JP2007168584A - Vehicular hood air bag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load input amount from a high rigid member to a collision body when the high rigid member is provided on a hood lower surface side in a vehicular hood air bag device. <P>SOLUTION: A vertical wall part 28C of a front side reinforce 28 of a z shape vertical cross section used for fixing the vehicular hood air bag device 10 to the hood 14 is arranged in a range of an area S between a vertical wall 46A of an air bag case 46 and an end 60D at a vehicle front side of a deployed air bag 60, more preferably at a vehicle rear side than an arrow F, i.e., one of an application direction of collision load of the collision body. Thereby, the collision body does not directly receive reaction force from the vertical wall part 28C of the front side reinforce 28 and therefore, pedestrian protection performance when the collision body is a pedestrian can be enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle hood airbag device that is inflated and deployed on the upper surface side of a hood at the time of collision with a collision object.

  In Patent Document 1 below, an opening that is long in the hood width direction is formed at the rear end of the hood, the opening is covered with a cover (lid) that can be opened and closed, and an airbag case is disposed below the opening. A vehicle hood airbag device is disclosed in which an inflator and a folded airbag are housed in an airbag case.

According to the above configuration, when a frontal collision with a collision body such as a pedestrian occurs, the inflator is activated to generate gas, and the airbag is inflated. As a result, the cover is deployed outwardly of the hood, and the airbag is deployed on the upper side of the hood. As a result, it is intended to protect a collision object such as a pedestrian's head.
Japanese Patent No. 3245489

  However, according to the above prior art, a pair of front and rear hood inners (frame members) are disposed along the hood width direction on the lower surface side of the hood outer panel, and the longitudinal direction of the vehicle is the longitudinal direction between these hood inners. The structure is such that the stay is passed over and the airbag case (airbag module) is fixed to the stay. However, since the hood inner and the stay are both highly rigid members, the arrangement of these members is sufficient. It is necessary to consider.

  In view of the above facts, the present invention provides a vehicle hood airbag device capable of reducing the load input amount from the high-rigidity member to the collision body when a high-rigidity member is provided on the lower surface of the hood. Is the purpose.

  According to a first aspect of the present invention, there is provided a vehicular hood airbag device that is disposed on a lower side of a cover that covers a bag bulge opening formed on the hood rear end side of the hood outer panel so as to be openable. Stored in a folded state between a gas generating means for ejecting gas at the time of collision with a collision body, and a hood outer panel and a hood inner panel spaced apart on the lower surface side of the hood outer panel, from the gas generating means The air bag is inflated upon supply of the generated gas, and is deployed between at least the hood outer panel and the hood inner panel by expanding the cover to the outside of the hood and inflating and deploying the hood on the hood. Reinforcing the fixing portion of the airbag module including the inflator and the airbag to the hood, and at least the hood A high-rigidity portion having high rigidity against a collision load from above is disposed in a region between an end portion on the vehicle front side of the airbag during storage and an end portion on the vehicle front side of the airbag during deployment. And a reinforcing member.

  According to a second aspect of the present invention, in the hood airbag device for a vehicle according to the first aspect, the high-rigidity portion of the reinforcing member is on the vehicle rear side by a predetermined distance from the vehicle front side end portion of the airbag during deployment. It is characterized by being arranged with an offset.

  According to a third aspect of the present invention, there is provided the vehicle hood airbag device according to the first or second aspect, wherein the reinforcing member has a vehicle width so as to follow an edge of the bag inflating opening on the vehicle front side. It is configured as a long member extending along the direction.

  According to a fourth aspect of the present invention, in the vehicle hood airbag device according to any one of the first to third aspects, the reinforcing member connects the hood outer panel and the hood inner panel in a height direction. The vertical wall portion is provided as a highly rigid portion, and the vertical wall portion has a height that reaches the vicinity of the lower surface of the hood outer panel and supports the fixing portion to the hood outer panel, and the fixed support portion. And a non-fixing support portion that does not support the fixing portion to the hood outer panel.

