JP4434132B2 - Vehicle hood structure - Google Patents

Description

  The present invention relates to a vehicle hood structure including a hood outer and a hood inner.

  Japanese Patent Application Laid-Open No. 2004-151561 discloses a technique in which an engine hood that opens and closes an engine room is composed of a hood outer panel and a hood inner panel, and a plurality of beads extending in the vehicle front-rear direction are formed on the hood inner panel at predetermined intervals in the vehicle width direction Is disclosed.

According to the above configuration, since the rigidity of the hood inner panel is increased by providing the plurality of beads, the deformation of the hood outer panel when the collision body collides with the hood outer panel from above can be suppressed.
JP 2005-53285 A

  By the way, as an alternative to the hood inner panel provided with the prior art bead, there is a technique in which a plurality of skeleton members having a cross-sectional hat shape are arranged along the vehicle front-rear direction on the back side of the hood outer panel. In this case, it is ideal to arrange the skeleton member so that the rigid portions of the front portion of the hood and the rear portion of the hood are linearly connected.

  However, if the skeleton member is ideally arranged, the skeleton member may overlap with a solid object such as an air cleaner or a relay box disposed in the engine room in plan view. Therefore, when a colliding body collides with this part, the deformation stroke of the engine hood is shortened. In particular, in the vicinity of both ends of the engine hood in the vehicle width direction, the distance in the vehicle vertical direction between the solid object and the skeleton member tends to be short, so it is difficult to ensure the deformation stroke of the engine hood. Based on this point, in the above prior art, the distance between the beads is set so that the skeletal member does not come into contact with the solid object when the collision object collides with the engine hood, that is, the skeleton member is arranged avoiding the solid object. In this case, the skeleton member is arranged slightly deviated from the ideal arrangement.

  In other words, conventionally, it has been difficult to achieve both the ideal arrangement of the skeleton member that reinforces the hood outer and the securing of the deformation stroke of the hood when the collision body collides from above.

  In consideration of the above fact, the present invention can achieve both the ideal arrangement of the skeleton member that reinforces the hood outer and the securing of the deformation stroke of the hood when the collision body collides from above. The object is to obtain a hood structure for a vehicle.

  According to a first aspect of the present invention, there is provided a vehicle hood structure comprising: a hood outer that constitutes an outer plate of a hood that covers the engine room so as to be openable and closable; and a hood lower part disposed on the back side of the hood outer and in the engine room. A hood inner having an inclined surface on the bottom surface that is disposed in the upper vicinity and extends along the vehicle front-rear direction to reinforce the hood outer and the side away from the hood lower part is higher than the side approaching the hood lower part It is characterized by having.

According to a second aspect of the present invention, in the hood structure for a vehicle according to the first aspect, the hood inner is configured as a skeleton member having the inclined surface, or the hood inner is configured in a panel shape. The skeleton member having the inclined surface is integrally provided, and the skeleton member has a hat-shaped cross-section when cut along the vehicle width direction, and is away from the hood lower part. It is characterized in that the bottom wall is inclined by setting the vertical wall located at a position higher than the vertical wall located on the side closer to the hood lower part.

According to a third aspect of the present invention, in the hood structure for a vehicle according to the second aspect , the centroid position of the cross section of the skeletal member is relative to the lower hood component so as not to overlap the lower hood component in plan view. It is characterized by being set closer to the vertical wall located on the far side.

  According to the first aspect of the present invention, the hood inner that reinforces the hood outer is disposed on the back side of the hood outer and in the vicinity of the upper part of the hood lower part. Since the hood inner extends along the vehicle front-rear direction, an ideal arrangement can be obtained.

  In addition, when a collision body collides from the upper side of the hood outer, the amount of deformation of the hood outer to the vehicle lower side is suppressed by the hood inner, but the hood inner is also displaced to the vehicle lower side. There is a possibility of abutting against the disposed hood lower part. However, the hood inner of the present invention has an inclined surface on the bottom surface that is higher on the side away from the hood lower part than on the side closer to the hood lower part. The deformation is induced so that the lower part of the hood slides relatively on the surface and opens to the side away from the lower part of the hood. Accordingly, the deformation stroke of the hood outer toward the vehicle lower side is increased by the opening amount.

According to the second aspect of the present invention, when the hood inner itself is configured as a skeleton member, or when the skeleton member is formed on the hood inner panel, the skeleton member has a cross-sectional hat shape, and both longitudinally Since the inclined surface is formed by providing the wall with a height difference, the inclination angle of the inclined surface is determined by the height difference between the two vertical walls. Therefore, the amount of rotation in the direction away from the hood lower part with respect to the movement stroke of the skeleton member to the vehicle lower side can be arbitrarily changed.

