Lower side structure of vehicle

Abstract

A lower side structure of a vehicle includes: a side sill outer member having a convex cross-sectional shape convexly curved toward an exterior of the vehicle; a center floor main panel having both side ends coupled to an upper end of the side sill outer member and forming a floor of the vehicle; and a lower member having both ends coupled to a lower end portion of the side sill outer member and assembled to a lower portion of the center floor main panel. In particular, a closed cross-section is formed between the side sill outer member, the center floor main panel, and the lower member.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a vehicle body structure of a vehicle. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] The vehicle is provided with a side sill formed in the longitudinal direction of the vehicle to form a lower side structure of the vehicle. The side sill is a structural member generally located below the door along the bottom edge of the vehicle body.

[0004] In the side sill, a side sill inner member provided in the vehicle interior is coupled to both end portions of a center floor panel forming a floor of the vehicle interior.

[0005] In an electric vehicle, a battery is typically disposed below a center floor panel. The battery is mounted by tightening a battery mounting bolt through the side member inner member. Alternatively, the battery is mounted by installing a separate mounting member in the side member inner member and by tightening the battery mounting bolt to the mounting member.

[0006] When a vehicle is involved in a side collision and there is no structure to support the collision load transmitted from the side of the vehicle, the side beam is deformed by the impact and intrudes into the passenger compartment of the vehicle. This deformation of the side beam causes injury to the occupants and damage to the battery.

[0007] Furthermore, since moisture may be introduced through a bonding surface between the side sill inner member and the center floor panel, a separate sealing process is required to prevent moisture from being introduced therebetween. Summary of the invention

[0008] An embodiment of the present invention relates to a lower side structure of a vehicle that supports a collision load transmitted from a side surface of the vehicle in the event of a side collision and prevents the lower side structure from being deformed toward the inside of the vehicle.

[0009] Other purposes and advantages of the present disclosure can be understood through the following description and become obvious with reference to the embodiments of the present disclosure. Likewise, it is obvious to those skilled in the art that the purposes and advantages of the present disclosure can be achieved through the claimed means and combinations thereof.

[0010] According to an embodiment of the present disclosure, a lower side structure of a vehicle includes: a side sill outer member having a convex cross-sectional shape convexly curved toward the outside of the vehicle; and a central floor main panel having two side ends coupled to an upper end of the side sill outer member. The central floor main panel forms a floor of the vehicle.

[0011] In one embodiment, the lower side structure may further include: a lower member having both ends coupled to the lower end of the side sill outer member and assembled to the lower portion of the center floor main panel. The side sill outer member, the center floor main panel and the lower member may form a closed section.

[0012] In one embodiment, the lower side structure may further include: a side sill outer bulkhead supported on an inner surface of the side sill outer member; and a side sill inner bulkhead positioned inside the vehicle compared to the side sill outer bulkhead, between the side sill outer member, the center floor main panel, and the lower member. The side sill inner bulkhead contacts the side sill outer bulkhead and is supported on inner surfaces of the center floor main panel and the lower member.

[0013] Surfaces at which the side sill outer bulkhead and the side sill inner bulkhead may contact each other may be formed to have a step portion.

[0014] A surface where the side sill outer bulkhead and the side sill inner bulkhead may contact each other may be bent toward the outside of the vehicle at an upper portion of the surface.

[0015] In another embodiment, the lower side structure may further include: a side beam outer reinforcement tube installed to pass through the side beam outer bulkhead; and a side beam inner reinforcement tube installed to pass through the side beam inner bulkhead and inserted from an end of the side beam outer reinforcement tube with a predetermined length.

[0016] The side sill outer reinforcement pipe and the side sill inner reinforcement pipe may be arranged above a step portion of a surface where the side sill outer bulkhead and the side sill inner bulkhead contact each other.

[0017] In another embodiment, a seat cross member arranged in the width direction of the vehicle may be assembled on the upper surface of the center floor main panel, and the seat cross member may be arranged in a portion where a side sill inner bulkhead is installed in the longitudinal direction of the vehicle.