  According to a fifth aspect of the present invention, in the vehicle hood airbag device according to any one of the first to third aspects, a load from a collision body is provided at a predetermined position in the height direction of the reinforcing member. A weak portion for buckling deformation of an input portion of the load at the time of input is provided.

  According to a sixth aspect of the present invention, in the hood airbag apparatus for a vehicle according to the fourth aspect, the fixed support portion in the vertical wall portion is a fragile portion that buckles the fixed support portion when a load is input from a collision body. Is provided.

  According to the first aspect of the present invention, when a collision with a collision object such as a pedestrian occurs, gas is ejected by the gas generating means. For this reason, the airbag stored in a folded state between the hood outer panel and the hood inner panel is inflated to press the cover from the lower surface side, and deploys this outwardly from the hood. As a result, the bag inflation opening formed on the rear end side of the hood is opened, and the airbag is inflated and deployed at least on the hood. As a result, when the collision body such as a pedestrian is received by the inflated airbag, the collision energy at the time of the collision is absorbed and the reaction force received by the collision body such as the pedestrian can be reduced.

  Here, in the present invention, a reinforcing member that reinforces the fixing portion of the airbag module including the inflator and the airbag to the hood is disposed between the hood outer panel and the hood inner panel. Since the rigid portion is disposed in a region between the end portion on the vehicle front side of the airbag at the time of storage and the end portion on the vehicle front side of the airbag at the time of deployment, the protection area of the airbag developed by the collision body is reduced. If it collides within the range, it can be avoided that the colliding body directly contacts the highly rigid portion of the reinforcing member. More precisely, since the deployed airbag is interposed between the collision body and the high-rigidity portion of the reinforcing member, the collision body collides with or just above the high-rigidity portion of the reinforcement member. Even so, the collision energy of the collision object is absorbed by the airbag. Therefore, the collision body does not receive a large reaction force from the highly rigid portion of the reinforcing member.

  According to the second aspect of the present invention, since the high-rigidity portion of the reinforcing member is arranged to be offset to the vehicle rear side by a predetermined distance from the vehicle front end portion of the airbag during deployment, the collision body Even when the hood collides obliquely from above the hood, that is, when the colliding body collides so as to bite into the inside of the protection area by the air bag, it is avoided that the colliding body directly contacts the reinforcing portion of the reinforcing member. be able to.

  According to the third aspect of the present invention, the reinforcing member is configured as a long member extending along the vehicle width direction so as to follow the vehicle front side edge of the bag bulge opening. Therefore, the reinforcing effect by the reinforcing member can be obtained in substantially the entire region of the airbag in the vehicle width direction. Accordingly, it is possible to increase the support force against the reaction force when the airbag is inflated and deployed, and accordingly, the deployment shape of the airbag becomes as intended (deployment accuracy is improved).

  According to the fourth aspect of the present invention, the reinforcing member includes the vertical wall portion, and the vertical wall portion is a high-rigidity portion.

  Here, in the present invention, the vertical wall portion is provided with a fixed support portion and a non-fixed support portion, and the fixed support portion with a relatively high height supports the fixed portion to the hood outer panel, and the relative height is relatively high. Since the low non-fixed support portion does not support the portion fixed to the hood outer panel, a gap is formed between the non-fixed support portion and the hood outer panel. Therefore, this gap can be used as an energy absorption stroke of the hood outer panel. In other words, the hood outer panel is easily deformed when subjected to a collision load, as compared with a configuration in which the reinforcing member is fixed to the hood outer panel over the entire length in the longitudinal direction.

  According to the fifth aspect of the present invention, since the weak portion for buckling deformation of the load input portion at the time of load input from the collision body is provided at a predetermined position in the height direction of the reinforcing member, The energy absorption effect due to the buckling deformation of the peripheral portion can be obtained, and at the same time, the load reaction force on the collision object is reduced.

  According to the sixth aspect of the present invention, since the weak support portion for buckling the fixed support portion when a load is input from the collision body is provided in the fixed support portion of the vertical wall portion, the vertical wall portion having high rigidity is fixed. It is possible to reduce the load reaction force input from the support portion to the collision body.

