Vehicle side sill

Abstract

The vehicle side sill according to the present invention may include a side sill frame formed to have a hollow portion, a partition member passing through the hollow portion to divide the hollow portion into a first hollow portion and a second hollow portion, a first reinforcing frame located in the first hollow portion and contacting the side sill frame and the partition member to form a closed cross section of the first hollow portion in a cross section taken in a thickness direction of the side sill frame, and a second reinforcing frame located in the second hollow portion and contacting the side sill frame and the partition member to form a closed cross section of the second hollow portion in a cross section taken in a thickness direction of the side sill frame.

Description

[Technical field]

[0001] The present invention relates to a side sill for a vehicle. [Background technology]

[0002] Vehicle side sills serve to protect passengers by absorbing collision energy during a side collision.

[0003] Side sills applied to environmentally friendly vehicles such as electric vehicles protect not only passengers but also the battery located on the floor. Since the battery is relatively large in volume compared to other components of the vehicle, the side space of a vehicle equipped with a battery is relatively narrow compared to a vehicle equipped with an internal combustion engine.

[0004] Therefore, the side sill applied to the environmentally friendly vehicle must be able to absorb maximum collision energy within a narrow space and have minimum weight to improve the energy efficiency of the environmentally friendly vehicle.

[0005] For this reason, aluminum extrusion materials have been used for environmentally friendly vehicle side sills, but there is still a demand for improved collision energy absorption capacity and weight reduction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Utility Model Publication No. 20-1998-0043143 (1998.09.25) Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to improve the collision energy absorption efficiency of a side sill and to achieve weight reduction.

[0008] An object of the present invention is to increase the rigidity of a side sill and reduce manufacturing costs. [Means for solving the problem]

[0009] The vehicle side sill of the present invention may include a side sill frame formed to have a hollow portion, a partition member passing through the hollow portion to divide the hollow portion into a first hollow portion and a second hollow portion, a first reinforcing frame located in the first hollow portion and contacting the side sill frame and the partition member to form a closed cross section of the first hollow portion in a cross section in the thickness direction of the side sill frame, and a second reinforcing frame located in the second hollow portion and contacting the side sill frame and the partition member to form a closed cross section of the second hollow portion in a cross section in the thickness direction of the side sill frame.

[0010] At least one of the side sill frame, the partition member, the first reinforcement frame, and the second reinforcement frame may be made of steel.

[0011] The side sill frame may include a first side sill frame having the first hollow portion therein; and a second side sill frame joined to the first side sill frame and having the second hollow portion therein.

[0012] In addition, the cross-sectional shape of the first reinforcement frame in the thickness direction may include a plurality of first lower flange portions formed by bending both ends and joined to the inner surface of the first side sill frame, a plurality of first extension portions each connected to the first lower flange portions and extending in the direction of the partition member, and a first upper flange portion connected to the plurality of first extension portions and joined to the partition member.

[0013] In addition, the cross-sectional shape of the second reinforcement frame in the thickness direction may include a plurality of second lower flange portions formed by bending both ends and joined to the partition member, a plurality of second extension portions connected to the second lower flange portions and extending in the direction of the second side sill frame, and a second upper flange portion connected to the plurality of second extension portions and joined to an inner surface of the second side sill frame.

[0014] In addition, the first upper flange portion may be in continuous contact with the barrier member over a certain section and be joined to the barrier member.

[0015] In addition, the second upper flange portion may be in continuous contact with the second side sill frame over a certain section and be joined to the second side sill frame.

[0016] In addition, the cross-sectional shape of the first reinforcement frame in the thickness direction may include a plurality of first lower flange portions formed by bending both ends and joined to the partition member, a plurality of first extension portions respectively connected to the plurality of first lower flange portions and extending in the direction of the first side sill frame, and a first upper flange portion connected to the plurality of first extension portions and joined to an inner surface of the first side sill frame.

[0017] In addition, the cross-sectional shape of the second reinforcement frame in the thickness direction may include a plurality of second lower flange portions formed by bending both ends and joined to the inner surface of the second side sill frame, a plurality of second extension portions connected to the second lower flange portions and extending in the direction of the partition member, and a second upper flange portion connected to the plurality of second extension portions and joined to the partition member.

[0018] Furthermore, the first extension portion and the second extension portion may have different lengths.

