JP4825037B2 - Frame structure - Google Patents

Description

  The present invention relates to a frame structure that efficiently absorbs impact energy generated by input of an impact load.

  A frame member made of a hollow outer shell structure is frequently used in a frame structure of an automobile body, and in particular, the use of a frame member made of aluminum or an aluminum alloy (hereinafter referred to as an aluminum material) is increasing. . Aluminum material has a great effect on weight reduction, but has a lower yield point with respect to load input than iron material. This indicates that when a load that generates compressive stress due to a bending moment is input to an aluminum material frame member, plastic deformation starts with a load smaller than that of an iron frame member. When impact energy is generated by being input, the impact energy absorption performance is usually low, and it is necessary to reinforce the yield point particularly in a portion where a load is easily input. However, since aluminum frame members are mainly extruded for ease of manufacturing, it is difficult to partially reinforce the thickness of only the necessary portions in the longitudinal direction. There is no choice but to implement a thickening method. Such a reinforcing method is contrary to the purpose of weight reduction. Therefore, as a solution, there is a technique of partially reinforcing a filler by filling a closed cross section of a frame member in a portion that needs reinforcement (see Patent Document 1).

Patent Document 1 aims to efficiently reinforce the filler by foam filling, but the crushing load as the filler is lower than that of the honey metal, but higher than that of the resin foam, and the deformation performance at the time of compression is improved. As a material to have, a technique of filling foam aluminum, which is a kind of porous material in which a large number of bubbles are uniformly dispersed in an aluminum material, is also disclosed (see Patent Document 2 and Patent Document 3). .
JP 2001-088740 A JP-A-10-175567 JP 2003-336777 A

  According to the conventional technique of filling a filler such as foamed aluminum in a closed cross section of a frame member made of a hollow outer shell structure, when an impact load that generates compressive stress due to a bending moment is input to the frame member Since the input impact load can be dispersed by the filler filled in the frame member, the effect of enhancing the yield point and reinforcing the frame member can be obtained.

  However, when the impact load input to the frame member filled with the filler exceeds the yield load, the fracture occurs and the plastic member cannot be sufficiently plastically deformed, and the impact energy generated by the input of the impact load cannot be sufficiently absorbed. is there. This is because when the plastic deformation of the frame member is started by the compressive deformation generated in the frame member due to the input impact load, the progress of the plastic deformation is restricted by the filler filled in the frame member, and the frame member is sufficiently This is due to the inability to plastically deform.

FIG. 8 shows a state of deformation when a load is input to the aluminum frame.
As shown in FIG. 8A, when a load G is input to the aluminum frame 10 as a frame member made of a hollow outer shell structure, a compressive stress σc is generated on the input side of the load G, and the load G A tensile stress σt is generated on the surface opposite to the input. Here, when the input load G exceeds the yield load, the progress of deformation due to the compressive stress σc precedes the progress of deformation due to the tensile stress σt, so the aluminum frame 10 starts plastic deformation due to compressive deformation. Since the compression deformation proceeds in a bending manner in which the outer shell portion 10c of the aluminum frame 10 enters the closed cross section, the aluminum frame 10 is bent by the input yield load (load G).

  As shown in FIG. 8B, even when the foamed aluminum filler 21 is filled as the filler in the closed cross section of the aluminum frame 10, the load G input to the aluminum frame 10 exceeds the yield load. In this case, the aluminum frame 10 starts plastic deformation due to plastic deformation. However, since the entry of the outer shell portion 10c of the aluminum frame 10 into the closed cross section is constrained by the foamed aluminum filler 21, the aluminum frame 10 bends due to compression deformation. Plastic deformation cannot proceed.

  Therefore, the cross-sectional shape of the aluminum frame 10 is not deformed, and the cross-sectional coefficient of the aluminum frame 10 is not reduced. As a result, the tensile stress σt generated on the surface opposite to the input of the load G increases as the input load G increases, and the increased tensile stress σt causes a rise in FIG. As shown, the aluminum frame 10 is broken.