[0018] In one embodiment, the center floor main panel may include: an upper joining portion joined to an upper end portion of a side beam outer member; an upper reinforcement portion formed from the upper joining portion to be spaced apart from the side beam outer member; and a center floor panel portion extending from the upper reinforcement portion toward an interior of the vehicle.

[0019] In one embodiment, the upper reinforcement portion may include: a horizontal portion extending from a lower end portion of the upper joining portion in a horizontal direction to be spaced apart from the side beam outer member; and a vertical portion extending downward from the horizontal portion.

[0020] In one embodiment, the lower member may include: a lower coupling portion coupled to a lower end portion of a side beam outer member; a lower reinforcement portion connected to the lower coupling portion and forming a closed cross-section with the side beam outer member; a panel coupling portion coupled to a bottom surface of a center floor main panel; and a battery mounting portion on which a battery is mounted.

[0021] In one embodiment, the lower reinforcement portion may include: a horizontal portion extending from an upper end portion of the lower joining portion in a horizontal direction to be spaced apart from the side beam outer member; and a vertical portion formed to extend upward from the horizontal portion.

[0022] The panel coupling portion may be formed to have an open bottom, and the battery mounting portion may be formed to have an open top.

[0023] The support member may be disposed inside the panel combining portion.

[0024] The support member may be arranged in a portion where a side sill outer bulkhead supported on an inner surface of the side sill outer member and a side sill inner bulkhead supported on inner surfaces of the center floor main panel and the lower member are installed.

[0025] The battery mounting member may be assembled to the battery mounting portion, and the battery fastening bolt is fastened to the battery mounting member.

[0026] Further areas of applicability will become apparent from the description provided herein.It should be understood that the above description and specific embodiments are intended for illustrative purposes only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order that the present disclosure may be better understood, various forms of the present disclosure given by way of example will now be described with reference to the accompanying drawings, in which:

[0028] Figure 1 is an external perspective view partially showing a lower side structure of a vehicle according to an embodiment of the present disclosure;

[0029] Figure 2 is an enlarged sectional perspective view showing a main portion of a lower side structure of a vehicle according to an embodiment of the present disclosure;

[0030] Figure 3 is an internal perspective view showing a lower side structure of a vehicle according to an embodiment of the present disclosure;

[0031] Figure 4 is an exploded perspective view showing a lower side structure of a vehicle according to an embodiment of the present disclosure;

[0032] Figure 5 is a perspective view showing a state in which a center floor main panel is removed from a lower side structure of a vehicle according to an embodiment of the present disclosure;

[0033] Figure 6 is a schematic cross-sectional view showing a lower side structure of a vehicle according to an embodiment of the present disclosure; and

[0034] Figure 7is a schematic diagram illustrating an assembly process of a lower side structure of a vehicle according to the present disclosure.

[0035] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0036] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0037] When a component, device, element, etc. of the present disclosure is described as having a purpose or performing an operation, function, etc., the component, device or element should be considered herein as being "configured to" satisfy the purpose or perform the operation or function.

[0038] Hereinafter, a lower side structure of a vehicle according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0039] According to the embodiments of the present disclosure, referring to Figures 1 to 7 , the lower side structure of the vehicle may include: a side beam outer member 21 having a convex cross-sectional shape convexly curved toward the outside of the vehicle; and a center floor main panel 22 having two side end portions coupled to an upper end portion 21a of the side beam outer member 21. The center floor main panel 22 forms a floor of the vehicle. The lower side structure further includes a lower member 23 having two side end portions coupled to a lower end portion 21b of the side beam outer member 21 and assembled to a lower portion of the center floor main panel 22, and the side beam outer member 21, the center floor main panel 22, and the lower member 23 form a closed section.

[0040] The side sill outer panel 11 may be assembled on the outer side of the side sill outer member 21 of the vehicle.

[0041] The side sill outer panel 11 may be directly or indirectly connected to a center pillar outer member 12 , a center pillar inner member 13 , and a center pillar outer panel 14 that are located above the side sill outer panel 11 and constitute the center pillar CP.

[0042] The top side rail 15 may be provided to be connected to an upper end portion of the center pillar CP.