  As described above, the vehicle hood airbag device according to claim 1 is a reinforcing member that reinforces the fixing portion of the airbag module including the inflator and the airbag to the hood between the hood outer panel and the hood inner panel. Since the high rigidity portion provided in the reinforcing member is arranged in a region between the end portion on the vehicle front side of the airbag at the time of storage and the end portion on the vehicle front side of the airbag at the time of deployment, In the case where a high-rigidity member is provided on the lower surface side of the hood, the load input amount from the high-rigidity member to the collision body can be reduced.

  In the vehicle hood airbag device according to the second aspect of the present invention, the high-rigidity portion of the reinforcing member is disposed offset to the vehicle rear side by a predetermined distance from the vehicle front side end portion of the airbag during deployment. Therefore, it has the outstanding effect that the effective range which can reduce the load input amount to a collision body can be expanded.

  According to a third aspect of the present invention, there is provided a vehicular hood airbag device having an elongated shape that extends along the vehicle width direction so that the reinforcing member extends along the front edge of the bag inflating opening. Since it was comprised as a member, the deployment shape of an airbag will become a target, As a result, it has the outstanding effect that the pedestrian protection performance when a collision body is a pedestrian can be improved.

  According to a fourth aspect of the present invention, there is provided the vehicle hood airbag device, wherein the reinforcing member includes a vertical wall portion as a high-rigidity portion whose height direction is a direction connecting the hood outer panel and the hood inner panel, and the hood outer panel. And a non-fixed support portion that is lower than the fixed support portion and does not support the fixed portion to the hood outer panel. Since the vertical wall portion is configured to include, pedestrian protection performance when the collision body is a pedestrian can be improved.

  The vehicle hood airbag device according to the present invention described in claim 5 has an excellent effect that the pedestrian protection performance can be further improved when the collision body is a pedestrian.

  The vehicle hood airbag device according to the present invention described in claim 6 has an excellent effect that the pedestrian protection performance when the collision body is a pedestrian can be further enhanced.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle hood airbag device according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 2 is a perspective view showing the appearance of the vehicle 12 on which the vehicle hood airbag device 10 according to this embodiment is mounted. As shown in this figure, the vehicle hood airbag device 10 is disposed along the vehicle width direction on the rear end side of the hood 14 that opens and closes the engine room 72 (see FIG. 1).

  FIG. 1 shows a longitudinal sectional view of a state in which the vehicle hood airbag device 10 in the assembled state is cut along the vehicle longitudinal direction from the side. As shown in this figure, the hood 14 includes a hood outer panel 16 that constitutes a hood outer plate and a design surface of the hood 14. A substantially rectangular bag bulging opening 18 is formed in a substantially central portion on the rear end side of the hood outer panel 16 in a plan view with the vehicle width direction as the long side direction.

  On the back side of the hood outer panel 16, a hood inner panel 20 constituting an inner plate of the hood is disposed at a position separated from the hood outer panel 16 by a predetermined distance on the vehicle lower side. A hood inner side opening 26 having the same shape as the bag bulging opening 18 is formed in the hood inner panel 20 at a position facing the bag bulging opening 18. The airbag module 22 of the vehicle hood airbag device 10 is disposed by using the hood inner side opening 26.

  The airbag module 22 includes a high-strength lower plate 24 that closes the hood inner side opening 26 from below. The lower plate 24 is formed to be slightly larger than the hood inner side opening 26 in plan view, and is disposed in contact with the hood inner side opening 26 from the vehicle lower side, whereby the hood inner side opening 26. Is blocked.