  And when a fracture | rupture generate | occur | produces, since the absorption capability of the impact energy in this point will lose | disappear, there exists a problem of having influence, such as a deformation | transformation, on another location with the impact energy which cannot be absorbed.

  Therefore, the present invention reinforces the yield point to be high by filling the closed cross section of the frame member, and when the input impact load exceeds the yield load, the impact energy is increased by sufficient plastic deformation. It is an object of the present invention to provide a frame structure that can absorb water.

In order to solve the above-mentioned problem, the invention according to claim 1 is a frame structure including a frame member having a square cross-sectional shape, in which a filler is filled in a closed cross-section, and at least a part of the filler. Is provided in a groove shape along the longitudinal direction of the frame member, and the filler is formed on the inner wall on the side where the unfilled region is formed . An abutting portion that abuts along the longitudinal direction is provided, and the unfilled region restrains the progress of bending in which the outer portion of the frame member on the side where the unfilled region is formed proceeds toward the closed cross section. The frame structure forms an unrestrained region that does not. Even if plastic deformation starts due to compressive deformation, it can proceed with respect to this unconstrained region, so that the progress of plastic deformation is not constrained and can be sufficiently plastically deformed.

The invention according to claim 2 is a frame structure including a frame member having a square cross-sectional shape, in which a first filler is filled in a closed cross section, and at least one of the first fillers. A second filler region made of a second filler having a density different from that of the first filler, wherein the second filler region is at least partially along the longitudinal direction of the frame member. An abutting portion is provided on the inner wall that abuts against the inner wall of the frame member and the second filler material region abuts on the inner wall along the longitudinal direction of the frame member. The material region has a frame structure in which the outer portion of the frame member on the side where the second filler material region abuts forms a non-constrained region that does not restrain the progress of bending that proceeds toward the closed cross section. By reducing the density of the second filler filling the second filling region from the density of the first filler, an unconstrained region is formed, and even when plastic deformation starts by compressive deformation, Since the plastic deformation can proceed with respect to the unconstrained region, the progress of the plastic deformation is not constrained and the plastic deformation can be sufficiently performed.

Furthermore, the invention according to claim 3 is the frame structure in which in the cross section of the frame member, the unconstrained region exists only on the inner wall side facing the unconstrained region rather than the centroid in the cross section of the frame member. It was. According to the present invention, the yield point of the frame member can be increased and the input load can be reinforced.

  According to the present invention, it is possible to enhance the yield point and to absorb the impact energy generated by the input of the impact load by sufficient plastic deformation when the input impact load exceeds the yield load. Can provide a frame structure.

  Hereinafter, the best embodiment for carrying out the present invention will be described in detail with reference to the drawings as appropriate.

<< First Embodiment >>
FIG. 1 is a diagram showing a first embodiment of the present invention. FIG. 1A is a hollow outer shell structure made of an aluminum material having a square cross-sectional shape, and the aluminum frame 10 has a closed cross section as a frame member according to claim 2. It is sectional drawing of the frame structure 1 filled with the foaming aluminum filler 21 as a filler described in a claim so that it may contact | abut an inner wall. Furthermore, since the load G input side (the upper side in FIG. 1) is a region where compressive deformation occurs, it has an unfilled region 22 of the foamed aluminum filler 21 as an unconstrained region described in the claims. Features.

  Here, the unfilled region 22 of the foamed aluminum filler 21 does not hinder the progress of bending when the frame structure 1 is bent toward the closed cross section of the aluminum frame 10, that is, restrains the progress of the bending. The non-restraining region described in the claims is set as the non-restraining region. The centroid is the center of gravity in the cross-sectional shape of the aluminum frame 10 in a state where the foamed aluminum filler 21 is not filled.

