JP2004217008A - Hood structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain uniform shock absorption performance in an entire hood collision surface. <P>SOLUTION: A collision section 20 of an inner panel 14 of the hood 10 comprises five straight framework formation sections 22 arranged in parallel along the longitudinal directions of the vehicle. In the shape of the section of the framework formation section 22, the upper side is open in a hat shape, and a flange 22A is formed at both the end sections of the opening. Additionally, slits 31 are formed between the adjacent framework formation sections 22, and between the framework formation section 22 and an outer frame 14 in the direction of a vehicle width. The framework formation section 22 can obtain uniform shock absorption performance along the front and rear directions of the vehicle on the collision surface of a hood 10 by a change in the height (distance to an outer panel 12). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hood structure of a vehicle, and more particularly to a hood structure of a vehicle for protecting a pedestrian in a collision of a vehicle such as an automobile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a hood structure of a vehicle that protects a pedestrian during a collision in a vehicle such as an automobile, there is no rib between ribs formed on the back surface of a hood outer plate with an energy absorber having a peak against a crushing displacement having one peak. It is attached to a part where there is little clearance with the internal components of the engine room. The energy absorber has a shallow dome shape in which a thin plate is raised so as to form a hill at the center, and a number of first rows of holes are provided along the outer periphery of the dome. The outer periphery of the first row of holes is folded back in the opposite direction to the dome to form a deformed portion, and the deformed portion has a large number of second row holes. Further, a configuration in which a folded outer peripheral end is joined to a rib by spot welding is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-139338
[Problems to be solved by the invention]
However, in Patent Literature 1, when a collision body collides with a hood, appropriate shock absorption is performed at a location of the hood where the energy absorber is attached, but at a location where the energy absorber is not attached, Since the reaction force is too high, or an appropriate reaction force cannot be obtained in the middle portion between the center and the outer periphery of the hood, it is not possible to obtain uniform shock absorbing performance over the entire collision surface of the hood.
[0005]
An object of the present invention is to provide a vehicle hood structure capable of obtaining uniform shock absorption performance over the entire collision surface of the hood in consideration of the above fact.
[0006]
[Means for Solving the Problems]
The present invention according to claim 1 is a hood structure for a vehicle, comprising: an outer member forming an outer surface of a vehicle body of a hood; and an inner member disposed inside the outer member.
An outer peripheral bone formed on the outer peripheral portion of the inner member and having higher rigidity than other portions,
A plurality of skeleton forming portions formed inside the outer peripheral bone of the inner member, extending along the vehicle front-rear direction, and formed alternately with a plurality of notches in the vehicle width direction;
Wherein the cross-sectional shape formed by the skeleton forming portion and the outer member changes along the vehicle front-rear direction.
[0007]
Accordingly, the cross-sectional shape formed by the outer member and the plurality of skeleton forming portions formed inside the outer peripheral bone of the inner member and alternately formed with the plurality of notches along the vehicle front-rear direction has a cross-sectional shape in the vehicle front-rear direction. Is changing along. As a result, by adjusting the change in the cross-sectional shape in the vehicle front-rear direction, the amount of deformation of the hood (stroke downward the vehicle) along the vehicle front-rear direction and the vehicle width direction at the time of collision can be made substantially uniform. it can. For this reason, the HIC value (head obstacle reference value) calculated from the amount of deformation of the hood and the acceleration G received by the collision body can be made substantially uniform at a predetermined value or less over the entire collision surface of the hood. Therefore, uniform shock absorption performance can be obtained over the entire collision surface of the hood.
[0008]
According to a second aspect of the present invention, in the vehicle hood structure according to the first aspect, the shape of the cross section changes at least one of a height and a width of the skeleton forming portion. I do.
[0009]
Therefore, in addition to the contents described in claim 1, by changing at least one of the height and the width of the skeleton forming portion in the inner member, the shape of the cross section formed by the skeleton forming portion and the outer member can be easily changed. Can be done.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a vehicle hood structure according to the present invention will be described with reference to FIGS.