  On the front edge side of the hood inner side opening 26 in the hood inner panel 20, a lower end portion 28 </ b> A of a front reinforcement 28 as a reinforcing member formed in a substantially Z shape in a side view is disposed in contact with the lower plate 24. Together with the front end 24A, the hood inner panel 20 is fastened together with bolts 30 and nuts 32. Similarly, a lower end portion 34 </ b> A of a rear reinforcement 34 formed in a substantially Z shape in a side view is disposed in contact with the rear edge side of the hood inner side opening 26 in the hood inner panel 20. The bolt 30 and the nut 32 together with the rear end 24B are fastened to the hood inner panel 20 together. The upper end portion 28B of the front reinforcement 28 and the upper end portion 34B of the rear reinforcement 34 are fixed to the back surface of the hood outer panel 16 by fixing means such as an adhesive (mastic) 36.

  The front side reinforcement 28 and the rear side reinforcement 34 reinforce the rigidity reduction due to the formation of the hood inner side opening 26 in the hood inner panel 20, and the airbag module 22 is connected to the hood outer panel 16 and the hood inner panel 20. It installs in order to fix to the closed space of the hood 14 which consists of.

  The portion of the lower plate 24 facing the hood inner side opening 26 has a shape that is slightly recessed toward the vehicle lower side, and the upper side is opened to the slightly recessed portion so that the front wall 46A and the rear wall 46B are formed. A substantially box-shaped airbag case 46 provided is attached.

  In the airbag case 46, an inflator 58 as a gas generating means formed in a substantially columnar shape is disposed with the vehicle width direction as a longitudinal direction, and an airbag 60 folded by a predetermined folding method is accommodated. ing. Precisely, the inflator 58 is fixed to the airbag case 46 and the lower plate 24 while being accommodated in the folded airbag 60.

  As the inflator 58, either a mechanical ignition type or an electric ignition type may be used, and either a gas generating agent enclosure type or a high pressure gas enclosure type can be applied. A plurality of gas ejection holes are formed in the circumferential direction of the inflator 58 at predetermined positions on the peripheral wall portion of the inflator 58.

  Further, as shown by a two-dot chain line in FIG. 2, the inflated and deployed airbag 60 is flattened in the vehicle width direction so as to cover the rear end of the hood, the cowl, the lower end of the windshield glass 64, and the like. A portion 60A and an extension portion 60B that communicates with the main body portion 60A and extends from both sides of the main body portion 60A along the front pillar 66 and covers the lower portion of the front pillar 66 are provided.

  The opening side end portion of the airbag case 46, that is, the bag inflation opening 18 is closed so as to be opened by a metal airbag door 48 as a cover. Specifically, the bag inflating opening 18 is formed in a step shape that is stepped downward from the general surface 16A of the hood outer panel 16 to the vehicle lower side, and the airbag door 48 has a thickness that can be accommodated in the step 50. And is formed in a size. A deployment hinge portion 48B formed in a substantially bow shape including the rear end portion 48A is integrally formed at the rear end portion 48A of the airbag door 48. The deployment hinge portions 48B are provided at predetermined intervals in the width direction of the airbag door 48. Correspondingly, a bracket 52 is fixed at a position facing the deployment hinge portion 48B in the rear reinforcement 34 described above, and a lower end portion 48B1 of the deployment hinge portion 48B is secured to the bracket 52 by a bolt 54 and a nut 56. It is fixed. Therefore, when the front door collides, the airbag door 48 plastically deforms the hinge intermediate portion 48B2 that forms a U-shape opposite to the front and rear of the deployment hinge portion 48B with the fastening point of the bolt 54 and the nut 56 as the deployment center due to the bag inflation pressure. While being deformed, it is configured to be opened to the vehicle rear side in a single-open manner.

  Here, the front reinforcement 28 as the reinforcing member has a substantially Z-shaped longitudinal section as described above, and is manufactured by press molding. The front reinforcement 28 includes a vertical wall portion 28C as a highly rigid portion extending substantially along the vehicle vertical direction between the lower end portion 28A and the upper end portion 28B. This vertical wall portion 28 </ b> C is a high-rigidity portion that is highly rigid with respect to a collision load from the obliquely upper side of the hood 14 (the load acting direction of the collision load is indicated by an arrow F in FIG. 1). Therefore, in the present embodiment, the vertical wall portion 28C is used as an end portion 60C on the vehicle front side of the airbag 60 at the time of storage (exactly the position in the front-rear direction of the end portion 60C on the vehicle front side of the folded airbag 60). The front wall 46A of the airbag case 46 that defines the vehicle and the end 60D of the airbag 60 at the front side of the airbag 60 at the time of deployment are arranged in a region S in the vehicle front-rear direction. There is a big feature of the form.

