JP2014105818A - Impact energy absorbing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact energy absorbing member capable of enhancing energy absorption efficiency with respect to impact load.SOLUTION: An impact energy absorbing member 1 includes a plurality of truncated pyramid-shaped projections 2 whose base part has a polygonal shape. The projections 2 are respectively coupled to the adjacent projection 2 by coupling pieces 5 radially extending from base sides 4a of the base part. The projections 2 are disposed to form a radial shape.

Description

  The present invention relates to an impact energy absorbing member that absorbs an impact force at the time of a vehicle collision, for example.

  As this type of impact energy absorbing member, for example, in Patent Documents 1 and 2, a resin molded body 12 having a U-shaped cross section having a top plate and a pair of leg walls formed following the top plate is zigzag-shaped. The thing of the structure formed continuously so that it becomes is disclosed. For example, the impact energy absorbing member can be disposed in a ceiling portion or a pillar portion of an automobile to absorb an impact force when an occupant collides with the ceiling portion or the pillar portion at the time of a vehicle collision.

JP 2006-27375 A JP 2000-21454 A

  By the way, the conventional impact energy absorbing member adopts a structure that absorbs an impact load applied to the top plate by bending or buckling deformation of a pair of leg walls. The bending deformation may not be stable, and there is a concern that a stable energy absorption effect cannot be obtained, and there is room for improvement in this respect.

  The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to provide an impact energy absorbing member capable of enhancing energy absorption efficiency with respect to an impact load.

  The invention of claim 1 is provided with a plurality of pyramidal or truncated pyramid-shaped projections whose base is polygonal, and the projections are adjacent to each other by connecting pieces extending radially from the bases of the base. The impact energy absorbing member is characterized in that the projections are arranged in a radial pattern.

The invention of claim 2 is the impact energy absorbing member according to claim 1,
The impact energy absorbing member extends so that each side piece of the pyramid or truncated pyramid forms a radial shape starting from the apex or top surface of each projection, and the connecting piece starts from the side piece. It has an unfolded shape extending radially, and is formed by bending each side piece and each connecting piece.

The invention of claim 3 is the impact energy absorbing member according to claim 1 or 2,
In the portion surrounded by the connecting piece of each protrusion, a second protrusion having a height lower than that of each protrusion is integrally formed.

The invention of claim 4 is the impact energy absorbing member according to claim 3,
The protruding portion has a protruding portion that protrudes from the pyramid-shaped or truncated pyramid-shaped ridge line and is opposed to the second protruding portion.

  According to the impact energy absorbing member of the first aspect of the present invention, a plurality of pyramid-shaped or truncated pyramid-shaped projections are provided, and the projections are adjacent to each other by connecting pieces extending radially from the bottom of the base. The protrusions are arranged in a radial pattern.

  With this configuration, the impact load applied to the protrusion is transmitted to the side pieces of the pyramid or the truncated pyramid, so that each side piece is buckled and then bent by being transmitted from each side piece to each connecting piece. Deformation will be induced, and it will be transmitted radially to each projection via each connecting piece. Thus, the impact load can be distributed and transmitted over a wide range, a stable energy absorption effect can be obtained, and the energy absorption efficiency can be increased. Since the energy absorption efficiency can be increased in this way, it is possible to reduce the plate thickness of the impact energy absorbing member, and it is possible to reduce the weight and cost accordingly.

  According to a second aspect of the present invention, each side piece extending radially from the apex or top surface of each projection and the connecting piece extending radially from each side piece are bent. Since the impact energy absorbing member is formed by the above, the impact energy absorbing member can be manufactured easily and at low cost by punching the developed shape from the metal plate by press working and bending the side piece and the connecting piece.

  In addition, since the protrusions are formed by bending each side piece and each connecting piece, the followability of the protrusions to the curved surface is high. be able to. Furthermore, since the connecting piece is radially developed starting from each side piece, it is easy to induce bending deformation to the connecting piece.

  In the invention of claim 3, since the second projection part having a height lower than the projection part is formed in the part surrounded by the connecting piece of each projection part, the impact load is applied to the projection part and the second part. It is possible to absorb in two stages with the protrusions, and energy absorption efficiency can be further enhanced.

  In the invention of claim 4, since the protrusion is formed so as to protrude from the pyramid-shaped or truncated pyramid-shaped ridge line and to face the second protrusion, the impact load is higher than the protrusion of the protrusion. This portion, the protrusion, the portion below the protrusion of the protrusion, and the second protrusion can absorb in steps, and energy absorption efficiency can be further increased.

It is a perspective view of the impact energy absorption member which concerns on Example 1 of this invention. It is a top view of the said impact energy absorption member. It is sectional drawing (III-III sectional view taken on the line of FIG. 2) of the said impact energy absorption member. It is an enlarged plan view of the protrusion part of the said impact energy absorption member. It is an expanded view of the said impact energy absorption member. It is a perspective view of the impact energy absorption member which concerns on Example 2 of this invention. It is sectional drawing of the said impact energy absorption member. It is an expanded view of the said impact energy absorption member. It is a characteristic view which shows the energy absorption effect of the impact energy absorption member which concerns on the said Example 2.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 4 are diagrams for explaining an impact energy absorbing member according to Embodiment 1 of the present invention. In the present embodiment, an impact energy absorbing member disposed on the ceiling of an automobile will be described as an example.

