Cross member attachment structure

Abstract

To provide a cross member attachment structure making it possible to upgrade the surface rigidity of a gusset plate without forming a burr.SOLUTION: A cross member attachment structure 1 is configured to attach a cross member C to a frame (side rails S), and includes first gusset plates 10 which are used to fix the cross member C to the respective side rails S, and reinforcement patches 30 included in the respective first gusset plates 10. The first gusset plate 10 has a through hole 11h, through which the cross member C is passed, formed, and includes a flat plate part 11 to which the cross member C passed through the through hole 11h is joined, and a first extension part 12 and second extension part 13 which are extended from the flat plate part 11 toward the side rail S and fixed to the side rail S. The reinforcement patch 30 is formed in an annularly tabular shape having an opening 30h through which the cross member C is passed, disposed on the flat plate part 11 so as to enclose the cross member C passed through the through hole 11h, and joined to the flat plate part 11.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cross member mounting structure. [Background technology]

[0002] Patent Document 1 describes a vehicle frame. This frame has a structure in which side members and cross members are fastened with rivets via plate-shaped main gussets disposed above and below the members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-282532 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, it is known to use gussets when attaching a cross member to a vehicle frame. In some cases, a gusset with a generally U-shaped cross section is used. In this case, a through-hole for inserting a pipe-shaped cross member is formed in a flat portion of the gusset, which corresponds to the bottom of the U-shape. The cross member inserted through the through-hole is joined to the flat portion of the gusset, and the portion of the gusset that extends to intersect with the flat portion is fixed to the frame, thereby attaching the cross member to the frame via the gusset.

[0005] On the other hand, because pipe-shaped cross members have high torsional rigidity, constructing the flat plate portion of the gusset with the same rigidity would require the gusset plate to be thicker, resulting in increased weight and cost. In contrast, the flat plate portion of the gusset has low surface rigidity, so one option is to create burring around the edges of the through holes in the flat plate portion to relieve stress. However, creating burring requires a dedicated mold. This mold (drawing die) must be specially designed according to the size and height of the burring, which can easily increase the number of processing steps and costs.

[0006] Therefore, an object of the present invention is to provide a cross member mounting structure that can improve the surface rigidity of a gusset without forming burring. [Means for solving the problem]

[0007] The cross member mounting structure of the present invention is [1] "a cross member mounting structure for mounting a pipe-shaped cross member to a vehicle frame, comprising: a gusset for fixing the cross member to the frame; and a reinforcing patch provided on the gusset, the gusset having a through hole formed therein through which the cross member is inserted, and including a flat plate portion to which the cross member inserted into the through hole is joined, and a fixing portion extending from the flat plate portion toward the frame and fixed to the frame, the reinforcing patch being formed in the shape of a ring plate having an opening through which the cross member is inserted, and being positioned on the flat plate portion so as to surround the cross member inserted into the through hole and being joined to the flat plate portion."

[0008] In this cross member mounting structure, the gusset includes a flat plate portion having a through hole through which the cross member is inserted, a fixed portion extending from the flat plate portion toward the frame, and a ring-shaped reinforcement patch attached to the flat plate portion of the gusset so as to surround the cross member inserted in the through hole. This improves the surface rigidity of the flat plate portion where the gusset is attached to the cross member without forming burring.

[0009] The cross member mounting structure of the present invention may be [2] "the cross member mounting structure described in [1] above, in which the shape of the opening of the reinforcing patch matches the cross-sectional shape of the cross member." In this case, it is possible to avoid local concentration of stress from the cross member on the opening side of the reinforcing patch.

[0010] The cross member mounting structure according to the present invention may be [3] "the cross member mounting structure according to [1] or [2] above, in which the outer edge of the reinforcement patch has a circular shape." In this case, it is possible to avoid localized stress concentration on the outer edge side of the reinforcement patch.