[0019] In addition, in a cross section in a thickness direction of the side sill frame, the first hollow portion and the second hollow portion may be asymmetric.

[0020] In addition, the cross-sectional shape of the second reinforcement frame in the thickness direction may include a plurality of second lower flange portions formed by bending both ends and joined to the partition member, a plurality of second extension portions connected to the second lower flange portions and extending in the direction of the second side sill frame, and a second upper flange portion connected to the plurality of second extension portions and joined to the second side sill frame.

[0021] Also, the first extension portion and the second extension portion may have the same length.

[0022] In addition, in a cross section in a thickness direction of the side sill frame, the first hollow portion and the second hollow portion may be symmetrical.

[0023] At least one of the side sill frame, the partition member, the first reinforcement frame, and the second reinforcement frame may include a curved region.

[0024] At least one of the first reinforcement frame and the second reinforcement frame may have a cross-sectional shape in a length direction of the side sill frame that includes an uneven portion.

[0025] Also, the first and second reinforcement frames may be joined to the side sill frame or the partition member by at least one of welding and adhesive bonding. Effect of the Invention

[0026] According to the present invention, the collision energy absorption efficiency of the side sill can be improved and the weight of the side sill can be reduced.

[0027] According to the present invention, the rigidity of the side sill can be increased and the manufacturing cost can be reduced. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view of a vehicle side sill according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a front cross-sectional view of FIG. [Diagram 3] FIG. 3 is an enlarged view of the first reinforcing frame of FIG. 2. [Figure 4] FIG. 3 is an enlarged view of the second reinforcing frame of FIG. 2. [Diagram 5] FIG. 2 is a partial exploded view of FIG. [Figure 6] FIG. 1 is a cross-sectional view of a conventional vehicle side sill. [Figure 7] This shows the deformation analysis results of the vehicle side sill shown in Figure 1. [Figure 8] This shows the deformation analysis results of the vehicle side sill shown in Figure 1. [Figure 9] This shows the deformation analysis results of the vehicle side sill shown in Figure 1. [Figure 10] 7 is a force-displacement diagram of the vehicle side sill of FIG. 1 and the vehicle side sill of FIG. 6. [Figure 11] FIG. 11 is a perspective view of a side sill for a vehicle according to still another embodiment of the present invention. [Figure 12] FIG. 12 is a front cross-sectional view of FIG. [Figure 13] FIG. 13 is an enlarged view of the first reinforcing frame of FIG. 12. [Figure 14] FIG. 13 is an enlarged view of the second reinforcing frame of FIG. 12. [Figure 15] FIG. 12 is a partial exploded view of FIG. [Figure 16] FIG. 11 is a perspective view of a side sill for a vehicle according to still another embodiment of the present invention. [Figure 17] FIG. 17 is a front cross-sectional view of FIG. 16. [Figure 18] FIG. 18 is an enlarged view of the second reinforcing frame of FIG. 17. [Figure 19] These are A-A' and B-B' in Figure 1. [Figure 20] These are CC' and DD' in Figure 11. [Figure 21] These are E-E' and F-F' in Figure 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] In order to facilitate understanding of the description of the embodiments of the present invention, elements with the same reference numerals in the accompanying drawings are the same elements, and among components that perform the same function in each embodiment, related components are indicated by the same or extended numbers.

[0030] In order to clarify the gist of the present invention, a description of elements and techniques well known in the prior art will be omitted, and the present invention will be described in detail below with reference to the accompanying drawings.

[0031] However, the concept of the present invention is not limited to the embodiments shown, and other forms in which specific components are added, modified, or deleted may be proposed by those skilled in the art, which also fall within the scope of the same concept of the present invention.

[0032] Hereinafter, the X-axis shown in the accompanying drawings is the width direction of the side sill, the Y-axis is the length direction of the side sill, and the Z-axis is the height direction of the side sill.

[0033] As shown in FIG. 1, a vehicle side sill 100 according to one embodiment of the present invention may include a side sill frame 110 having a hollow portion 111, a partition member 120 dividing the hollow portion 111 of the side sill frame 110 into a first hollow portion 112 and a second hollow portion 113, a first reinforcing frame 130 positioned in the first hollow portion 112, and a second reinforcing frame 140 positioned in the second hollow portion 113.

[0034] The partition member 120 may be coupled to the side sill frame 110 so as to be positioned in a direction parallel to the Z axis.

