JP5942883B2 - Automotive exterior parts - Google Patents

Description

  The present invention relates to a vehicle exterior such as a hood and a front fender, which are provided at the front of a body of an automobile and require pedestrian protection by absorbing shock.

  When a pedestrian falls down due to contact with an automobile and comes into contact with an exterior vehicle component such as a hood (bonnet) or a front fender at the front of the vehicle, the pedestrian may receive an impact from the exterior vehicle component. Therefore, for example, in a general automobile hood in which a metal inner panel is arranged on the vehicle inner side (engine room side) of a metal outer panel, when external force is applied due to contact with a pedestrian, the contact energy is increased. By absorbing (consuming), a structure is provided for relaxing the impact applied to the pedestrian. On the other hand, in recent years, from the viewpoint of improving the fuel efficiency of automobiles, the above-mentioned exterior parts for automobiles have been required to be reduced in weight like other parts.

  As a technology that meets such a demand, for example, in Patent Document 1, as shown in FIG. 9A, an outer plate portion 71 having an outer surface as a design surface, and an inner plate disposed on the inner side of the outer plate portion 71 are shown. An automobile hood is proposed that includes a plate portion 72 and a partition wall 74 that defines a hollow portion 73 between the outer plate portion 71 and the inner plate portion 72.

  The inner plate portion 72 and the partition wall 74 are integrally formed of a resin, and the weight is reduced as compared with that made of metal. A weakened portion 75 is provided at a location facing the hollow portion 73 in the inner plate portion 72. A hard support member 76 is disposed on the inner side of the inner plate portion 72, and movement of the inner plate portion 72 toward the inner side of the vehicle is restricted by the support member 76.

  And when the external force F which goes to the inner side of a motor vehicle is applied with respect to the outer-plate part 71 from the fallen pedestrian, since the movement to the same direction of the inner-plate part 72 is controlled, it is to FIG. 9 (B). As shown, the inner plate portion 72 is bent and broken at the fragile portion 75. As the broken inner plate portion 72 enters the hollow portion 73, the outer plate portion 71 is deformed inward of the automobile. Due to such bending and breakage of the inner plate portion 72, deformation of the outer plate portion 71, contact energy is absorbed (consumed), and the impact applied to the pedestrian is alleviated.

Special table 2010-510133

  However, in a conventional automobile exterior product including the automobile hood, after the inner plate portion 72 is partially broken, the remaining portion of the inner plate portion 72 immediately comes into contact with the hard support member 76. No energy is absorbed after this contact. Therefore, the amount of energy absorbed by the automobile exterior product is small, and it is difficult to cope with the case where more energy absorption is required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an automotive exterior product capable of improving energy absorption performance and further mitigating an impact applied to a pedestrian. .

An automotive exterior product that solves the above problems includes an outer plate portion having an outer surface as a design surface, an inner plate portion disposed on the vehicle inner side of the outer plate portion, the outer plate portion, and the inner plate portion. As an automobile exterior comprising a partition wall that defines a hollow portion therebetween, the partition wall absorbs energy when an external force toward the inside of the vehicle is applied through the outer plate portion, At least a first absorption portion at the first stage and a second absorption portion at the second stage are provided in a state of being aligned in the inside and outside directions of the automobile, and the first absorption portion and the second absorption portion are subjected to the external force. Accordingly, the first absorption part is deformed to absorb energy, and after the energy absorption by the first absorption part, the second absorption part starts to be deformed and absorbs energy, and the first absorption part is formed. The absorption part is provided in the vicinity of the outer plate part, and the second absorption Is provided closer to the inner plate part than the first absorbent part, the second absorbent part has higher strength than the first absorbent part, and the partition wall is formed by a plurality of partition parts. A part of the first absorption part and a part of the second absorption part are formed in a cylindrical shape, and the main absorption part provided in a place different from the boundary part with the adjacent partition part in the partition part. The main absorbent portion includes a plate-like outer main weak portion extending from the outer plate portion toward the inner plate portion as the first absorbent portion, and as the second absorbent portion, respectively. A pair of inner main fragile portions that form a plate shape and extend from the inner plate portion toward the outer plate portion in a state of being separated from each other, and extend in a direction perpendicular to the inner and outer directions of the automobile, and the outer main fragile portions Connecting the inner end of the vehicle and the outer end of each inner main fragile portion It comprises a fragile part, a part of the first absorption part and a part of the second absorption part constitutes a sub-absorption part provided in the boundary part of the adjacent partition part, the sub-absorption part, As the first absorption portion, it has a cylindrical shape and extends from the outer plate portion toward the inner plate portion, and includes an outer sub-fragile portion whose outer end is closed by a lid portion, and As a second absorbing portion, an inner sub weak portion extending from the inner plate portion toward the outer plate portion in a cylindrical shape having a diameter larger than that of the outer sub weak portion, and a surface orthogonal to the inner and outer directions of the automobile The outer sub-fragile portion includes a connecting sub-fragile portion that connects a vehicle inner end portion of the outer sub-fragile portion and a vehicle outer end portion of the inner sub-fragile portion, and the outer plate portion includes the main absorption portion. A vehicle outer surface of the outer main fragile portion in a portion, and a vehicle outer surface of the lid portion in the sub-absorption portion It is fixed to the adhesive.