[0011] The cross member mounting structure according to the present invention may be [4] "the cross member mounting structure according to any one of [1] to [3] above, wherein the opening of the reinforcing patch is larger than the through hole." In this case, the reinforcing patch can be prevented from contacting the cross member, and can be made into any shape and thickness, thereby improving the flexibility of the structure. [Effects of the Invention]

[0012] According to the present invention, a cross member mounting structure can be provided that can improve the surface rigidity of a gusset without forming burring. [Brief explanation of the drawings]

[0013] [Figure 1]FIG. 1 is a perspective view showing a vehicle body provided with a cross member mounting structure according to this embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a diagram showing the cross member mounting structure shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a cross member mounting structure according to one embodiment will be described with reference to the drawings. In the description of each drawing, the same or corresponding elements will be given the same reference numerals, and duplicated explanations may be omitted.

[0015] FIG. 1 is a perspective view showing a vehicle body provided with a cross member mounting structure according to this embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a view showing the cross member mounting structure shown in FIG. 3(a) is a perspective view, and FIG. 3(b) is a schematic cross-sectional view. The cross member mounting structure 1 shown in FIGS. 1 to 3 is for mounting a cross member C to a pair of side rails S that constitute a ladder frame of a vehicle. Note that, hereinafter, one side of the pair of side rails S will be described as an example, but the other side can be configured in a similar manner.

[0016] The cross member mounting structure 1 includes a first gusset (gusset) 10, a second gusset 20, and a reinforcing patch 30. The first gusset 10 is a plate-like member having a generally U-shaped cross section. More specifically, the first gusset 10 includes a flat plate portion 11, a flat plate-like first extending portion 12 extending from one end 11a (e.g., an upward end) of the flat plate portion 11 in a direction intersecting the flat plate portion 11 (e.g., a horizontal direction), and a flat plate-like second extending portion 13 extending from the other end 11b (e.g., a downward end) of the flat plate portion 11 opposite the one end 11a in the same direction as the extending direction of the first extending portion 12. The flat plate portion 11, the first extending portion 12, and the second extending portion 13 are integrally formed with one another.

[0017] The first gusset 10 is arranged so that the plate surface of the flat plate portion 11 intersects with the opposing direction of the pair of side rails S (e.g., the left-right direction), and the first extending portion 12 and the second extending portion 13 extend from the flat plate portion 11 toward the side rail S. Here, the side rail S is formed with a bottom portion Sa and a pair of edge portions Sb extending from the bottom portion Sa, forming a substantially U-shaped cross section. The first gusset 10 is arranged so that a portion 12a of the first extending portion 12 opposite the flat plate portion 11 and a portion 13a of the second extending portion 13 opposite the flat plate portion 11 overlap the edge portions Sb of the side rail S inside the side rail S.

[0018] The first gusset 10 is fixed to the side rail S by inserting fastening members B such as bolts into the overlapping portions between a portion 12a of the first extending portion 12 and a portion 13a of the second extending portion 13 and an edge portion Sb of the side rail S. In other words, the first extending portion 12 and the second extending portion 13 of the first gusset 10 function as fixing portions that extend from the flat portion 11 toward the side rail S and are fixed to the side rail S.

[0019] A through hole 11h through which the cross member C is inserted is formed in the flat plate portion 11 of the first gusset 10. Here, the cross member C is formed in the shape of a pipe with a circular cross section, and the shape of the through hole 11h is circular, which is the same as the cross-sectional shape of the cross member C. The flat plate portion 11 is joined to the cross member C inserted into the through hole 11h, for example, by welding. In other words, the first gusset 10 is joined to the cross member C at the flat plate portion 11, and is also fixed to the side rail S at the first extension portion 12 and the second extension portion 13, thereby fixing the cross member C to the side rail S.

[0020] The second gusset 20 is a plate-like member having a substantially U-shaped cross section. More specifically, the second gusset 20 includes a flat plate portion 21, a flat plate-like first extending portion 22 extending from one end 21a (e.g., an upper end) of the flat plate portion 21 in a direction intersecting the flat plate portion 21 (e.g., a horizontal direction), and a flat plate-like second extending portion 23 extending from the other end 21b (e.g., a lower end) of the flat plate portion 21 opposite the one end 21a in the same direction as the extending direction of the first extending portion 22. The flat plate portion 21, the first extending portion 22, and the second extending portion 23 are integrally formed with one another.