[0035] The first reinforcement frame 130 may contact the side sill frame 110 and the partition member 120 to form a closed cross section in the first hollow portion 112 in a cross section in a thickness direction of the side sill frame.

[0036] The second reinforcement frame 140 may contact the side sill frame 110 and the partition member 120 to form a closed cross section in the second hollow portion in a cross section in a thickness direction of the side sill frame.

[0037] The first reinforcement frame 130 and the second reinforcement frame 140 may be coupled to the side sill frame 110 and the partition member 120 to be positioned parallel to the X-axis. When the first reinforcement frame 130, the second reinforcement frame 140 and the partition member 120 are arranged and coupled as described above, it is possible to easily form a closed cross section in a direction parallel to the X-axis, and also improve the assembling property of the vehicle side sill, thereby improving production efficiency.

[0038] When the side sill receives an impact from the side, i.e., in the X-axis direction, the first reinforcing frame 130, the second reinforcing frame 140, and the partition member 120 can minimize deformation of the side sill frame 110 in the Z-axis direction and induce the deformation to be concentrated in the X-axis direction. This can improve the collision energy absorption efficiency of the side sill and minimize the transmission of the collision impact to the passenger boarding area and the lower part of the vehicle where the battery is housed.

[0039] In one embodiment of the present invention, at least one of the side sill frame 110, the partition member 120, the first reinforcement frame 130, and the second reinforcement frame 140 may be made of steel, which may improve the collision energy absorption performance more than the side sill frame 110, the partition member 120, the first reinforcement frame 130, and the second reinforcement frame 140 made of aluminum of the same weight.

[0040] In an embodiment of the present invention, the first strengthening frame 130 and the second strengthening frame 140 may be made of a material including ultra-high strength steel having a tensile strength of 980 MPa or more.

[0041] In an embodiment of the present invention, the first reinforcement frame 130 and the second reinforcement frame 140 may be made of a material including 1180 TRIP steel.

[0042] In one embodiment of the present invention, the side sill frame 110 may be made of a material including 1470 MART steel.

[0043] However, this is not necessarily limited by the present invention, and can be appropriately modified and applied within the range of steel materials.

[0044] At least one of the side sill frame 110, the partition member 120, the first reinforcing frame 130, and the second reinforcing frame 140 may be formed by form forming or crash forming a steel plate, which may contribute to reducing manufacturing costs through reduction in mold costs, etc.

[0045] As described above, when the vehicle side sill is made of steel, its collision energy absorption capacity is at least equal to or exceeds that of a vehicle side sill made of aluminum of the same weight. Therefore, compared to when the side sill is made of aluminum, the side sill can be made lighter while still maintaining the same or higher collision energy absorption efficiency.

[0046] As shown in FIG. 2, in one embodiment of the present invention, the side sill frame 110 may include a first side sill frame 114 having the first hollow portion 112 therein, and a second side sill frame 115 joined to the first side sill frame 114 and having the second hollow portion therein.

[0047] The partition member 120 is located between the first side sill frame 114 and the second side sill frame 115, and one side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a first joint 121, and the other side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a second joint 122.

[0048] When a load is applied in the X-axis direction, the partition member 120 enables the first side sill frame 114 and the second side sill frame 115 to be stably compressed and deformed in the load direction. Therefore, the partition member 120 can play a role in improving the absorption ability of the collision energy.

[0049] The first reinforcement frame 130 has one side joined to the first side sill frame 114 and the other side joined to the partition member 120 to form a closed cross section at the first hollow portion 112 .

[0050] The second reinforcement frame 140 has one side joined to the barrier member 120 and the other side joined to the second side sill frame 115, thereby forming a closed cross section in the second hollow portion.

[0051] The partition member 120 may divide the first hollow portion 112 and the second hollow portion such that the first hollow portion 112 and the second hollow portion are asymmetric.

[0052] 3 shows a first strengthening frame 130 according to an embodiment of the present invention. The first strengthening frame 130 may be formed by bending a single steel plate. By bending a single steel plate, the mechanical strength of the first strengthening frame 130 can be further improved.

[0053] The cross-sectional shape of the first reinforcement frame 130 in the thickness direction may include a plurality of first lower flange portions 131 formed by bending both ends 132 and joined to the inner surface of the first side sill frame 114, a plurality of first extension portions 133 each connected to the first lower flange portions 131 and extending in the direction of the partition member 120, and a first upper flange portion 134 connected to the plurality of first extension portions 133 and joined to the partition member 120.

