JP6561807B2 - Hood structure with pedestrian protection airbag - Google Patents

Description

  The present invention relates to a hood structure equipped with a pedestrian protection airbag.

  Patent Document 1 below discloses a pedestrian airbag device. In this pedestrian airbag device, a hood airbag module in which an airbag and an inflator are housed in a case is attached to the back side near the rear end of the hood.

Japanese Patent Laying-Open No. 2015-85867

  According to the configuration disclosed in Patent Document 1, the inflator housed in the case of the hood airbag module is disposed in proximity to the hood. Therefore, when a collision object such as a pedestrian collides with the vicinity of the hood airbag module in the hood at the time of a pedestrian collision, the collision load received by the collision object by the inflator in the case may increase. The above prior art has room for improvement.

  In view of the above problems, an object of the present invention is to obtain a hood structure equipped with a pedestrian protection airbag capable of reducing a collision load on a collision body that collides with the hood.

A hood structure equipped with a pedestrian protection airbag according to the first aspect of the present invention includes a hood outer panel, and a hood inner that is disposed on the vehicle lower side with respect to the hood outer panel and forms a closed cross section with the hood outer panel. A hood configured to include a panel, a hood airbag module in which an airbag and an inflator are housed inside the case, and a hood airbag module that is disposed on the vehicle lower side of the closed section, and inside the closed section And at least a part of the inflator is disposed on the vehicle upper side, and includes a pair of inclined wall portions and a reinforcement bottom wall portion connecting lower end portions of the inclined wall portions in the vehicle front-rear direction, and the phosphorus the bolt for fastening the hood airbag module with is inserted into the force the bottom wall portion, a collision input from the vehicle upper side It has a dent reinforcement to absorb the heavy, the.

According to the first aspect of the present invention, the dent reinforcement is provided inside the closed section formed by the hood inner panel and the hood outer panel. At least a part of the dent reinforcement is disposed on the vehicle upper side of the inflator. When a collision object collides with the vicinity of the hood airbag module in the hood from above the hood at the time of pedestrian collision, not only the hood but also the dent reinforcement inside the closed cross section is deformed. Therefore, the collision energy is absorbed by the deformation of the dent reinforcement. For this reason, the collision load which the collision body receives by colliding with the inflator in the hood airbag module arrange | positioned at the vehicle downward side of a closed cross-section part is reduced. The hood structure equipped with the pedestrian protection airbag according to the invention described in claim 2 is the hood structure according to claim 1, wherein the inclined wall portion on the vehicle rear side of the pair of inclined wall portions is provided on the dent reinforcement. When a collision load transmitted from a substantially vehicle upper side to a substantially vehicle lower side is input, at least a part of the vehicle is moved forward in the vehicle front-rear direction. The hood structure equipped with the pedestrian protection airbag according to the invention described in claim 3 is the hood structure according to claim 2, wherein the inclined wall portion on the vehicle front side of the pair of inclined wall portions is provided on the dent reinforcement. When a collision load transmitted from a substantially vehicle upper side to a substantially vehicle lower side is input, at least a part of the vehicle is moved rearward in the vehicle front-rear direction.

  The hood structure equipped with the pedestrian protection airbag according to the first aspect of the present invention has an excellent effect that it is possible to reduce a collision load on a collision body that collides with the hood.

It is a disassembled perspective view which shows the hood structure which mounts the pedestrian protection airbag which concerns on 1st Embodiment. It is an expanded sectional view which shows the state cut | disconnected along the AA line of FIG. It is a schematic perspective view which shows the dent reinforcement in the hood structure which mounts the pedestrian protection airbag which concerns on 1st Embodiment. It is an expanded sectional view which shows the state which looked at the principal part of the hood structure carrying the pedestrian protection airbag which concerns on 2nd Embodiment from the vehicle side surface.

(First embodiment)
Hereinafter, a first embodiment of a hood structure equipped with a pedestrian protection airbag according to the present invention will be described with reference to FIGS. In these figures, the arrow FR indicates the front side in the vehicle longitudinal direction, the arrow OUT indicates the vehicle width direction outside, and the arrow UP indicates the vehicle vertical direction upper side.

