JP2007001408A - Hood structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent bottom ground-touching of a hood while weakening impact energy against a colliding body when the colliding body collides against a rear end part of the hood. <P>SOLUTION: It is possible to weaken the impact energy against the colliding body 36 and to prevent the bottom ground-touching of the of the hood 20 to a lower part by reducing deforming stroke of the hood as a reinforcing part 32 extending in the car widthwise direction on a vertical wall part 12A of a hood inner panel 12 positioned on the rear end side of the hood 20 at a closed position, a fragile part 30 is provided in the rear of the reinforcing part and a rear end reinforcing part 34 extending in the car widthwise direction is provided on a rear end part 20B of the hood positioned in the rear of the fragile part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hood structure for a vehicle, and more particularly to a hood structure for a vehicle that protects a collision body at the time of a collision in a vehicle such as an automobile.

As a conventional vehicle hood structure, when a collision object collides, the rear end side of the hood is flipped up, and a so-called lift-up hood is provided with reinforcements on the left and right along the hood inner panel at the rear end of the hood. There has been disclosed an apparatus that absorbs collision energy by improving the bending rigidity of the hood at the time of up and by allowing the reinforcing material to be detached when an impact force from the collision body acts (see Patent Document 1). ).
Japanese Patent Laid-Open No. 10-194159

  However, in the structure in which the reinforcing material attached to the hood inner panel is removed at the time of collision as in the conventional example described above, although the collision energy can be weakened, the deformation stroke amount of the hood after the reinforcing material is removed becomes large. Therefore, particularly in the case of a hood that does not lift up at the time of a collision, there is a problem that the hood inner panel is likely to bottom out against lower parts (for example, parts in the engine compartment or cowl).

  In view of the above-described facts, an object of the present invention is to prevent the bottom of the hood while weakening the collision energy against the collision body when the collision body collides with the rear end portion of the hood.

  The invention of claim 1 is characterized in that a reinforcing portion extending in the vehicle width direction is provided on the vertical wall portion of the hood inner panel located on the rear end side of the hood in the closed position.

  In the vehicle hood structure according to claim 1, since the reinforcing portion extending in the vehicle width direction is provided on the vertical wall portion of the hood inner panel located on the rear end side of the hood in the closed position, the collision body Even when a force in the surface direction (substantially in the vehicle vertical direction) acts on the vertical wall portion due to the collision, the buckling deformation hardly occurs in the vertical wall portion. Accordingly, since the deformation stroke of the hood is reduced, the bottom of the hood with respect to the lower part can be suppressed.

  Further, since the deformation stroke of the hood is suppressed, for example, when the colliding body collides from the front of the hood, the colliding body does not bite into the hood, and the colliding body is bounced back to the hood. (For example, windshield glass). For this reason, it is possible to convert a part of the collision energy of the collision body into kinetic energy, and thus the collision energy can be weakened.

  According to a second aspect of the present invention, in the hood structure for a vehicle according to the first aspect, the reinforcing portion is formed by fixing a reinforcing member extending in the vehicle width direction to the vertical wall portion.

  The vehicle hood structure according to claim 2 does not adopt a configuration in which the collision member is detached from the vertical wall portion and absorbs the collision energy at the time of collision, and adopts a configuration in which the reinforcing member is fixed to the vertical wall portion. For this reason, absorption of collision energy can be performed by conversion into kinetic energy, and deformation stroke suppression of the hood can be performed by reinforcing the vertical wall portion by the reinforcing member. That is, it is possible to achieve both absorption of collision energy and suppression of the deformation stroke of the hood.

  According to a third aspect of the present invention, in the vehicle hood structure according to the first or second aspect, a fragile portion is provided behind the reinforcing portion along the vehicle width direction.

  In the hood structure for a vehicle according to claim 3, since the fragile portion is provided along the vehicle width direction behind the reinforcing portion, when the colliding body collides with the rear end region of the hood, the hood Deform in A part of the collision energy can be absorbed by the deformation of the weak part.