Also, the foamed aluminum filler 21 is a filler made of foamed aluminum manufactured by heating the aluminum material and the foaming agent as raw materials and confining and solidifying the gas generated from the foaming agent in the molten aluminum material. It can be manufactured in various densities. In this embodiment, the foamed aluminum filler 21 having a density of 0.3 g / cm ³ to 0.6 g / cm ³ is used as the filler.

  FIG. 2 is a schematic view showing an aspect in which an aluminum frame is filled with a foamed aluminum filler. In this embodiment, an extruded product of an aluminum material is used as the aluminum frame 10. Then, as a method of filling the foamed aluminum filler 21 in the closed cross section of the aluminum frame 10, as shown in FIG. 2, the foamed aluminum filler formed in a substantially prismatic shape having a cross-sectional shape equal to the cross-sectional shape of the aluminum frame 10. A groove-shaped cut 21 a is provided on one side of 21 in the longitudinal direction of the foamed aluminum filler 21. A method of inserting into the aluminum frame 10 was adopted. This groove-shaped notch 21 a forms an unfilled region 22.

  Before the foamed aluminum filler 21 is inserted into the aluminum frame 10, an industrial adhesive (epoxy adhesive is generally used on the adhesive surface 21 b in contact with the inner wall 10 a of the aluminum frame 10 on the surface of the foamed aluminum filler 21. However, the foamed aluminum filler 21 is fixed in the closed cross section of the aluminum frame 10 by applying a coating material (which is not particularly limited). In FIG. 2, the bonding surface 21b is shown as the right side surface in the insertion direction with the upper surface of the foamed aluminum filler 21, but the lower surface and the left side surface in the insertion direction also become the bonding surface 21b. Not too long.

  Even when the foamed aluminum filler 21 is inserted into the aluminum frame 10 and a sheet-like rubber-like member is attached to the bonding surface 21b and inserted into the aluminum frame 10, the inner wall 10a of the aluminum frame 10 can be used. The foamed aluminum filler 21 is fixed in the closed cross section of the aluminum frame 10 by the close contact between the aluminum frame 10 and the rubber-like member.

  In addition, as another method of filling the foamed aluminum filler 21 in the closed cross section of the aluminum frame 10, the aluminum material and the foaming agent that are the materials of the foamed aluminum filler 21 are heated in the closed cross section of the aluminum frame 10, A method of foam filling in the closed cross section of the aluminum frame 10 is also conceivable. In this case, in order to form the unfilled region 22, a core having a cross-sectional shape of the unfilled region 22 is disposed in the closed section of the aluminum frame 10 in parallel with the aluminum frame 10, and the foamed aluminum filler 21 is formed. This can be achieved by extracting the core after foam filling.

  Here, as shown in FIGS. 1A and 1B, the unfilled region 22 is arranged at a position facing the input side of the load G of the inner wall 10 a of the aluminum frame 10, and from the inner wall 10 a of the aluminum frame 10. Is preferably equal to or less than the distance H2 from the inner wall 10a on the input side of the load G of the aluminum frame 10 to the centroid 11.

  Further, as shown in FIGS. 1A and 1B, the lateral length of the side along the inner wall 10a on the input side of the load G in the cross-sectional shape of the unfilled region 22 (hereinafter referred to as the lateral width). W1 may be equal to or less than the lateral width (hereinafter referred to as the inner wall width) W2 of the inner wall 10a on the input side of the load G of the aluminum frame 10, but the foamed aluminum filler 21 inputs the load G of the inner wall 10a of the aluminum frame 10. It is preferable to make it the shape which contact | abuts by the side by at least 1 surface or a point.

  That is, when the unfilled region 22 has a square shape as shown in FIG. 1A, the contact surfaces 2a and 2a are formed by making the lateral width W1 of the unfilled region 22 shorter than the inner wall width W2, and foam aluminum The filler 21 contacts the inner wall 10a of the aluminum frame 10 on the input side of the load G.