[0011]
Note that the arrow UP in the figure indicates the vehicle body upward direction, and the arrow FR in the figure indicates the vehicle body front direction.
[0012]
As shown in FIG. 2, in the present embodiment, an engine hood 10 of an automobile includes an outer panel 12 as an outer member constituting an outer surface of a vehicle body of the engine hood 10, and an inner side of the outer panel 12. It is composed of an inner panel 14 as an inner member to be constituted.
[0013]
As shown in FIG. 1, the outer bone including the front bone 14A, the rear bone 14B, and the vehicle width direction outer bone 14C in the inner panel 14 of the engine hood 10 has higher rigidity than other parts. The inside of the outer peripheral bones 14A, 14B, and 14C of the inner panel 14 is defined as a collision portion 20.
[0014]
As shown in FIG. 2, a portion S <b> 1 of the upper surface 12 </ b> A of the outer panel 12 above the collision portion 20 of the engine hood 10 is defined as a collision surface 30 of the engine hood 10.
[0015]
As shown in FIG. 3, the collision portion 20 of the inner panel 14 is composed of five linear skeleton forming portions 22 arranged in parallel along the vehicle front-rear direction. Is a hat shape with an opening on the upper side, and flanges 22A are formed at both ends of the opening. In addition, slits 31 extending in the vehicle front-rear direction as notches are formed between the adjacent skeleton forming portions 22 and between the skeleton forming portion 22 and the vehicle width direction outer bone 14C, respectively. The distance W1 between the adjacent skeleton forming portions 22 at the center in the direction, the distance W2 between the adjacent skeleton forming portions 22 outside thereof, and the distance W3 between the outer skeleton forming portion 22 and the vehicle width direction outer bone 14C are: All are equal (W1 = W2 = W3).
[0016]
As shown in FIG. 2, the cross-sectional shape formed by the skeleton forming portion 22 and the outer panel 12 changes along the vehicle front-rear direction, and the cross-sectional shape changes in the vehicle front-rear direction at the collision surface of the hood. Along with this, uniform shock absorption performance can be obtained.
[0017]
Specifically, at the central portion 30A in the front-rear direction on the collision surface 30 of the hood 10, the influence of the outer peripheral bones (the front edge portion 14A and the rear edge portion 14B) on the inner panel 14 is small. Therefore, by increasing the height (distance between the skeleton forming portion 22 and the outer panel 12) H1 of the center portion 22B in the front-rear direction in the skeleton forming portion 22, the cross section formed by the skeleton forming portion 22 and the outer panel 12 is increased. The shape is enlarged.
[0018]
Further, at the front end portion 22C and the rear end portion 22D of the collision surface 30 of the hood 10, the influence of the outer peripheral bone (the front side edge portion 14A and the rear side edge portion 14B) of the inner panel 14 is large. Therefore, by reducing the height H2 of the front end portion 22C and the height H3 of the rear end portion 22D in the skeleton forming portion 22, the cross-sectional shape formed by the skeleton forming portion 22 and the outer panel 12 is reduced. I have.
[0019]
Next, the operation of the present embodiment will be described.
[0020]
In the present embodiment, a plurality of skeletons formed inside the outer peripheral bones 14A, 14B, and 14C of the inner panel 14, extending along the vehicle front-rear direction, and formed alternately with the plurality of slits 31 in the vehicle width direction. The shape of the cross section formed by the portion 22 and the outer panel 12 changes along the vehicle front-rear direction.
[0021]
Specifically, at the central portion 30A in the front-rear direction of the collision surface 30 of the hood 10, since the influence of the outer peripheral bones (the front side edge portion 14A and the rear side edge portion 14B) on the inner panel 14 is small, the front-rear direction of the skeleton forming portion 22 is small. The height H1 of the central portion 22B is higher, and the front end portion 22C and the rear end portion 22D of the collision surface 30 of the hood 10 are affected by the outer peripheral bone (the front side edge portion 14A and the rear side edge portion 14B) of the inner panel 14. Therefore, the height H2 of the front end 22C and the height H3 of the rear end 22D of the skeleton forming portion 22 are low.