According to the third aspect of the present invention, the centroid position of the cross section of the skeleton member is set closer to the vertical wall located on the side away from the hood lower part so as not to overlap the hood lower part in plan view. Therefore, the rotational displacement direction of the skeleton member is stabilized.

  In the vehicle hood structure according to the first aspect of the present invention, a skeleton member that reinforces the hood outer is ideally disposed, and a deformation stroke of the hood is ensured when the collision body collides from above. It has the outstanding effect that both can be aimed at.

The vehicle hood structure according to the second aspect of the present invention has an excellent effect that it is possible to easily tune the energy absorption amount when the collision object collides.

In the vehicle hood structure according to the third aspect of the present invention, since the mode of rotational displacement of the skeleton member is stabilized, the reliability for securing the deformation stroke of the hood outer panel when the collision body collides can be improved. It has an excellent effect of being able to.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle hood structure according to the present invention will be described with reference to FIGS. 1 and 2. In these figures, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 1 shows an enlarged cross-sectional view (a cross-sectional view as seen from the vehicle front side when the hood is cut in the vehicle width direction) of the main part of the vehicle hood structure according to the present embodiment.

  As shown in this figure, a front fender panel 12 constituting a side plate of the front portion of the vehicle body is disposed outside the engine room 10 in the vehicle width direction. The upper end portion 12A of the front fender panel 12 extends inward in the vehicle width direction, and then bends and hangs downward in the vehicle, and further extends inward in the vehicle width direction.

  An apron upper member 18 having a closed cross-sectional structure with an apron upper member upper 14 having a hat-shaped cross section and an apron upper member lower 16 having a substantially U-shaped cross section is disposed on the front inner side of the front fender panel 12. It extends along the direction. The upper lower end 12B of the front fender panel 12 described above is brought into contact with the upper end of the apron upper member upper 14 and is joined by a joining means such as spot welding.

  Further, the upper end portion 20A of the apron 20 constituting the side walls of both sides of the engine room 10 is joined to the lower end portion 18A of the apron upper member 18 by joining means such as spot welding.

  A substantially horizontal shelf 20B is formed in the vicinity of the middle portion of the apron 20 in the vehicle vertical direction. A mounting bracket 22 having a hat-shaped cross section is joined to the shelf portion 20B by joining means such as spot welding, and a solid object 24 as a hood lower part is placed on the mounting bracket 22. Examples of the solid object 24 include an air cleaner, a fuse box, a relay box, and an engine head cover.

  The engine room 10 described above can be opened and closed by an engine hood 30 constituted by a hood outer 26 constituting a hood outer plate and a plurality of hood inners 28 arranged at predetermined intervals along the vehicle width direction on the back side thereof. Is closed. The hood outer 26 and the hood inner 28 are both formed by press-forming steel plates.

  The hood inner 28 is linearly disposed along the vehicle front-rear direction so as to connect the front portion of the hood and the rear portion of the hood, and the skeleton member of the engine hood 30 (reinforcing bone disposed on the back side of the hood outer 26). Is configured. As a result, the rigidity of the hood outer 26 is increased. Further, the hood inner 28 is formed in a hat shape in cross section, and a bottom wall portion 28A, a pair of left and right side wall portions 28B and 28C disposed substantially perpendicular to both sides thereof, and an upper end portion of each of the side wall portions 28B and 28C are mutually connected. It is comprised by terminal part 28D, 28E bent in the direction which leaves | separates. In the hood inner 28, left and right terminal portions 28D and 28E are fixed to the back side of the hood outer 26 with an adhesive or the like. Note that the terminal portion 28D of the hood inner 28 disposed on the outermost side is integrated by hemming processing in which the width direction terminal portion 26A of the hood outer 26 is folded back.

  Here, the hood inner 28 having the above-described configuration is disposed in the vicinity of the upper end corner 24A of the solid object 24 described above so as to face the upper end corner 24A. Therefore, the distance of the gap 32 between the bottom wall portion 28A of the hood inner 28 and the upper end corner portion 24A of the solid object 24 is shortened. Therefore, in the present embodiment, the height of the side wall portion 28B located on the side away from the upper end corner portion 24A of the solid object 24 is higher than the height of the side wall portion 28C located on the side closer to the upper end corner portion 24A. It is set to be. As a result, the bottom wall portion 28A of the hood inner 28 is inclined. That is, when the pair of left and right hood inners 28 arranged to face the upper end corner portion 24A of the solid object 24 is viewed from the front side of the vehicle, the inclined surfaces are formed so that the left and right bottom wall portions 28A have a square shape. Is set.