Here, the deformation includes not only bending and bending but also breaking.
According to said structure, when the external force which goes to the inner side of a motor vehicle through the outer plate part is added with respect to the exterior product for motor vehicles by the contact with the pedestrian of a motor vehicle, the external force is the 1st absorption part and the 2nd absorption part. To the inner plate portion. Due to the external force transmitted in this way, the first absorption portion of the first stage is deformed, so that the contact energy is absorbed and the impact applied to the pedestrian from the automobile is alleviated. After the first absorber starts to deform, the second absorber in the second stage starts to deform. Due to the deformation of the second absorption part, the contact energy is further absorbed, and the impact applied to the pedestrian is further alleviated. As described above, the energy absorption by the second absorption part is continued even after the energy absorption by the first absorption part. Therefore, more energy is absorbed than that in which only the first-stage energy absorption is performed. Accordingly, the impact on the pedestrian is reduced.

  According to said structure, when external force is added with respect to the exterior | packing goods for motor vehicles by the contact with the pedestrian of a motor vehicle, the energy of contact is absorbed by the 1st absorption part of the 1st step changing, and a pedestrian The shock applied to is reduced. After the energy absorption by the first absorption part is finished, the second absorption part in the second stage starts to be deformed, so that the energy is further absorbed and the impact applied to the pedestrian is further alleviated. Therefore, energy is absorbed over a period longer than that in the middle of energy absorption by the first absorption unit than energy absorption by the second absorption unit.

According to the configuration above reporting, by contact with a pedestrian automobile, an external force is applied to the exterior parts for automobiles, initially, the first absorption part of the first stage provided in the vicinity of the outer plate portion is deformed By doing so, the energy of contact is absorbed. After the energy absorption by the first absorption part is completed, the second absorption part at the second stage provided on the inner plate part side of the first absorption part is deformed to further absorb energy.

According to said structure, when external force is added with respect to the exterior | packing goods for motor vehicles by the contact with the pedestrian of a motor vehicle, a part of the external force is a boundary part with an adjacent partition part in the partition part which comprises a partition. It is added to the main absorption part provided in many places of each partition part, ie, each partition part. In the main absorbing portion, the external force is transmitted to the inner plate portion via the plate-shaped outer main fragile portion , the connected main fragile portion, and the pair of plate-shaped inner main fragile portions . Due to the external force transmitted in this manner, the outer main fragile portion is first deformed to absorb contact energy. After the energy absorption by the outer main fragile portion is completed, the connected main fragile portion and the both inner main fragile portions are deformed to further absorb energy.

According to said structure, when external force is added with respect to the exterior | packing goods for motor vehicles by the contact with the pedestrian of a motor vehicle, the external force is a cylindrical outer side sub weak part , a cyclic | annular connection sub weak part in a sub absorption part. , And the inner sub-fragile portion having a diameter larger than that of the outer sub-fragile portion . Due to the external force transmitted in this way, the outer sub-fragile portion is first deformed, so that the contact energy is absorbed. After the energy absorption by the outer sub-fragile portion is completed, the connecting sub-fragile portion and the inner sub-fragile portion are deformed to further absorb energy.

According to said structure, an outer-plate part is adhesively fixed with respect to a main absorption part and a subabsorption part. Here, if only the main absorption part is provided as the absorption part in the partition wall (the sub absorption part is not provided), the outer plate part is bonded and fixed only at the outer main weak part of the main absorption part. It will be. However, the outer main fragile portion of the main absorbent portion has a plate shape and is bonded to the outer plate portion on the outer surface of the vehicle, so that there is a limit to a wide bonding area. However, the partition wall in addition to the main absorbent portion, have sub absorbing portion is provided with an outer sub fragile portion, adhesion between the outer plate portion is performed also in the lid of the outer sub fragile portion. The vehicle outer surface of the lid portion is wider than the vehicle outer surface of the outer main fragile portion in the main absorption portion. Therefore, as the lid portion is added to the bonding, the bonding area of the outer plate portion to the main absorption portion and the sub absorption portion is expanded, and the outer plate portion is more firmly bonded to the main absorption portion and the sub absorption portion.

In the automotive exterior product, it is preferable that a slit is formed in at least one of the first absorption portion and the second absorption portion.
According to said structure, the intensity | strength of a 1st absorption part and a 2nd absorption part falls by forming a slit. Accordingly, the first absorption part and the second absorption part in which the slit is formed are easily deformed, and the amount of energy that can be absorbed by the first absorption part and the second absorption part is different from that without the slit. Come. Therefore, the energy absorption performance can be easily adjusted by appropriately forming the slits.

Moreover, the thing in which the slit was formed among the 1st absorption part and the 2nd absorption part becomes lighter than the thing in which a slit is not formed.
In the automotive exterior product, it is preferable that at least one of the outer plate portion, the partition wall, and the inner plate portion is formed of a resin.

  According to said structure, when at least 1 is formed with resin among an outer-plate part, a partition, and an inner-plate part, all become lighter than what was formed with the metal.

  According to the automobile exterior article, at least the first absorption part and the second absorption part are arranged in an inner and outer direction of the automobile as an absorption part that absorbs contact energy, and the first absorption part absorbs energy. Since the energy absorption is continued by the second absorption part later, the energy absorption performance can be improved and the impact applied to the pedestrian can be further alleviated.