  When the unfilled region 22 has a triangular shape as shown in FIG. 1B, contact points 2b and 2b are formed even when the lateral width W1 is expanded to the same length as the inner wall width W2, and the foamed aluminum filler 21 is formed. Is in contact with the inner wall 10a of the aluminum frame 10 on the input side of the load G, the lateral width W1 may be equal to or smaller than the inner wall width W2.

  Next, FIG. 1C shows a cross-sectional view taken along line XX in FIG. This is a view in which the portion of the frame structure 1 filled with the foamed aluminum filler 21 is cut in the longitudinal direction. Note that a centroid line 11 a in the figure is a straight line connecting the centroids 11 in the cross section of the aluminum frame 10. The load G is input to the load input point 10b. As shown in FIG. 1C, the unfilled region 22 has the same cross-sectional shape and is substantially parallel to the longitudinal direction of the aluminum frame 10.

  As described above, in the frame structure 1 in which the aluminum frame 10 is filled with the foamed aluminum filler 21 so as to form the unfilled region 22 in the form shown in FIG. 1, the input load G is the input side of the load G Can be dispersed from the contact surfaces 2a, 2a or contact points 2b, 2b provided to the periphery via the foamed aluminum filler 21, so that an effect of increasing the yield point, that is, a reinforcing effect can be obtained.

  Hereinafter, the effect by this embodiment is demonstrated.

  FIG. 3 is a view showing a test material used in a test for measuring a deformation amount when a load is applied to the frame structure according to the present invention. 3A shows a side surface of the test material, and FIG. 3B shows a YY cross-sectional view in FIG. Below, the test result which measured the deformation | transformation amount when the load G is input to the specimen 3 shown in FIG. 3 is described.

  The specimen 3 has a 100 mm foamed aluminum filling region 3 a at the center in the longitudinal direction of a hollow frame member having a total length of 500 mm formed by extrusion molding of an aluminum material. The specimen 3 is supported by two fulcrums 3b installed at intervals of 400 mm.

In the measurement, three types of foamed aluminum fillers 21 having different densities are used. For the filling form, the presence / absence of the unfilled region 22 is set, and the six types of foamed aluminum filled regions 3a depending on the combination are set. A comparative measurement was performed on the specimen 3 having the same. Table 1 shows the types of the foamed aluminum filler 21 and the combinations of the filling forms.

  In addition, 6063-T5 (height x width x length: 30 mm x 40 mm x 500 mm, plate thickness: 2 mm) based on JIS H4100 was used for the aluminum material of the test material 3. 6063-T5 is a heat-treatable aluminum alloy generally used for extruded products.

  Moreover, in the filling form described in Table 1, “1/3 open” formed an unfilled region 22 (height × width: 10 mm × 12 mm) having a rectangular cross section shown in FIG. The filling method “entire cross section” indicates a filling method in which the foam aluminum filler 21 having the same density is filled over the entire area without forming the unfilled region 22. The test material F in Table 1 is the test material 3 having only a hollow frame member that is not filled with the foamed aluminum filler 21.

  Here, the test material D and the test material E in Table 1 are the test materials having the frame structure according to the present embodiment, and the test material A, the test material B, and the test material C are to be compared. This is a test material having a frame structure according to the prior art. The specimen F is a specimen having a hollow frame structure that is not filled with a filler as a comparison object.

  Then, as shown in FIG. 3A, when the load G is input to the load input point 10b located at the center in the longitudinal direction of the specimen 3, and the value of the load G is gradually increased. The deformation amount of each specimen 3 is measured.

  FIG. 4 is a diagram showing the results of measuring deformation when a load is input to the specimen 3. In addition, the symbol A to the symbol F in FIG. 4 corresponds to the symbol described in the column of the test material in Table 1, and includes the type and filling form of the foamed aluminum filler in the symbol of the test material in Table 1. The measurement results using the test material are shown.

