JP3938265B2 - Shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorber using a honeycomb block made of a metal or a non-metallic material, and more particularly to a shock absorber in which the strength or impact load of the honeycomb block is changed stepwise or continuously along the axial direction. Is.
[0002]
[Prior art]
Conventionally, it is known to use a laminated honeycomb block as a collision test member or a shock absorbing member of an automobile.
[0003]
By the way, when the laminated honeycomb block as described above is used for a side impact test of an automobile, it is necessary to satisfy the characteristics defined by laws and regulations. The characteristic assumes the front rigidity of the automobile, and the load increases as the amount of deformation increases.
[0004]
Furthermore, the upper and lower limits of the load are set for an arbitrary amount of deformation, and it is required to put the load in that range.
[0005]
[Problems to be solved by the invention]
As a laminated honeycomb block conventionally used as a shock absorber, for example, as shown in FIG. 8, an intermediate plate made of a metal plate or the like between a plurality of honeycomb blocks 1 having cell openings 1a on the front and rear surfaces. In order to ensure the air permeability between the inside and the outside of the honeycomb block 1, a large number of air holes 3 are formed in the intermediate plate 2.
[0006]
In addition to this, as shown in FIG. 9, an intermediate plate 2a having no vent hole 3 is also known.
[0007]
However, the load characteristics of the laminated honeycomb block 1 using the intermediate plate 2 having the vent holes 3 or the intermediate plate 2a having no vent holes 3 are as shown in the diagram (A) of FIG. There is a problem that it is difficult to obtain a characteristic that satisfies the required range of linearly increasing load and linearly increasing load.
[0008]
Further, in order to adjust the buffer characteristics (reaction force characteristics) of the metal honeycomb used for the automobile crash test or the like, for example, as shown in FIGS. 11 (a) and 11 (b), the honeycomb block 4 is formed into a plurality of layers. A method of stacking and assembling and changing the strength of the metal honeycomb stepwise is known.
[0009]
However, in order to change the strength more continuously, it is necessary to further reduce the height and increase the number of stacked layers, and there is a problem that the structure becomes complicated.
[0010]
An object of the present invention is to make it possible to change the strength of the honeycomb block arbitrarily along the axial direction, and to change the shock-absorbing characteristics against the impact load stepwise or continuously along the axial direction. An object of the present invention is to provide a shock absorber capable of arbitrarily designing the strength and load characteristics of a block.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a honeycomb block in which a plurality of hexagonal cross-section cylindrical cells made of a metal material are arranged so that their axial directions are parallel to each other, and the side walls of the cells The thickness of the side wall of the cell is changed from one end to the other end side in the axial direction by changing the foil thickness of the cell block stepwise or continuously from one end to the other end side in the axial direction of the honeycomb block. The gist is that the strength in the axial direction of the honeycomb block is changed by changing the thickness to be thin stepwise or continuously.
[0012]
Further, another shock absorber of the present invention comprises a honeycomb block in which a plurality of hexagonal cross-section cylindrical cells made of a metal material are arranged so that their axial directions are parallel to each other, and the side walls of the cells The thickness of the side wall of the cell is changed from one end in the axial direction by changing stepwise or continuously from one end in the axial direction of the honeycomb block to the other end side. The gist is that the strength in the axial direction of the honeycomb block is changed by changing the thickness in a stepwise or continuous manner toward the other end side .