The partial perspective view of the hood for cars which is one embodiment of the exterior goods for cars. The partial perspective view which expands and shows a part of hood for motor vehicles of FIG. The fragmentary sectional view of the main absorption part in one embodiment. The fragmentary sectional view of the sub absorption part in one Embodiment. (A)-(D) are the fragmentary sectional views explaining a mode that the hood for cars of one embodiment changes in a main absorption part, and absorbs energy. (A)-(D) are the fragmentary sectional views explaining a mode that the hood for cars of one embodiment changes in a sub absorption part, and absorbs energy. It is a figure which shows another example of the main absorption part in which the slit was formed, (A) is a fragmentary perspective view, (B) is a fragmentary sectional view. It is a figure which shows another example of the subabsorption part in which the slit was formed, (A) is a fragmentary perspective view, (B) is a fragmentary sectional view. It is a figure which shows the conventional automotive exterior goods, (A) is a fragmentary sectional view which shows the state before energy is absorbed, (B) is a fragmentary sectional view which shows the state in which energy is absorbed.

Hereinafter, an embodiment of an automotive exterior product will be described with reference to FIGS.
In the following description, the side closer to the center of the engine room is referred to as “vehicle inside”, and the side away from the center is referred to as “vehicle outside”. In each figure, “inside” and “outside” are described as “inside” and “outside”, respectively. The same applies to FIGS. 7A and 7B showing another example, FIGS. 8A and 8B, and FIGS. 9A and 9B showing the prior art.

  An automobile hood that opens and closes the engine room is provided at the front part of the automobile as an automobile exterior product. The automobile hood is formed in a planar shape capable of closing the engine room from above.

FIG. 1 shows a part of an automobile hood CH. The automobile hood CH includes an outer plate part 10, an inner plate part 20, and a plurality of partition walls 30 indicated by a two-dot chain line.
The outer plate portion 10 is a member positioned on the outermost side of the vehicle hood CH, and corresponds to an outer panel in a general vehicle hood formed entirely of metal. The outer plate part 10 is formed by performing injection molding using, for example, polypropylene (PPF) mixed with a filler such as talc. The outer surface of the outer plate part 10 constitutes the design surface of the automobile hood CH.

The inner plate portion 20 has a flat plate shape and is disposed in a state of being substantially parallel to the outer plate portion 10 on the vehicle inner side than the outer plate portion 10.
Each partition wall 30 is formed in a low hexagonal cylindrical shape by a plurality (six) of partition portions 31 disposed between the outer plate portion 10 and the inner plate portion 20. The honeycomb part 32 is formed between the outer plate part 10 and the inner plate part 20 by providing a large number of hexagonal cylindrical partition walls 30 adjacent to each other. Adjacent partition walls 30 share one partition portion 31 in common. A honeycomb structure 33 is configured by the honeycomb portion 32 and the outer plate portion 10 and the inner plate portion 20 that sandwich the honeycomb portion 32 from both sides. A region surrounded by the outer plate part 10, the partition wall 30, and the inner plate part 20 is a low hexagonal column-shaped hollow part 34.

  The inner plate portion 20 and the plurality of partition walls 30 correspond to an inner panel in a general automobile hood formed entirely of metal. The inner plate portion 20 and the plurality of partition walls 30 are integrally formed by performing injection molding using, for example, polypropylene (CFPP) mixed with a carbon filler. Then, after the resin molding, the outer plate portion 10 is bonded and fixed to the partition wall 30.

  Like a general structure, the honeycomb structure 33 exhibits high strength by changing the force applied to the outer plate portion 10 and the inner plate portion 20 to bend them into a force for expanding and contracting the honeycomb portion 32. . The honeycomb structure 33 is characterized in that it has high rigidity (surface rigidity) and is not easily deformed.

  Each partition wall 30 is provided with a main absorption part 40 and a sub absorption part 50 as absorption parts that absorb energy when an external force directed toward the inside of the vehicle (engine room side) is applied through the outer plate part 10. . The main absorption part 40 and the sub absorption part 50 are provided at six locations of each partition wall 30.

  As shown in FIG. 2, each main absorbent portion 40 is provided in each partition portion 31 at a location different from the boundary portion with the adjacent partition portion 31, that is, in many portions of each partition portion 31. Each main absorbent portion 40 is arranged in a first-stage first absorbent portion 41 provided in the vicinity of the outer plate portion 10 and at a location on the vehicle inner side (inner plate portion 20 side) with respect to the first absorbent portion 41. It is comprised by the 2nd absorption part 43 provided in the state.

  More specifically, as shown in FIG. 3, the first absorption portion 41 of the main absorption portion 40 is configured by a plate-like outer fragile portion 42 extending from the outer plate portion 10 toward the inner plate portion 20. A surface 42 </ b> A on the vehicle outer side of the outer fragile portion 42 is an adhesive surface with the outer plate portion 10.

  The second absorption portion 43 of the main absorption portion 40 is constituted by a pair of inner weak portions 44 and a connection weak portion 45. The two inner fragile portions 44 each have a plate shape and extend from the inner plate portion 20 toward the outer plate portion 10 in a state of being separated from each other. The connecting weakened portion 45 extends in a direction perpendicular to the inner and outer directions of the automobile (the left-right direction in FIG. 3 and the direction perpendicular to the paper surface), and is connected to the inner end of the outer vulnerable portion 42 and the outer sides of the inner vulnerable portions 44. The end is connected.

  With the above configuration, in the main absorbent portion 40, the second absorbent portion 43 has higher strength than the first absorbent portion 41. Therefore, when an external force is applied to the automobile hood CH, in the main absorber 40, the first absorber 41 is first deformed to absorb energy, and then the second absorber 43 is deformed to further absorb energy. .