[0043] like Figure 1 As shown, the side sill outer member 21 may have a convex cross-sectional shape convexly curved toward the vehicle outer side. The upper end portion 21a and the lower end portion 21b of the side sill outer member 21 may be respectively coupled to the center floor main panel 22 and the lower member 23 and may form a space therebetween.

[0044] Both side ends of the center floor main panel 22 may be joined to the upper end 21 a of the side sill outer member 21 , and the center floor main panel 22 may form a floor of the vehicle, thereby serving as an upper portion of the side sill inner member and a center floor panel in a conventional vehicle structure.

[0045] The center floor main panel 22 may be formed into a symmetrical structure in the width direction of the vehicle, and both side end portions of the center floor main panel 22 are joined to the upper end portions 21 a of the side sill outer members 21 .

[0046] Since the center floor main panel 22 is integrally formed to function as a conventional side sill inner member and a conventional center floor panel, there is no need to perform a separate sealing work on the upper surface of the center floor main panel 22 .

[0047] The shape of the central floor main panel 22 is described in detail. Figure 2 As shown, the center floor main panel 22 may include: an upper joint portion 22a joined to the upper end portion 21a of the side sill outer member 21; an upper reinforcement portion 22b formed from the upper joint portion 22a to be spaced apart from the side sill outer member 21; and a center floor panel portion 22c extending from the upper reinforcement portion 22b to the vehicle interior.

[0048] An upper joint portion 22a may be formed at an end of the center floor main panel 22. The upper joint portion 22a may be bent upward in parallel with the upper end portion 21a of the side sill outer member 21 bent upward. The upper joint portion 22a may be joined to the bent upper end portion 21a of the side sill outer member 21. The center floor main panel 22 may be joined to the side sill outer member 21 by a joining structure of the upper end portion 21a and the upper joint portion 22a.

[0049] The upper reinforcing portion 22b may be formed to extend from the upper joining portion 22a. The upper reinforcing portion 22b may be formed to allow the center floor main panel 22 to be spaced apart from the side beam outer member 21. In addition, the upper reinforcing portion 22b may be used as an upper portion of a conventional side beam inner member. To this end, the upper reinforcing portion 22b may include: a horizontal portion 22ba extending from a lower end portion of the upper joining portion 22a in a horizontal direction to be spaced apart from the side beam outer member 21; and a vertical portion 22bb extending vertically downward from the horizontal portion 22ba. The horizontal portion 22ba and the vertical portion 22bb may form a cross section bent from the center floor main panel 22, thereby providing rigidity.

[0050] The center floor panel portion 22c may extend from a lower end portion of the vertical portion 22bb toward the vehicle interior. The center floor panel portion 22c may form a floor of the vehicle.

[0051] In order to mount the seat on the center floor panel portion 22 c , the seat cross member 31 may be arranged in the width direction of the vehicle.

[0052] Furthermore, the first sub-member 32 and the second sub-member 33 may be arranged to intersect the seat cross member 31 in the center floor panel portion 22c in the longitudinal direction of the vehicle. Since the seat cross member 31 is provided perpendicularly to the first sub-member 32 and the second sub-member 33 on the upper surface of the center floor main panel 22, the rigidity of the center floor panel portion 22c formed in a plane may be improved.

[0053] Both side ends of the lower member 23 may be coupled to the lower end 21b of the side sill outer member 21, and the lower member 23 may be assembled to the lower portion of the center floor main panel 22. The lower member 23 may be formed with a predetermined length from the side sill outer member 21 in the width direction of the vehicle. The lower member 23 may be used as the lower portion of a conventional side sill inner member, and may be used to connect the side sill outer member 21 to the center floor main panel 22. In addition, in the case of an electric vehicle, a battery BAT of the vehicle may be mounted on the lower member 23.

[0054] The shape of the lower member 23 is described in detail. Figure 6 As shown, the lower member 23 may include: a lower joint portion 23a, which is joined to the lower end portion 21b of the side beam outer member 21; a lower reinforcement portion 23b, which is connected to the lower joint portion 23a and coupled to the side beam outer member 21 to form a closed cross-section; a panel joint portion 23c, which is joined to the bottom surface of the center floor main panel 22; and a battery mounting portion 23d, on which the battery BAT is mounted.

