Design for the lower vehicle section

Abstract

Design for a lower vehicle section, comprising: a pair of right and left side elements (2) which are provided on the side sections of a lower surface of a floor plate (1) in the transverse direction of the vehicle and extend in the longitudinal direction of the vehicle; a power source element (3) provided between the pair of right and left side elements (2); and a transverse element (4) extending in the transverse direction of the vehicle and connecting the pair of right and left side elements (2) together; characterized in that the transverse element (4) comprises: a main section (41) with a closed cross-sectional structure to which the power source element (3) is attached; and flange sections (42) which are attached to the side elements (2); each of the side elements (2) and each of the flange sections (42) are connected to each other by means of a support element (6) and a closed cross-section (S1) is formed by connecting the support element (6) with the transverse element (4); the closed cross-section (S1) is arranged in a position that projects beyond an edge region (R) between the main section (41) and the flange section (42) in the transverse direction of the vehicle; and the support element (6) comprises a transverse element-side fastening section (61) which is attached to the transverse element (4) in a position on the inside in the transverse direction of the vehicle.

Description

[Technical field]

[0001] The present invention relates to a construction for the lower vehicle section comprising a pair of right and left side elements provided on the side sections of a lower surface of a floor plate in the transverse direction of the vehicle and extending in the longitudinal direction of the vehicle, a power source element provided between the pair of right and left side elements, and a transverse element extending in the transverse direction of the vehicle and connecting the pair of right and left side elements. [General state of the art]

[0002] In vehicles such as electric and hybrid vehicles, a power source element, such as a traction battery, is mounted, and this power source element is located in a lower section of the vehicle, such as under the floor, according to the vehicle's design. Therefore, it is necessary to implement measures in electric and hybrid vehicles and similar vehicles to prevent damage to the power source element, particularly due to impact loads during a side collision. By incorporating a ductility element on a flange section to which a battery frame (transverse element) is attached, and which supports the battery with a lower element (side element), some vehicles, according to the prior art, have a design to prevent damage to the flange section towards the bottom section of the battery frame in the event of impact loads during a side collision (see, for example, patent literature 1).

[0003] Furthermore, various designs of underbody structures and battery arrangements are known from the prior art, in which a power source element is arranged between two side elements spaced apart in the transverse direction of the vehicle and is held by transverse elements or crossbeams. For example, the generic patent JP 2012-71 764 A discloses a battery mounting structure with a rectangular, hollow frame that surrounds the battery below the vehicle floor and is connected to the vehicle chassis. Cylindrical reinforcement elements increase rigidity, and additional cross braces and protective covers improve stability and ease of maintenance.

[0004] JP 2017-193 299 A describes a battery installation structure in which a battery module is arranged between two side beams and an overlying floor panel is reinforced by crossbeams that transfer the forces introduced by the seats directly to the battery module.

[0005] EP 2 468 609 A2 discloses a system in which a battery compartment integrated into the vehicle structure is provided with several cross members that divide the batteries into groups and absorb and distribute energy in the event of a side impact.

[0006] DE 10 2011 118 181 A1 describes a cross member for a motor vehicle body which forms a load-bearing connection between two longitudinal members and at the same time provides storage space for objects or vehicle components, such as batteries.

[0007] JP H05-28 789 U reveals an underbody structure in which a battery is mounted on a panel between a side sill and an inner frame. Below the panel is an air deflector forming a closed cavity through which air flows to cool the battery while driving. [List of cited publications][Patent literature] [Patent Literature 1] JP 2014- 80 117A [Patent literature 2] JP 2012- 71 764 A [Patent literature 3] JP 2017- 193 299 A [Patent Literature 4] EP 2 468 609 A2 [Patent literature 5] DE 10 2011 118 181 A1 [Patent Literature 6] JP ​​H05- 28 789 U [Summary of the invention][Problems to be solved by the invention]

[0008] However, the design for the lower vehicle section according to patent literature 1 features a construction that bends and deforms the flange section towards the bottom section of the battery frame in the event of a side collision. This results in insufficient load distribution and load absorption, raising concerns that more collision objects could be transmitted to the inside of the vehicle.