[0054] The first strengthening frame 130 may be bent so that the first extension portion 133 and the first lower flange portion 131 are alternately arranged.

[0055] The first extension portion 133 may be formed at an incline and may extend from the first hollow portion (112 in FIG. 2) to just before the partition member 120 while not contacting the first side sill frame (114 in FIG. 2). This makes it easy for the first reinforcement frame 130 to be compressed and deformed in the load direction when a load is applied in the X-axis direction.

[0056] In one embodiment of the present invention, the first upper flange portion 134 may be a flat surface. This can improve the adhesive strength of the first upper flange portion 134 when applying an adhesive or the like to the first upper flange portion 134, thereby improving the convenience of the bonding and assembly operations.

[0057] 4 shows a second strengthening frame 140 according to an embodiment of the present invention. The second strengthening frame 140 may be formed by bending a single steel plate. By bending a single steel plate, the mechanical strength of the second strengthening frame 140 can be further improved.

[0058] The cross-sectional shape of the second reinforcement frame 140 in the thickness direction may include a plurality of second lower flange portions 141 formed by bending both ends 142 and joined to the partition member 120, a plurality of second extension portions 143 connected to the second lower flange portions 141 and extending in the direction of the second side sill frame 115, and a second upper flange portion 144 connected to the plurality of second extension portions 143 and joined to the inner surface of the second side sill frame 115.

[0059] The second lower flange portion 141 and the second extension portion 143 may be formed to be inclined. The second lower flange portion 141 may be fixed in contact with a partition member (120 in FIG. 2), and the second extension portion 143 may extend to just before the second side sill frame 115 in the second hollow portion (113 in FIG. 2) without contacting the second side sill frame (115 in FIG. 2). This makes it easy for the second reinforcement frame 140 to be compressed and deformed in the load direction when a load is applied in the X-axis direction.

[0060] In one embodiment of the present invention, the second upper flange portion 144 may be a flat surface. Accordingly, when an adhesive or the like is applied to the second upper flange portion 144, the adhesive strength of the second upper flange portion 144 may be improved, and the convenience of the bonding and assembly operations may be improved.

[0061] As shown in FIG. 5, a first mating surface 135 may be present on the first upper flange portion (134 in FIG. 3), and a second mating surface 145 may be present on the second upper flange portion (144 in FIG. 4).

[0062] The first bonding surface 135 and the second bonding surface 145 may be flat, which may improve bonding performance.

[0063] The first upper flange portion 134 may be continuously present over a certain section in a direction parallel to the Y-axis and may be in contact with the barrier member 120 over a certain section.

[0064] The second upper flange portion 144 may be continuously present over a certain section in a direction parallel to the Y-axis, and may be in contact with the second side sill frame 115 over a certain section.

[0065] Therefore, the first bonding surface 135 and the second bonding surface 145 may exist continuously for a certain section in the Y-axis direction, and the entire first bonding surface 135 is bonded to the barrier member 120 and the entire second bonding surface 145 is bonded to the second side sill frame 115, thereby improving the bonding ability.

[0066] Meanwhile, at least one of the first side sill frame 114, the second side sill frame 115, the partition member 120, the first strengthening frame 130, and the second strengthening frame 140 may include a curved region.

[0067] According to an embodiment of the present invention, the first and second strengthening frames 130 and 140 may be configured to be bent in the Y-axis direction.

[0068] According to an embodiment of the present invention, the first lower flange portion 131, the second lower flange portion, the first extension portion (133 in FIG. 3) and the second extension portion (143 in FIG. 4) may be bent in a certain section in the Y-axis direction, thereby increasing the rigidity of the first reinforcement frame 130 and the second reinforcement frame 140.

[0069] 6 shows a cross section of a conventional vehicle side sill 10. The vehicle side sill 10 may include a plurality of side sill frames 11, 12 and reinforcing frames 13, 14 disposed therein.

[0070] Meanwhile, FIG. 7 shows a deformation analysis result of a crash test of the vehicle side sill 100 according to the embodiment of the present invention shown in FIG. 1, which is an analysis result of deformation at an early stage of a crash.

[0071] It can be seen that in the early stage of the collision, the second side sill frame 115 and the second reinforcing frame 140 are compressed and deformed in the X-axis direction.