  According to a fourth aspect of the present invention, in the hood structure for a vehicle according to the third aspect, a rear end reinforcing portion extending in the vehicle width direction is provided at the rear end portion of the hood located behind the fragile portion. It is characterized by.

  In the vehicle hood structure according to claim 4, since the rear end reinforcing portion extending in the vehicle width direction is provided at the rear end portion of the hood located behind the fragile portion, The portion that is easily deformed by the collision of the collision body is limited to the fragile portion. In other words, by predetermining as a weak portion the part that the collision object wants to deform at the time of collision, it is possible to stabilize the deformation position of the hood at the time of collision, and for each vehicle type, for example, absorption of collision energy against collision load It is easy to perform matching tuning.

  In addition, when the collision body collides with the rear end of the hood, the rear end is bent downward so that the collision body easily moves backward, and the ratio of energy converted from collision energy to kinetic energy is calculated. Can be increased.

  According to a fifth aspect of the present invention, in the hood structure for a vehicle according to the fourth aspect, the rear end reinforcing portion folds the rear end of the hood inner panel and overlaps the rear end of the hood outer panel outside the rear end. It is characterized by being folded and combined.

  In the vehicle hood structure according to claim 5, the rear end reinforcing portion is configured by folding back and joining the rear end of the hood inner panel so that the rear end of the hood outer panel overlaps the outside of the rear end. Therefore, the rear end portion of the hood can be reinforced at a low cost without increasing the number of parts.

  As described above, according to the hood structure for a vehicle according to claim 1 of the present invention, when the collision body collides with the rear end portion of the hood, the collision energy against the collision body is weakened and the bottom of the hood is attached. It is possible to obtain an excellent effect that can be prevented.

  According to the hood structure for a vehicle according to claim 2, by fixing the reinforcing member to the vertical wall portion, it is possible to achieve both the suppression of the deformation stroke of the hood and the prevention of the bottom of the hood. Is obtained.

  According to the hood structure for a vehicle according to claim 3, when the collision body collides with the rear end region of the hood, the hood is deformed in the fragile portion, so that a part of the collision energy can be absorbed. An excellent effect is obtained.

  According to the hood structure for a vehicle according to claim 4, the deformation position of the hood at the time of the collision can be stabilized by preliminarily determining the portion to be deformed at the time of the collision of the projecting body as the fragile portion. As for the absorption of the collision energy with respect to the vehicle, it becomes easy to perform tuning suitable for each vehicle type, and the excellent effect of further improving the protection performance against the collision body can be obtained.

  According to the vehicle hood structure of the fifth aspect, an excellent effect is obtained in that the rear end portion of the hood can be reinforced at a low cost without increasing the number of parts.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
In FIG. 1, a vehicle hood structure S <b> 1 according to the first embodiment is mainly composed of a hood outer panel 10 and a hood inner panel 12, for example, a front hood of a vehicle 14 that is attached to an engine compartment 16 of the vehicle 14 so as to be opened and closed. Regarding the hood 20, a cowl inner panel 18, a cowl top panel 24, a cowl top ventilator louver 26, a windshield glass 28, and the like are disposed on the rear side from the vicinity of the rear end 20 </ b> B of the hood 20.

  In the vehicle hood structure S1, the reinforcing portion 32 is formed in the vehicle width direction on the vertical wall portion 12A of the hood inner panel 12 positioned a predetermined distance forward from the rearmost end 20A of the hood 20 in the closed position. A fragile portion 30 is formed in the vehicle width direction behind the vehicle.

  As shown in FIG. 1, at the rear end portion 20B of the hood 20, the rear end 12B of the hood inner panel 12 is joined with the rear end 10B of the hood outer panel 10 without being folded back (the rear end 10B). Is folded back and joined so as to sandwich the rear end 12B). The hood inner panel 12 overlaps with the hood outer panel 10 from the rear end 12B to the vertical wall portion 12A, and a portion that is not folded back is the fragile portion 30. As means for increasing the fragility of the fragile portion 30, in addition to thinning the hood inner panel 12 and the hood outer panel 10 in the fragile portion 30, formation of a groove or a hole in the vehicle width direction can be considered.