[0009] Patent reference 2 describes a design in which several crossbars extending in the direction of the vehicle width are arranged between two side elements running in a front-to-back direction. Similar designs are known from patent references 3 to 6.

[0010] The design for the lower vehicle section according to the previous state of the art can be improved with regard to the protection of the power source element from the impact load in a side collision and with regard to the avoidance of damage to the power source element, which is an important component.

[0011] The present invention was made in light of the circumstances described above, and one objective pursued with this invention is to provide a construction for the lower vehicle section which can prevent the bending deformation of a transverse element by effectively transferring and distributing an impact load arising in a side collision to a transverse element by providing a support element which, in a predetermined position, forms a closed cross-section by being connected to the transverse element. [Means of solving the problems]

[0012] This problem is solved by the features of claim 1. To solve the problem according to the prior art (as described above), the present invention, starting from the generic patent literature 2, provides a construction for the lower vehicle section comprising: a pair of left and right side elements provided on lateral sections of a lower surface of a floor panel in the transverse direction of the vehicle and extending longitudinally in the vehicle; a power source element provided between the pair of left and right side elements; and a transverse element extending transversely in the vehicle and connecting the pair of left and right side elements.According to the invention, the transverse element itself comprises the following: a main section with a closed cross-sectional structure to which the power source element is attached; and flange sections attached to the side elements, wherein each side element and each flange section are connected to each other via a support element, and a closed cross-section is formed by the connection of the support element and the transverse element; the closed cross-section is arranged in a position which projects beyond an edge region between the main section and the flange section in the transverse direction of the vehicle; and the support element comprises a transverse-element-side fastening section which is attached to the transverse element in a position on the inside of the vehicle in the transverse direction of the vehicle. [Advantageous effects of the invention]

[0013] As described above, the construction for the lower vehicle section according to the present invention comprises the following: the pair of left and right side elements provided on the lateral sections of the lower surface of the floor plate in the transverse direction of the vehicle and extending in the longitudinal direction of the vehicle; the power source element provided between the pair of left and right side elements; and the transverse element extending in the transverse direction of the vehicle and connecting the pair of left and right side elements, the transverse element itself comprising: the main section with the closed cross-sectional structure to which the power source element is attached;as well as the flange sections which are attached to the side elements, wherein each side element and each flange section are connected to each other via the support element and a closed cross-section is formed by the connection of the support element and the transverse element; the closed cross-section is arranged in a position which projects beyond the edge area between the main section and the flange section in the transverse direction of the vehicle; and the support element comprises the transverse-element-side attachment section which is attached to the transverse element in a position on the inside of the vehicle in the transverse direction of the vehicle.

[0014] Therefore, in the design for the lower vehicle section according to the present invention, the impact load on the side element from the outside of the vehicle in the event of a side collision is absorbed by the support element, which forms the closed cross-section at the predetermined position by being connected to the transverse element. Bending deformation and folding between the main section and the flange section of the transverse element are avoided, and the load in the transverse direction of the vehicle is effectively transferred and distributed from the side element via the support element to the transverse element, so that the power source element, which is an important component, is protected from the impact load in the event of a side collision. [Brief description of the drawings] [ Fig. 1] Fig. Figure 1 is a perspective view of the entirety of a floor panel, the side elements, the transverse elements and the like in a construction for the lower vehicle section according to an embodiment of the present invention, seen from under the vehicle. [ Fig. 2] Fig. 2 is a perspective view showing the enlarged part Z in Fig. 1 represents. [ Fig. 3] Fig. Figure 3 is a sectional view along line AA in Fig. 2. [ Fig. 4] Fig. Figure 4 is a perspective section view along line BB in Fig. 2. [ Fig. 5] Fig. 5 is a section view along line CC in Fig. 2. [ Fig. 6] Fig. Figure 6 is a perspective view illustrating the positional relationship between the transverse element, a support element and an element for fastening support in the construction for the lower vehicle section according to the embodiment of the present invention. [ Fig. 7] Fig. Figure 7 is a top view of the support element in the construction for the lower vehicle section according to the embodiment of the present invention. [Emphasis of the invention]

[0015] The present invention is described in detail with reference to an embodiment illustrated in the drawings.