  Supplementally, in the region S, if the hood outer panel 16 is regarded as a flat surface, the vertical line s1 passing through the front surface of the front wall 46A of the airbag case 46 and the end portion of the main body 60A of the deployed airbag 60 on the vehicle front side. This indicates an area in the vehicle front-rear direction defined by a perpendicular line s2 passing through 60D. When the colliding body collides from directly above the hood outer panel 16, it means that the vertical wall portion 28C of the front reinforcement 28 may be disposed in the region S between the perpendicular line s1 and the perpendicular line s2. is there. This region S forms a part of the protection area by the airbag 60.

  On the other hand, the action direction F of the collision load of the collision object is not a vertical line standing on the hood outer panel 16 but points to a predetermined inclination direction inclined forward from the vertical line. It means the direction of biting (direction in which the area S erodes toward the vehicle rear side). This is because the collision direction of the actual collision object often collides from a direction inclined by a predetermined angle. Accordingly, when the action direction F of the collision load of the collision body is used as a reference, the vertical wall portion 28C of the front reinforcement 28 exists in a region surrounded by the action direction F of the collision load and the front wall 46A of the airbag case 46. It means that you have to. It should be noted that how many times the direction of action of the collision load is determined is arbitrarily determined. In short, when a certain inclination angle is determined, a highly rigid portion (vertical wall portion) of the front reinforcement 28 is located in a region on the vehicle rear side with respect to the inclination direction and on the vehicle front side with respect to the front wall 46A of the airbag case 46. 28C) is important.

(Action / Effect)
Next, the operation and effect of this embodiment will be described.

  When a frontal collision with a collision object such as a pedestrian occurs, the inflator 58 is activated and gas is ejected from the plurality of gas ejection holes. For this reason, the airbag 60 stored in the airbag case 46 in a folded state is inflated, and the airbag door 48 is pressed from the lower surface side. When the bag inflation pressure acting on the airbag door 48 reaches a predetermined position, the airbag door 48 is deployed toward the hood outward side (windshield glass 64 side) around the deployment hinge portion 48B. As a result, the bag inflation opening 18 formed on the rear end side of the hood is opened, and the airbag 60 is inflated and deployed as shown by a two-dot chain line in FIG. As a result, a collision force such as a pedestrian is received by the body portion 60A or the extension portion 60B of the inflated airbag 60, so that a collision energy such as a pedestrian is absorbed by the collision energy at the time of a frontal collision. Can be lowered.

  Here, in the present embodiment, a front reinforcement 28 and a rear reinforcement 34 that reinforce the fixing portion of the airbag module 22 to the hood 14 are disposed between the hood outer panel 16 and the hood inner panel 20. Since the vertical wall portion 28C of the front reinforcement 28 is disposed in the region S between the front wall 46A of the airbag case 46 and the end portion 60C on the vehicle front side of the airbag 60 at the time of deployment, the collision body is deployed. If it collides within the range of the protection area by the airbag 66, it can be avoided that the collision body directly contacts the vertical wall portion 28C of the front reinforcement 28. More precisely, since the deployed airbag 60 is interposed between the collision body and the vertical wall portion 28C of the front reinforcement 28, the collision body is temporarily above the vertical wall portion 28C of the front reinforcement 28. Or even if it collides with the vicinity, the collision energy which a collision body has is absorbed by the airbag 60. FIG. Therefore, the collision body does not receive a large reaction force from the vertical wall portion 28 </ b> C of the front reinforcement 28. As a result, according to the present embodiment, when a highly rigid member is provided on the lower surface side of the hood outer panel 16, the load input amount from the highly rigid member to the collision body can be reduced.