  The hood inner panel 12 is provided with a vertical wall portion 12A standing in a direction away from the hood outer panel 10 at the front end of the fragile portion 30, and a bottom portion 12C is formed in front of the vehicle from the lower end of the vertical wall portion 12A. From the front end of 12C, a front vertical wall portion 12D is formed in a direction approaching the hood outer panel 10 again. The front from the upper edge of the front vertical wall portion 12D extends, for example, substantially parallel to the hood outer panel 10. That is, the vertical wall portion 12A, the bottom portion 12C, and the front vertical wall portion 12D that extend in the vehicle width direction each have a shape that bulges toward the engine compartment 16 side.

  A reinforcing member 38 extending in the vehicle width direction is fixed to, for example, the inner surface of the vertical wall portion 12A of the hood inner panel 12 by welding or bonding, and a force acts in the surface direction of the vertical wall portion 12A (substantially the vehicle vertical direction). Sometimes, the vertical wall portion 12A is unlikely to buckle. The reinforcing member 38 desirably covers the vertical wall portion 12A as widely as possible, and may extend to the bottom portion 12C without being limited to the vertical wall portion 12A.

As described above, the vehicle hood structure S1 includes the vertical wall portion 12A and the rear end portion 20B that are not easily deformed before and after the fragile portion 30, and the rear end portion 20B is easily bent at the fragile portion 30 as a boundary. ing.
(Function)
In FIG. 2, when the collision body 36 collides with the vehicle 14 having the vehicle hood structure S <b> 1 in the direction of the arrow A, for example, above the reinforcing portion 32 of the hood 20, the collision body 36 does not bite into the hood 20. For example, while moving in the direction of arrow R, it moves in the direction of arrow A. At this time, a part of the collision energy is absorbed by the vehicle hood structure S1.

  The collision energy absorption function will be described in more detail. In the vehicle hood structure S1, the fragile portion 30 is formed along the vehicle width direction at a position a predetermined distance ahead from the rearmost end 20A of the hood 20 in the closed position. Since the rear end portion 20B is easily deformed, a part of the collision energy can be absorbed when the collision body 36 collides with the rear end portion 20B of the hood 20.

  Specifically, when the collision body 36 collides with the rear end portion 20B of the hood 20, the rear end portion 20B bends downward (in the direction of arrow D) with the fragile portion 30 as a boundary. Part can be absorbed. Further, the rear end portion 20B is bent downward so that the collision body 36 can easily move backward, and the ratio of energy converted from collision energy to kinetic energy can be increased.

  Further, since the reinforcing portion 32 is formed along the vehicle width direction on the vertical wall portion 12A adjacent to the fragile portion 30, when the collision body 36 collides with the upper portion of the reinforcing portion 32 of the hood 20 or the rear end portion 20B. However, there are few deformation strokes, and it becomes difficult for the hood 20 to bottom the lower part (not shown) in the engine compartment 16. Specifically, since the reinforcing portion 32 is located on the vertical wall portion 12A of the hood inner panel 12, even when a surface force acts on the vertical wall portion 12A due to the collision of the collision body 36, the vertical wall portion. It is difficult for buckling deformation to occur in 12A. Since the deformation stroke of the hood 20 is small, the collision body 36 is bounced back to the hood 20 without biting into the hood 20 and rolls backward (for example, the windshield glass 28). Thus, the collision energy can be weakened also by converting a part of the collision energy of the collision body 36 into kinetic energy.

  Furthermore, in the vehicle hood structure S1, the reinforcing member 32 does not take a configuration in which the collision member is detached from the vertical wall portion 12A and absorbs the collision energy at the time of collision, and the reinforcing member 38 is fixed to the vertical wall portion 12A. Therefore, the collision energy can be absorbed by deformation of the fragile portion 30 and conversion to kinetic energy, and the deformation stroke suppression of the hood 20 can be performed by reinforcing the vertical wall portion 12A by the reinforcing member 38. The deformation stroke suppression of the hood 20 and the bottom-out prevention of the hood 20 can both be achieved.

