JP4289072B2 - Car hood structure - Google Patents

Description

  The present invention relates to an automobile hood structure.

The front hood is pivotally attached to the front portion of the vehicle, and when there is an input from the outside, it may be preferable to adopt a structure in which the front hood itself deforms and absorbs it. As such a structure, for example, a front hood has been proposed in which reinforcing ribs are disposed on the back surface of the outer panel and an energy absorber as a separate member is disposed on the back surface of the outer panel (see Patent Document 1).
JP-A-5-139338

However, in such a technique, since an energy absorbing structure is constructed by adding another member, it is difficult to realize a reduction in manufacturing cost. This invention is made | formed in view of this condition, and it aims at providing the motor vehicle hood structure which can reduce the manufacturing cost regarding an energy absorption structure easily.

In the present invention, the outer panel and the inner panel are bonded to each other at their edges , and are bonded to each other at an adhesive portion that is located away from the edge , and the inner panel extends along the edge. In the automobile hood structure having a basic skeleton shape portion at a peripheral portion and an auxiliary skeleton shape portion defining a plurality of openings in an intermediate portion surrounded by the basic skeleton shape portion, the basic skeleton shape portion and the auxiliary skeleton the connection of the shaped portion, stepwise shape part is formed by three fold lines extending substantially parallel to said edge, extends in a direction at least one of the fold lines crosses said auxiliary skeleton shaped portion And it is in terminating at the opening .
In the present invention, it is preferable that one surface of the step-shaped portion along the fold line terminating at the opening has an inclination away from the outer panel .

In the automobile hood structure according to the present invention , due to the above configuration, the staircase shape portion becomes a starting point of deformation, and the hood is easily deformed when there is an input larger than a certain level. Moreover, since an energy absorption structure can be comprised without using another member, reduction of manufacturing cost can be implement | achieved easily. In addition, the hood can be lightened by the opening, but it is possible to obtain an advantageous energy absorption structure by providing the bent portion at the opening so that the hood is more deformed.
Further, in the present invention, the stepped shape portion, one face along the fold line terminates at the opening, that has a slope of Ru away from the outer panel, it is also a good moldability of the inner panel .

Next, an embodiment of an automobile hood structure according to the present invention will be described based on the drawings. As shown in FIG. 1, the front hood 1 is attached to the front portion of the vehicle as an engine hood. As shown in FIG. 2, the front hood 1 includes an outer panel 2 and an inner panel 3. The inner panel 3 is provided on the inner side (engine room side) of the outer panel 2 and forms a skeleton of the front hood 1. The inner panel 3 secures the rigidity of the front hood 1 so that it is not easily deformed by wind pressure, car washing, waxing, or the like.
The inner panel 3 has six openings 3a arranged at intervals along the vehicle width direction W. The inner panel 3 includes a basic skeleton shape portion 4 and an auxiliary skeleton shape portion 5. The basic skeleton shape portion 4 is located over the entire circumference of the peripheral edge of the inner panel 3, and the auxiliary skeleton shape portion 5 is located between the openings 3a.
As shown in FIG. 3, the basic skeleton-shaped portion 4 of the inner panel 3 has a hat-shaped portion 4c with flange portions 4a and 4b and facing the outer panel 2 side. The hat-shaped portion 4 c surrounds the periphery of the end portion 2 a of the outer panel 2, and the flange portion 4 a on the outer edge side is hemmed with the end portion 2 a of the outer panel 2. The inner flange portion 4 b is coupled to the outer panel 2 via an adhesive 7. A closed cross-sectional portion 4d is formed by the hat-shaped portion 4c and the inner surface of the outer panel 2.
As shown in FIG. 4, the auxiliary skeleton shape portion 5 of the inner panel 3 is located between the openings 3 a and is a skeleton formed inside the basic skeleton shape portion 4. The auxiliary skeleton shape portion 5 has a hat shape portion 5c with flange portions 5a and 5b and facing the outer panel 2 side. The hat shape portion 5 c is formed continuously with the basic skeleton shape portion 4. Each flange portion 5 a, 5 b is coupled to the outer panel 2 via an adhesive 7. A closed cross-section portion 5d is formed by the hat-shaped portion 5c and the inner surface of the outer panel 2.

  As shown in FIGS. 5 and 6, the inner panel 3 further includes a stepped shape portion 6 between the basic skeleton shape portion 4 and the auxiliary skeleton shape portion 5. The staircase shape portion 6 is formed to be L-shaped in a direction away from the outer panel 2 as it goes from the auxiliary skeleton shape portion 5 to the basic skeleton shape portion 4. The staircase shape portion 6 has three change points 6a, 6b, and 6c. These change points 6a, 6b, and 6c are bent and close to each other, and each fold line extends in the vehicle width direction W. As shown in FIG. 6, the opening 3a reaches the change points 6a and 6b. That is, since each fold line of the change points 6a and 6b crosses the opening 3a, the change points 6a and 6b are easily deformed when there is a certain input or more. For this reason, an absorption structure can be added while suppressing an increase in manufacturing cost, and cost reduction can be easily realized. Moreover, since the opening part 3a is expanded to the position of the change points 6a and 6b, the front hood 1 can be reduced in weight.