[0022]
As a result, a plurality of skeleton forming portions 22 extending in the vehicle front-rear direction and alternately formed with the plurality of slits 31 in the vehicle width direction, and a cross-sectional shape formed by the skeleton forming portion 22 and the outer panel 12. , The amount of deformation (stroke downward of the vehicle) of the hood 10 along the vehicle width direction and the vehicle longitudinal direction at the time of a collision can be made substantially uniform. For this reason, the HIC value (head obstacle reference value) calculated from the amount of deformation of the hood 10 and the acceleration G received by the collision object can be made substantially uniform at a predetermined value or less over the entire collision surface 30 of the hood 10. Therefore, uniform shock absorption performance can be obtained over the entire collision surface 30 of the hood 10.
[0023]
Further, in the present embodiment, by changing the height of the skeleton forming portion 22 in the inner panel 14, the shape of the cross section formed by the skeleton forming portion 22 and the outer panel 12 can be easily changed.
[0024]
In the present embodiment, the height H1 of the central portion 22B in the front-rear direction in the skeleton forming portion 22 is increased, and the height H2 of the front end portion 22C and the height H3 of the rear end portion 22D in the skeleton forming portion 22 are reduced. Alternatively, as shown in FIG. 4, a notch 32, 34 may be formed at the front end 22C and the rear end 22D of the skeleton forming portion 22, respectively.
[0025]
In addition, since the head of a pedestrian having a large physique abuts on the vehicle rear side of the hood 10 from the head of a pedestrian having a small physique, as shown in FIG. The size of the forming portion 22 may be gradually increased from the front end portion 22C side to the rear end portion 22D side.
[0026]
The change in the shape of the cross section formed by the skeleton forming portion 22 and the outer panel 12 is changed by the width W4 of the bottom portion 22E and the width W5 of the opening portion 22F of the skeleton forming portion 22, as shown in FIG. Is also good.
[0027]
Further, as shown in FIG. 7, by changing the inclination angle θ of the left and right vertical wall portions 22 </ b> G in the skeleton forming portion 22, the shape of the cross section formed by the skeleton forming portion 22 and the outer panel 12 may be changed.
[0028]
Further, changes in the plate thickness and material of the skeleton forming portion 22 may be combined.
[0029]
Further, in the present embodiment, the skeleton forming portion 22 is disposed linearly along the vehicle front-rear direction. Alternatively, as shown in FIG. The four skeletal members 22 except the central skeletal member 22 may be bifurcated at the vehicle rear side. In order to average the shock absorbing performance in the vehicle width direction, the branch position P1 of the skeletal member 22 on the outer side in the vehicle width direction may be set to be behind the branch position P2 of the skeletal member 22 on the inner side in the vehicle width direction.
[0030]
As shown in FIG. 9, the distance W1 between the adjacent skeleton forming portions 22 at the center in the vehicle width direction and the distance between the adjacent skeleton forming portions 22 at the outside thereof are aimed at averaging the shock absorbing performance in the vehicle width direction. W2, and the distance W3 between the outer skeleton forming portion 22 and the outer bone 14C in the vehicle width direction may be set to W1 <W2 <W3.
[0031]
As shown in FIG. 10, in order to secure the rigidity of the hood 10, adjacent skeleton forming portions along the straight lines L1 and L2 from the center front portion in the vehicle width direction of the inner panel 14 to the rear portions at both ends in the vehicle width direction. Small bone forming portions 40 having a smaller cross section than the skeletal member 22 may be provided between the skeleton member 22 and the skeleton forming portion 22 and the vehicle width direction outer bone 14C.
[0032]
As shown in FIG. 11, since the head of a pedestrian having a larger physique abuts on the vehicle rear side of the hood 10, each of the pedestrian heads is located between adjacent skeleton forming portions 22 of the inner panel 14 as compared with the skeleton member 22. The small bone forming portion 42 having a small cross section may be provided along the vehicle width direction. In this case, in order to secure the rigidity of the hood 10, the disposition position of the small bone forming portion 42 on the outer side in the vehicle width direction is set to be behind the disposition of the small bone forming portion 42 on the inner side in the vehicle width direction.