  That is, the broken lines indicated by the symbols D and E in FIG. 4 show the measurement results of the test material having the frame structure according to the present embodiment, and the broken lines indicated by the symbols A, B, and C in FIG. The measurement result of the test material which has the frame structure based on this prior art is shown. Furthermore, the broken line indicated by the symbol F in FIG. 4 is a measurement result of a test material having a hollow frame structure not filled with a filler as a comparison target. Moreover, the peak of the load of the graph shown in FIG. 4 shows a yield point, and the cross mark (x) shows that the specimen was broken at that time.

  Hereinafter, the measurement results shown in FIG. 4 will be described with reference to FIG. According to FIG. 4, in any specimen 3, the amount of deformation increases corresponding to the increase of the input value of the load G, and each specimen 3 has a unique yield point. The test material D in Table 1 (indicated by symbol D in FIG. 4, hereinafter referred to as “test material D”) and the test material E in Table 1 (indicated by symbol E in FIG. 4). The material E) has a higher yield point than the test material F in Table 1 (shown by the symbol F in FIG. 4; hereinafter referred to as the test material F). That is, it can be seen that the test material D and the test material E according to the present embodiment are higher in strength against the input of the load G than the test material F.

  From the above, according to the present embodiment, the aluminum frame 10 as a frame member made of a hollow outer shell structure is filled with the foamed aluminum filler 21 as the filler so as to form the unfilled region 22. It can be said that the frame structure 1 shown by 1 is reinforced rather than the frame structure by the frame member which consists of a hollow outer shell structure.

  Furthermore, specimen A in Table 1 (indicated by symbol A in FIG. 4; hereinafter referred to as specimen A) and specimen B in Table 1 (indicated by symbol B in FIG. 4). The specimen D and specimen E are not broken, whereas the specimen B) is broken. That is, it can be seen that the test material D and the test material E have a larger amount of plastic deformation until fracture than the test material A and the test material B.

  Here, since the impact energy generated when an impact load is input as the load G is expressed by load × deformation amount, the larger the plastic deformation amount, the larger the impact energy can be absorbed by the plastic deformation. Therefore, the specimen D and specimen E according to the present embodiment have a larger amount of plastic deformation until fracture than the specimen A and specimen B according to the prior art. It can be said that the material E can absorb a larger impact energy by plastic deformation than the test material A and the test material B.

  From the above, according to the present embodiment, the aluminum frame 10 as a frame member made of a hollow outer shell structure is filled with the foamed aluminum filler 21 as the filler so as to form the unfilled region 22. The frame structure 1 shown by 1 relates to the prior art in which the aluminum frame 10 as a frame member made of a hollow outer shell structure is filled with the foamed aluminum filler 21 as the filler without forming the unfilled region 22. It can absorb a larger impact energy than the frame structure.

  Note that the specimen C in Table 1 (indicated by the symbol C in FIG. 4) does not break, but the yield point is not significantly different from that of the specimen F, so that effective reinforcement against the input of the load G is achieved. That's not true.

  From the above, as shown in FIG. 1, the frame structure 1 according to the present embodiment, which is filled so as to form the unfilled region 22 when the aluminum frame 10 is filled with the foamed aluminum filler 21, has the yield point. When the impact load is input as the load G and the input impact load exceeds the yield load, the impact energy generated by the input impact load is sufficiently absorbed by plastic deformation. I can say that. FIG. 8C shows a mode in which the frame structure 1 according to this embodiment shown in FIG. 1 is plastically deformed without breaking.

  Therefore, when the frame structure 1 according to the present invention shown in FIG. 1 is used as, for example, a frame structure of an automobile, the impact energy generated by the input of the impact load due to the collision is sufficiently absorbed by the plastic deformation of the frame structure, Since the influence on other parts can be reduced, it has a great effect on passenger protection.

  Although the first embodiment of the present invention has been described above, other embodiments are also possible with respect to the first embodiment.