  In the figure, reference numeral 1 denotes an impact energy absorbing member disposed on the ceiling of the automobile. The impact energy absorbing member 1 has a structure in which a large number of projecting portions 2 having a truncated pyramid shape are integrally connected to adjacent projecting portions 2 and the projecting portions 2 are arranged so as to form a radial shape. Has the following structure.

  As shown in FIG. 4, each of the protrusions 2 includes a top surface 3 having a regular hexagonal shape, and six side pieces 4 bent downward so as to follow each side 3 a of the top surface 3. Yes.

  The base of each protrusion 2 has a hexagonal shape similar to the top surface 3, and a connecting piece 5 is integrally formed on each base 4 a of the bottom so that each connecting piece 5 Each of the protrusions 2 is integrally connected to an adjacent protrusion. As a result, the protrusions 2 are arranged radially from any one protrusion 2 ′ (see FIG. 2).

  As shown in FIG. 5, the impact energy absorbing member 1 extends from the top surface 3 of each projection 2 so that each side piece 4 forms a radial shape, and each side piece 4 further extends. The adjacent protrusions 2 are connected in a radial manner by the connecting piece 5 that follows. Each protrusion 2 is formed by punching out the developed shape from a single metal plate by pressing and bending each side piece 4 and each connecting piece 5 at the side 3a and the bottom 4a. Is.

  As shown in FIG. 3, the impact energy absorbing member 1 is fixed to a roof rein hose 8 disposed in the ceiling portion 7 of the automobile, and an interior member is disposed on the inner side of the roof rein hose 8. 9 is arranged to face each top face 3 with a predetermined gap.

  The connecting piece 5 of the impact energy absorbing member 1 is fixed to the roof rein hose 8 by welding or with an adhesive. In this case, the impact energy absorption performance can be adjusted by appropriately setting the number of connecting pieces 5 to be fixed and the positions of the connecting pieces 5 to be fixed. For example, when all the connecting pieces 5 are fixed, the bending rigidity, torsional rigidity, and consequently the buckling resistance of the energy absorbing member 1 are maximum values. On the other hand, when the number of connecting pieces 5 to be fixed is reduced, the energy absorbing member 1 is buckled and deformed by a compressive load, and changes to a bending deformation to return to the original deployed state. Decreases, and the bending and torsional rigidity of the energy absorbing member 1 also decreases.

  In this way, by appropriately setting the number and position of fixing of the connecting piece 5 to the roof rein hose 8, the energy absorption characteristics with respect to the compressive load in all the longitudinal, lateral and oblique directions of the energy absorbing member 1, bending In addition, the torsional rigidity can be arbitrarily set.

  As shown in FIG. 3, when a compressive load P is applied to the impact energy absorbing member 1 through the interior member 9 due to a passenger in the vehicle interior colliding with the interior member 9 at the time of a vehicle collision, the compressive load P is 3 is transmitted to each side piece 4 so that each side piece 4 is buckled and deformed as indicated by a two-dot chain line, and is also transmitted from each side piece 4 to each connecting piece 5 to induce bending deformation. By this, it is absorbed by transmitting radially to each projection part 2 via each connecting piece 5. In this way, the influence on the occupant at the time of the vehicle collision can be suppressed.

  As described above, according to the present embodiment, the protrusions 2 each having the hexagonal top surface 3 and the side pieces 4 extending following the top surface 3 are connected to the bases 4 a of the side pieces 4. Since they are arranged radially by being integrally connected by the connecting piece 5, the compressive load P applied to the top surface 3 is transmitted from the top surface 3 to each side piece 4 as described above. The piece 4 is buckled and deformed, and then is transmitted from each side piece 4 to each connecting piece 5 to induce bending deformation. Further, the piece 4 is absorbed by being transmitted radially to each projection 2 via each connecting piece 5. The impact on passengers is suppressed.

  Thus, the compressive load P can be dispersed and transmitted over a wide range, a stable energy absorption effect can be obtained, and the energy absorption efficiency can be increased. Further, since the energy absorption efficiency can be increased, it is possible to reduce the plate thickness of the impact energy absorbing member 1, and it is possible to reduce the weight and the cost accordingly.

  In the present embodiment, the impact energy absorbing member 1 extends from the top surface 3 of each projection 2 so that each side piece 4 forms a radial shape, and the connecting piece 5 starts from each side piece 4 to form a radial shape. Since it has an unfolded shape extending so as to form, the unfolded shape can be easily punched from one metal plate, and the impact energy absorbing member 1 can be formed by bending each side piece 4 and each connecting piece 5. It can be easily formed at low cost. In addition, since drawing is not necessary, it is possible to reduce the cost for equipment costs and the like.