[0033]
In order to ensure the rigidity of the hood 10, a plurality of notches 50 may be formed at predetermined intervals in the vehicle front-rear direction, as shown in FIG. 12, instead of the slit 31 in FIG. In this case, since the notch 50 is formed, the weight increase can be suppressed, and the rust prevention effect, the torsional rigidity and the like can be secured.
[0034]
In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention. Some will be apparent to those skilled in the art. For example, the number of the skeleton forming portions 22 of the inner panel 14 is not limited to five. Further, the configuration shown in FIGS. 1 to 11 may be appropriately combined.
[0035]
【The invention's effect】
The present invention according to claim 1 is a vehicle hood structure including an outer member constituting an outer surface of a vehicle body of a hood, and an inner member disposed inside the outer member. A plurality of outer peripheral bones that are formed and have higher rigidity than other parts, and are formed inside the outer peripheral bones of the inner member, extend along the vehicle longitudinal direction, and are formed alternately with a plurality of notches in the vehicle width direction. Since the cross-sectional shape formed by the skeleton forming portion and the outer member changes along the vehicle front-rear direction, uniform shock absorption performance is achieved over the entire collision surface of the hood. It has an excellent effect that it can be obtained.
[0036]
According to a second aspect of the present invention, in the vehicle hood structure according to the first aspect, the shape of the cross section changes because at least one of the height and the width of the skeleton forming portion changes. In addition to the effects described above, there is an excellent effect that the cross-sectional shape of the skeleton can be easily changed.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a hood structure of a vehicle according to an embodiment of the present invention, as viewed from below the vehicle.
FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.
FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG.
FIG. 4 is a cross-sectional view corresponding to FIG. 2, showing a hood structure of a vehicle according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view corresponding to FIG. 2, illustrating a hood structure of a vehicle according to another embodiment of the present invention.
FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 1;
FIG. 7 is a cross-sectional view corresponding to FIG. 6, illustrating a hood structure of a vehicle according to another embodiment of the present invention.
FIG. 8 is a schematic plan view showing a hood structure of a vehicle according to another embodiment of the present invention, as viewed from below the vehicle.
FIG. 9 is a cross-sectional view corresponding to FIG. 3, illustrating a hood structure of a vehicle according to another embodiment of the present invention.
FIG. 10 is a schematic plan view showing a hood structure of a vehicle according to another embodiment of the present invention, as viewed from below the vehicle.
FIG. 11 is a schematic plan view showing a hood structure of a vehicle according to another embodiment of the present invention, as viewed from below the vehicle.
FIG. 12 is a schematic plan view showing a hood structure of a vehicle according to another embodiment of the present invention, as viewed from below the vehicle.
[Explanation of symbols]
10 Engine hood 12 Engine hood outer panel (outer member)
14. Inner panel of engine hood (inner member)
14A front bone (outer bone)
14B posterior bone (outer bone)
14C lateral bone (outer bone)
22 Skeletal formation part 31 of inner panel Slit (notch) of inner panel
30 Impact surface of engine hood 32 Notch of inner panel 50 Notch of inner panel

Claims (2)

An outer member constituting an outer surface of a vehicle body of a hood, and an inner member disposed inside the outer member, a hood structure of a vehicle,
An outer peripheral bone formed on the outer peripheral portion of the inner member and having higher rigidity than other portions,
A plurality of skeleton forming portions formed inside the outer peripheral bone of the inner member, extending along the vehicle front-rear direction, and formed alternately with a plurality of notches in the vehicle width direction;
A hood structure of a vehicle, wherein a cross-sectional shape formed by the skeleton forming portion and the outer member changes along a vehicle front-rear direction. The hood structure for a vehicle according to claim 1, wherein the change in the shape of the cross section is such that at least one of a height and a width of the skeleton forming portion changes.

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