JP2015124784A - Impact energy absorption member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact energy absorption member which can prevent a bounce of an initial load and a variation of a deformation mode, can secure an energy absorption stroke, and can obtain a stable energy absorption function.SOLUTION: An impact energy absorption member has a one-end side 3b intersecting with a load input direction F, and the other end side 3c substantially parallel with the one-end side 3b, and comprises a plurality of continuous plate-shaped absorption bodies 3, 3 .. via boundary lines B extending substantially in parallel with the load input direction. In the plate-shaped absorption body 3, there are formed a plurality of bead parts 4 at intervals in boundary line directions so that the bead parts have prescribed inclination angles θ with respect to the boundary lines B, and are formed into V-shapes with the boundary lines B as symmetric axes. The V-shaped bead part 4 is constituted of the longest bead part 4a at which an apex of a V-shape contacts with the one-end side 3b or the other end side 3c of the plate-shaped absorption body 3, and a plurality of gradually-shortened bead parts 4b to 4e whose bead lengths gradually become short as progressing toward the other end side 3c side or the one-end side 3b side from the longest bead part 4a.

Description

  The present invention relates to an impact energy absorbing member that absorbs an impact force when a passenger collides with a vehicle interior member during a vehicle collision, for example.

  As this type of impact energy absorbing member, for example, in Patent Document 1, a plurality of cylindrical bodies are continuously formed integrally, and each cylindrical body is buckled and deformed when a compressive load is applied. A structure which absorbs a compressive load is disclosed.

JP-A-9-150692

  By the way, when it is set as the structure which integrally forms a some cylindrical body like the said conventional energy absorption member, the rigidity of the whole energy absorption member tends to become excessive. For this reason, there is a possibility that the initial load greatly jumps before buckling deformation, the variation of the deformation mode may occur, and a sufficient energy absorption stroke cannot be secured, and a stable energy absorption function cannot be obtained. The problem is concerned.

  The present invention has been made in view of the above-described conventional circumstances, can prevent the initial load from jumping up and variations in the deformation mode, can ensure the energy absorption stroke, and thus can obtain a stable energy absorption function. It is an object to provide an impact energy absorbing member.

The invention of claim 1 is an impact energy absorbing member that absorbs an impact load by buckling deformation in the load input direction,
A plurality of plate-like absorbers having one end side intersecting with the load input direction and the other end side substantially parallel to the one end side and continuing through a boundary line extending substantially parallel to the load input direction;
In the plate-like absorber, a plurality of bead portions have a predetermined inclination angle with respect to the boundary line, and are further formed in a V shape having the boundary line as an axis of symmetry. Formed at intervals,
The V-shaped bead portion includes a longest bead portion in which a V-shaped apex is in contact with one end side or the other end side of the plate-like absorbent body, and a bead extending from the longest bead portion toward the other end side or one end side. It is characterized by being constituted by a plurality of gradually decreasing bead portions whose length is sequentially shortened.

The invention of claim 2 is the impact energy absorbing member according to claim 1,
One end side and the other end side of the plate-shaped absorbent body are inclined from one boundary line to the other boundary line of the plate-shaped absorbent body, and the plurality of plate-shaped absorbent bodies have a cylindrical shape. It is characterized by becoming the cylindrical absorber wound so.

  According to the impact energy absorbing member of the invention of claim 1, a plurality of bead portions are formed in the plate-like absorber so as to form a V shape with the boundary line as the axis of symmetry, and the V-shaped bead portion. Is composed of a longest bead portion where a V-shaped apex is in contact with one end side of the plate-like absorber, and a plurality of gradually decreasing bead portions whose bead lengths are gradually shortened from the longest bead portion toward the other end side. Therefore, the initial impact load is absorbed by the buckling deformation of the longest bead part, and the middle and late impact loads are caused by the buckling deformation of the gradually decreasing bead part with a long bead following the longest bead part. Will be absorbed.

  Thus, in the present invention, buckling deformation shifts in order from the longest bead portion to each gradually decreasing bead portion, so that it is possible to efficiently absorb the entire area impact load from the initial stage to the late stage, and to change the deformation mode of the energy absorber. A constant energy absorption function can be obtained.

  Moreover, since the energy absorption characteristic of impact energy can be adjusted by changing the interval of the bead parts or the number of installations, the required energy absorption stroke can be secured, and the target energy absorption characteristic can be obtained easily and reliably. .

  Further, in the invention of claim 2, since the one end side and the other end side of the plate-like absorber are inclined and the plate-like absorber is wound into a cylindrical shape, the impact energy absorbing member Can be installed in a stable state more securely in accordance with the input direction of the impact load, and the impact energy can be absorbed more reliably.