Next, the effect | action of this embodiment is demonstrated using FIG. In the case where there is an input F from the outside to the front hood 1 shown in (a) of the figure, when the input F reaches the auxiliary skeleton shape part 5 of the inner panel 3, it is shown in (b) of the figure. As shown, the stepped portion 6 is deformed at the change points 6a and 6b. In this way, when there is an input F, the front hood 1 that has received the action of the input F is easily deformed, and thereby absorbs the input F. The reaction to the input side can be reduced.
As shown in FIG. 8, the front hood 1 'can be easily deformed when the front hood 1' does not include the stepped portion 6 and the opening 3a 'is small (see FIG. 8A). (See (b) in the figure), the input F cannot be absorbed as much, and the reaction becomes larger than in the case of the present embodiment.

  The configuration and operation of one embodiment of the present invention have been described above, but the present invention is not limited to this. Another embodiment will be described with reference to FIGS. 9 and 10. As shown in FIG. 9, it can also be set as the U-shaped part 8 with the change points 8a-8e instead of the L-shaped step shape part 6. As shown in FIG. Moreover, as shown in FIG. 10, it can also be set as the circular arc-shaped part 9 with the change points 9a-9c instead of the L-shaped step shape part 6. FIG. That is, a fragile portion serving as a trigger for deformation may be formed between the basic skeleton shape portion 4 and the auxiliary skeleton shape portion 5.

The layout of the auxiliary skeleton shape portion 5 of the inner panel 3 varies depending on the design and size of the front hood. In the embodiment described above, as shown in FIG. 2, six openings 3a are provided, and five auxiliary skeleton-shaped portions 5 are installed so as to extend in the vehicle front-rear direction and to be substantially parallel to each other. .
As a modification thereof, as shown in FIG. 11, six opening portions 3a are provided, and the auxiliary skeleton shape portion 10a extending in the vehicle width direction intersects with the auxiliary skeleton shape portions 10b and 10c extending in the vehicle front-rear direction. Installed. Then, a staircase shape is provided between each end portion of the auxiliary skeleton shape portion 10a and the basic skeleton shape portion 4, and between the end portions of the auxiliary skeleton shape portions 10b and 10c in front of the vehicle and the basic skeleton shape portion 4, respectively. The part 11 may be provided. The staircase shape portion 11 is configured similarly to the staircase shape portion 6 (see FIG. 5). In this modified example, the auxiliary skeleton shape portion 10a extending in the vehicle width direction is also provided with the staircase shape portion 11, so that the change point that becomes the starting point of the change increases, and when there is an input F from the outside, the front The hood 1 can be positively deformed to further reduce the reaction to the contact object. The staircase shape portion 11 may be provided only at both ends of the auxiliary skeleton shape portion 10a, or may be provided only at the front end portions of the auxiliary skeleton shape portions 10b and 10c. Furthermore, you may provide only in the vehicle rear end part of the auxiliary | assistant frame | skeleton shape parts 10b and 10c.
As another modification, the same effect can be obtained by arranging the auxiliary skeleton shape portions so as to cross each other and providing a staircase shape portion between the basic skeleton shape portions.

1 is a perspective view of an automobile to which an automobile hood structure according to an embodiment of the present invention is applied. It is a disassembled perspective view of the front hood of FIG. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. It is an expanded sectional view by line IV-IV of FIG. It is an expanded sectional view by line VV of FIG. FIG. 3 is an enlarged cross-sectional view taken along line VI-VI in FIG. 2. (A) is a longitudinal cross-sectional view of the front hood of FIG. 1, (b) is a longitudinal cross-sectional view which shows a deformation | transformation when there exists input in this front hood. (A) is a longitudinal cross-sectional view of the front hood which does not have a staircase shape part, (b) is a longitudinal cross-sectional view which shows a deformation | transformation when there exists input in this front hood. It is sectional drawing which shows the modification of this invention corresponding to FIG. It is sectional drawing which shows another modification of this invention corresponding to FIG. It is a perspective view which shows another modification of this invention corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front hood 2 Outer panel 2a End part 3 Inner panel 3a Opening part 4 Basic frame shape part 4a, 4b, 5a, 5b Flange part 4c, 5c Hat shape part 4d, 5d Closed cross-section part 5, 10a, 10b, 10c Skeletal shape part 6, 11 Step shape part 6a, 6b, 6c, 8a, 8b, 8c, 8d, 8e, 9a, 9b, 9c Change point (folded part)
7 Adhesive 8 U-shaped part 9 Arc-shaped part F Input W Vehicle width direction

Claims (2)

The outer panel and the inner panel are bonded to each other at their edges , and are bonded to each other at an adhesive portion that is located away from the edge , and the inner panel is a base of a peripheral portion along the edge. In an automobile hood structure having a skeleton shape portion and an auxiliary skeleton shape portion that defines a plurality of openings in an intermediate portion surrounded by the basic skeleton shape portion ,
The connecting portion between said basic skeleton shape portion the auxiliary skeleton shaped portion, stepwise shape part is formed by three fold lines extending substantially parallel to the edges, at least one of said of said fold lines An automobile hood structure which extends in a direction crossing the auxiliary skeleton shape portion and terminates at the opening . 2. The automobile hood structure according to claim 1 , wherein one surface of the step-shaped portion along the fold line that terminates at the opening has an inclination away from the outer panel.

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