[0055] The lower joint portion 23a may be formed at a side end portion of the lower member 23. The lower joint portion 23a may be formed to extend downward from the vehicle. The lower joint portion 23a may extend downward in parallel to the lower end portion 21b of the side sill outer member 21 and may be coupled to the lower end portion 21b of the side sill outer member 21. The lower member 23 may be coupled to the side sill outer member 21 through the lower joint portion 23a.

[0056] The lower reinforcement 23b may be formed to extend from the lower joint 23a. The lower reinforcement 23b may be formed to allow the lower member 23 to be spaced apart from the side beam outer member 21. In addition, the upper reinforcement 22b may be used as the lower portion of a conventional side beam inner member. To this end, the lower reinforcement 23b may include: a horizontal portion 23ba extending from an upper end portion of the lower joint 23a in a horizontal direction to be spaced apart from the side beam outer member 21; and a vertical portion 23bb extending vertically upward from the horizontal portion 23ba. Similar to the upper joint 22a, the lower joint 23a, the horizontal portion 23ba, and the vertical portion 23bb may form a cross section bent from the lower member 23, thereby providing rigidity.

[0057] The panel joint portion 23c may be formed to have an open bottom, and the battery mounting portion 23d may be formed to have an open top. The panel joint portion 23c may be assembled to the central floor panel portion 22c of the central floor main panel 22, and thus the lower member 23 may be integrated with the central floor main panel 22. In order to improve the rigidity of the panel joint portion 23c, a groove (reference number not given) may be formed on the upper surface of the panel joint portion 23c along the longitudinal direction of the vehicle. In a state where the panel joint portion 23c is joined to the bottom surface of the central floor panel portion 22c, the upper surface of the panel joint portion 23c may be assembled to the central floor panel portion 22c.

[0058] In contrast to the panel joint portion 23c, the battery mounting portion 23d may be formed to have an open top. The battery mounting member 28 may be assembled to the battery mounting portion 23d. The battery mounting member 28 may be assembled to the battery mounting portion 23d in a state where the periphery of the battery mounting member 28 is in contact with the surface of the battery mounting portion 23d. The battery mounting member 28 may be assembled to the battery mounting portion 23d at intervals in the length direction of the vehicle. The battery fastening bolt 30 may pass through the battery mounting portion 23d to be fastened to the battery mounting member 28 so that the battery can be mounted at the lower portion of the vehicle.

[0059] Furthermore, the end of the battery mounting portion 23d, that is, the inner end of the lower member 23 may be assembled to the lower surface of the center floor panel portion 22c.

[0060] A closed section may be formed between the side sill outer member 21, the center floor main panel 22, and the lower member 23 in the longitudinal direction of the vehicle to form a side sill, thereby forming a lower side structure of the vehicle. In particular, the upper joint portion 22a of the center floor main panel 22 and the lower joint portion 23a of the lower member 23 may be used as the upper and lower portions of a conventional side sill inner member and assembled to the side sill outer member 21, so that a side sill structure is formed.

[0061] Meanwhile, in the present disclosure, a structure capable of supporting a collision load in the event of a side collision of the vehicle may be additionally applied between the side sill outer member 21 , the center floor main panel 22 , and the lower member 23 .

[0062] In an embodiment of the present disclosure, a side sill outer bulkhead 24 and a side sill inner bulkhead 25 may be applied between the side sill outer member 21 , the center floor main panel 22 , and the lower member 23 .

[0063] The side sill outer bulkhead 24 and the side sill inner bulkhead 25 can support the inside of the closed cross-sectional space formed by the side sill outer member 21, the center floor main panel 22 and the lower member 23 in the width direction of the vehicle. In other words, in the event of a side collision, the side sill outer member 21, the center floor main panel 22 and the lower member 23 can mainly support the collision load, and the side sill outer bulkhead 24 and the side sill inner bulkhead 25 can additionally support the collision load in the closed cross-sectional space.

[0064] Both end portions of the side sill outer bulkhead 24 may be supported to contact the inner surface of the side sill outer member 21 in the longitudinal direction of the vehicle. The inner surface of the side sill outer bulkhead 24 may contact the side sill inner bulkhead 25 in the width direction.