  Furthermore, the centroid position O (see FIG. 2) of the hood inner 28 is offset to the side away from the solid object 24 so as not to overlap the solid object 24 in plan view.

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

  According to the vehicle hood structure according to the present embodiment, the hood inner as a skeleton member having a cross-sectional hat shape for reinforcing the hood outer 26 on the back surface side of the hood outer 26 and in the vicinity of the upper end corner 24A of the solid object 24. Since 28 is arranged so as to extend in the vehicle front-rear direction from the front of the hood to the rear of the hood, the hood inner 28 can be ideally arranged.

  Further, when the hood inner 28 is ideally arranged as described above, the hood inner 28 may be arranged in the vicinity of the solid object 24 arranged in the engine room 10. In general, the space below the engine hood 30 (gap in the vertical direction) is large on the center side of the engine hood 30 and small on the end side in the width direction, and therefore there is a solid object 24 on the apron 20 side in the engine room 10. The distance of the gap 32 between the hood inner 28 and the solid object 24 is shortened.

  Therefore, in this state, as shown in FIG. 2, when the collision body 34 collides with the hood outer 26 from the upper side of the hood outer 26, the hood outer 26 is deformed so as to protrude downward. Since the inner 28 is also displaced to the vehicle lower side, the bottom wall portion 28A of the hood inner 28 comes into contact with the solid object 24 first.

  Here, in the present embodiment, the cross-sectional shape of the hood inner 28 disposed near the upper end corner 24A of the solid object 24 is the height of the side wall 28B on the side away from the upper end corner 24A. By setting the height difference so as to be higher than the height of the side wall portion 28C on the side approaching the upper end corner portion 24A, the bottom wall portion 28A of the pair of left and right hood inners 28 is shaped like a letter C when viewed from the front of the vehicle. When the hood inner 28 is displaced downward with the deformation of the hood outer 26, the bottom wall portion 28A of the hood inner 28 first comes into contact with the upper end corner portion 24A. When the hood inner 28 is deformed downward and the hood inner 28 is pressed to the vehicle lower side, the upper end corner portion 24A slides on the bottom wall portion 28A and is rotationally displaced (twisted) in a direction away from the solid object 24. That is, the left and right hood inners 28 are rotationally displaced so as to open in directions away from each other around the solid object 24. Thereby, the deformation | transformation stroke (meaning the deformable stroke) to the vehicle lower side of the site | part 26B located between the left-right paired hood inner 28 in the hood outer 26 becomes long, and energy absorption amount increases.

  In summary, according to the vehicle hood structure according to the present embodiment, the skeleton member (hood inner 28) that reinforces the hood outer 26 is ideally arranged (that is, linearly arranged from the front of the hood to the rear of the hood). In addition, it is possible to achieve both of the arrangement in an optimal position in the vehicle width direction and securing the deformation stroke of the engine hood 30 when the collision body 34 collides from above.

  In the present embodiment, the basic cross-sectional shape of the hood inner 28 that is a skeleton member is not changed from the hat shape, but only the height of the side wall portions 28B and 28C is changed. Thus, the inclination angle of the bottom wall portion 28A can be set in any way. Therefore, the amount of rotation in the direction away from the solid object 24 (vehicle width direction) with respect to the movement stroke of the hood inner 28 toward the vehicle lower side can be arbitrarily changed. As a result, according to the present embodiment, the energy absorption amount when the collision body 34 collides can be easily tuned.

  Further, in the present embodiment, the centroid position O of the hood inner 28 is set closer to the side wall 28B located on the side away from the solid object 24 so as not to overlap the solid object 24 in plan view. The rotational displacement direction of is stabilized. That is, when the bottom wall portion 28 </ b> A of the hood inner 28 comes into contact with the upper end corner portion 24 </ b> A of the solid object 24, the hood inner 28 can be reliably displaced in a direction away from the solid object 24. As a result, the rotational displacement mode of the hood inner 28 is stabilized, and the reliability of securing the deformation stroke of the hood outer 26 when the collision body 34 collides can be improved.

[Second Embodiment]
Next, a second embodiment of the vehicle hood structure 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.

  As shown in FIG. 3, in the vehicle hood structure according to the second embodiment, the hood outer 42 and the hood inner 44 constituting the engine hood 40 are not made of a steel plate but are made of an aluminum alloy material. In this case, extrusion molding is used.