It is a perspective view of the impact energy absorption member by Example 1 of this invention. It is sectional drawing (II-II sectional view taken on the line of FIG. 1) of the said impact energy absorption member. FIG. 3 is a development plan view of the impact energy absorbing member. It is a block diagram which shows the usage example of the said impact energy absorption member. It is a schematic diagram which shows the buckling deformation state of the said impact energy absorption member. It is a cross-sectional top view of the impact energy absorption member by Example 2 of this invention. It is a cross-sectional top view of the modification of the impact energy absorption member of the said Example 2.

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

  1 to 5 are views for explaining an impact energy absorbing member according to Embodiment 1 of the present invention. In this embodiment, for example, an impact energy absorbing member disposed in a roof portion, a pillar portion, a door portion or the like of an automobile will be described as an example.

  In the figure, reference numeral 1 denotes an impact energy absorbing member including a cylindrical tubular absorber 2 that absorbs an impact force F at the time of a vehicle collision by buckling deformation in an axis A direction (load input direction). . This cylindrical absorber 2 is formed of a thin metal plate. In addition, you may form with a resin board or corrugated paper.

  The cylindrical absorbent body 2 has a structure in which four plate-shaped absorbent bodies 3 are wound in a cylindrical shape and the edge portions 3a and 3a thereof are joined to each other.

  As shown in FIG. 3, the tubular absorbent body 2 includes a strip 3 ′ formed by integrally forming four plate-shaped absorbents 3, 3, 3, and the strip 3. A V-shape formed with a predetermined inclination angle θ with respect to a boundary line B substantially parallel to the load input direction A, and with the boundary side B as the axis of symmetry and further spaced in the direction of the boundary axis B And a bead portion 4 having a shape.

  The bead portion 4 is formed by performing a bending process along each mountain fold line (see circles) and each valley fold line (see x marks) set in each plate-like absorber 3. .

  Further, when the band plate 3 ′ is wound in a cylindrical shape with the bead portion 4 being bent, the upper end side (one end side) 3 b and the lower end side (other end side) 3 c of each plate-like absorbent body 3 are Trimmed in advance along the a and b lines so as to be orthogonal to the load input direction A and parallel to each other. That is, it is formed by cutting out a portion surrounded by sides a, a ′ and b, b ′ from a rectangular thin plate indicated by a two-dot chain line. The size, shape, and the like of this trimming are appropriately set according to the diameter of the cylinder so that the upper end side and the lower end side are parallel when the cylinder is processed.

  The bead portion 4 has a V-shaped apex that expands from the intersection of the upper end side 3b or lower end side 3c of each plate-like absorber 3 and the boundary line B to the lower end side 3c or upper end side 3b. An approximately V-shaped or inverted V-shaped longest bead portion 4a extending so as to be in contact with the longest bead portion 4a is arranged at a predetermined interval so that the bead length is sequentially shortened, and the lower end side 3c or the upper end It is comprised by the 1st-4th gradually decreasing bead parts 4b-4e extended so that the edge | side 3b may be touched.

  Further, the portion of the strip 3 'that contacts the lower end side 3c of the longest bead portion 4a coincides with the central boundary line B' of the strip 3 ', and the first to fourth gradual reductions start from this coincidence point. The bead portions 4b to 4e are formed so as to contact the upper end side 3b. Thereby, the bead part 4 is formed in the whole surface of each plate-shaped absorber 3. FIG.

  As shown in FIG. 4, the impact energy absorbing member 1 is arranged as a single body or a plurality of bodies according to a portion corresponding to the head of an occupant in a roof member 6 of an automobile, for example. The lower end 3c is joined to the rein hose 6a, and the upper end 3b is joined to the ceiling interior member 6b. 4 and 5 (a) to 5 (d), for convenience of explanation, the vehicle body arrangement relationship of the tubular absorbent body 2 is upside down and a part of the tubular absorbent body 2 is used. Is shown in an expanded state.

  And when the passenger | crew of a vehicle interior carries out a secondary collision with the impact energy absorption member 1 by the impact force at the time of a vehicle collision, the impact load F will be transmitted to each bead part 4 of the cylindrical absorber 2, and each said bead part 4 will be long in order. The impact load F is absorbed by buckling deformation. Thereby, the influence on the passenger | crew at the time of a vehicle collision is suppressed.

  In this case, the bead portion 4 has a longest bead portion 4a extending from the boundary line B in contact with the upper end side 3b of each plate-like absorbent body 3 to be in contact with the lower end side 3c, and a bead length with respect to the longest bead portion 4a. Since the first to fourth gradually decreasing bead portions 4b to 4e are sequentially short, the initial load at the time of the vehicle collision is first absorbed by the buckling deformation of the longest bead portion 4a (FIG. 5A). When the impact load is further applied, the first gradually decreasing bead portion 4b is buckled and deformed together with the longest bead portion 4a (see FIG. 5B), and then the second, third and fourth gradually decreasing bead portions 4c, 4d and 4e are sequentially buckled and deformed (see FIGS. 5C and 5D). In this way, middle and late impact loads are absorbed.