In addition, the boundary part of the outer weak part 42 and the connection weak part 45 is squared, and becomes a shape where stress tends to concentrate rather than the case where the same boundary part is formed in curved surface shape.
As shown in FIG. 2, each sub-absorbing part 50 is provided at each corner of the partition wall 30, in other words, a boundary part between adjacent partition parts 31. Each sub-absorbing part 50 is arranged in a first-stage first absorbing part 51 provided in the vicinity of the outer plate part 10, and at a location on the vehicle inner side (inner plate part 20 side) with respect to the first absorbing part 51. It is comprised by the 2nd absorption part 54 provided in the state.

  More specifically, as shown in FIG. 4, the first absorption portion 51 is configured by a substantially cylindrical outer fragile portion 52 extending from the outer plate portion 10 toward the inner plate portion 20. An end of the outer fragile portion 52 on the vehicle outer side is closed by a disc-shaped lid portion 53. A vehicle outer surface 53A of the lid portion 53 has a diameter R larger than a width W of the vehicle outer surface 42A of the outer fragile portion 42 (see FIG. 2), and is an adhesive surface with the outer plate portion 10. It is said that.

  The second absorption part 54 includes an inner weak part 55 and a connection weak part 56. The inner fragile portion 55 has a substantially cylindrical shape and extends from the inner plate portion 20 toward the outer plate portion 10. The diameter of the vehicle outer end portion of the inner fragile portion 55 is set larger than the diameter of the vehicle inner end portion of the outer fragile portion 52. The connecting weak part 56 has an annular shape in a plane orthogonal to the inner and outer directions of the automobile, and connects the inner end part of the outer weak part 52 and the outer end part of the inner weak part 55.

  Note that the outer fragile portion 52 and the inner fragile portion 55 are both increased in diameter toward the vehicle inner side (inner plate portion 20 side). This is because the mold is smoothly released from the outer fragile portion 52 and the inner fragile portion 55 after resin molding.

  With the above configuration, in the sub-absorption unit 50, the second absorption unit 54 has higher strength than the first absorption unit 51. Therefore, when an external force is applied to the automobile hood CH, in the sub-absorption unit 50, the first absorption unit 51 is deformed to absorb energy, and then the second absorption unit 54 is deformed to further absorb energy.

In addition, the boundary part of the outer weak part 52 and the connection weak part 56 is squared, and becomes a shape where stress tends to concentrate rather than the case where the same boundary part is formed in curved surface shape.
The outer plate part 10 is bonded and fixed to the main absorbent part 40 and the secondary absorbent part 50. Here, if only the main absorption part 40 is provided as the absorption part in the partition wall 30 (the sub absorption part 50 is not provided), the outer plate part 10 is in the outer fragile part 42 of the main absorption part 40. Only the adhesive will be fixed. However, the outer fragile portion 42 of the main absorbent portion 40 has a plate shape and is bonded to the outer plate portion 10 on the outer surface 42A of the vehicle, so that there is a limit to a wide bonding area. However, in addition to the main absorbent portion 40, the partition wall 30 is provided with a secondary absorbent portion 50 having an outer fragile portion 52, and the lid 53 of the outer fragile portion 52 is also bonded to the outer plate portion 10. It is. A surface 53A on the vehicle outer side of the lid portion 53 has a circular shape and is wider than the surface 42A of the outer fragile portion 42 in the main absorbent portion 40 (see FIG. 2). Therefore, since the cover portion 53 is added as a bonding target location, the bonding area of the outer plate portion 10 to the main absorbent portion 40 and the sub absorbent portion 50 is increased, and the outer plate portion 10 is added to the main absorbent portion 40 and the sub absorbent portion 50. On the other hand, it is more firmly bonded.

As described above, the automobile hood CH of the present embodiment is configured. Next, the operation of the automobile hood CH will be described with reference to FIGS. 5 and 6.
In the automobile equipped with the automobile hood CH of the present embodiment, when the pedestrian comes into contact with the pedestrian, the pedestrian may fall down and the head or the like may come into contact (collision) with the automobile hood CH. By this contact (collision), as shown in FIG. 5A, an external force F directed toward the inside of the automobile through the outer plate portion 10 is applied to the automobile hood CH. This external force F is transmitted to the inner plate portion 20 through the first absorption portion 41 and the second absorption portion 43 in the main absorption portion 40. In addition, as shown in FIG. 6A, the external force F is transmitted to the inner plate part 20 via the first absorption part 51 and the second absorption part 54 in the auxiliary absorption part 50.

  More specifically, as shown in FIG. 5 (A), in each main absorbent portion 40, the external force F is transmitted through a plate-like outer weak portion 42, a connecting weak portion 45, and a pair of plate-like inner weak portions 44. It is transmitted to the plate part 20.

  By the external force F transmitted in this way, first, the outer fragile portion 42 which is the first absorption portion 41 provided in the vicinity of the outer plate portion 10 is deformed, so that the contact energy is absorbed. The impact applied to the pedestrian from the car is alleviated. The deformation here includes bending of the outer fragile portion 42 as shown in FIG. As described above, the boundary portion between the outer fragile portion 42 and the connection fragile portion 45 is angular, and stress tends to concentrate on the boundary portion, so the outer fragile portion 42 is easily bent at this boundary portion.