  Since the projections 2 are formed by bending the side pieces 4 and the connection pieces 5, the projections 2 have high followability with respect to curved surfaces, and the impact even when the roof rein hose 8 is curved. The energy absorbing member 1 can be easily attached. Further, since the top surface 3 and the side pieces 4 are used as starting points, the joint piece 5 is easily induced to bend.

  In addition, although the said Example demonstrated the case where the impact energy absorption member 1 was arrange | positioned in the ceiling part of a motor vehicle, the application range of this invention is not restricted to this. For example, the impact energy absorbing member may be disposed in a pillar portion, an instrument panel, a console box, a bumper, or the like of an automobile. In short, the impact energy to the passenger or pedestrian should be absorbed at the time of a vehicle collision. If it exists, it may be disposed in any part, and in this case, the same effect as in the above embodiment can be obtained.

  6 to 8 are diagrams for explaining an impact energy absorbing member according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

  The impact energy absorbing member 1 of this embodiment has a structure in which a large number of projecting portions 2 having a truncated pyramid shape are integrally connected and arranged so as to form a radial shape. The basic structure is the same as that of the first embodiment. Since they are substantially the same, only different parts will be described.

  A triangular projection-shaped second projection 12 having a smaller height and diameter than the projection 2 is formed integrally with the triangular portion surrounded by the connecting piece 5 of each projection 2.

  The second projecting portion 12 has three side pieces 13 that stand up and extend upward after the connecting pieces 5 and a top surface 14 that connects the side pieces 13 together. The height of the top surface 14 of the second projecting portion 12 is set to a height of about ½ of the height to the top surface 3 of the projecting portion 2.

  More specifically, a triangular pyramid-shaped projecting portion 15 projecting outward is integrally formed between the adjacent side pieces 4 and 4 at the ridge line portion of the truncated pyramid of each projection portion 2. Yes. The lower surface of each protrusion 15 is located between the top surface 3 of the protrusion 2 and the top surface 14 of the second protrusion 12, and is on the top surface 14 of the second protrusion 12. It is opposed to be able to contact with a predetermined gap.

  In this embodiment, since the protrusion 2 located at the highest position, the protrusion 15 positioned at the middle in the vertical direction, and the second protrusion 12 positioned at the lowest position are provided, the compressive load P is set. It can be absorbed in 3 stages. That is, when the compressive load P is applied, the projecting portion 2 is buckled and deformed and receives a bending load. Subsequently, each projecting portion 15 of the projecting portion 2 spreads left and right, and the top surface 14 of the second projecting portion 12. When the compressive load P is further applied, the second projecting portion 12 is buckled and deformed while the projecting portion 15 is buckled and deformed.

  That is, as shown in FIG. 9, first, the upper portion of the protrusion 2 is buckled and deformed, so that a part P1 of the compressive load P is absorbed, and then the lower and second protrusions from the protrusion 15 of the protrusion 2. When the 12 is buckled and deformed, the remaining part P2 of the compression load P is absorbed, and the compression load P is absorbed as a whole.

  As described above, in this embodiment, various deformation modes are entangled with time, so that the compressive load from the initial stage to the late stage can be surely absorbed, and the energy absorption efficiency can be greatly improved. For this reason, the energy absorption efficiency per unit mass is greatly improved, the plate thickness of the energy absorbing member can be further reduced, and the weight reduction and cost reduction can be further promoted.

  Here, in the present invention, the projecting portion 15 does not necessarily have to be provided. When the projecting portion 15 is not provided, the compressive load P is first absorbed by buckling deformation of the upper portion of the projecting portion 2, and subsequently 2 by buckling deformation of the lower portion of the projecting portion 2 and the second projecting portion 12. Can be absorbed in stages.

  In the above-described embodiment, the case where each protrusion 2 is a truncated pyramid having the top surface 3 has been described. However, the protrusion according to the present invention may be formed of a pyramid having an apex.

DESCRIPTION OF SYMBOLS 1 Impact energy absorption member 2 Protrusion part 3 Top surface 4 Side piece 5 Connection piece 12 2nd protrusion part 15 Protrusion part

Claims (4)

Provided with a plurality of pyramidal or truncated pyramidal protrusions whose base is polygonal,
The protrusions are connected to adjacent protrusions by connecting pieces extending radially from the bases of the bottom part, and the protrusions are arranged so as to form a radial shape. . The impact energy absorbing member according to claim 1,
The impact energy absorbing member extends so that each side piece of the pyramid or truncated pyramid forms a radial shape starting from the apex or top surface of each projection, and the connecting piece starts from the side piece. It has a deployed shape that extends radially,
An impact energy absorbing member characterized by being formed by bending each side piece and each connecting piece. The impact energy absorbing member according to claim 1 or 2,
The impact energy absorbing member, wherein a second protrusion having a lower height than each protrusion is integrally formed in a portion surrounded by the connecting piece of each protrusion. The impact energy absorbing member according to claim 3,
The impact energy absorbing member, wherein the protrusion has a protrusion that protrudes from the pyramid-shaped or truncated pyramid-shaped ridge line and is opposed to the second protrusion.

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