[0016] Note: In the drawings, the direction of arrow Fr indicates the front of the vehicle, and the direction of arrow I indicates the inside in the transverse direction of the vehicle. Furthermore, the direction of arrow X indicates the transverse direction of the vehicle, and the direction of arrow Y indicates the longitudinal direction of the vehicle.

[0017] The Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 represents a construction for the lower vehicle section according to the exemplary embodiment of the present invention. As in Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the construction for the lower vehicle section according to this embodiment comprises a pair of left and right side elements 2, which are provided in the transverse direction of the vehicle on lateral sections of the lower surface of a floor plate 1, which extends in the transverse and longitudinal directions of the vehicle, and which extend longitudinally in the vehicle; a power source element (traction battery, battery pack, and the like) 3, which is provided between the pair of left and right side elements 2 and is attached under the floor plate 1; and several transverse elements 4, which extend in the transverse direction of the vehicle and connect the pair of left and right side elements 2 to each other. The transverse elements 4 are located – with respect to the power source element 3 – on the lower side of the vehicle and are arranged so that they are positioned at a distance from each other in the longitudinal direction of the vehicle.Note: A pair of left and right side sills 5, extending in the longitudinal direction of the vehicle, are provided on the outer sides of the side elements 2 in the transverse direction of the vehicle.

[0018] The transverse element 4 according to the present embodiment comprises a main section 41 with a closed cross-sectional structure, to which the power source element 3 is attached in a mounting section D, and flange sections 42, which are attached to the side elements 2. The main section 41 is located in a central section of the transverse element 4 in the transverse direction of the vehicle and comprises a pair of upper and lower element bodies 41a and 41b, which are arranged vertically spaced apart from one another. The flange sections 42 are located at the end sections on the outside of the transverse element 4 in the transverse direction of the vehicle and are connected to the pair of upper and lower element bodies 41a and 41b, so that the open ends on the outside of the main section 41 in the transverse direction of the vehicle are closed from the perspective of the rear of the vehicle.

[0019] In the design for the lower vehicle section according to the present embodiment, as described in Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the side element 2 and the flange section 42 of the transverse element 4 are connected to each other by means of a support element 6. The connection of the support element 6 and the transverse element 4 creates a closed cross-section S1, which increases the stiffness around the attachment section of the support element 6. Additionally, the closed cross-section S1 is positioned so that it projects beyond an edge region R between the main section 41 and the flange section 42 of the transverse element 4 in the transverse direction of the vehicle. This arrangement allows the position of the stress concentration point of the attachment section between the side element 2 and the transverse element 4 to be changed. Furthermore, the support element 6 includes a transverse-element-side attachment section 61, which is fastened to the main section 41 of the transverse element 4 in a position on the inside in the transverse direction of the vehicle. Moreover, as shown in Figure 5, the support element 6 is also connected to the transverse element 4. Fig. Figure 5 shows a closed cross-section in the end section S2, formed by the main section 41 and the flange section 42 of the transverse element 4, provided under the closed cross-section S1, which is located on the outside of support element 6 in the transverse direction of the vehicle, and the closed cross-section in the end section S2 is connected to the closed cross-section of main section 41 with the closed cross-sectional structure to facilitate the transfer of the load to the fastening section between side element 2 and the transverse element 4 in the transverse direction of the vehicle.