  After the first absorption part 41 bends as described above and absorbs the energy of contact, that is, after the first absorption part 41 starts to be deformed, two steps provided on the inner plate part 20 side than the first absorption part 41. The connection weak part 45 and the both internal weak parts 44 which are the 2nd absorption parts 43 of eyes start a deformation | transformation. In the deformation here, as shown in FIG. 5 (C), the bent outer fragile portion 42 is broken at the inner end portion of the vehicle, breaks through the connecting fragile portion 45 and goes to the vehicle inner side with the outer plate portion 10. Includes moving. The deformation includes bending of the inner fragile portion 44 as shown by a two-dot chain line in FIG. This bending is performed by pressing the inner fragile portion 44 after the outer plate portion 10 moving to the vehicle inner side comes into contact with the second absorption portion 43 (the remaining portion of the connection weakened portion 45). It is. Due to the deformation of the second absorbing portion 43, the contact energy is further absorbed, and the impact applied to the pedestrian is further alleviated.

  Thus, even after the energy absorption by the first absorption part 41 is performed, the energy absorption by the second absorption part 43 is continued. Accordingly, more energy is absorbed than when only the first-stage energy absorption is performed. Accordingly, the impact on the pedestrian is reduced.

As shown in FIG. 6A, in each sub-absorption portion 50, the external force F is applied to the inner plate portion via the substantially cylindrical outer weak portion 52, the connecting weak portion 56, and the substantially cylindrical inner weak portion 55. 20 is transmitted.
By the external force F transmitted in this way, first, the outer fragile portion 52 which is the first absorption portion 51 provided in the vicinity of the outer plate portion 10 is deformed, so that the contact energy is absorbed. The impact applied to the pedestrian from the car is alleviated. The deformation here includes bending of the outer fragile portion 52 as shown in FIG. As described above, the boundary portion between the outer fragile portion 52 and the connection fragile portion 56 is angular, and stress tends to concentrate on the boundary portion, so the outer fragile portion 52 is easily bent at this boundary portion.

  After the first absorbing portion 51 is bent as described above and absorbs contact energy, that is, after the first absorbing portion 51 starts to be deformed, two steps provided on the inner plate portion 20 side with respect to the first absorbing portion 51. The connection weak part 56 and the internal weak part 55 which are the 2nd absorption parts 54 of eyes start a deformation | transformation. In the deformation here, as shown in FIG. 6 (C), the bent outer fragile portion 52 is broken at the inner end of the vehicle, breaks through the connecting fragile portion 56 and goes to the vehicle inner side with the outer plate portion 10. Includes moving. The deformation includes bending of the inner fragile portion 55 as shown by a two-dot chain line in FIG. This bending is performed by pressing the inner fragile portion 55 after the outer plate portion 10 moving to the vehicle inner side comes into contact with the second absorbing portion 54 (the remaining portion of the connecting fragile portion 56). It is. Due to the deformation of the second absorbing portion 54, the contact energy is further absorbed, and the impact applied to the pedestrian is further alleviated.

  As described above, the energy absorption by the second absorption part 54 is continued even after the energy absorption by the first absorption part 51 is performed. Accordingly, more energy is absorbed than when only the first-stage energy absorption is performed. Accordingly, the impact on the pedestrian is reduced.

Furthermore, the automobile hood CH of the present embodiment is lightweight by adopting the following configuration.
(I) The substantially entire automobile hood CH is formed of the honeycomb structure 33 (FIG. 1).

  (Ii) A honeycomb structure 33 includes a honeycomb portion 32 composed of a large number of partition walls 30 each having a hexagonal tubular shape, and an outer plate portion 10 and an inner plate portion 10 that sandwich the honeycomb portions 32 from both inside and outside the automobile and seal each partition wall 30. It is comprised by the board part 20 (FIG. 1).

  By making each partition wall 30 into a hexagonal cylindrical shape, the volume of the internal space (hollow part 34) becomes the maximum volume that can be taken, and the material of the partition wall 30 can be reduced. This leads to the honeycomb structure 33 becoming lighter.

(Iii) The outer plate part 10, the honeycomb part 32, and the inner plate part 20, which are constituent members of the honeycomb structure 33, are all formed of resin (FIG. 1).
From the above, the automobile hood CH of the present embodiment is lighter than a general metal automobile hood in which a metal inner panel is arranged on the vehicle inner side (engine room side) of the metal outer panel. Further, the automobile hood CH of the present embodiment is lighter in weight as compared with the substantially entire hood CH formed of a metal honeycomb structure.

According to the embodiment described in detail above, the following effects can be obtained.
(1) In an automobile hood CH (FIG. 1) including a partition wall 30 that defines a hollow portion 34 between the outer plate portion 10 and the inner plate portion 20. As an absorption part that absorbs energy when an external force F directed toward the direction is applied, first-stage first absorption parts 41 and 51 and second-stage second absorption parts 43 and 54 are arranged in the inner and outer directions of the vehicle. Provide in the state. The first absorbers 41 and 51 and the second absorbers 43 and 54 are deformed by the first absorbers 41 and 51 according to the external force F to absorb energy, and the second absorbers 43 and 54 are absorbed by the first absorber 41. , 51 is formed so as to absorb the energy by starting the deformation (FIGS. 5 and 6).