As described above, in the vehicle hood structure S1, the primary collision peak G (maximum acceleration) received by the collision body 36 when the collision body 36 collides with the vicinity of the rear end portion 20B of the hood 20 can be reduced. Further, it is possible to prevent the occurrence of the secondary collision peak G received by the collision body 36 when bottoming occurs. For this reason, when the collision body 36 collides with the vicinity of the rear end portion 20B of the hood 20, it is possible to prevent a large force from being instantaneously input to the collision body 36, thereby the collision body 36. It is possible to protect.
[Second Embodiment]
In FIG. 3, the vehicle hood structure S2 according to the second embodiment includes a reinforcing portion in the vehicle width direction on the vertical wall portion 12A of the hood inner panel 12 that is positioned a predetermined distance forward from the rearmost end 20A of the hood 20 in the closed position. 32 is formed, a fragile portion 30 is formed in the vehicle width direction behind the reinforcing portion 32, and a rear end reinforcing portion 34 is formed in the rear end portion 20B of the hood 20 located behind the fragile portion 30 in the vehicle width direction. Is formed.

  The rear end reinforcing portion 34 is also connected to the reinforcing pipe 40 extending in the vehicle width direction when the rear end 10B of the hood outer panel 10 of the fragile portion 30 is folded back and joined to the hood inner panel 12 (hemming process). Is formed at the rear end 20B of the hood 20.

  In the present embodiment, the fragile portion 30 is located between the reinforcing portion 32 in which the reinforcing member 38 is fixed to the vertical wall portion 12A and the rear end reinforcing portion 34 in which the pipe 40 is disposed at the rear end portion 20B of the hood 20. The hood inner panel 12 and the hood outer panel 10 are overlapping portions. In the case of the present embodiment, a particularly weak portion of the fragile portion 30 is a position where the hood inner panel 12 and the hood outer panel 10 overlap and the rear end 10B of the folded hood outer panel 10 does not overlap (the vertical wall portion 12A). Near the upper edge of.

Since other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and description thereof is omitted.
(Function)
In the vehicle hood structure S <b> 2, the reinforcing portion 32 and the rear end reinforcing portion 34 are provided adjacent to the front side and the rear side of the weak portion 30, respectively. Therefore, the weak portion 30 includes the reinforcing portion 32 and the rear end reinforcing portion. Compared to 34, it is relatively weak. For this reason, when a collision body (not shown) collides with the rear end portion 20B of the hood 20, the rear end portion 20B is deformed so as to be bent downward with the fragile portion 30 as a boundary. Part is absorbed. Further, the rear end portion 20B bends downward, so that the collision body can easily move backward, and the ratio of energy converted from collision energy to kinetic energy can be increased.

  In the reinforcement part 32, since the deformation | transformation at the time of the collision of a collision body is suppressed similarly to 1st Embodiment, the deformation | transformation stroke of the hood 20 can be suppressed and the bottom of the hood 20 can be prevented. In the vehicle hood structure S2, the collision energy when the collision body collides with the vicinity of the rear end portion 20B of the hood 20 can be weakened, and the collision body can be protected.

  On the other hand, since the rear end reinforcing portion 34 reinforces the rear end portion 20B of the hood 20 using the pipe 40, the degree of reinforcement suitable for the vehicle type is selected based on the material, diameter, thickness, etc. of the pipe 40. Can be easily performed.