  FIG. 5 is a diagram showing another embodiment of the first embodiment. For example, as shown in FIG. 5 (a), the cross-sectional shape of the unfilled region 22a may be a semicircular shape, or as shown in FIG. 5 (b), it has two triangular shapes. The unfilled region 22b may be used. Furthermore, as shown in FIG. 5C and FIG. 5D, it has a cross-sectional shape of a plurality of rectangular unfilled regions 22c and a plurality of triangular unfilled regions 22d. The shape can be made in consideration of other factors such as weight reduction. In addition, although the example of the four unfilled area | regions 22 is shown in FIG.5 (c) and FIG.5 (d), the number of the unfilled area | regions 22 is not limited to this.

  In other words, the condition that the foamed aluminum filler 21 abuts the inner wall 10a on the input side of the load G of the aluminum frame 10 at at least one surface or point, and the unfilled region 22 is the inner wall 10a of the input side of the load G of the aluminum frame 10 The height H1 from the inner wall 10a of the unfilled region 22 is a cross-sectional shape that satisfies the condition that the distance H2 from the inner wall 10a on the input side of the load G to the centroid 11 is shorter. Even if the cross-sectional shape is any shape, the same effect as the present invention can be obtained.

<< Second Embodiment >>
FIG. 6 is a diagram illustrating the second embodiment. As shown in FIG. 6, the second embodiment of the present invention is described in a part of the load G input side of the first foamed aluminum filler 60 as the first filler described in the claims. As the second filler, a second foamed aluminum filler 70 having a density different from that of the first foamed aluminum filler 60 is filled. Then, the density of the second foamed aluminum filler 70 is made smaller than the density of the first foamed aluminum filler 60. The region filled with the second foamed aluminum filler 70 is a non-restraint region described in the claims. For example, the second embodiment can be realized by filling the unfilled region 22 (see FIG. 1) in the first embodiment with the second foamed aluminum filler 70. The first aluminum foam filler 60 is equivalent to the aluminum foam filler 21 in the first embodiment.

  In the second embodiment, since the second foamed aluminum filler 70 is filled in a part of the first foamed aluminum filler 60, the second foamed aluminum is supplied when the load G is input to the frame structure 6. Since the load G can be dispersed around the filler 70 as well, the load G can be dispersed more efficiently around the first embodiment having the unfilled region 22 in the space region where the load G cannot be dispersed around. Therefore, it is possible to obtain the effect of increasing the yield point equivalent to or higher than that of the first embodiment, that is, the effect of reinforcing the frame structure 6.

  Further, since the density of the second foamed aluminum filler 70 is smaller than the density of the first foamed aluminum filler 60 and forms the unconstrained region described in the claims, an impact load is applied to the frame structure 6 as the load G. When the input impact load exceeds the yield load, the aluminum frame 10 is bent as a plastic deformation, but the bending can proceed to the unconstrained region in the closed cross section of the aluminum frame 10. The aluminum frame 10 can be bent sufficiently. That is, sufficient plastic deformation can be generated, and the impact energy generated by the impact load can be absorbed.

  FIG. 7 is a diagram illustrating another modification of the second embodiment. As shown in FIG. 7A, an embodiment in which the first embodiment and the second embodiment are combined to have an unfilled region 22 c and a region filled with the second foamed aluminum filler 70 is also conceivable. . FIG. 7A shows a second example of the two unfilled regions 22c located at the ends of the four unfilled regions 22c having the four rectangular cross-sectional shapes illustrated in FIG. This is an example of the frame structure 7 filled with the foamed aluminum filler 70. In this case, the two unfilled regions 22c at the center and the regions filled with the two second foamed aluminum fillers 70 at the ends are the unconstrained regions described in the claims.

  Further, in addition to the second foamed aluminum filler 70, a third foamed aluminum filler 71, a fourth foamed aluminum filler 72, and a fifth foamed aluminum having different densities as shown in FIG. 7B. A frame structure 8 in which the fillers 73 are stacked in layers is also conceivable. In this case, for example, the density is decreased in the order of the second foamed aluminum filler 70, the third foamed aluminum filler 71, the fourth foamed aluminum filler 72, and the fifth foamed aluminum filler 73. The unconstrained region described in the claims can be formed. In addition, although the example of 4 layers was shown in (b) of FIG. 7, the number of layers is not limited to this.