[0072] Next, referring to FIG. 8, it can be seen that, at the middle stage of the collision, the first side sill frame 114, the first reinforcing frame 130, the second side sill frame 115, the second reinforcing frame 140, and the partition member 120 are compressively deformed in the X-axis direction, and that the amount of compressive deformation in the X-axis direction is greater than the amount of tensile deformation in the Z-axis direction.

[0073] Also, referring to FIG. 8, it can be seen that the first and second strengthening frames 130 and 140 according to the embodiment of the present invention are compressed uniformly in the X-axis direction without deformation being biased to one side.

[0074] FIG. 9 shows deformation at a later stage of collision. As shown in FIG. 9, the shortest distance in the Z-axis direction between the first tensile deformation portion S1 and the second tensile deformation portion S2 formed after the collision of the vehicle side sill is completed can be formed relatively narrow without widening. This can contribute to preventing the vehicle side sill from invading the area where the vehicle battery and passengers are present. In addition, it can be seen that the vehicle side sill 100 shown in FIG. 9 is easily compressed in the X-axis direction, further improving the load absorption capacity applied in the X-axis direction.

[0075] The load-displacement diagram shown in FIG. 10 indicates the load-displacement value of the vehicle side sill shown in FIG. 1 (100 in FIG. 1) as a first value L1, and the load-displacement value of the vehicle side sill shown in FIG. 6 (10 in FIG. 6) as a second value L2.

[0076] The displacement of the vehicle side sill (100 in FIG. 1) shown in FIG. 1 is based on the first lower flange portion (131 in FIG. 3) of the first reinforcing frame (130 in FIG. 3), and the displacement of the vehicle side sill (10 in FIG. 6) shown in FIG. 6 is based on the position corresponding to the first lower flange portion (131 in FIG. 3) of the vehicle side sill (100 in FIG. 1) shown in FIG. 1.

[0077] Referring to the first value L1 and the second value L2, it can be seen that the displacement of the vehicle side sill shown in FIG. 1 (100 in FIG. 1) is relatively smaller than that of the vehicle side sill shown in FIG. 6 (10 in FIG. 6) under the same load.

[0078] In particular, it can be seen that the maximum displacement of the vehicle side sill shown in Fig. 1 (100 in Fig. 1) occurs at a higher load than the maximum displacement of the vehicle side sill shown in Fig. 6 (10 in Fig. 6). Therefore, it can be seen that the vehicle side sill shown in Fig. 1 (100 in Fig. 1) has a higher collision energy absorption efficiency than the vehicle side sill shown in Fig. 6 (10 in Fig. 6).

[0079] FIG. 11 shows a vehicle side sill 100 according to still another embodiment of the present invention.

[0080] The vehicle side sill 100 may include a side sill frame having a hollow portion, a partition member 120 dividing the hollow portion of the side sill frame into a first hollow portion 112 and a second hollow portion, a first reinforcing frame 130 positioned in the first hollow portion 112, and a second reinforcing frame 140 positioned in the second hollow portion.

[0081] As shown in FIG. 12, the partition member 120 is disposed between the first side sill frame 114 and the second side sill frame 115, and one side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a first joint 121, and the other side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a second joint 122.

[0082] The first reinforcement frame 130 has one side joined to the first side sill frame 114 and the other side joined to the partition member 120 to form a closed cross section at the first hollow portion 112 .

[0083] The second reinforcement frame 140 has one side joined to the barrier member 120 and the other side joined to the second side sill frame 115, thereby forming a closed cross section in the second hollow portion.

[0084] The partition member 120 may divide the first hollow portion 112 and the second hollow portion such that the first hollow portion 112 and the second hollow portion are asymmetric.

[0085] As shown in FIG. 13, the cross-sectional shape in the thickness direction of the first reinforcement frame 130 is formed by folding both ends and includes a plurality of first lower flange portions 131 joined to the partition member (120 in FIG. 12), a plurality of first extension portions 133 each connected to the first lower flange portions 131 and extending in the direction of the first side sill frame (114 in FIG. 12), and a first upper flange portion 134 connected to the plurality of first extension portions 133 and joined to the inner surface of the first side sill frame (114 in FIG. 12).