[0065] The side beam inner bulkhead 25 may be positioned inside the vehicle compared to the side beam outer bulkhead 24, may be in contact with the side beam outer bulkhead 24, and may be supported on the inner surfaces of the center floor main panel 22 and the lower member 23. The side surface (e.g., the outer side in the width direction) of the side beam inner bulkhead 25 may be in contact with the side beam outer bulkhead 24. Both end portions of the side beam inner bulkhead 25 may be supported on the inner surfaces of the center floor main panel 22 and the lower member 23 in the longitudinal direction of the vehicle.

[0066] Therefore, in the event of a side collision, the collision load input to the side sill outer member 21 may be transmitted to the center floor main panel 22 and the lower member 23 through the side sill outer bulkhead 24 and the side sill inner bulkhead 25 .

[0067] At the same time, the side beam outer bulkhead 24 is joined to the side beam inner bulkhead 25 in a stepped manner. In other words, the surface where the side beam outer bulkhead 24 and the side beam inner bulkhead 25 contact each other may be formed to be curved to form a curved portion BP. The curved portion BP is curved toward the outside of the vehicle, and the curved portion BP is located at the upper portion of the surface. According to the above structure, the upper portion of the side beam inner bulkhead 25 may firmly support the upper portion of the side beam outer bulkhead 24. Therefore, at the time of a side collision, the side beam outer bulkhead 24 and the side beam inner bulkhead 25 may prevent the side beam from intruding into the interior of the vehicle.

[0068] Specifically, the seat cross member 31 may be arranged in a portion where the side sill inner bulkhead 25 is installed in the longitudinal direction of the vehicle to allow the seat cross member 31 to support collision load input to the side sill outer bulkhead 24 and the side sill inner bulkhead 25 .

[0069] In addition, the support member 29 may be provided inside the panel joint portion 23c in the lower member 23. The support member 29 may be inserted into the panel joint portion 23c having an open bottom and may prevent the panel joint portion 23c from being deformed in the width direction of the vehicle. The support member 29 may also be provided in a portion where the side beam outer bulkhead 24 and the side beam inner bulkhead 25 are installed.

[0070] Furthermore, a side sill outer reinforcement tube 26 and a side sill inner reinforcement tube 27 may be additionally provided inside the side sill outer bulkhead 24 and the side sill inner bulkhead 25 .

[0071] The side sill outer reinforcement tube 26 may be installed to pass through the side sill outer bulkhead 24 , and the side sill inner reinforcement tube 27 may be installed to pass through the side sill inner bulkhead 25 .

[0072] The side sill outer reinforcement tube 26 and the side sill inner reinforcement tube 27 may be disposed above a portion where a step is formed on a surface where the side sill outer bulkhead 24 and the side sill inner bulkhead 25 contact each other.

[0073] In this case, the front end portion of the side beam outer reinforcement tube 26 can be inserted into the side beam inner reinforcement tube 27 with a predetermined length through the side beam outer bulkhead 24 and the side beam inner bulkhead 25. In one embodiment, an insertion portion 26a may be formed on the side beam outer reinforcement tube 26, and a receiving portion 27a for the insertion portion 26a to be inserted may be formed on the side beam inner reinforcement tube 27, and the insertion portion 26a may be inserted into the receiving portion 27a, so that the side beam outer reinforcement tube 26 is inserted into the side beam inner reinforcement tube 27.

[0074] Since the side sill outer reinforcement tube 26 is partially inserted into the side sill inner reinforcement tube 27 , in the event of a side collision, a portion of the collision load may further insert the side sill outer reinforcement tube 26 into the interior of the side sill inner reinforcement tube 27 , so that the portion of the collision load may be consumed.

[0075] Since members supporting a side collision are concentrated and arranged in a portion where the seat cross member 31 is installed, load input due to a side collision can be supported so that the side member can rotate and deform, and the side member can be prevented from intruding into the interior of the vehicle.