[0013]
Here, the shock absorber of the former, the foil thickness of the side wall metal foil of the cell can be varied by etching, a plurality pieces along the axial direction of the honeycomb block to the side wall surfaces of the cells of the honeycomb block A through hole can also be provided. In this case, the Ki plurality pieces of the through hole toward the other end from the one axial end of the honeycomb block out also be varied to gradually become large, provided on one side wall surface of the cell a plurality of through holes, wherein in the axial direction and a plane perpendicular of the honeycomb block Ki de also be arranged to overlap each other in the axial direction of said honeycomb block, a plurality of through provided on the one sidewall surface of the cell The holes and the plurality of through holes provided in the side wall surface adjacent to the side wall surface may be arranged so as to overlap each other in the axial direction of the honeycomb block in a plane orthogonal to the axial direction of the honeycomb block. Further, among the plurality of cells, a plurality of through holes provided in a side wall surface of one cell and a plurality of through holes provided in a side wall surface of another cell are in the axial direction of the honeycomb block. Can be arranged so as to overlap each other in the axial direction of the honeycomb block in a plane orthogonal to the honeycomb block. In the former and the latter shock absorbers, the cell may be formed from an aluminum material .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0015]
Fig. 1 (a) is a perspective view of a honeycomb block showing a first embodiment of the present invention, Fig. 1 (b) is a cross-sectional view taken along the line AA in Fig. 1 (a), and Fig. 2 is the first embodiment. a graph showing the relationship between load and displacement of, 10, light metal material composed of a plurality of cells 11 (e.g., aluminum material) shows a honeycomb block of the front and rear portions of the cells 11, honeycomb An opening 12 having a hexagonal cross section is formed. The plurality of cells 11 are arranged so that their axial directions are parallel to each other.
[0016]
Since the honeycomb block 10 of the first embodiment is configured by continuously changing the axial strength, the thickness t of the honeycomb block 10 is changed from one axial end 10a (lower end side) to the other end side 10b. It is configured to change toward the (upper end side) (thickness → thin).
[0017]
As means for changing the thickness t, for example, the foil thickness of the honeycomb block 10 is changed from the one end 10a in the axial direction toward the other end 10b by an etching method, or a part or all of the wall surface of the cell 11 is changed. It is also possible to apply a metal plating to the plate and change the thickness of the plating layer stepwise or continuously in the axial direction.
[0018]
Further , as shown in FIGS. 3 and 4A, there is also a reference form of the honeycomb block 10 in which a plurality of through holes 13 are formed on the side surface of the cell 11 of the honeycomb block 10 to adjust the strength in the axial direction. is there.
[0019]
In addition to this, as shown in FIG. 4B, the density of the through holes 13 is adjusted, as shown in FIGS. 4C, 4D, and 4E, the arrangement of the through holes 13, There is also a reference form configured to adjust the strength against an impact load by changing the size and shape of the through hole 13 stepwise or continuously along the axial direction.
[0020]
Further, in order to change the density of the through holes 13 formed in the side surface of the cell 11 of the honeycomb block 10 in the axial direction, the number of the through holes 13 is changed from the upper end side to the lower end side as shown in FIG. It is configured so that it gradually decreases toward the bottom, and as shown in FIG. 5B, the hole diameter of the through hole 13 is changed so as to gradually decrease from the upper end side toward the lower end side. There is also a reference form in which the strength against the load is adjusted stepwise or continuously.
[0021]
Furthermore, as a means for adjusting the strength against the impact load more continuously (linearly), a method shown in FIGS. 6A to 6C can be considered.
[0022]
That is, in FIG. 6A, a plurality of through holes 13a are formed at a position intersecting the axial direction on one side surface 11a of the cell 11, and the plurality of through holes 13a are mutually connected in a plane orthogonal to the axial direction. By arranging so as to overlap (lap), when a load is applied from the axial direction, the plurality of through holes 13a are continuously crushed in the axial direction, and the strength against the impact load is more continuous (linear). ) Can be adjusted.
[0023]
In the case of FIG. 6B, a plurality of through holes 13a are formed in the side surface 11b adjacent to one side surface 11a of the cell 11 at a position intersecting the axial direction, and the plurality of through holes 13a are formed. By arranging them so as to overlap (wrap) each other in a plane orthogonal to the axial direction, the strength against the impact load is more continuous (linear) as in FIG. 6A when a load is applied from the axial direction. ) Can be adjusted.
[0024]
Furthermore, in the case of FIG. 6 (c), in the honeycomb block 10 composed of a plurality of cells 11, a plurality of through holes 13a provided in the axial direction on the side surface 11a of one cell 11 are provided to other cells 11x. By arranging a plurality of through-holes 13a provided in the side surface 11a in the axial direction and overlapping each other in a plane orthogonal to the axial direction, the same effect as described above can be expected. .