[0021] The second gusset 20 is arranged so that the plate surface of the flat plate portion 21 is approximately parallel to the plate surface of the flat plate portion 11 of the first gusset 10, and so that the first extending portion 22 and the second extending portion 23 extend from the flat plate portion 21 toward the side rail S. The second gusset 20 is arranged entirely inside the side rail S and the first gusset 10. In this state, the flat plate portion 21 and the second extending portion 23 of the first extending portion 22 are arranged so that they entirely overlap the edge portion Sb of the side rail S and the first extending portion 12 and second extending portion 13 of the first gusset 10.

[0022] The second gusset 20 is fixed to the side rail S together with the first gusset 10 by inserting the fastening member B into the edge portion Sb of the side rail S, so that the first extension portion 22 and the second extension portion 23, together with the first extension portion 12 and the second extension portion 13 of the first gusset 10, are fixed to the side rail S. In other words, the first extension portion 22 and the second extension portion 23 of the second gusset 20 function as a fixing portion that is fixed to the side rail S.

[0023] A through hole 21h, through which the cross member C is inserted, is formed in the flat plate portion 21 of the second gusset 20. Here, the shape of the through hole 21h is circular, which is the same as the cross-sectional shape of the cross member C. The flat plate portion 21 is joined to the cross member C inserted into the through hole 21h, for example, by welding. That is, the second gusset 20 is joined to the cross member C at the flat plate portion 21, and is fixed to the side rail S and the first gusset 10 at the first extension portion 22 and the second extension portion 23, thereby contributing to fixing the cross member C to the side rail S.

[0024] The reinforcing patch 30 is provided on the first gusset 10. More specifically, the reinforcing patch 30 is formed in the shape of an annular plate having an opening 30h, and is arranged on the flat plate portion 11 so that the opening 30h communicates with a through hole 11h formed in the flat plate portion 11 of the first gusset 10 and so as to surround the cross member C inserted through the through hole 11h. In this state, the reinforcing patch 30 is joined at its outer edge 30e to the flat plate portion 11 by, for example, welding.

[0025] The shape of the opening 30h of the reinforcing patch 30 matches the cross-sectional shape of the cross member C, and is circular in this case. The shape of the outer edge 30e of the reinforcing patch 30 is also circular. Therefore, in this embodiment, the reinforcing patch 30 is formed in the shape of an annular plate. On the other hand, the opening 30h of the reinforcing patch 30 is larger than the through hole 11h of the first gusset 10 (and the through hole 21h of the second gusset 20), and when the cross member C is inserted through the opening 30h, a gap is formed between the inner surface of the opening 30h and the outer surface of the cross member C.

[0026] In the illustrated example, the reinforcing patch 30 is arranged and joined to one of a pair of plate surfaces facing opposite sides of the flat plate portion 11 of the first gusset 10, the plate surface facing the opposite side to the extending direction of the first extending portion 12 and the second extending portion 13. However, the reinforcing patch 30 may also be arranged and joined to one of a pair of plate surfaces of the flat plate portion 11 of the first gusset 10, the plate surface facing the extending direction side of the first extending portion 12 and the second extending portion 13.

[0027] The materials and thicknesses of each component of the cross member mounting structure 1 will now be described. The first gusset 10 is made of, for example, SPFH540. The second gusset 20 is made of, for example, SPFH440. The reinforcing patch 30 is made of, for example, SPCC270. The material of the reinforcing patch 30 may be the same as or different from that of the first gusset 10. The thickness of the reinforcing patch 30 can be set arbitrarily depending on the required rigidity, but may be thinner than that of the first gusset 10, for example. However, from the viewpoint of welding between the reinforcing patch 30 and the first gusset 10, it is preferable that the difference between the thickness of the reinforcing patch 30 and the thickness of the first gusset 10 is not large. For example, the ratio of the thickness of the reinforcing patch 30 to the thickness of the first gusset 10 may be approximately 0.5 to 3 times. Furthermore, the opening 30h of the reinforcing patch 30 is larger than the outer dimensions of the cross member C, and the ratio of the size of the opening 30h to the outer dimensions of the cross member C may be approximately 1 to 5 times the thickness of the cross member C, for example.