  As shown in FIG. 1, a hood 10 is provided on the vehicle upper side of a power unit room of a vehicle (not shown), and a hood airbag module 12 is attached to the back side of the vehicle rear end portion 11 of the hood 10. It has been.

  As shown in FIG. 2, the hood 10 includes a hood outer panel 14 that constitutes a part of the design surface of the vehicle, and a vehicle width direction that is attached to the vehicle lower side surface of the hood outer panel 14 and reinforces the hood outer panel 14. And a hood inner panel 16 extended. The hood inner panel 16 has a substantially hat shape in which a cross-sectional shape in a vehicle side view is opened to the vehicle upper side by a vehicle front side flange 18, a bottom wall portion 20, and a vehicle rear side flange 22. The vehicle front side flange 18 and the vehicle rear side flange 22 of the hood inner panel 16 are substantially parallel to the hood outer panel 14, and the vehicle front side flange 18 is joined to the vehicle lower side surface of the hood outer panel 14 by a sealer (not shown). Has been. Further, the vehicle rear side flange 22 and the rear edge 24 of the hood outer panel 14 are joined by hemming. Therefore, a closed cross section 15 is formed by the hood outer panel 14 and the hood inner panel 16.

  A mounting hole 26 penetrating in the plate thickness direction is formed in the vehicle rear side flange 22 of the hood inner panel 16. A mounting claw 28 of the hood airbag module 12 described later is inserted into the mounting hole 26. A through hole 30 is formed in the bottom wall portion 20 of the hood inner panel 16 so as to penetrate in the plate thickness direction.

  A hood airbag module 12 is attached to the hood inner panel 16. The hood airbag module 12 is disposed on the vehicle lower side of the closed cross section 15. The hood airbag module 12 includes a case 32, a front fixing bracket 34 as a front fixing portion, a rear fixing bracket 36, an inflator 38 accommodated in the case 32, and an airbag 40. It is configured. The case 32 is formed in a long, substantially box shape whose longitudinal direction is the vehicle width direction.

  As shown in FIG. 1, the front side fixing bracket 34 includes a first front fixing bracket 42 and a second front fixing bracket 44. The first front fixing bracket 42 is formed in a substantially rectangular shape in plan view of the vehicle, and the cross-sectional shape along the vehicle vertical direction is formed in an inverted L shape with the upper side wall portion 46 and the side wall portion 48. . The first front fixing bracket 42 is fixed to the case 32 via a rear side fixing bracket 36 which will be described later provided at the approximate center of the case 32 in the case width direction.

  The second front fixing bracket 44 is formed in an L shape by a front-rear extending portion 50 and a vehicle width extending portion 52 in a vehicle plan view. On the other hand, like the first front fixing bracket 42, the cross-sectional shape along the vehicle vertical direction is formed in an inverted L shape with the upper side wall portion 47 and the side wall portion 49. The second front fixing brackets 44 are provided on both ends of the case 32 in the vehicle width direction, and the side wall portions 49 on the front and rear extension portions 50 side are fixed to the case 32 via the rear side fixing brackets 36. At the same time, the side wall 49 on the vehicle width extending portion 52 side is fixed to the lateral side wall 51 of the case 32. A through hole 53 is formed in the upper wall portion 46 of the first front fixing bracket 42 and the upper wall portion 47 of the second front fixing bracket 44 described above, and the bolt 54 is inserted therethrough. It is possible (see FIG. 2).

  A plurality of (three in the present embodiment) rear-side fixing brackets 36 are attached to the case 32 of the hood airbag module 12, and they are spaced apart from each other in the vehicle width direction. The rear side fixing bracket 36 is formed in a substantially rectangular shape in a vehicle plan view, and a cross-sectional shape along the vehicle vertical direction is formed in an inverted L shape between the upper side wall portion 56 and the side wall portion 58. 60 and an attachment claw 28 extending from the approximate center of the rear end portion 62 in the upper wall portion 56 of the base portion 60 to the vehicle rear side. The attachment claw 28 is inserted into an attachment hole 26 formed in the vehicle rear side flange 22 of the hood inner panel 16. Thereby, the vehicle rear side of the hood airbag module 12 is engaged with the hood inner panel 16.