[0025]
As described above, implementation forms of the invention, or varied toward the other end side thickness t from one end side in the axial direction of the honeycomb block 10, the metal plating on a part or the whole of the cell walls subjected, The honeycomb block can be configured by changing the thickness of the plating layer stepwise or continuously in the axial direction, or by changing the thickness of the metal foil stepwise or continuously in the axial direction by an etching method. The strength or impact load of 10 can be changed stepwise or continuously along the axial direction, and an arbitrary load characteristic can be designed.
[0026]
Further, in the reference form of the shock absorber provided with the through holes 13 on the side surfaces of the cells 11 of the honeycomb block 10, the density, arrangement, size, and shape of the through holes are changed stepwise or continuously along the axial direction. In the case of changing more continuously, the through holes 13a formed along the axial direction are arranged so as to overlap (wrap) each other on a plane orthogonal to the axial direction, thereby accurately adjusting the strength against the impact load. it is Ru can.
[0027]
Furthermore, in another embodiment of the present invention shown in FIGS. 7A and 7B, the reference form in which the through-hole 13 is provided on the side surface of the cell 11 of the honeycomb block 10 and the foil thickness of the cell 11 of the honeycomb block 10 are different. This embodiment is a combination of the embodiment of the present invention that is changed from one axial end 10 a toward the other end 10 b by an etching method, and the embodiment of FIG. 7A is formed on the side surface of the cell 11. The hole diameter of the through-hole 13 is formed so as to gradually decrease from the upper end side toward the lower end side, and the foil thickness of the cell 11 is gradually decreased from one end 10a in the axial direction toward the other end side 10b. Formed.
[0028]
In the embodiment of FIG. 7B, the diameter of the through hole 13 formed on the side surface of the cell 11 is made the same diameter from the upper end side to the lower end side, and the foil thickness of the cell 11 is set to one end 10a in the axial direction. From the other side toward the other end side 10b, the thickness is gradually reduced.
[0029]
As another embodiment of the present invention, a plurality of through-holes 13a as shown in FIG. 6 (a) ~ (c) it is disposed so as to overlap each other in a plane perpendicular to the axial direction (lap) Reference In the cell 11 of the form, it is also possible to combine and form the cell 11 having a foil thickness that is gradually thinned from the one end 10a in the axial direction toward the other end 10b.
[0030]
With the configuration of each embodiment as described above, in the load-displacement characteristic diagram shown in FIG. 10 (a), as shown in the (B) diagram and (C) diagram, smooth and continuous. In the load-displacement characteristic diagram shown in FIG. 10B, the through hole 13a formed along the axial direction is a plane orthogonal to the axial direction. From the experimental results, it was found that the load variation can be reduced to the same level as that without holes (conventional) by adopting the configuration of the reference form that is arranged so as to overlap (wrap) each other.
[0031]
In FIG. 10 (b), (A) diagram is a reference form in which there is no hole on the side surface of the cell, (B) diagram is a reference form having a small hole diameter, and (C) is a pore diameter. There is shown a case of a large reference form, the (a) ~ as is clear from (C) diagram, and the gap of the through hole formed in the axial direction are the same, the load as the pore diameter is large Variation can be reduced.
[0032]
【The invention's effect】
Since the present invention is configured as described above, the following excellent effects can be obtained.
(1). With a simple configuration, the strength or impact load of the honeycomb block can be changed stepwise or continuously along the axial direction.
(2). As the strength or impact load of the honeycomb block can be changed stepwise or continuously along the axial direction, the shock absorber can be designed to have an arbitrary load characteristic, and the degree of freedom in design can be increased.
(3). By arranging the through holes formed along the axial direction so as to overlap (wrap) each other on a plane orthogonal to the axial direction, it is possible to further reduce the fluctuation with respect to the impact load.
(4). Fine adjustment of the strength is possible by using the adjustment of the foil thickness (wall thickness) in combination with the cell in which the through hole is formed.
[Brief description of the drawings]
FIG. 1A is a perspective view of a honeycomb block showing a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA in FIG.
FIG. 2 is a graph explanatory view showing the relationship between load and displacement in the first embodiment shown in FIG. 1;
FIG. 3 is a perspective view illustrating a reference form of a honeycomb block .