[0020] As in Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the support element 6, according to the present embodiment, is four-sided when viewed from the top of the vehicle and comprises a side-element-side mounting section 62, which is attached to the lower surface 2a of the side element 2, and an inclined surface 63, which extends from the end section on the inside of the side-element-side mounting section 62 in the transverse direction of the vehicle to the transverse-element-side mounting section 61 and is inclined downwards towards the inside in the transverse direction of the vehicle. In other words, the support element 6 is created as follows by machining a surface-like element.The central section, adjacent to an inner side section 6a in the transverse direction of the vehicle and a front side section 6b and a rear side section 6c in the longitudinal direction of the vehicle, is curved towards the upper side of the vehicle on the support element 6 and is trapezoidal in shape when viewed from the vehicle side. Three of its sides extend radially away from the side-element mounting section 62, which serves as the center, and the lower surfaces of the inner side section 6a, the front side section 6b, and the rear side section 6c are connected to the transverse element 4. Note: A through-hole 65, through which a shaft section of a fastening screw described below is inserted, is formed in the side-element mounting section 62.

[0021] Consequently, the load from side element 2 is smoothly transferred via the side element-side fastening section 62 and the inclined surface 63 of the support element 6 to the side of transverse element 4, and the local concentration of the load is avoided.

[0022] In addition, the inclined surface 63 of the support element 6 according to the present embodiment, as shown in Fig. Figure 7 shows several ridge lines 64 extending from the corner sections 62a, located on the inside of the side-element-side mounting section 62, in the transverse direction of the vehicle to the transverse-element-side mounting section 61. The ridge lines 64 are spaced apart from each other in the longitudinal direction of the vehicle at the front and rear sections of the inclined surface 63. Consequently, due to the inclined surface 63, including the ridge lines 64 as described above, the load is effectively transferred from the side-element-side mounting section 62 of the support element 6 in the transverse direction of the vehicle along the ridge lines 64 and distributed to the side of the transverse element 4 by means of the transverse-element-side mounting section 61, thus avoiding local load concentration.

[0023] Meanwhile, according to the present embodiment, the transverse element 4 comprises, as shown in Fig. 2 and Fig. Figure 3 shows a curved section 43 that curves inwards in the transverse direction of the vehicle in the edge region R between the main section 41 and the flange section 42. In other words, the curved section 43 essentially has an S-shape, is positioned horizontally, and curves inwards in the transverse direction of the vehicle from the flange section 42 on the upper side of the transverse element 4 to the lower element body 41b of the main section 41, and the peripheral section of the curved section 43 is connected to the lower element body 41b of the main section 41.Because the arched section 43 has the shape described above, a construction is possible with which the change in the cross-sectional area of ​​the closed cross-section overall, which arises from the addition of the closed cross-section S1 on the side of support element 6 to the closed cross-section in the main section 41 of transverse element 4, is reduced and the area of ​​the closed cross-sectional area overall is preserved.

[0024] Furthermore, the arched section 43 of transverse element 4 possesses a stiffness with respect to the load in the vertical direction of the vehicle. Therefore, the arched section 43 is positioned so that it projects beyond the inclined surface 63 of the support element 6 in the transverse direction of the vehicle. This results in a design where, if the load were concentrated on the section where the arched section 43 and the main section 41 are connected, causing deformation, it would be transferred to the inclined surface 63. This avoids the load concentration on the arched section 43, as the arched section 43 is located in close proximity to the inclined surface 63.