[0086] As shown in FIG. 14, the cross-sectional shape in the thickness direction of the second reinforcement frame 140 is formed by bending both ends and may include a plurality of second lower flange portions 141 joined to the inner surface of the second side sill frame (115 in FIG. 12), a plurality of second extension portions 143 connected to the second lower flange portions 141 and extending in the direction of the partition member (120 in FIG. 12), and a second upper flange portion 144 connected to the plurality of second extension portions 143 and joined to the partition member (120 in FIG. 12).

[0087] The first and second strengthening frames 130 and 140 may be formed such that the first and second extensions 133 and 143 have different lengths.

[0088] As shown in FIG. 15, a first mating surface 135 may be present on the first upper flange portion (134 in FIG. 13), and a second mating surface 145 may be present on the second upper flange portion (144 in FIG. 14).

[0089] The first bonding surface 135 and the second bonding surface 145 may be flat, which may improve bonding performance.

[0090] The first joint surface 135 is joined to the inner surface of the first side sill frame 114 in its entirety, and the second joint surface 145 is in contact with the partition member 120 in its entirety, so that the joining ability can be improved.

[0091] Meanwhile, a vehicle side sill according to another embodiment of the present invention is shown in Fig. 16. According to this, the vehicle side sill 100 includes a side sill frame having a hollow portion, a partition member 120 dividing the hollow portion of the side sill frame into a first hollow portion 112 and a second hollow portion, a first reinforcing frame 130 located in the first hollow portion 112, and a second reinforcing frame 140 located in the second hollow portion.

[0092] As shown in FIG. 17, the side sill frame may include a first side sill frame 114 having the first hollow portion 112 therein, and a second side sill frame 115 joined to the first side sill frame 114 and having the second hollow portion therein.

[0093] The partition member 120 is located between the first side sill frame 114 and the second side sill frame 115, and one side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a first joint 121, and the other side of the partition member 120 may be joined to the first side sill frame 114 and the second side sill frame 115 to form a second joint 122.

[0094] The first reinforcement frame 130 has one side joined to the first side sill frame 114 and the other side joined to the partition member 120 to form a closed cross section at the first hollow portion 112 .

[0095] The second reinforcement frame 140 has one side joined to the barrier member 120 and the other side joined to the second side sill frame 115, thereby forming a closed cross section in the second hollow portion.

[0096] As shown in FIG. 18, the barrier member 120 may divide the first hollow portion (112 in FIG. 17) and the second hollow portion into symmetrical portions.

[0097] In addition, the first strengthening frame ( 130 in FIG. 17) and the second strengthening frame 140 may also be provided in a shape symmetrical to each other with respect to the barrier member 120 .

[0098] Therefore, the shape of the second reinforcing frame 140 shown in FIG. 18 can be similarly applied to the shape of the first reinforcing frame (130 in FIG. 17).

[0099] The cross-sectional shape of the second reinforcement frame 140 in the thickness direction is formed by folding both ends and may include a plurality of second lower flange portions 141 joined to the partition member 120, a plurality of second extension portions 143 connected to the second lower flange portions 141 and extending in the direction of the second side sill frame 115, and a second upper flange portion 144 connected to the plurality of second extension portions 143 and joined to the second side sill frame 115.

[0100] At this time, since the shapes of the first reinforcement frame (130 in FIG. 17) and the second reinforcement frame 140 are symmetrical, the cross-sectional shape in the thickness direction of the first reinforcement frame (130 in FIG. 17) is also formed by folding both ends (not shown) and may include a plurality of first lower flange portions (not shown) joined to the partition member 120, a plurality of first extension portions (not shown) respectively connected to the first lower flange portions and extending in the direction of the first side sill frame 114, and a first upper flange portion (not shown) connected to the plurality of first extension portions (not shown) and joined to the inner surface of the first side sill frame 114.

[0101] According to still another embodiment of the present invention, the first reinforcement frame (130 in FIG. 17) and the second reinforcement frame 140 may face each other with the barrier member 120 interposed therebetween.

[0102] In this case, the length of the first extension portion (not shown) of the first strengthening frame 130 and the length of the second extension portion 143 of the second strengthening frame 140 may be the same.

[0103] 19 shows A-A' and B-B' of Fig. 1. Referring to this, it can be seen that the first reinforcing frame 130 and the second reinforcing frame 140 have uneven portions 150 in their cross-sectional shapes in the Y-axis direction.

[0104] The uneven portion 150 may be continuously present over a certain section in the Y-axis direction, and may have a shape in which protrusions 151 and recesses 152 are alternately arranged.