  Therefore, even after the energy absorption by the first absorption parts 41 and 51 is performed, the energy absorption by the second absorption parts 43 and 54 is continued and only the first-stage energy absorption is performed (Patent Document 1 corresponds to this). More energy can be absorbed. Energy absorption performance can be improved and the impact applied to pedestrians can be further reduced.

  (2) The first absorbers 41 and 51 and the second absorbers 43 and 54 are formed in a form in which the second absorbers 43 and 54 are deformed and absorb energy after energy absorption by the first absorbers 41 and 51. (FIGS. 5 and 6).

  Therefore, energy can be absorbed over a longer period than when energy absorption by the second absorption units 43 and 54 is started in the middle of energy absorption by the first absorption units 41 and 51.

(3) The first absorption portions 41 and 51 are provided in the vicinity of the outer plate portion 10, and the second absorption portions 43 and 54 are provided on the inner plate portion 20 side of the first absorption portion 41 (FIGS. 3 and 4). ).
Therefore, the first absorbing portions 41 and 51 and the second absorbing portions 43 and 54 are sequentially deformed from the outer plate portion 10 toward the inner plate portion 20 to absorb the contact energy in order, and the impact applied to the pedestrian is sequentially increased. Can be relaxed.

  (4) As an absorption part that absorbs contact energy, the main absorption part 40 is provided in a part different from the boundary part with the adjacent partition part 31 in the partition part 31, that is, in many parts of each partition part 31 ( Figure 2). The first absorption portion 41 of the main absorption portion 40 is configured by a plate-like outer fragile portion 42 extending from the outer plate portion 10 toward the inner plate portion 20. The second absorption portion 43 of the main absorption portion 40 is formed in a plate shape and is separated from each other and extends from the inner plate portion 20 toward the outer plate portion 10 in the inner and outer directions of the automobile. It extends in a direction orthogonal to each other, and is constituted by a connection weakened portion 45 that connects an end portion on the inner side of the outer fragile portion 42 and an end portion on the outer side of each inner fragile portion 44 (FIG. 3).

  Therefore, in each main absorption part 40, by first deforming (bending) the outer fragile part 42, energy of contact is absorbed, and thereafter, the connecting fragile part 45 and both inner fragile parts 44 are deformed (broken, By bending), energy can be further absorbed.

  (5) As a contact energy absorbing portion, a sub-absorbing portion 50 is provided at a boundary portion between adjacent partition portions 31 (FIG. 2). The first absorption portion 51 of the sub absorption portion 50 is configured by a substantially cylindrical outer fragile portion 52 extending from the outer plate portion 10 toward the inner plate portion 20. The second absorbing portion 54 is formed in a substantially cylindrical shape having a larger diameter than the outer fragile portion 52 and extends from the inner plate portion 20 toward the outer plate portion 10 on a surface orthogonal to the inner and outer directions of the automobile. It has an annular shape, and is constituted by a connection weakened portion 56 that connects an end portion on the inner side of the outer fragile portion 52 and an end portion on the outer side of the inner fragile portion 55 (FIG. 4).

  Therefore, in each of the sub-absorption parts 50, first, the outer fragile part 52 is deformed (bent) to absorb contact energy, and thereafter, the connecting fragile part 56 and the inner fragile part 55 are deformed (broken and bent). ) To further absorb energy.

  (6) Although related to the above (5) and (6), the first absorption portion 41 of the main absorption portion 40 is configured by a plate-like outer fragile portion 42 extending from the outer plate portion 10 toward the inner plate portion 20. (FIG. 3). The first absorption portion 41 of the sub-absorption portion 50 is formed in a substantially cylindrical shape and extends from the outer plate portion 10 toward the inner plate portion 20, and the end portion on the outer side of the vehicle is blocked by the disc-like lid portion 53. The outer fragile portion 52 is configured (FIG. 4). The outer plate portion 10 is bonded and fixed to a vehicle outer surface 42A of the outer weak portion 42 in the main absorbent portion 40 and a vehicle outer surface 53A of the lid portion 53 in the sub absorbent portion 50.

Therefore, the adhesion area of the outer plate portion 10 to the main absorbent portion 40 and the sub absorbent portion 50 can be expanded, and the outer plate portion 10 can be more firmly adhered to the main absorbent portion 40 and the sub absorbent portion 50.
(7) All of the outer plate part 10, the partition wall 30, and the inner plate part 20, which are members constituting the automobile hood CH, are formed of resin.

  Therefore, the automobile hood CH can be made lighter than that in which at least one of the outer plate portion 10, the partition wall 30, and the inner plate portion 20 is formed of metal. Further, since the hollow portion 34 is formed by the outer plate portion 10, the partition wall 30, and the inner plate portion 20, the automobile hood CH can be further reduced in weight. Such weight reduction makes it possible to reduce the energy required to operate the automobile and improve the fuel efficiency of the automobile.

In addition, the said embodiment can also be implemented as a modification which changed this as follows.
<About partition wall 30>
The partition wall 30 may be formed in a polygonal cylinder shape other than the hexagonal cylinder shape.