Further, in the vehicle hood structure S2, a portion of the rear end region of the hood 20 that is easily deformed by the collision of the collision object is limited to the fragile portion 30. As a result, it is possible to stabilize the deformation position of the hood 20 at the time of a collision, and to perform the tuning suitable for each vehicle type with respect to the absorption of the collision energy with respect to the collision load. It becomes easy.
[Third Embodiment]
4, the vehicle hood structure S3 according to the third embodiment includes the hood outer panel 10 in a state where the rear end 12B of the hood inner panel 12 is folded back at the rear end reinforcing portion 34 of the rear end portion 20B of the hood 20. The rear end 10B is coupled by hemming (the hood outer panel 10 is folded and coupled so as to sandwich the hood inner panel 12), and is reinforced. The hood inner panel 12 overlaps with the hood outer panel 10 from the rear end 12B to the vertical wall portion 12A, and a portion that is not folded back becomes a fragile portion 30 that is relatively easily deformed compared to the front and rear. Yes.

Since other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and description thereof is omitted.
(Function)
In the vehicle hood structure S3, the reinforcing portion 32 and the rear end reinforcing portion 34 are provided adjacent to the front side and the rear side of the fragile portion 30, respectively. Therefore, the fragile portion 30 includes the reinforcing portion 32 and the rear end reinforcing portion. Compared to 34, it is relatively weak. For this reason, when a collision body (not shown) collides with the rear end portion 20B of the hood 20, the rear end portion 20B is deformed so as to be bent downward with the fragile portion 30 as a boundary. Part is absorbed. Further, the rear end portion 20B bends downward, so that the collision body can easily move backward, and the ratio of energy converted from collision energy to kinetic energy can be increased.

  In the reinforcement part 32, since the deformation | transformation at the time of the collision of a collision body is suppressed similarly to 1st Embodiment, the deformation | transformation stroke of the hood 20 can be suppressed and the bottom of the hood 20 can be prevented.

  Thus, in the vehicle hood structure S3, the collision energy when the collision body collides with the vicinity of the rear end portion 20B of the hood 20 can be weakened, and the collision body can be protected.

  In the vehicle hood structure S3, the rear end reinforcing portion 34 is folded and joined so that the rear end 12B of the hood inner panel 12 is folded back and the rear end 10B of the hood outer panel 10 is overlapped on the outer side of the rear end 12B. Therefore, the rear end portion 20B of the hood 20 can be reinforced at a low cost without increasing the number of parts.

  In the above embodiment, the configuration of the reinforcing portion 32 has been described as the reinforcing member 38 fixed to the vertical wall portion 12A of the hood inner panel 12. However, the present invention is not limited to this, and for example, the vertical wall portion 12A. In addition, the vertical wall portion 12A may be reinforced by providing ribs or beads that provide a reinforcing effect against the load from above. In this case, since the number of parts is not increased, there is an effect contributing to weight reduction.

1 and 2 relate to a first embodiment, and FIG. 1 is a cross-sectional view of a vehicle hood structure. It is sectional drawing which shows an effect | action when a collision body collides with the hood structure for vehicles. It is sectional drawing which shows the hood structure for vehicles which concerns on 2nd Embodiment. It is sectional drawing which shows the hood structure for vehicles which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hood outer panel 10B Rear end 12 Hood inner panel 12A Vertical wall part 12B Rear end 14 Vehicle 20 Hood 20A Rear end 20B Rear end part 30 Fragile part 32 Reinforcement part 34 Rear end reinforcement part 38 Reinforcement member S1 Vehicle hood structure S2 For vehicles Hood structure S3 Vehicle hood structure

Claims (5)

  A vehicle hood structure, wherein a reinforcing portion extending in a vehicle width direction is provided on a vertical wall portion of a hood inner panel located on a rear end side of a hood in a closed position.   The vehicle hood structure according to claim 1, wherein the reinforcing portion is formed by fixing a reinforcing member extending in the vehicle width direction to the vertical wall portion.   The hood structure for a vehicle according to claim 1 or 2, wherein a fragile portion is provided behind the reinforcing portion along a vehicle width direction.   The hood structure for a vehicle according to claim 3, wherein a rear end reinforcing portion extending in a vehicle width direction is provided at a rear end portion of the hood located behind the fragile portion.   5. The rear end reinforcing portion is formed by folding back and joining the rear end of the hood inner panel so that the rear end of the hood outer panel overlaps the outside of the rear end. Vehicle hood structure.

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