  Although the embodiment of the present invention has been described above, the filler and the second filler described in the claims are not limited to foamed aluminum in terms of material, and other foamed metals or materials different in material Even if it is a rubber material or a polystyrene material, it can be used if the required strength can be secured.

It is sectional drawing which shows the filling form which concerns on this invention to the aluminum frame of a foaming aluminum filler. (A) is a diagram showing that a rectangular unfilled region is provided, and (b) is a diagram showing that a triangular unfilled region is provided. Furthermore, (c) is sectional drawing which shows the XX cross section in (a). It is a figure which shows the aspect which inserts a foaming aluminum filler in an aluminum frame. It is a figure which shows the test material used in measuring the deformation amount with respect to the input load to the aluminum frame which concerns on this invention. (A) is a side view of a longitudinal direction, (b) is sectional drawing which shows the YY cross section in (a). It is a figure which shows the measurement result of the deformation amount with respect to the input load to the aluminum frame which concerns on this invention. It is a figure which shows the modification of 1st Embodiment which concerns on this invention. (A) is a figure which shows the unfilled area | region which has a semicircle shaped cross section, (b) is a figure which shows the unfilled area | region which has two triangular shapes, (c) has four rectangular-shaped cross sections. The figure which shows an unfilled area | region, (d) is a figure which shows the unfilled area | region which has four triangle shape. It is a figure which shows one example of the 2nd Embodiment which concerns on this invention. It is a figure which shows another form of the 2nd Embodiment which concerns on this invention. (A) is a figure which shows the example which has two unfilled area | regions and the filling area | region of two 2nd foam aluminum fillers, (b) is piled up four types of foam aluminum fillers from which a density differs in layers FIG. It is a figure which shows a deformation | transformation of an aluminum frame when the load G is input into the aluminum frame. (A) is a figure which shows that bending generate | occur | produces in a hollow aluminum frame, (b) is a figure which shows that a fracture | rupture generate | occur | produces in the aluminum frame filled with the filler, (c) is this embodiment. It is a figure which shows that the frame structure which concerns changes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame structure 10 Aluminum frame 10a Inner wall 11 Centroid 21 Foamed aluminum filler 22 Unfilled area | region 60 1st foamed aluminum filler 70 2nd foamed aluminum filler G Load

Claims (3)

A frame structure composed of a frame member having a square cross-sectional shape filled with a filler in a closed cross-section,
An unfilled region where at least a part of the filler does not contact the inner wall of the frame member is provided in a groove shape along the longitudinal direction of the frame member, and the inner wall on the side where the unfilled region is formed Providing a contact portion where the filler contacts the longitudinal direction of the frame member ;
The frame is characterized in that the unfilled region forms a non-constrained region in which the outer portion of the frame member on the side where the unfilled region is formed does not restrain the bending that proceeds toward the closed cross section. Construction. A frame structure composed of a frame member having a square cross-sectional shape filled with a first filler in a closed cross-section,
At least a part of the first filler includes a second filler region made of a second filler having a density different from that of the first filler;
At least a portion of the second filler region abuts on the inner wall of the frame member along the longitudinal direction of the frame member, and the first filler is on the inner wall on the side where the second filler region abuts. Providing an abutting portion that abuts along the longitudinal direction of the frame member ;
The second filler material region forms a non-restraining region in which the outer portion of the frame member on the side where the second filler material region abuts does not restrain the progress of the bending that proceeds toward the closed cross section. And frame structure. In the cross section of the frame member,
3. The frame structure according to claim 1, wherein the unconstrained region exists only on the inner wall side facing the unconstrained region rather than a centroid in a cross section of the frame member.

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