  As shown in FIG. 2, a dent reinforcement 64 is provided between the hood inner panel 16 and the hood outer panel 14. The dent reinforcement 64 extends in the vehicle width direction as in the case of the hood inner panel 16, and has a sectional shape in a vehicle side view in the vehicle front side flange 66, the reinforcement bottom wall portion 68, and the vehicle rear side. The side flange 70 is a substantially hat shape that is open to the vehicle upper side. The vehicle front side flange 66 and the vehicle rear side flange 70 are coupled to the vehicle lower side surface of the hood inner panel 16 via a sealer 72. Further, the vehicle rear side flange 70 is disposed on the vehicle upper side of the inflator 38 of the hood airbag module 12.

  The reinforcement bottom wall portion 68 is formed with a mounting hole 74 penetrating in the thickness direction. The mounting hole 74 has a through hole 53 and a hood inner panel 16 in the front fixing bracket 34 of the hood airbag module 12. A bolt 54 inserted through the through hole 30 in the bottom wall portion 20 is inserted. The bolt 54 is fastened to a nut 76 disposed on the vehicle upper side of the reinforcement bottom wall portion 68, whereby the front fixing bracket 34 and the vehicle front side of the hood airbag module 12 and the dent reinforcement 64 are thereby connected. Fastened to the hood inner panel 16.

  An inclined wall portion 78 is provided between the vehicle front side flange 66 and the reinforcement bottom wall portion 68 in the dent reinforcement 64. Specifically, the inclined wall portion 78 is directed toward the vehicle rear side so as to connect the end portion on the vehicle rear side of the vehicle front side flange 66 and the end portion on the vehicle front side of the reinforcement bottom wall portion 68. It is inclined and extended to the vehicle lower side. The inclined wall portion 78 is composed of an inclined wall upper portion 82 that constitutes the vehicle upper side portion and an inclined wall lower portion 84 (see FIG. 3) that constitutes the vehicle lower side portion. An inclined wall upper part 82 is extended at an angle closer to the horizontal direction with respect to the lower part 84. Therefore, a ridge line 86 is formed between the inclined wall upper part 82 and the inclined wall lower part 84 having different angles.

  As shown in FIG. 3, a slit 88 is formed in the inclined wall lower portion 84 of the inclined wall portion 78. The slit 88 is substantially U-shaped when viewed from the front of the vehicle by a pair of left and right vertical slits 88A extending from the ridgeline 86 toward the vehicle lower side and a horizontal slit 88B connecting the lower ends of the left and right vertical slits 88A. Is formed. By this slit 88, the inclined wall lower portion 84 inside the slit 88 is configured to be movable in the vehicle front-rear direction around the ridge line 86. The inclined wall lower portion 84 inside the slit 88 is referred to as a movable wall portion 92 in the following description.

  The movable wall portion 92 is disposed at a position corresponding to the attachment hole 74 formed in the reinforcement bottom wall portion 68, and is formed with the attachment hole 74 in a plurality and spaced from each other in the vehicle width direction. The movable wall portion 92 is located substantially on the same plane as the inclined wall lower portion 84 in the normal state.

  The inclined wall portion 78 described above is also provided between the vehicle rear side flange 70 and the reinforcement bottom wall portion 68 in the dent reinforcement 64. That is, the dent reinforcement 64 is formed symmetrically about the virtual line X along the vehicle vertical direction passing through the center of the reinforcement bottom wall 68 (see FIG. 2).

(Operation and effect of the first embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, as shown in FIG. 2, a dent reinforcement 64 is provided inside the closed cross section 15 formed by the hood inner panel 16 and the hood outer panel 14. At least a part of the dent reinforcement 64 is disposed on the vehicle upper side of the inflator 38. When a collision body 94 such as a pedestrian collides with the vicinity of the hood airbag module 12 in the hood 10 at the time of a pedestrian collision, not only the hood 10 but also the dent reinforcement 64 inside the closed section 15 is deformed. . Accordingly, the collision energy is absorbed by the deformation of the dentrin force 64. For this reason, the collision load which a collision body receives by colliding with the inflator 38 in the hood airbag module 12 arrange | positioned at the vehicle lower side of the closed cross-section part 15 is reduced. Thereby, the collision load to the collision body 94 which collides with the hood 10 can be reduced.