  Note that the rear reinforcement 34 is completely covered by the main body 60A of the airbag 60 in plan view, and thus it is not necessary to consider the above.

  Further, in the present embodiment, the vertical wall portion 28C of the front reinforcement 28 is arranged to be offset to the vehicle rear side by a predetermined distance from the vehicle front side end portion 60D of the airbag 60 at the time of deployment. Is collided from diagonally above the hood outer panel 16 (for example, in the direction of arrow F in FIG. 1), that is, when the colliding body collides so as to bite into the inside of the protection area by the airbag 60, Direct contact with the vertical wall portion 28C of the reinforcement 28 can be avoided. As a result, according to this embodiment, the effective range in which the load input amount to the collision object can be reduced can be expanded.

  Further, in the present embodiment, the front side reinforcement 28 (and the rear side reinforcement 34) is a long member extending along the vehicle width direction along the vehicle front side edge of the bag bulging opening 18. Since it is comprised, the reinforcement effect by the front side reinforcement 28 (and the rear side reinforcement 34) is acquired in the substantially whole area with respect to the vehicle width direction of the airbag 60. FIG. Therefore, it is possible to increase the support force against the reaction force when the airbag 60 is inflated and deployed, and accordingly, the deployed shape of the airbag 60 becomes as intended (deployment accuracy is improved). As a result, according to the present embodiment, the pedestrian protection performance when the collision body is a pedestrian can be enhanced as compared with the case where the airbag deployment shape varies.

[Second Embodiment]
Hereinafter, the second embodiment of the vehicle hood airbag device according to 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.

  FIG. 4 is a perspective view of the front reinforcement 80 according to the main part of the vehicle hood airbag device 10 according to the present embodiment. As shown in this figure, in the second embodiment, recesses 82 are formed at predetermined intervals on the upper part of the front reinforcement 80, and as a result, the protrusions as a fixed support portion having an isosceles trapezoid shape as a whole. 84 and concave portions 82 as non-fixed support portions having an inverted isosceles trapezoidal shape are alternately formed. The front reinforcement 80 also has a Z-shaped vertical cross-section similar to the front reinforcement 28 described above, and includes a lower end 80A, an upper end 80B, and a vertical wall 80C.

  The convex portion 84 is higher than the concave portion 82, and corresponds to the upper end portion 80B ("fixed portion to the hood outer panel") located at the upper end of the convex portion 84 when the front reinforcement 80 is assembled to the hood inner panel 20. ) Has a height that is close to the lower surface of the hood outer panel 16. The upper end portion 80B is bonded to the back surface of the hood outer panel 16 with an adhesive (mastic) 36, and the upper end portion 80B is supported by the convex portion 84. In this state, a gap 86 having a predetermined height is formed between the lower surface of the hood outer panel 16 and the bottom portion 82 </ b> A of the recess 82.

(Action / Effect)
According to the above configuration, the convex portions 84 and the concave portions 82 are alternately formed on the upper portion of the front reinforcement 80, and the upper end portion 80B located at the upper end of the convex portion 84 is fixed to the back surface of the hood outer panel 16 with the adhesive 36. Since the recess 82 is spaced apart from the back surface of the hood outer panel 16 in the recess 82, when the collision body collides from above the hood, the airbag 60 can absorb the collision energy of the collision body, At the position where the recess 82 is formed, the outer panel 16 can be deformed in a direction in which the gap 86 is crushed. That is, the gap 86 can be used as an energy absorption stroke (stroke) of the hood outer panel 16. Therefore, the pedestrian protection performance when the collision body is a pedestrian can be enhanced.

[Third Embodiment]
Hereinafter, a third embodiment of the vehicle hood airbag device according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above and 2nd Embodiment, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 5 shows a perspective view of the front reinforcement 90 according to the main part of the vehicle hood airbag device 10 according to the present embodiment. As shown in this figure, in the third embodiment, the shape of the front reinforcement 80 of the second embodiment is followed as it is, and a substantially rectangular opening 92 as a fragile portion is further formed in the center of the convex portion 84. Is formed. The opening 92 is formed only at the position where the convex portion 84 is formed, and is not formed at the position where the concave portion 82 is formed.

