Connection structure for vehicle body

Abstract

A connection structure of a vehicle body may include: a lower vehicle body to which a lower vehicle body mounting unit is mounted; and a variable portion including a variable portion mounting unit selectively connected to the lower vehicle body mounting unit, and an outer cross member mounted at an upper portion of the variable portion mounting unit.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0125387 filed in the Korean Intellectual Property Office on September 20, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The invention relates to a connecting structure of a vehicle body. Background Art

[0004] Recently, the automotive industry is introducing a new concept for realizing the vision of future mobility that is people-centric and vibrant future cities. One of these future mobility solutions is purpose-built vehicles (PBVs), which are a form of purpose-based mobility.

[0005] An example of a PBV may be an environmentally friendly mobile vehicle based on an electric vehicle (EV). Such a PBV may provide users with various customized services while moving from a departure point to a destination in an unmanned autonomous driving manner.

[0006] The body of such a PBV is composed of an underbody (also referred to in the art as a rolling chassis or a skateboard) and an upper body assembled to the underbody.

[0007] Here, the upper body may be constructed in various forms according to the type of customized service of the PBV. For example, the PBV may be used as a hailing type vehicle in which a passenger compartment is respectively arranged at the front and rear of the upper body. In addition, the PBV may be used as a cab type vehicle in which a passenger compartment is arranged only at the front of the upper body. In addition, the PBV may be used as a delivery type vehicle in which a passenger compartment is arranged at the front of the upper body and a luggage compartment is arranged at the rear.

[0008] PBVs can be used only as ride-hailing or delivery vehicles, but if users can use them while changing their purpose, the usage time of the vehicle can be significantly increased.

[0009] In other words, if the purpose of the vehicle can be easily changed, and the passenger compartment of the upper body including the front part of the vehicle including the driver's seat and the lower body have a common structure, and the rear part of the upper body is configured to be easily replaced, the cost can be reduced while improving the utilization rate of the vehicle.

[0010] The matters described in this background section are prepared for enhancement of understanding of the background of the invention and may include matters beyond the prior art that is known, available or in use. Summary of the invention

[0011] The present invention relates to a vehicle body, and more particularly to a connection structure of a vehicle body.

[0012] Embodiments of the present invention may provide a connection structure of a vehicle body that may be easily changed to various types of vehicle bodies to improve the utilization rate of a PBV.

[0013] A connection structure of a vehicle body according to an exemplary embodiment may include a lower vehicle body mounted with a lower vehicle body mounting unit, and a variable portion including a variable portion mounting unit selectively connected to the lower vehicle body mounting unit, and an outer cross member mounted at an upper portion of the variable portion mounting unit.

[0014] An underbody insertion hole may be formed at an upper portion of the underbody, and the underbody mounting unit may be inserted into the underbody insertion hole.

[0015] The underbody mounting unit and the underbody may be bolted together in a height direction of the vehicle body and in a length direction of the vehicle body.

[0016] The underbody connection recess may be formed at least one side of the underbody, and the underbody connection recess may support the underbody mounting unit.

[0017] The variable portion may include a rear floor, the variable portion mounting unit may be connected to the rear floor, and the outer cross member may be connected to an upper portion of the rear floor.

[0018] The outer cross beam and the rear floor can form a cross beam enclosed space along the length direction of the vehicle body.

[0019] The connection structure according to the exemplary embodiment may further include a connection support installed between the rear floor and the outer cross member.

[0020] A connection support hole may be formed in the connection support, and the variable portion mounting unit may be engaged with the connection support hole by a variable portion mounting bolt.

[0021] The connection structure according to the exemplary embodiment may further include a spacer disposed between the connection support and the rear floor into which the variable portion mounting bolt is inserted.

[0022] The connection structure according to the exemplary embodiment may further include a plurality of floor cross members connected to a lower portion of the rear floor in a width direction of the vehicle body and arranged at intervals in a length direction of the vehicle body.

[0023] The plurality of floor cross members may include a central cross member, a front cross member disposed in front of the central cross member, and a rear cross member disposed behind the central cross member.