[0076] The side beam outer bulkhead 24 and the side beam inner bulkhead 25 may be arranged inside a portion of a closed cross section formed by the side beam outer member 21, the center floor main panel 22, and the lower member 23 where the seat cross member 31 is mounted, and the side beam outer reinforcement tube 26 and the side beam inner reinforcement tube 27 may be inserted into the side beam outer bulkhead 24 and the side beam inner bulkhead 25, respectively.

[0077] Furthermore, the support piece 29 on the lower member 23 may also be installed at a portion where the seat cross member 31 is installed in the longitudinal direction of the vehicle.

[0078] Figure 6 1 shows a state where an obstacle "B" collides with a side surface of a vehicle in a hypothetical side collision situation. When the obstacle B first hits the side sill outer panel 11, the collision load may be transmitted to the side sill outer member 21. The collision load may be transmitted by, for example, Figure 6 The path of the arrow shown by the dotted line is transmitted to the interior of the vehicle.

[0079] In this case, the collision load can be transmitted from the side sill outer panel 11 to the vehicle interior through the side sill outer member 21. Since the side sill outer bulkhead 24 and the side sill inner bulkhead 25 support the collision load in the closed cross-sectional space formed by the side sill outer member 21, the center floor main panel 22 and the lower member 23 in the width direction of the vehicle, the side sill outer member 21 can be prevented from rotational deformation in the arrow direction toward the vehicle interior. In addition, since the side sill outer bulkhead 24 and the side sill inner bulkhead 25 are formed in a stepped shape, and the side sill outer reinforcement pipe 26 and the side sill inner reinforcement pipe 27 are inserted above the side sill outer bulkhead 24 and the side sill inner bulkhead 25, the rotational deformation of the side sill outer member 21 can be prevented while supporting the collision load.

[0080] Thereafter, the collision load can be supported by the support member 29 and can also be supported by the seat cross member 31. The seat cross member 31 can be arranged in the width direction of the vehicle in alignment with the side sill outer bulkhead 24, the side sill inner bulkhead 25, the side sill outer reinforcement tube 26, the side sill inner reinforcement tube 27, and the support member 29. Therefore, the collision load input during the side collision can be supported, and thus the phenomenon that the side sill outer member 21 is rotationally deformed to intrude into the passenger compartment can be prevented, so that the injury to the passenger can be reduced.

[0081] Figure 7 A process of assembling a lower side structure of a vehicle according to the present disclosure is shown.

[0082] First, the side assembly I and the floor assembly II may be assembled separately.

[0083] The side assembly I is in a state where the side beam outer panel 11 , the center pillar outer component 12 , the center pillar inner component 13 , the center pillar outer component 14 , the top side rail 15 , the side beam outer component 21 , the side beam outer bulkhead 24 and the side beam outer reinforcement tube 26 can be assembled.

[0084] The floor assembly II is in a state where the center floor main panel 22 , the lower member 23 , the seat cross member 31 , the first sub-member 32 , the second sub-member 33 , the side sill inner bulkhead 25 and the side sill inner reinforcement tube 27 can be assembled.

[0085] The side assembly I and the floor assembly II may be arranged at the correct positions.

[0086] When the side assembly I and the floor assembly II are arranged at the correct position, the upper end portion 21a of the side sill outer member 21 and the upper joint portion 22a of the center floor main panel 22 can be assembled using welding, and at the same time, the lower end portion 21b of the side sill outer member 21 and the lower joint portion 23a of the lower member 23 of the center floor main panel 22 can be assembled to form a Figure 1 The structure shown.

[0087] According to the vehicle lower side structure according to the present disclosure having the above-described configuration, since the side sill inner member and the center floor panel are integrally formed, the structure can be simplified and foreign matter such as moisture can be prevented from being introduced between the side sill inner member and the center floor panel.

[0088] Furthermore, since the side sill outer bulkhead and the side sill inner bulkhead are installed to be in contact with each other, a collision load input during a side collision can be supported.

[0089] In addition, when the side sill outer reinforcement pipe and the side sill inner reinforcement pipe can be assembled into each other, the collision load can be exhausted. Therefore, it is possible to prevent the collision load from deforming the side sill to intrude into the interior of the passenger compartment.

[0090] Because the side beam does not intrude into the passenger compartment during a side collision, injuries to the occupants can be reduced and damage to the battery can be prevented.