-Each side in the opening of the partition 30 may not be uniform. For example, this is a flat hexagonal cylinder (when only one set of opposite sides is longer than the other set of opposite sides).
-If the contact location with the pedestrian of the automobile food hood CH is a location that is far away from the automobile components arranged in the engine room, when an external force is applied, the first absorption portions 41 and 51 and the second absorption portion In addition to the deformation of 43 and 54, the energy of contact is also absorbed by the outer plate 10 being bent toward the vehicle interior (engine room side). The amount of energy absorption due to deformation of the first absorption portions 41 and 51 and the second absorption portions 43 and 54 can be reduced by the amount of energy absorption due to the bending of the outer plate portion 10. Therefore, even if each partition 30 is formed to be larger than the narrow space at the location where the space between the vehicle components is wide, the outer plate portion 10 bends and the first absorption portions 41 and 51 and the second absorption portion. The energy of contact is absorbed without causing interference with the automobile components, both by the deformation of 43 and 54.

  Moreover, if the contact location with the pedestrian of the outer plate | board part 10 is a location close | similar to the vehicle structural member in an engine room, when external force is added, the space which the outer plate | board part 10 can bend is narrow. The amount of energy that can be absorbed by the outer plate 10 being bent toward the engine room is reduced. Accordingly, the amount of energy to be absorbed increases as the first absorption parts 41 and 51 and the second absorption parts 43 and 54 are deformed.

  In view of this, it is desirable that the partition wall 30 be formed to be smaller in the portion where the distance between the automobile hood CH and the vehicle constituent member is narrower than the portion where the distance is wide. In this way, energy is absorbed without incurring interference with the automobile components by deforming many small partition walls 30. It is possible to achieve weight reduction and improved energy absorption performance at a higher level.

  For example, when the interval between the pair of partition portions 31 facing each other across the central axis of the hollow portion 34 in each partition wall 30 is defined as the pitch of the partition walls 30, the pitch can be changed to change the size of each partition wall 30. Can be changed. For example, the partition wall 30 can be made smaller by reducing the pitch, and the partition wall 30 can be made larger by increasing the pitch.

<About the absorber>
-In the main absorption part 40 and the sub absorption part 50, although the 1st absorption part 41,51 and the 2nd absorption part 43,54 are essential, in addition to these, after a deformation | transformation start of the 2nd absorption part 43,54, Desirably, one or more steps of another absorption part which starts a deformation | transformation after a deformation | transformation may be provided.

  The first absorption parts 41 and 51 and the second absorption parts 43 and 54 are deformed by the first absorption parts 41 and 51 according to the external force F to absorb energy, and the second absorption parts 43 and 54 are the first absorption parts. What is necessary is just to start a deformation | transformation after the deformation | transformation start of 41 and 51, and to absorb energy.

  Accordingly, the first absorption parts 41 and 51 and the second absorption parts 43 and 54 are designed so that the second absorption parts 43 and 54 start to deform before the energy absorption by the first absorption parts 41 and 51 is finished. You may form in the form to absorb.

-Either one of the main absorption part 40 and the sub absorption part 50 may be omitted.
Contrary to the above embodiment, the second absorption parts 43 and 54 are provided on the outer plate part 10 side (vehicle outer side), and the first absorption parts 41 and 51 are provided on the inner plate part 20 side (vehicle inner side). May be. In this case, the first absorption parts 41 and 51 and the second absorption parts 43 and 54 absorb energy by the second absorption parts 43 and 54 starting to deform after the energy absorption by the first absorption parts 41 and 51. It is necessary to form in the form to do.

A slit may be formed in at least one of the first absorption parts 41 and 51 and the second absorption parts 43 and 54. Examples are shown in FIGS. 7A and 7B and FIGS. 8A and 8B.
7A and 7B show an example in which a slit 46 is formed in the main absorbent portion 40. FIG. The slit 46 is formed in the connection weakened portion 45 and the inner weakened portion 44 constituting the second absorbing portion 43. The slit may be formed at a location different from the above of the main absorbent portion 40, for example, the outer fragile portion 42.

  8A and 8B show an example in which slits 57 and 58 are formed in the sub-absorption portion 50. FIG. The slit 57 is formed in the first absorption part 51 (outer fragile part 52), and the slit 58 is formed in the second absorption part 54 (inner fragile part 55). Only one of the slits 57 and 58 may be formed. The slit may be formed across the first absorption part 51 (outer fragile part 52) and the second absorption part 54 (inner fragile part 55).

If it does in this way, the intensity | strength of the 1st absorption parts 41 and 51 and the 2nd absorption parts 43 and 54 will fall because slits 46, 57, and 58 are formed.
Along with this, the second absorption part 43 in which the slit 46 is formed is easily deformed, and the amount of energy that can be absorbed by the main absorption part 40 is different from that in which the slit 46 is not formed.

  Further, the first absorbing portion 51 and the second absorbing portion 54 in which the slits 57 and 58 are formed are easily deformed, and the amount of energy that can be absorbed by the auxiliary absorbing portion 50 is not formed in the slits 57 and 58. Things are different.

  Therefore, by appropriately forming the slits 46, 57, 58, it is possible to easily adjust the energy absorption performance of the automobile hood CH. The slits 46, 57, 58 are formed while maintaining the basic structure composed of the first absorption parts 41, 51 and the second absorption parts 43, 54 even if the energy absorption performance required for each type of automobile is different. This can be handled easily.

Moreover, the thing in which the slits 46, 57, and 58 were formed among the 1st absorption parts 41 and 51 and the 2nd absorption parts 43 and 54 becomes lightweight compared with the thing in which a slit is not formed.
At least one of the first absorption part 51 (outer fragile part 52) and the second absorption part 54 (inner fragile part 55) in the auxiliary absorption part 50 is formed in a non-cylindrical shape, for example, an elliptical cylindrical shape, a polygonal cylindrical shape, or the like. May be.