[0105] The protrusions 151 and the recesses 152 may be formed in the first strengthening frame 130 and the second strengthening frame 140 such that the X-axis direction is the length direction. Accordingly, when a load is applied in the X-axis direction, the length directions of the protrusions 151 and the recesses 152 are positioned parallel to the load direction, so that the first strengthening frame 130 and the second strengthening frame 140 may be more easily compressed and deformed in the X-axis direction.

[0106] 11. Also, FIG. 20 shows CC' and DD' in FIG. 11, and FIG. 21 shows EE' and FF' in FIG.

[0107] 1, in each embodiment of the present invention, the first reinforcement frame 130 and the second reinforcement frame 140 have a cross-sectional shape including a concave-convex portion 150 in the Y-axis direction.

[0108] In addition, the uneven portion 150 may be continuously present over a certain section in the Y-axis direction, and may have a shape in which protrusions 151 and recesses 152 are alternately arranged.

[0109] Meanwhile, in each embodiment of the present invention, the first reinforcement frame 130 and the second reinforcement frame 140 may be joined to the side sill frame (e.g., 110 in FIG. 1) or the partition member (e.g., 120 in FIG. 1) by at least one of welding and adhesive bonding.

[0110] As shown in FIG. 1, in one embodiment of the present invention, the first lower flange portion (131 in FIG. 3) of the first reinforcement frame 130 may be spot welded to the first side sill frame 114.

[0111] As shown in FIG. 2, in one embodiment of the present invention, the partition member 120 may be spot welded to the first side sill frame 114 and the second side sill frame 115 to form a first joint portion 121.

[0112] As shown in FIG. 2, in one embodiment of the present invention, the second lower flange portion (141 in FIG. 4) of the second reinforcement frame 140 may be spot welded to the diaphragm member 120.

[0113] As shown in FIG. 5, in one embodiment of the present invention, the first bonding surface 135 of the first reinforcement frame 130 may be bonded to the barrier member 120 with an adhesive.

[0114] As shown in FIG. 5, in one embodiment of the present invention, the second joint surface 145 of the second reinforcement frame 140 may be joined to the second side sill frame 115 with an adhesive.

[0115] This makes it possible to maximize the bonding strength between the various components of the vehicle side sill.

[0116] This improves the ease of assembly of the vehicle side sill, thereby making the work more convenient.

[0117] This can contribute to reducing the manufacturing costs of vehicle side sills.

[0118] The above description has been given of one embodiment of the present invention, but it will be apparent to those skilled in the art that the scope of the present invention is not limited thereto, and that various modifications and variations are possible without departing from the technical idea of ​​the present invention as described in the claims. [Explanation of symbols]

[0119] 110 Side sill frame 114 First side sill frame 115 Second side sill frame 120 Diaphragm member 121 1st joint 122 2nd joint 130 first reinforcement frame 131 first lower flange portion 133 First extension portion 134 First upper flange portion 135 first joint surface 140 second reinforcement frame 141 second lower flange portion 143 second extension portion 144 second upper flange portion 145 second joint surface 150 Uneven part 151 Projection part 152 Recess

Claims

1. A side sill frame formed to have a hollow portion; a partition member passing through the hollow portion and dividing the hollow portion into a first hollow portion and a second hollow portion; a first reinforcing frame positioned in the first hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the first hollow portion in a cross section in a thickness direction of the side sill frame; and a second reinforcing frame positioned in the second hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the second hollow portion in a cross section in a thickness direction of the side sill frame; The side sill frame is A first side sill frame having the first hollow portion therein; and a second side sill frame joined to the first side sill frame, the second hollow portion being present therein; The cross-sectional shape of the first reinforcement frame in the thickness direction is a plurality of first lower flange portions each having both ends bent and joined to an inner surface of the first side sill frame; a plurality of first extensions each connected to the plurality of first lower flange portions and extending in a direction toward the diaphragm member; and a first upper flange portion connected to the first plurality of extensions and joined to the diaphragm member; The cross-sectional shape of the second reinforcement frame in the thickness direction is a plurality of second lower flange portions each having opposite ends bent and joined to the diaphragm member; a plurality of second extension portions connected to the plurality of second lower flange portions and extending in a direction toward the second side sill frame; and a second upper flange portion connected to the second plurality of extension portions and joined to an inner surface of the second side sill frame; At least one of the first extensions and the second extensions is A side sill for a vehicle includes an uneven portion in which protrusions and recesses are alternately arranged continuously for a certain section along the length direction of the side sill frame.

