in FIG. In this state, as shown in FIG. 4, the remaining plurality of mounting holes 56 of the cover body 33, the remaining plurality of mounting holes 39 of the case 31, and the mounting holes 26 formed in the pedestal 25 are respectively inserted. The airbag module 11 is fixed to the seat pan 22 by the bolts 70 to be inserted, a pair of rubber seal rings 71 and a pair of washer rings 72 through which the bolts 70 are inserted, and nuts 73 screwed into the bolts 70. Is done.

  That is, the bolts 70 are inserted into the washer ring 72, the seal ring 71, the attachment hole 56 of the cover body 33, the attachment hole 39 of the case 31, the attachment hole 26 of the seat pan 22, the seal ring 71 and the washer ring 72 in this order from the top. The airbag module 11 is fixed to the seat pan 22 by being screwed onto the nut 73. At this time, by tightening the bolt 70 and the nut 73, the seal rings 71 on both sides are crushed and seal the gap between the mounting holes 56, 26 on both sides and the bolt 70.

  As shown in FIG. 2, the cushion pad 23 is attached so as to cover the seat pan 22 to which the airbag module 11 is attached in this way from the upper side. The recessed portion for accommodating the protruding portion of the airbag module 11 from the seat pan 22, that is, the cover body 33, in a state where the peripheral portion 75 of the airbag module 11 is in contact with the peripheral portion 76 outside the airbag module 11 of the seat pan 22. 77 is formed.

  In the airbag module 11 described above, the inflator 44 is ignited when the deployment condition such as, for example, a gravitational acceleration exceeding a predetermined value is detected at the time of a vehicle collision, and the airbag body 42 in the folded state is The generated gas expands upward as indicated by a two-dot chain line in FIG. 2 and presses the cushion pad 23 upward. Then, the intermediate 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 side. Forward movement will be restricted. Note that the airbag main body 42 is inflated while being pushed open to the outside by breaking the cover body 33 from the tear lines 57 and 58 and bending the cover body 33 at the respective bending lines 59 and 60 during the above-described expansion.

  According to the embodiment described above, the entire peripheral edge portion 51 of the top plate portion 52 of the cover body 33 that closes the opening portion 30 of the upper portion of the case 31 that houses the airbag 32 constitutes the opening edge portion of the case 31. The frame plate portion 53 of the edge portion that is placed on the flange portion 37 that extends outward from the flange portion 37 and that is positioned outside the flange portion 37 is bent downward. Therefore, the liquid that has passed through the cushion pad 23 of the seat cushion 15 is stopped by the frame plate portion 53 that is bent downward, and water intrusion into the gap between the case 31 and the cover body 33 is prevented. Therefore, it is possible to prevent the liquid that has passed through the cushion pad 23 of the seat cushion 15 from entering the airbag 32.

  Further, since the frame plate portion 53 bent below the entire peripheral edge portion of the cover body 33 is separated from the flange portion 37 of the case 31, it is possible to reliably prevent water from entering the gap between the case 31 and the cover body 33. To do. Therefore, the liquid that has passed through the cushion pad 23 of the seat cushion 15 can be more reliably prevented from being immersed in the airbag 32.

  In addition, since a seal member 49 is provided for sealing a gap between the wiring W led out from the insertion hole 41 of the case 31 and the insertion hole 41, the insertion can be a moisture passage hole due to steam or humidity from below. The hole 41 can be closed.

  Further, the gaps between the mounting holes 55 and 38 on both sides necessary for fixing the cover body 33 to the case 31 and the bolts 65 are sealed by tightening the bolts 65 and nuts 68 to crush the seal rings 66 on both sides. In addition, the gaps between the mounting holes 56 and 26 on both sides necessary for fixing the airbag module 11 to the seat pan 22 and the bolts 70 are tightened by tightening the bolts 70 and nuts 73 to seal the seal rings 71 on both sides. Therefore, it is possible to prevent water from entering the gap between the case 31 and the cover body 33 through these gaps. Therefore, the liquid that has passed through the cushion pad 23 of the seat cushion 15 can be more reliably prevented from being immersed in the airbag 32.

  Note that the frame plate portion 53 for preventing the above-described flooding may be bent downward with respect to the top plate portion 52, and even if it is perpendicular to the top plate portion 52 as described above, it forms an obtuse angle. Or an acute angle. Furthermore, the angle with respect to the top plate part 52 may be partially different.

It is a disassembled perspective view which shows the seat to which the airbag apparatus of one Embodiment of this invention was applied. It is a sectional side view which shows the seat cushion of the seat to which the airbag apparatus of one Embodiment of this invention was applied. It is XX sectional drawing shown in FIG. 1 of the airbag apparatus of one Embodiment of this invention. It is a partial expanded sectional view which shows the principal part of the airbag apparatus of one Embodiment of this invention.

Explanation of symbols

11 Airbag module (airbag device)
15 Seat cushion 23 Cushion pad (pad)
31 Case 32 Airbag 33 Cover body 37 Flange (opening edge)
51 All peripheral edge (peripheral edge)
53 Frame plate (edge)

Claims (2)

An airbag device comprising a case provided below a pad of a vehicle seat cushion and having an upper opening, an airbag housed in the case, and a cover body that closes the upper opening of the case,
The peripheral edge of the cover body is placed on the opening edge of the upper part of the case and extends outward from the opening edge and is located outside the opening edge. An airbag device characterized in that the airbag device is bent downward. The airbag device according to claim 1, wherein the end edge portion is separated from the opening edge portion.

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