<About the honeycomb structure 33>
The vehicle hood CH may be formed substantially entirely by the honeycomb structure 33 or only partially by the honeycomb structure 33. For example, only the central part of the automobile hood CH and its vicinity, the vicinity of the hood hinge, and the vicinity of the rear edge part sandwiched between the left and right hood hinges may be formed by the honeycomb structure 33.

  The outer plate 10 may be formed integrally with the partition wall 30 instead of the inner plate 20. In this case, the inner plate portion 20 may be molded separately from the partition wall 30 and may be fixed to the partition wall 30 by a bonding means such as adhesion after the molding.

  A sound absorbing material for reducing the sound generated by the engine may be laminated on the inner plate part 20. As the sound absorbing material, for example, a fiber material such as glass wool, a foamed resin such as urethane foam, or the like can be used.

  The material of the constituent member of the honeycomb structure 33 is energy absorption by deformation of the first absorption parts 41 and 51 and the second absorption parts 43 and 54 from a heat-resistant resin material that can withstand the temperature in the engine room. It is desirable to select and use the characteristics appropriately in consideration of the ease of setting the characteristics, the handleability, and the cost.

  From such a viewpoint, a fiber reinforced resin may be used as the material. Examples of the fiber reinforced resin include a composite material containing a synthetic resin such as PP, PA, or PET as a base material, and a fiber such as carbon fiber or glass fiber having a relatively short fiber length as a reinforcing material.

The outer plate part 10 may be fixed to the partition wall 30 (the main absorbent part 40 and the secondary absorbent part 50) by a joining means different from adhesion, for example, welding.
<Others>
The automobile exterior product can be applied to an exterior product, for example, a front fender, which is a front part of a vehicle body and requires pedestrian protection by impact relaxation, in addition to the automobile hood CH.

DESCRIPTION OF SYMBOLS 10 ... Outer plate part, 20 ... Inner plate part, 30 ... Partition, 31 ... Partition part, 34 ... Hollow part, 40 ... Main absorption part, 41, 51 ... First absorption part, 42 ... Outer weak part (outer main weak part) Part), 52 ... outer vulnerable part (outer auxiliary weak part) , 42A, 53A ... surface, 43,54 ... second absorbing part, 44 ... inner vulnerable part (inner main vulnerable part), 55 ... inner vulnerable part (inner auxiliary part) Fragile part) , 45 ... connected weak part (linked main weak part), 56 ... connected fragile part (linked auxiliary agent weak part) , 46, 57, 58 ... slit, 50 ... secondary absorbent part, 53 ... lid part, CH ... Automotive hood (automobile exterior), F ... external force.

Claims (3)

An outer plate portion having an outer surface as a design surface, an inner plate portion disposed on the vehicle inner side than the outer plate portion, and a partition wall that partitions and forms a hollow portion between the outer plate portion and the inner plate portion. An automotive exterior product comprising:
The partition includes at least a first absorption part and a second absorption part of the second stage as an absorption part that absorbs energy when an external force inward of the automobile is applied through the outer plate part. It is provided in a state of being lined up inside and outside the car,
In the first absorption unit and the second absorption unit, the first absorption unit is deformed and absorbs energy according to the external force, and the second absorption unit starts to deform after energy absorption by the first absorption unit. To form a form that absorbs energy,
The first absorption part is provided in the vicinity of the outer plate part, and the second absorption part is provided on the inner plate part side of the first absorption part,
The second absorption part has higher strength than the first absorption part,
The partition is formed into a polygonal cylinder by a plurality of partitions,
A part of the first absorption part and a part of the second absorption part constitute a main absorption part provided at a location different from a boundary part with an adjacent partition part in the partition part,
The main absorbent portion includes, as the first absorbent portion, a plate-like outer main fragile portion extending from the outer plate portion toward the inner plate portion, and as the second absorbent portion, a plate shape, respectively. A pair of inner main fragile portions extending from the inner plate portion toward the outer plate portion in a state of being separated from each other, and an inner side of the outer main fragile portion extending in a direction orthogonal to the inner and outer directions of the automobile. A connecting main fragile portion that connects the end portion of the inner main fragile portion and the outer end portion of the inner main fragile portion,
A part of the first absorption part and a part of the second absorption part constitute a sub-absorption part provided at a boundary part of adjacent partition parts,
The sub-absorbing portion is an outer sub-fragile portion having a cylindrical shape extending from the outer plate portion toward the inner plate portion as the first absorbing portion, and having an outer end portion closed by a lid portion. An inner sub-fragile portion extending from the inner plate portion toward the outer plate portion as the second absorption portion and having a larger diameter than the outer sub-fragile portion; An annular surface is formed in a plane orthogonal to the direction, and includes a connecting sub weak portion connecting the vehicle inner end portion of the outer sub weak portion and the vehicle outer end portion of the inner sub weak portion,
The automobile is characterized in that the outer plate portion is bonded and fixed to a vehicle outer surface of the outer main fragile portion in the main absorbent portion and a vehicle outer surface of the lid portion in the sub absorbent portion. Exterior product. The automotive exterior product according to claim 1 , wherein a slit is formed in at least one of the first absorption portion and the second absorption portion. The automotive exterior product according to claim 1 or 2 , wherein at least one of the outer plate portion, the partition wall, and the inner plate portion is formed of a resin.