  The front reinforcement 90 also has a Z-shaped vertical cross-section, similar to the front reinforcement 80 described above, and includes a lower end 90A, an upper end 90B, and a vertical wall 90C.

(Action / Effect)
According to the above configuration, when the collision body collides from the upper side of the hood, the airbag 60 can absorb the collision energy of the collision body, and the opening 92 is formed to make it weak (low rigidity). ), The buckling deformation is positively generated and the energy is absorbed. Further, at the position where the recess 82 is formed, the outer panel 16 can be deformed in a direction in which the gap 86 is crushed. Therefore, the energy absorption stroke of the hood outer panel 16 can be substantially ensured over the entire area of the front reinforcement 90 in the longitudinal direction. As a result, according to this embodiment, the pedestrian protection performance when the collision body is a pedestrian can be enhanced.

[Fourth Embodiment]
Hereinafter, the fourth embodiment of the vehicle hood airbag device according to 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.

  FIG. 6 shows a longitudinal sectional structure of the vehicle hood airbag device 10. This embodiment is characterized in that both end portions in the longitudinal direction (both end portions in the vehicle width direction) of the front side reinforcement 28 in the first embodiment described above extend toward the vehicle front side.

  Specifically, in the front-side reinforcements 28, 80, 90 of the above-described embodiments, the vertical wall portions 28C, 80C, 90C, which are high-rigidity portions, are all affected by the collision load of the collision body over the entire length in the longitudinal direction. However, in this embodiment, both ends in the longitudinal direction extend beyond the arrow F and the region S to the front side of the vehicle. The upper end extension 28D is fixed (spot welded) to a hood component such as a long hood inner reinforcement 94 extending along the hood front-rear direction.

(Action / Effect)
Also with the above configuration, the same operations and effects as those of the first embodiment described above can be obtained. Moreover, if this structure is applied to 2nd Embodiment and 3rd Embodiment, the effect | action and effect demonstrated in 2nd Embodiment and 3rd Embodiment will be acquired.

  In addition, in this embodiment, the longitudinal intermediate portion of the front reinforcement 28 is fixed to the hood 14 at two points of the lower end 28A and the upper end 28B, whereas both longitudinal ends of the front reinforcement 28 are Since it is fixed to the hood 14 at the three points of the lower end portion 28A, the upper end portion 28B, and the upper end extension portion 28D, the torsional rigidity around the vehicle width direction of the front side reinforcement 28, which is a long member, can be increased. There is an advantage that the support rigidity of the outer panel 16 can be improved. As a result, according to the present embodiment, when the collision object is a pedestrian, the pedestrian protection performance is improved and the support rigidity of the hood outer panel 16 is improved (as a result, an occupant or the like places his / her hand on the hood outer panel 16). (Prevents stickiness from time to time).

[Supplementary explanation of this embodiment]
In the first to third embodiments described above, the entire front reinforcements 28, 80, and 90 are disposed on the vehicle rear side with respect to the direction of action F of the collision load of the collision body. It is only necessary that the high-rigidity portion having a high rigidity with respect to the vehicle is present in the region S in the vehicle rear side with respect to the action direction F of the collision load. Therefore, the present invention includes a configuration in which both end portions 28D in the longitudinal direction are present on the vehicle front side with respect to the region S and the action direction F of the collision load as in the front side reinforcement 28 of the fourth embodiment.

  In addition to the configuration in which the opening 92 is formed, various configurations can be adopted as the fragile portion. For example, a method of reducing the plate thickness of the portion where the opening 92 is formed, or a recess recessed in the plate thickness direction (vehicle longitudinal direction) in the vicinity of the intermediate portion in the height direction of the vertical wall portion 28C extends over the entire length of the vertical wall portion 28C. You may take the structure to provide. In this case, when a collision load is input, the thin-walled portion or the concave portion becomes the deformation starting point of the vertical wall portion 28C, and acts as a weak portion.