  A movable wall 92 is formed on the inclined wall 78 of the dent reinforcement 64. The movable wall portion 92 is inclined substantially on the same plane as the inclined wall lower portion 84 in a normal state, that is, toward the vehicle lower side as it goes toward the center of the reinforcement bottom wall portion 68 in a vehicle side view. Further, since the movable wall portion 92 is provided with the slit 88, the movable wall portion 92 can move independently of the inclined wall portion 78 around the ridgeline 86. Accordingly, when the collision body 94 collides with the hood 10 from the front of the vehicle at the time of a pedestrian collision, the collision load is transmitted from about the vehicle upper side to the vehicle lower side. To be compressed. By the way, the inclined wall upper part 82 is extended at an angle close to the horizontal direction with respect to the inclined wall lower part 84. For this reason, when the collision load is input, the inclined wall upper part 82 is deformed so that the dent line force 64 falls toward the vehicle front-rear direction outside with respect to the ridgeline 86. At this time, the movable wall portion 92 has a lower end opened by the slit 88 and is continuously formed with the inclined wall upper portion 82 via the ridge line 86, so that the ridge line 86 is moved together with the inclined wall upper portion 82 that falls down. It moves to the center of the Dentlin Force 64 in the longitudinal direction of the vehicle (two-dot chain line in the figure). Therefore, the movable wall portion 92 is disposed on the upper portion of the bolt 54 that attaches the hood airbag module 12 to the hood inner panel 16. That is, in the case of a pedestrian collision, since the movable wall portion 92 that is displaced as well as the hood outer panel 14 exists between the collision body 94 and the bolt 54, the collision body 94 is in direct contact with the bolt 54. It can be suppressed more. Thereby, the collision load to the collision body 94 that collides with the hood 10 can be further reduced.

(Second Embodiment)
Next, a hood structure equipped with a pedestrian protection airbag according to the second embodiment of the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 4, the dentrin force 96 according to the second embodiment has the same basic configuration as that of the first embodiment, except that a cut portion 100 is formed in the inclined wall portion 98. There are features.

  That is, the dent reinforcement 96 extends in the vehicle width direction like the hood inner panel 16, and has a cross-sectional shape in the vehicle side view, the vehicle front side flange 102, the reinforcement bottom wall 104, the vehicle The rear flange 106 is a substantially hat shape that is open to the vehicle upper side. The vehicle front side flange 102 and the vehicle rear side flange 106 are coupled to the vehicle lower side surface of the hood inner panel 16 via a sealer 72. The vehicle rear side flange 106 is disposed on the vehicle upper side of the inflator 38 of the hood airbag module 12.

  The reinforcement bottom wall 104 is formed with a mounting hole 108 penetrating in the plate thickness direction. The mounting hole 108 has a through hole 53 and a hood inner panel 16 in the front fixing bracket 34 of the hood airbag module 12. A bolt 54 inserted through the through hole 30 in the bottom wall portion 20 is inserted. The bolt 54 is fastened to a nut 76 disposed on the vehicle upper side of the reinforcement bottom wall portion 104, whereby the front fixing bracket 34 and the vehicle front side of the hood airbag module 12 and the dent reinforcement 96 are thereby connected. Fastened to the hood inner panel 16.

  An inclined wall portion 98 is provided between the vehicle front side flange 102 and the reinforcement bottom wall portion 104 in the dent reinforcement 96. Specifically, the inclined wall portion 98 is connected to the vehicle rear side so as to connect the vehicle rear side end portion of the vehicle front side flange 102 and the end portion of the reinforcement bottom wall portion 104 on the vehicle front side. It is inclined and extended downward. Further, a cut portion 100 is formed at a substantially central portion of the inclined wall portion 98 in the vehicle vertical direction. The cut portion 100 has a shape in which the outside of the inclined wall portion 98 is partially cut away, and is inclined around the cut portion 100 when a collision load is applied to the inclined wall portion 98 from substantially the upper side of the vehicle. The wall 98 is deformed (indicated by a two-dot chain line in the figure) toward the inside of the dent reinforcement 96 in the vehicle longitudinal direction.