[0028] As described above, in the cross member mounting structure 1 according to this embodiment, the first gusset 10 includes a flat plate portion 11 having a through hole 11h through which the cross member C is inserted, to which the cross member C inserted through the through hole 11h is joined, and a first extension portion 12 and a second extension portion 13 (i.e., fixing portions) extending from the flat plate portion 11 toward the side rail S and fixed to the side rail S. The flat plate portion 11 of the first gusset 10 has an annular plate-shaped reinforcing patch 30 disposed on the flat plate portion 11 so as to surround the cross member C inserted through the through hole 11h and joined to the flat plate portion 11. This improves the surface rigidity of the flat plate portion 11, which is the joint between the first gusset 10 and the cross member C, without forming burring.

[0029] Furthermore, in the cross member mounting structure 1 according to this embodiment, the shape of the opening 30h of the reinforcing patch 30 matches the cross-sectional shape of the cross member C. This makes it possible to avoid localized concentration of stress from the cross member C on the side of the opening 30h of the reinforcing patch 30.

[0030] Furthermore, in the cross member mounting structure 1 according to this embodiment, the outer edge 30e of the reinforcing patch 30 has a circular shape. This makes it possible to avoid localized stress concentration on the outer edge 30e side of the reinforcing patch 30.

[0031] Furthermore, in the cross member mounting structure 1 according to this embodiment, the opening 30h of the reinforcing patch 30 is larger than the through hole 11h of the first gusset 10. This prevents the reinforcing patch 30 from coming into contact with the cross member C, and allows for any shape and thickness, thereby improving the degree of freedom in the structure.

[0032] The above embodiment describes one aspect of the cross member mounting structure according to the present invention. Therefore, the cross member mounting structure according to the present invention is not limited to the cross member mounting structure 1 according to the above embodiment, and can be modified as desired.

[0033] For example, if the cross-sectional shape of the cross member C is a polygon, such as a square, the shape of the opening 30h and the outer edge 30e of the reinforcement patch 30 may be a similar polygonal shape. In this case, the reinforcement patch 30 may be configured in the shape of a polygonal plate. Furthermore, the shape of the opening 30h of the reinforcement patch 30 does not have to match the cross-sectional shape of the cross member C. [Explanation of symbols]

[0034] 1...cross member mounting structure, 10...first gusset (gusset), 11...flat plate portion, 11h...through hole, 12...first extension portion (fixed portion), 13...second extension portion (fixed portion), 30...reinforcement patch, 30h...opening, 30e...outer edge, C...cross member, S...side rail (frame).

Claims

1. A cross member mounting structure for mounting a pipe-shaped cross member to a vehicle frame, a gusset for securing the cross member to the frame; a reinforcing patch provided on the gusset; Equipped with The gusset a flat plate portion formed with a through hole through which the cross member is inserted, and to which the cross member inserted into the through hole is joined; a fixing portion extending from the flat plate portion toward the frame and fixed to the frame; Including, The reinforcing patch is formed in a ring-shaped plate shape having an opening through which the cross member is inserted, and is disposed on the flat plate portion so as to surround the cross member inserted into the through hole and is joined to the flat plate portion. Cross member mounting structure.

2. The shape of the opening in the reinforcement patch matches the cross-sectional shape of the cross member. The cross member mounting structure according to claim 1.

3. The shape of the outer edge of the reinforcing patch is circular. The cross member mounting structure according to claim 1.

4. The opening of the reinforcing patch is larger than the through hole. A cross member mounting structure according to any one of claims 1 to 3.

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