4A to 4E exemplify a reference form in which through holes are provided on the side surface of a honeycomb block cell, and show the density, arrangement, and shape of the through holes. FIG.
FIG. 5A illustrates a reference form in which the density of through holes formed in the side surface of the honeycomb block cell is changed in the axial direction, and FIG. 5B illustrates the side surface of the honeycomb block cell; The reference form which changed the hole diameter of the through-hole to the axial direction is illustrated .
FIGS. 6A to 6C are explanatory views showing the arrangement relationship of through-holes on the side surface of a cell in a reference form of a honeycomb block.
FIGS. 7A and 7B show the present invention when a through-hole is formed in the side surface of a cell of a honeycomb block and the thickness of the cell is changed from one end to the other end in the axial direction. shows the other embodiment, (a) corresponds to the taken along line B-B sectional view of FIG. 5 (b), (b) is equivalent to taken along line C-C sectional view shown in FIG. 6 (b) It is.
FIG. 8 is an exploded perspective view of a buffer device for a conventional laminated honeycomb block.
FIG. 9 is an exploded perspective view of a buffer device for a conventional laminated honeycomb block.
FIG. 10A is a graph explanatory view comparing the load characteristics of the shock absorber of the present invention and a conventional shock absorber , and FIG. 10B is a shock absorber according to a reference embodiment in which a through hole is provided on the side surface of the cell. It is graph explanatory drawing which compared the load characteristic of (honeycomb block) and the conventional buffer device .
FIG. 11A is a front view of a honeycomb block assembled by laminating honeycomb blocks in a plurality of layers in order to adjust the buffer characteristics (reaction force characteristics) of a conventional metal honeycomb; These are graph explanatory drawings which show the relationship between the load and displacement of the laminated honeycomb block of (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Honeycomb block 10a One end 10b of a honeycomb block The other end of a honeycomb block 11 Cell 12 Opening part 13 Through-hole t Thickness

Claims (9)

A plurality of hexagonal cylindrical cells made of a metal material are composed of honeycomb blocks arranged such that their axial directions are parallel to each other, and the foil thickness of the side walls of the cells is set in the axial direction of the honeycomb blocks. By changing stepwise or continuously from one end to the other end, the thickness of the side wall of the cell is changed stepwise or continuously from one end to the other end in the axial direction. A shock absorber configured by changing the axial strength of the honeycomb block. A plurality of hexagonal cylindrical cells made of a metal material are composed of honeycomb blocks arranged so that their axial directions are parallel to each other, and the thickness of the metal plating layer applied to the side walls of the cells is The thickness of the side wall of the cell is changed stepwise or continuously from one end to the other end side in the axial direction by changing stepwise or continuously from one end to the other end side of the honeycomb block in the axial direction. A shock absorber constructed by changing the strength in the axial direction of the honeycomb block by changing the thickness of the honeycomb block to be thinner. The shock absorber according to claim 1 , wherein the thickness of the metal foil on the side wall of the cell is changed by etching. The shock absorber according to claim 1 or 3 , wherein a plurality of through holes are provided in the side wall surface of the cell of the honeycomb block along the axial direction of the honeycomb block. The shock absorber according to claim 4 , wherein the plurality of through holes are changed so as to gradually increase in diameter from one end in the axial direction of the honeycomb block toward the other end. The buffer according to claim 4 , wherein a plurality of through holes provided on one side wall surface of the cell are arranged so as to overlap each other in the axial direction of the honeycomb block in a plane perpendicular to the axial direction of the honeycomb block. apparatus. A plurality of through holes provided on one side wall surface of the cell and a plurality of through holes provided on a side wall surface adjacent to the side wall surface in a plane orthogonal to the axial direction of the honeycomb block. The impact device according to claim 4 , wherein the impact device is arranged so as to overlap each other in the axial direction. Among the plurality of cells, a plurality of through holes provided in a side wall surface of one cell and a plurality of through holes provided in a side wall surface of another cell are orthogonal to the axial direction of the honeycomb block. The impact device according to claim 4 , wherein the impact device is arranged so as to overlap each other in the axial direction of the honeycomb block on a flat surface. The shock absorber according to any one of claims 1 to 8, wherein the cell is made of an aluminum material .

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