  Further, the hood outer 42 and the hood inner 44 constituting the engine hood 40 are both configured as panel materials. Further, a skeleton-shaped portion 46 having a closed cross-sectional structure is integrally formed on the lower surface side of the hood inner 44 at a predetermined interval. The skeleton-shaped portion 46 also includes a bottom wall portion 46A and a pair of left and right side wall portions 46B and 46C, and the height of the side wall portion 46B located on the side away from the solid object 24 is closer to the solid object 24. It is set so as to be higher than the height of the side wall portion 46C located at the position. As a result, the bottom wall portions 46A of the pair of left and right skeleton-shaped portions 46 are inclined in a C shape when viewed from the front of the vehicle and are disposed to face the upper end corner portions 24A of the solid object 24. Furthermore, the centroid position O of the skeleton-shaped portion 46 is arranged so as not to overlap the solid object 24 in plan view.

  Also with the above configuration, when the collision body 34 collides with the hood outer 26 from above, the skeleton shape portion 46 behaves in the same manner as in the first embodiment described above. Accordingly, both the ideal arrangement of the skeleton-shaped portion 46 of the hood inner 44 that reinforces the hood outer 42 and the securing of the deformation stroke of the engine hood 40 when the collision body 34 collides from the upper side are achieved. Can be planned. Further, the other effects described in the first embodiment can be obtained similarly.

  In the above configuration, the skeleton-shaped portion 46 has a closed cross-sectional structure. However, the present invention is not limited to this, and a configuration in which the skeleton-shaped portion is provided by making the hood inner a corrugated cross-sectional shape may be employed.

Furthermore, skeletal shaped portion 46 of the second embodiment since the incorporated integrally in the panel shape of the hood inner 44, are formed in a hollow substantially trapezoidal shape, the present invention of the shape according to claim 2, wherein This is included in the “hat shape”.

[Supplementary explanation of the above embodiment]

In the engine hood 30 of the first embodiment, the hood inner 28 itself constitutes a skeleton member. However, the hood inner 28 itself is not limited to this, and a cross-sectional hat shape corresponding to the skeleton shape portion 46 in the second embodiment. A hood inner panel made of a steel plate in which the skeleton-shaped portions are integrally formed may be used.

In the first and second embodiments described above, shifting the centroid position O of the hood 28 and the skeleton-shaped portion 46 in a position that does not overlap with the solid material 24 in plan view, according to claim 1 or claim 2, wherein The present invention includes a configuration in which the centroid position O is located within a range overlapping the solid object 24 in plan view.

It is sectional drawing which expanded the principal part of the hood structure for vehicles which concerns on 1st Embodiment (sectional drawing which cut | disconnected the hood to the vehicle width direction and was seen from the vehicle front side). It is a principal part expanded sectional view which shows the deformation | transformation behavior of a hood when the collision body has collided from the upper direction of the hood in 1st Embodiment. It is sectional drawing to which the principal part of the hood structure for vehicles which concerns on 2nd Embodiment was expanded (sectional drawing which cut | disconnected the hood to the vehicle width direction and was seen from the vehicle front side).

Explanation of symbols

10 Engine room 24 Solid (hood lower part)
24A Upper end corner portion 26 Hood outer 28 Hood inner 28A Bottom wall portion (inclined surface)
28B side wall (vertical wall located on the side away from the hood lower part)
28C side wall (vertical wall located on the side closer to the hood lower part)
30 Engine hood (hood)
34 Colliding body 40 Engine hood (hood)
42 Hood Outer 44 Hood Inner 46 Frame Shape 46A Bottom Wall (Inclined Surface)
46B side wall (vertical wall located on the side away from the hood lower part)
46C side wall (vertical wall located on the side closer to the hood lower part)
O Centroid position

Claims (3)

A hood outer that forms an outer plate of the hood that covers the engine room in an openable and closable manner;
The back side of the hood outer and the vicinity of the lower part of the hood disposed in the engine room are arranged above the hood outer and extend along the longitudinal direction of the vehicle to reinforce the hood outer. A hood inner having an inclined surface on the bottom surface that is higher than the side approaching the part;
A vehicle hood structure characterized by comprising: The hood inner itself is configured as a skeleton member provided with the inclined surface, or the hood inner is configured in a panel shape and the skeleton member provided with the inclined surface is integrally provided,
The skeleton member has a hat-shaped cross-section when cut along the vehicle width direction, and the vertical wall located on the side away from the hood lower part is located on the side closer to the hood lower part By setting it higher than the bottom surface is an inclined surface,
The vehicle hood structure according to claim 1 . The centroid position of the cross section of the skeleton member is set closer to the vertical wall located on the side away from the hood lower part so as not to overlap the hood lower part in plan view.
The vehicle hood structure according to claim 2 .

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