  In the present embodiment, a band plate 3 ′ in which four plate-like absorbers 3 are integrally connected, and a plurality of bead portions 4 formed so as to form a predetermined inclination angle θ on each plate-like absorber 3. The longest bead portion 4a contacting the upper end side 3b or the lower end side 3c of each plate-like absorbent body 3 and the bead length of the longest bead portion 4a are sequentially shortened. Since it has the fourth gradually decreasing bead portions 4b to 4e, the initial compressive load at the time of the vehicle collision as described above is absorbed by the buckling deformation of the longest bead portion 4a, and the middle and late compression The load is absorbed by buckling deformation in the order of the first to fourth gradually decreasing bead portions 4b to 4e.

  As described above, in this embodiment, the buckling deformation is shifted in order from the longest bead portion 4a to the first to fourth gradually decreasing bead portions 4b to 4e. While being able to absorb efficiently, the deformation mode of the cylindrical absorber 2 can be made constant, and a stable energy absorbing function can be obtained.

  In addition, by changing the interval of the bead portions 4 or the number of installations, the impact energy absorption characteristics can be adjusted, the necessary energy absorption stroke can be secured, and the target energy absorption characteristics can be easily obtained. .

  In this embodiment, the energy absorbing function required with a simple structure that only bends the thin plate-like cylindrical absorber 2 can be obtained, and the energy absorbing effect on the weight of the member can be increased accordingly, and the cost and Weight can be reduced.

  Further, since only bending is required, the target impact energy absorption characteristic can be easily obtained by adjusting the interval, length, valley fold depth, inclination angle, and the like of the bead portions. As a result, it is not necessary to change or modify the mold as compared with the case where the energy absorber is formed by, for example, drawing, and the development cost of the energy absorber can be reduced and the development period can be shortened. It becomes possible.

  When forming a cylindrical energy absorber, trimming portions can be eliminated by forming each plate-like absorber continuously in the vertical direction. In this case, the yield rate is approximately 100%. can do.

  FIG. 6 is a diagram for explaining a second embodiment of the present invention, and the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

  The impact energy absorbing member 1 of the present embodiment is an example in which a cylindrical absorbent body 2 is formed by winding a plate-shaped absorbent body around an outer peripheral surface of a thin cylindrical pipe 10.

  Thus, when the plate-shaped absorber is wound around the cylindrical pipe 10 to form the cylindrical absorber 2, the absorption performance against the impact force can be improved and the productivity can be improved.

  Here, in the said Example 2, although the plate-shaped absorber was wound around the outer peripheral surface of the cylindrical pipe 10, this invention winds a plate-shaped absorber around the inner peripheral surface of the cylindrical pipe 11, as shown in FIG. In this case, the same effect as in the above embodiment can be obtained.

  In the first and second embodiments, the case where the energy absorber is formed in a cylindrical shape has been described as an example. However, the present invention is not limited to this, and for example, the energy absorber may be formed into a quadrangular or polygonal shape. Or it may be plate-shaped depending on the application.

DESCRIPTION OF SYMBOLS 1 Impact energy absorption member 2 Cylindrical absorber 3 Plate-shaped absorber 3b Upper end side (one end side)
3c Bottom edge (other edge)
4 Bead part 4a Longest bead part 4b-4e Gradually decreasing bead part A Load input direction B Boundary line θ Inclination angle

Claims (2)

An impact energy absorbing member that absorbs impact load by buckling deformation in the load input direction,
A plurality of plate-like absorbers having one end side intersecting with the load input direction and the other end side substantially parallel to the one end side and continuing through a boundary line extending substantially parallel to the load input direction;
In the plate-like absorber, a plurality of bead portions have a predetermined inclination angle with respect to the boundary line, and are further formed in a V shape having the boundary line as an axis of symmetry. Formed at intervals,
The V-shaped bead portion includes a longest bead portion in which a V-shaped apex is in contact with one end side or the other end side of the plate-like absorbent body, and a bead extending from the longest bead portion toward the other end side or one end side. An impact energy absorbing member comprising a plurality of gradually decreasing bead portions whose lengths are sequentially shortened. The impact energy absorbing member according to claim 1,
One end side and the other end side of the plate-shaped absorbent body are inclined from one boundary line to the other boundary line of the plate-shaped absorbent body, and the plurality of plate-shaped absorbent bodies have a cylindrical shape. An impact energy absorbing member, characterized in that it is a cylindrical absorbent body wound in such a manner.

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