[0024] The connection structure according to the exemplary embodiment may further include a plurality of seat cross members connected to an upper portion of the rear floor in a length direction of the vehicle body and arranged at intervals in a width direction of the vehicle body.

[0025] The plurality of seat cross beams may include outer cross beams disposed on both sides in the width direction of the vehicle body, and inner cross beams disposed between the outer cross beams.

[0026] The plurality of seat cross members may overlap at least two of the plurality of floor cross members in an up-and-down direction.

[0027] The connection structure according to the exemplary embodiment may further include a seat frame connected to an upper portion of the seat cross beam to support the seat.

[0028] According to the exemplary embodiment, it is possible to provide a strong mounting structure connecting the lower vehicle body and the mounting unit of the variable portion.

[0029] According to an exemplary embodiment of the present invention, the variable portion may be easily changed to various types of vehicle bodies to improve the utilization rate of the PBV.

[0030] According to the connection structure of the vehicle body according to the exemplary embodiment, the collision load during the vehicle collision is easily dispersed through various configurations of the load path for fixing the seat and the lower vehicle body.

[0031] In addition, the advantages that can be obtained or expected by the embodiments of the present invention can be directly or implicitly disclosed in the specific embodiments of the present invention. In other words, various advantages predicted according to the present invention can be disclosed in the specific embodiments described later. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Since these drawings are intended to be used for reference in explaining exemplary embodiments of the present invention, the technical idea of ​​the present invention is not necessarily limited to the drawings.

[0033] Figure 1 is an exploded perspective view illustrating a connection structure of a vehicle body according to an exemplary embodiment of the present invention.

[0034] Figure 2 is a partial perspective view of a connecting structure of a vehicle body according to an exemplary embodiment of the present invention.

[0035] Figure 3 It is shown Figure 2 An enlarged view of a portion of the .

[0036] Figure 4 is an exploded perspective view of a lower vehicle body mounting unit and a lower vehicle body of a connecting structure of a vehicle body according to an exemplary embodiment of the present invention.

[0037] Figure 5 is a perspective view of a lower vehicle body mounting unit and a lower vehicle body of a connecting structure of a vehicle body according to an exemplary embodiment of the present invention.

[0038] Figure 6 is an exploded perspective view of a variable portion mounting unit and an outer cross member of a connection structure of a vehicle body according to an exemplary embodiment of the present invention.

[0039] Figure 7 is along Figure 3Sectional view along line AA.

[0040] Figure 8 is along Figure 3 Cross-sectional view along line BB in FIG.

[0041] Fig. 9 is along Figure 3 Cross-sectional view along line CC in FIG.

[0042] Fig.10 is a top view of a connection structure of a vehicle body according to an exemplary embodiment of the present invention.

[0043] Fig.11 is a diagram illustrating a load path of a connection structure of a vehicle body according to an exemplary embodiment of the present invention.

[0044] Fig.12 is a top view of a connecting structure of a vehicle body according to an exemplary modified embodiment of the present invention.

[0045] The accompanying drawings referred to above are not necessarily drawn to scale, but can be understood as presenting a slightly simplified representation of various features that illustrate the principles and exemplary embodiments of the present invention. The specific design features of the embodiments of the present invention, including, for example, specific size, orientation, position and shape, may be determined in part by the specific intended use and use environment. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As will be appreciated by those skilled in the art, the exemplary embodiments described can be modified in various ways without departing from the idea or scope of the present invention.

[0047] The terms used herein may be used to describe particular embodiments and are not necessarily intended to limit the present disclosure.As used herein, the singular form may be intended to include the plural form as well, unless the context clearly indicates otherwise.

[0048] As used herein, the terms “include” and / or “comprises” indicate the presence of specified features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components and / or combinations thereof.

[0049] As used in this specification, the term “and / or” may include any one or all combinations of at least one of the associated listed items.

[0050] In this specification, the terms "connected" or "coupled" may refer to a physical relationship between two parts, for example, a physical relationship in which the parts are directly connected to each other by welding, self-piercing rivets (SPR), flow drill screws (FDS), structural adhesives, etc., or may refer to an indirect connection through one or more intermediate parts.