[0025] As in Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the cross-section of side element 2 in the present embodiment is essentially U-shaped, including the flat lower surface 2a and the two left and right side walls 2b and 2c, which are located on the inside and outside of the lower surface 2a in the transverse direction of the vehicle and extend towards the upper side of the vehicle. Side element 2 includes a cylindrical fastening element 7, which connects the side element 2 and the transverse element 4, and a reinforcement 21, which connects both the left and right side walls 2b and 2c of the side element 2. This creates an internal thread in the inner circumferential surface of the fastening element 7 for screwing into an external thread of the shank section of the fastening screw 8, with which the side element 2 and the transverse element 4 are connected.Additionally, the reinforcement 21 comprises a mounting surface 21a, located above the lower surface 2a of the side element 2 and spaced apart from the lower surface 2a; side surfaces 21b and 21c, which are connected to the left and right side walls 2b and 2c of the side element 2; and a mounting hole 21d, into which the lower section of the fastening element 7 is inserted, is formed on the mounting surface 21a. Note: the insertion holes 2d, 41c, and 42a, through which the shank section of the fastening screw 8 is inserted, are formed on the lower surface 2a of the side element 2 and the main section 41, as well as the flange section 42 of the transverse element 4, so that they correspond to the through hole 65 of the support element 6 and the mounting hole 21d of the reinforcement 21.

[0026] The fastening element 7 comprises an upper section 7a with a small diameter at the top of the cylindrical body, a lower section 7b with a large diameter at the bottom of the cylindrical body, and a middle section 7c with a diameter between the diameters of the upper and lower sections 7a and 7b, respectively, vertically in the center of the cylindrical body. The fastening element 7 is vertically marginally longer than the interval between the lower surface 2a of the side element 2 and the mounting surface 21a of the reinforcement 21. The upper section 7a of the fastening element 7 projects through the mounting hole 21d to a position above the mounting surface 21a, and the middle section 7c is connected to the reinforcement 21 adjacent to the lower surface of the mounting surface 21a.The lower section 7b of the fastening element 7 is connected in a position on the lower surface 2a of the side element 2.

[0027] Consequently, a construction is created in which the load input on the right-hand side surface 2c of the side element 2 in the transverse direction of the vehicle is transferred to the transverse element 4 by means of the reinforcement 21 and the fastening element 7, and the transfer and distribution of the load are simplified.

[0028] Furthermore, as in Fig. 3, Fig. 5 and Fig.Figure 6 shows a cylindrical element 9 for fastening support, which provides support during fastening between the side element 2 and the transverse element 4, between the flange section 42 and the transverse element 4 and the support element 6 according to this embodiment. Therefore, the fastening support element 9 can be arranged vertically between the side-element-side fastening section 62 of the support element 6 and the upper element body 41a of the main section 41 of the transverse element 4 and has a vertical length that allows the lower and upper surfaces of the cylindrical body to abut the side-element-side fastening section 62 and the upper element body 41a. Additionally, the fastening support element 9 has an inner diameter that allows the fastening screw 8 to be inserted through it.Additionally, the fastening element 7 and the fastening support element 9 are fastened to each other via the fastening screw 8 and are designed so that the stiffness of the fastening screw 8 can be utilized in the transverse direction of the vehicle.

[0029] Consequently, the load input from the side element 2 is transferred to the transverse element 4 by means of the fastening support element 9, thus facilitating the load distribution.

[0030] As described above, the construction for the lower vehicle section according to the present embodiment of this invention comprises the pair of left and right side elements 2, which are provided on the side sections of the lower surface of the floor plate 1 in the transverse direction of the vehicle and extend in the longitudinal direction of the vehicle, the power source element 3, which is provided between the pair of left and right side elements 2, and the transverse element 4, which extends in the transverse direction of the vehicle and connects the pair of left and right side elements 2 to each other. The transverse element 4 comprises the main section 41 with the closed cross-sectional structure to which the power source element 3 is attached, and the flange section 42, which is connected to the side element 2.Furthermore, the side element 2 and the flange section 42 are attached to each other by means of the support element 6. The closed cross-section S1 is formed by connecting the support element 6 and the transverse element 4, and the closed cross-section S1 is arranged in a position that projects beyond the edge region R between the main section 41 and the flange section 42 in the transverse direction of the vehicle. Additionally, the support element 6 includes the transverse-element-side mounting section 61, which is attached to the transverse element 4 at a position on the inside in the transverse direction of the vehicle.In other words, in the design for the lower vehicle section according to the present embodiment, the support element 6, which forms the closed cross-section S1 by connection with the transverse element 4, is provided in a predetermined position, and therefore the impact load acting on the side element 2 from the outside of the vehicle in a side collision can be absorbed and the bending deformation and folding between the main section 41 and the flange section 42 of the transverse element 4 with respect to the load from the outside of the vehicle can be avoided.In addition, in the design for the lower vehicle section according to the present embodiment, the load in the transverse direction of the vehicle is effectively transferred and distributed from the side element 2 via the support element 6 to the transverse element 4, so that the power source element 3, which is an important component, can be effectively protected from the impact load in a side collision.