2. 2. The vehicle side sill according to claim 1, wherein at least one of the side sill frame, the partition member, the first reinforcing frame and the second reinforcing frame is made of steel.

3. The first upper flange portion is The vehicle side sill according to claim 1 , wherein the barrier member is in continuous contact with the barrier member over a certain section and joined to the barrier member.

4. The second upper flange portion is The side sill for a vehicle according to claim 1 , wherein the second side sill frame is in continuous contact with the second side sill frame for a certain section and joined to the second side sill frame.

5. A side sill frame formed to have a hollow portion; a partition member passing through the hollow portion and dividing the hollow portion into a first hollow portion and a second hollow portion; a first reinforcing frame positioned in the first hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the first hollow portion in a cross section in a thickness direction of the side sill frame; and a second reinforcing frame positioned in the second hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the second hollow portion in a cross section in a thickness direction of the side sill frame; The side sill frame is A first side sill frame having the first hollow portion therein; and a second side sill frame joined to the first side sill frame, the second hollow portion being present therein; The cross-sectional shape of the first reinforcement frame in the thickness direction is a plurality of first lower flange portions each having opposite ends bent and joined to the diaphragm member; a plurality of first extension portions each connected to the plurality of first lower flange portions and extending in a direction toward the first side sill frame; and a first upper flange portion connected to the first plurality of extension portions and joined to an inner surface of the first side sill frame; The cross-sectional shape of the second reinforcement frame in the thickness direction is a plurality of second lower flange portions each having both ends bent and joined to an inner surface of the second side sill frame; a plurality of second extensions connected to the plurality of second lower flange portions and extending in a direction toward the diaphragm member; and a second upper flange portion connected to the second plurality of extensions and joined to the diaphragm member; At least one of the first extensions and the second extensions is A side sill for a vehicle includes an uneven portion in which protrusions and recesses are alternately arranged continuously for a certain section along the length direction of the side sill frame.

6. The side sill for a vehicle according to claim 1 or 5, wherein a length of the first extension portion and a length of the second extension portion are different from each other.

7. The vehicle side sill according to claim 6 , wherein the first hollow portion and the second hollow portion are asymmetric in a cross section in a thickness direction of the side sill frame.

8. A side sill frame formed to have a hollow portion; a partition member passing through the hollow portion and dividing the hollow portion into a first hollow portion and a second hollow portion; a first reinforcing frame positioned in the first hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the first hollow portion in a cross section in a thickness direction of the side sill frame; and a second reinforcing frame positioned in the second hollow portion and in contact with the side sill frame and the partition member to form a closed cross section in the second hollow portion in a cross section in a thickness direction of the side sill frame; The side sill frame is A first side sill frame having the first hollow portion therein; and a second side sill frame joined to the first side sill frame, the second hollow portion being present therein; The cross-sectional shape of the first reinforcement frame in the thickness direction is a plurality of first lower flange portions each having opposite ends bent and joined to the diaphragm member; a plurality of first extension portions each connected to the plurality of first lower flange portions and extending in a direction toward the first side sill frame; and a first upper flange portion connected to the first plurality of extension portions and joined to an inner surface of the first side sill frame; The cross-sectional shape of the second reinforcement frame in the thickness direction is a plurality of second lower flange portions each having opposite ends bent and joined to the diaphragm member; a plurality of second extension portions connected to the plurality of second lower flange portions and extending in a direction toward the second side sill frame; and a second upper flange portion connected to the second plurality of extensions and joined to the second side sill frame; At least one of the first extensions and the second extensions is A side sill for a vehicle includes an uneven portion in which protrusions and recesses are alternately arranged continuously for a certain section along the length direction of the side sill frame.

9. The side sill for a vehicle according to claim 8 , wherein a length of the first extension portion and a length of the second extension portion are the same.

10. The vehicle side sill according to claim 9 , wherein the first hollow portion and the second hollow portion are symmetrical in a cross section in a thickness direction of the side sill frame.

11. The first reinforcement frame and the second reinforcement frame are 9. The vehicle side sill according to claim 1, 5 or 8, which is joined to the side sill frame or the diaphragm member by at least one of welding and adhesive bonding.

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