  The inclined wall portion 98 described above is also provided between the vehicle rear side flange 106 and the reinforcement bottom wall portion 104 in the dent reinforcement 96. That is, the dent reinforcement 96 is formed symmetrically about the imaginary line X along the vehicle vertical direction passing through the center of the reinforcement bottom wall 104.

(Operation and effect of the second embodiment)
Next, the operation and effect of the second embodiment will be described.

  Also with the above configuration, except for the point that the notch 100 is formed in the dent reinforcement 96, it is configured similarly to the hood structure equipped with the pedestrian protection airbag of the first embodiment. Similar effects can be obtained. That is, at the time of a pedestrian collision, when the collision body 94 collides with the hood airbag module 12 near the hood 10 from above, the dent reinforcement 96 is deformed to absorb the collision load. Thereby, the collision load to the collision body 94 which collides with the hood 10 can be reduced.

  Further, a cut portion 100 is formed in the inclined wall portion 98 of the dent reinforcement 96. Therefore, when the collision body 94 collides with the hood 10 from the diagonally forward direction of the pedestrian, the collision load is transmitted from the upper side of the vehicle to the lower side of the vehicle, so that the dent reinforcement 96 is directed toward the lower side of the vehicle. To be compressed. At this time, since the notched portion 100 is formed in the inclined wall portion 98, the inclined wall portion 98 is deformed inward in the vehicle front-rear direction of the dent reinforcement 96 around the notched portion 100. The deformed inclined wall portion 98 is disposed on the upper portion of the bolt 54 that attaches the hood airbag module 12 to the hood inner panel 16. That is, in the case of a pedestrian collision, there is not only the hood outer panel 14 but also the inclined wall portion 98 displaced between the collision body 94 and the bolt 54, so that the collision body 94 directly contacts the bolt 54. It can be suppressed more. Thereby, the collision load to the collision body 94 that collides with the hood 10 can be further reduced.

  In addition, in 1st, 2nd embodiment mentioned above, although the cross-sectional shape in the vehicle side view of the dentlin force 64,96 is made into a substantially hat type, it is not restricted to this, Other shapes, such as a substantially rectangular shape, May be.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 Hood 12 Hood airbag module 14 Hood outer panel 15 Close cross section 16 Hood inner panel 32 Case 38 Inflator 40 Air bag 64 Dentorin force 96 Denton force

Claims (3)

A hood configured to include a hood outer panel, and a hood inner panel that is disposed on the vehicle lower side with respect to the hood outer panel and forms a closed cross section with the hood outer panel;
A hood airbag module that is disposed on the vehicle lower side of the closed cross section and in which an airbag and an inflator are housed inside the case;
A reinforcement bottom wall portion that is provided inside the closed cross-section portion and that is at least partially disposed on the vehicle upper side of the inflator and connects the pair of inclined wall portions and the lower end portions of the inclined wall portions in the vehicle longitudinal direction. And a bolt for fastening the hood airbag module to the bottom wall of the reinforcement, and a dent reinforcement for absorbing a collision load input from above the vehicle,
A hood structure equipped with a pedestrian protection airbag. Of the pair of inclined wall portions, at least a part of the inclined wall portion on the vehicle rear side when the collision load transmitted from the substantially upper vehicle side to the substantially lower vehicle side is input to the dent reinforcement. Move forward in the direction,
  A hood structure equipped with the pedestrian protection airbag according to claim 1. Among the pair of inclined wall portions, the inclined wall portion on the vehicle front side is at least partially front and rear when the collision load transmitted from the substantially upper vehicle side to the substantially lower vehicle side is input to the dent reinforcement. Move to the rear side,
  A hood structure equipped with the pedestrian protection airbag according to claim 2.