[0031] In addition, in the construction for the lower vehicle section according to the present embodiment, the support element 6 comprises the side element-side mounting section 62, which is attached to the lower surface 2a of side element 2, and the inclined surface 63, which extends from the end section of the inside of the side element-side mounting section 62 in the transverse direction of the vehicle to the transverse element-side mounting section 61, and is inclined downwards towards the inside in the transverse direction of the vehicle.

[0032] Therefore, in the design for the lower vehicle section according to the present embodiment, the load from side element 2 is transferred to the side of transverse element 4 in the event of a side collision by means of the side element-side mounting section 62 and the inclined surface 63 of support element 6, so that the local concentration of the load and the bending deformation of transverse element 4 can be avoided. Consequently, the effectiveness in protecting the power source element 3 from the impact load in a side collision can be further improved.

[0033] Furthermore, in the design for the lower vehicle section according to the present embodiment, the inclined surface 63 includes the ridge lines 64, which extend from the side-element-side mounting section 62 to the transverse-element-side mounting section 61. The ridge lines 64 are positioned at a distance from each other in the longitudinal direction of the vehicle on the front and rear sections of the inclined surface 63. Therefore, in the design for the lower vehicle section according to the present embodiment, the load input from the side-element-side mounting section 62 of the support element 6 is transferred in the transverse direction of the vehicle along the ridge lines 64 in the event of a side collision and distributed to the side of the transverse element 4 by means of the transverse-element-side mounting section 61, thus further avoiding the local concentration of the load.

[0034] Furthermore, in the design for the lower vehicle section according to the present embodiment, the transverse element 4 has the curved section 63, which curves inwards in the transverse direction of the vehicle into the edge region R between the main section 41 and the flange section 42. The curved section 43 is arranged in a position that projects beyond the inclined surface 63 in the transverse direction of the vehicle. Therefore, in the design for the lower vehicle section according to the present embodiment, the change in the cross-sectional area of ​​the entire closed cross-section, which is formed by the addition of the closed cross-section S1 formed by the support element 6 and the closed cross-section formed in the main section 41 of the transverse element 4, can be reduced, thus avoiding the load concentration on the curved section 43.

[0035] Furthermore, in the design for the lower vehicle section according to the present embodiment, the side element 2 essentially has a U-shaped cross-section, and the fastening element 7, which fastens the side element 2 and the transverse element 4 to each other, and the reinforcement 21, which connects the left and right side walls 2b and 2c of side element 2 respectively, are provided on the side element 2. The lower section 7a of fastening element 7 is connected to reinforcement 21, and the lower section 7b of fastening element 7 is connected to the lower surface 2a of side element 2.

[0036] Therefore, in the design for the lower vehicle section according to the present embodiment, when a load is applied to the lower surface 2a of side element 2 and the reinforcement 21 from the transverse direction of the vehicle, the fastening element 7 receives the load in the transverse direction in the connecting section between the reinforcement 21 and side element 2, so that the stiffness of the fastening element 7 can be utilized in the transverse direction of the vehicle. Additionally, in the design for the lower vehicle section according to the present embodiment, the load application to the right-hand side surface 2c on the outside of side element 2 in the transverse direction of the vehicle is transferred to the transverse element 4 by means of the reinforcement 21 and the fastening element 7, so that the transfer of the load in the transverse direction of the vehicle is facilitated and the impact load in a side collision can be distributed smoothly to the transverse element 4 and similar components.