It is the longitudinal cross-sectional view (1-1 line sectional drawing of FIG. 2) which looked at the state which cut | disconnected the vehicle hood airbag apparatus of the assembly | attachment state along the vehicle front-back direction. It is a perspective view which shows the external appearance of the vehicle by which the hood airbag apparatus for vehicles shown by FIG. 1 is mounted including the state which the airbag expand | deployed. It is a whole perspective view of the front side reinforcement shown by FIG. It is a whole perspective view of the front side reinforcement which concerns on 2nd Embodiment. It is a whole perspective view of the front side reinforcement which concerns on 3rd Embodiment. It is the longitudinal cross-sectional view (longitudinal sectional view corresponding to FIG. 1) which looked at the state which cut | disconnected the hood airbag apparatus for vehicles which concerns on 4th Embodiment along the vehicle front-back direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle hood airbag apparatus 12 Vehicle 14 Hood 16 Hood outer panel 18 Opening part for bag expansion 20 Hood inner panel 22 Air bag module 28 Front side reinforcement (reinforcing member)
28C Vertical wall (high rigidity part)
30 Bolt 32 Nut 36 Adhesive 48 Airbag door (cover)
58 Inflator (gas generating means)
60 Airbag 60C End portion on the vehicle front side (end portion on the vehicle front side of the airbag when stored)
60D End portion on the vehicle front side (end portion on the vehicle front side of the airbag during deployment)
80 Front reinforcement (reinforcing member)
80C vertical wall (high rigidity part)
82 Concavity (non-fixed support)
84 Convex (fixed support)
90 Front reinforcement (reinforcing member)
90C vertical wall (high rigidity part)
92 Opening (fragile part)

Claims (6)

A cover for releasably opening a bag bulging opening formed on the hood rear end side of the hood outer panel;
A gas generating means disposed on the lower side of the cover and ejecting a gas upon collision with a collision body;
The hood outer panel is stored in a folded state between the hood outer panel and a hood inner panel spaced apart on the lower surface side of the hood outer panel. The hood outer panel is expanded by receiving the supply of gas generated from the gas generating means. An airbag that is expanded toward and expanded at least on the hood,
It is arranged between the hood outer panel and the hood inner panel and reinforces the fixing part to the hood of the airbag module including the inflator and the airbag, and at least against a collision load from above the hood. A high rigidity portion having a high rigidity, a reinforcing member disposed in a region between an end portion on the vehicle front side of the airbag at the time of storage and an end portion on the vehicle front side of the airbag at the time of deployment;
A vehicle hood airbag device comprising: The high-rigidity portion of the reinforcing member is arranged to be offset toward the vehicle rear side by a predetermined distance from the end portion of the airbag on the vehicle front side during deployment.
The vehicle hood airbag device according to claim 1. The reinforcing member is configured as a long member extending along the vehicle width direction so as to follow the vehicle front side edge of the bag bulge opening.
The vehicle hood airbag device according to claim 1 or 2, wherein the vehicle hood airbag device is characterized. The reinforcing member includes a vertical wall portion as a high-rigidity portion whose height direction is a direction connecting the hood outer panel and the hood inner panel,
The vertical wall portion has a height that reaches the vicinity of the lower surface of the hood outer panel, and a fixing support portion that supports a fixing portion to the hood outer panel, a height that is lower than the fixing support portion, and a fixing portion to the hood outer panel. A non-fixing support portion that does not support,
The hood airbag apparatus for vehicles according to any one of claims 1 to 3 characterized by things. At a predetermined position in the height direction of the reinforcing member, a weakened portion is provided for buckling deformation of an input portion of the load when a load is input from the collision body.
The hood airbag apparatus for vehicles according to any one of claims 1 to 3 characterized by things. The fixed support portion in the vertical wall portion is provided with a fragile portion that buckles the fixed support portion when a load is input from the collision body.
The vehicle hood airbag device according to claim 4.

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