[0091] Although the embodiments of the present disclosure have been described, it should be understood by those skilled in the art that the present disclosure can be implemented in other specific forms without departing from the technical spirit or essential features of the present disclosure. Therefore, it should be understood that the above embodiments are not restrictive in all aspects, but illustrative.

Claims

1. A lower side structure of a vehicle, the lower side structure comprising: a side sill outer member having a convex cross-sectional shape that is convexly curved toward the exterior of the vehicle; as well as A center floor main panel includes side ends and is configured to form a floor of a vehicle, wherein the side ends of the center floor main panel are joined to upper ends of the side sill outer members.

2. The lower side structure according to claim 1, further comprising: a lower member including an end portion, the end portion of the lower member being joined to the lower end portion of the side sill outer member and assembled to the lower portion of the center floor main panel, Wherein, the side sill outer member, the center floor main panel and the lower member are configured to form a closed cross section.

3. The lower side structure according to claim 2, further comprising between the side sill outer member, the center floor main panel and the lower member: a side sill outer bulkhead supported on an inner surface of the side sill outer member; and A side sill inner bulkhead is positioned inside the vehicle compared to the side sill outer bulkhead and is in contact with the side sill outer bulkhead, wherein the side sill inner bulkhead is supported on an inner surface of the center floor main panel and an inner surface of the lower member.

4. The lower side structure according to claim 3, wherein: Surfaces of the side sill outer bulkhead and the side sill inner bulkhead that contact each other are formed to have a step portion.

5. The lower side structure according to claim 4, wherein: Surfaces of the side sill outer bulkhead and the side sill inner bulkhead in contact with each other are bent toward the outside of the vehicle at upper portions of the surfaces.

6. The lower side structure according to claim 3, further comprising: a side beam outer reinforcement tube installed to pass through the side beam outer bulkhead; as well as The side sill inner reinforcement tube is installed to pass through the side sill inner bulkhead and to be inserted from the end of the side sill outer reinforcement tube with a predetermined length.

7. The lower side structure according to claim 6, wherein: The side sill outer reinforcement tube and the side sill inner reinforcement tube are arranged above a step portion of a surface where the side sill outer bulkhead and the side sill inner bulkhead contact each other.

8. The lower side structure according to claim 3, wherein: A seat cross member arranged in the width direction of the vehicle is assembled on the upper surface of the center floor main panel; and The seat cross member is arranged in a portion where the side sill inner bulkhead is installed in a longitudinal direction of the vehicle.

9. The lower side structure according to claim 1, wherein: The central floor main panel comprises: an upper connecting portion connected to an upper end portion of the side beam outer member; an upper reinforcement portion formed from the upper joining portion to be spaced apart from the side sill outer member; and The center floor panel portion extends from the upper reinforcement portion toward the interior of the vehicle.

10. The lower side structure according to claim 9, wherein: The upper reinforcement portion comprises: a horizontal portion extending from a lower end portion of the upper joint portion in a horizontal direction to be spaced apart from the side beam outer member; and The vertical portion extends downward from the horizontal portion.

11. The lower side structure according to claim 2, wherein: The lower member comprises: a lower joint portion joined to a lower end portion of the side beam outer member; a lower reinforcement portion connected to the lower joining portion and forming a closed cross section with the side sill outer member; a panel joint portion joined to the bottom surface of the central floor main panel; and A battery mounting portion on which a battery is mounted.

12. The lower side structure according to claim 11, wherein: The lower reinforcement portion comprises: a horizontal portion extending from an upper end portion of the lower joining portion in a horizontal direction to be spaced apart from the side beam outer member; and A vertical portion is formed to extend upward from the horizontal portion.

13. The lower side structure according to claim 11, wherein: The panel combining portion is formed to have an open bottom; and The battery mounting portion is formed to have an open top.

14. The lower side structure according to claim 11, wherein: A support member is arranged inside the panel combining portion.

15. The lower side structure according to claim 14, wherein: The support member is arranged in a portion where a side sill outer bulkhead supported on an inner surface of the side sill outer member and a side sill inner bulkhead supported on an inner surface of the center floor main panel and an inner surface of the lower member are installed.

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