[0037] Additionally, in the design for the lower vehicle section according to the present embodiment, the fastening support element 9, which supports the fastening between side element 2 and transverse element 4, is provided between the support element 6 and the flange section 42, so that the load input from the side element 2 can be smoothly transferred to the transverse element 4 by means of the fastening support element 9 and the effect of the load distribution can be further increased. [List of reference symbols] 1 floor plate 2 side element 2a lower surface 2b, 2c side wall 2D insertion hole 3 Power source element 4 transverse elements 6 support element 7 Fastening element 7a upper section 7b lower section 7c middle section 8 fastening screws 9 elements for fastening support 21 Reinforcement 21a Mounting surface 21b, 21c side surface 21d Mounting hole 41 Main section of the transverse element 41a upper element body 41b lower element body 41c Insertion hole 42 Flange section of the transverse element 42a Insertion hole 43 Arched section 61 transverse element-side fastening section 62 side element mounting section 63 inclined surface 64 Ridge line 65 Through hole R Edge area between main section and flange section of the transverse element S1 Closed cross-section

Claims

A construction for a lower vehicle section, comprising: a pair of right and left side elements (2) provided on the side sections of a lower surface of a floor plate (1) in the transverse direction of the vehicle and extending in the longitudinal direction of the vehicle; a power source element (3) provided between the pair of right and left side elements (2); and a transverse element (4) extending in the transverse direction of the vehicle and connecting the pair of right and left side elements (2); characterized in that the transverse element (4) comprises: a main section (41) with a closed cross-sectional structure to which the power source element (3) is attached; and flange sections (42) attached to the side elements (2);each of the side elements (2) and each of the flange sections (42) are connected to each other by means of a support element (6) and a closed cross-section (S1) is formed by connecting the support element (6) with the transverse element (4); the closed cross-section (S1) is arranged in a position that projects beyond an edge region (R) between the main section (41) and the flange section (42) in the transverse direction of the vehicle; and the support element (6) comprises a transverse-element-side fastening section (61) which is attached to the transverse element (4) in a position on the inside in the transverse direction of the vehicle. Construction for the lower vehicle section according to claim 1, characterized in that the support element (6) comprises: a side element-side mounting section (62) which is attached to a lower surface (2a) of the side element (2); and an inclined surface (63) which extends from the end section of the inside of the side element-side mounting section (62) in the transverse direction of the vehicle to the transverse element-side mounting section (61) and is inclined downwards in the transverse direction of the vehicle towards the inside. Construction for the lower vehicle section according to claim 2, characterized in that the inclined surface (63) comprises ridge lines (64) extending from the side element-side mounting section (62) to the transverse element-side mounting section (61) and provided at a distance from each other in the longitudinal direction of the vehicle on the front and rear sections of the inclined surface (63). Construction for the lower vehicle section according to claim 2 or 3, characterized in that the transverse element (4) comprises a curved section (43) which is curved towards the inside in the transverse direction of the vehicle in the edge region (R) between the main section (41) and the flange section (42), and the curved section (43) is arranged in a position which projects beyond the inclined surface (63) in the transverse direction of the vehicle. Construction for the lower vehicle section according to one of claims 1 to 4, characterized in that the side element (2) has a U-shaped cross-section, a fastening element (7) with which the side element (2) and the transverse element (4) are fastened to each other and a reinforcement (21) with which the left and right side wall (2b, 2c) of the side element (2) are connected to each other, are provided for the side element (2), and an upper section (7a) of the fastening element (7) is connected to the reinforcement (21) and a lower section (7b) of the fastening element (7) is connected to a lower surface (2a) of the side element (2). Construction for the lower vehicle section according to one of claims 1 to 5, characterized in that an element for fastening support (9) is provided between the support element (6) and the flange section (42), which provides support during fastening between the side element (2) and the transverse element (7).

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