[0051] As used herein, "vehicle," "vehicle," "automobile" or other similar terms as used herein may generally refer to, for example, passenger cars, sports cars, sport utility vehicles (SUVs), buses, trucks and various commercial vehicles including passenger cars, hybrid vehicles, electric vehicles, hybrid electric vehicles, PBVs (purpose built vehicles) based on electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum).

[0052] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0053] Figure 1 is an exploded perspective view illustrating a connection structure of a vehicle body according to an exemplary embodiment. Figure 2 is a partial perspective view of a connection structure of a vehicle body according to an exemplary embodiment.

[0054] Reference Figure 1 and Figure 2 According to the exemplary embodiment, the vehicle body 10 to which the following connection structure of the vehicle body is applicable may be, for example, a purpose-based motor vehicle (Purpose Built Vehicle: hereinafter referred to as “PBV”).

[0055] PBV can be used as a living module vehicle based on an electric vehicle, providing users with various customized services during the travel from the departure point to the destination.

[0056] In one example, the PBV can be manufactured as a single-box design with a large interior space. In addition, the PBV can also apply face-to-face seats to the interior space.

[0057] The body of such a PBV can be adapted for small-batch production of various vehicle types with a small number of parts and can be manufactured in a variety of shapes and sizes.

[0058] The body of the PBV may include a skateboard-type lower body 20 (commonly referred to as a “rolling chassis” or a “chassis frame” by those skilled in the art) and an upper body assembled to the lower body 20 .

[0059] The lower vehicle body 20 may be equipped with components such as a battery assembly and a drive motor. In addition, the upper vehicle body may be a BIW (Body in White) combined with the lower vehicle body 20, and may include a passenger room and a luggage room having a large interior space.

[0060] In this specification, “the front-rear direction of the vehicle body” may be the longitudinal direction of the vehicle body, “the vehicle width direction” may be the left-right direction of the vehicle body, and “the up-down direction” may be the height direction of the vehicle body.

[0061] In the present specification, the “upper end”, “upper part” or “upper surface” of a component may refer to the end, part or surface of the component relatively higher in the figure, and the “lower end”, “lower part” or “lower surface” of a component may refer to the end, part or surface of the component relatively lower in the figure.

[0062] In addition, in the present specification, an end of a component (e.g., one end or the other end, etc.) may refer to the end of the component in any direction, and an end portion of a component (e.g., one end portion or the other end portion, etc.) may refer to the portion of the component including the end.

[0063] According to an exemplary embodiment, the connection structure of the vehicle body may be a structure in which upper vehicle bodies of various shapes and purposes may be applied to the lower vehicle body 20 according to the type of customized service of the PBV.

[0064] To this end, the connection structure of the vehicle body according to the exemplary embodiment may include a front vehicle body module (not shown) and a rear vehicle body module 40 as an upper vehicle body.

[0065] A front mounting unit 42 may be mounted in front of the rear body module 40 for connection with a front body module (not shown). For example, the front body module may be a fixing portion fixed to the lower body 20. The fixing portion may be a component coupled to the lower body 20, and may be a component that is not replaced even if the purpose of use of the vehicle changes.

[0066] The rear vehicle body module 40 may be a component that is replaceable according to the purpose of use of the vehicle, and may be a variable portion 40 (replaceable portion).

[0067] Each "installation unit" may be a structure for combining the front body module and / or the rear body module of the upper body with the lower body. For example, the "installation unit" may be a mechanical structure that can be combined manually, assembled by operation of a separate actuator including a magnetic component, and can be combined and / or released according to the supply of an external or internal power source, etc. A detailed description of the structure and operation of the "installation unit" that can connect or disconnect one or more modules or frames may be omitted.

[0068] An underbody mounting unit 30 may be mounted on the underbody 20 .

[0069] A variable portion mounting unit 50 that is selectively connectable to the lower vehicle body mounting unit 30 may be mounted on the variable portion 40 .

[0070] Figure 3 It is shown Figure 2 An enlarged view of a portion of the . Figure 4 is an exploded perspective view of a lower vehicle body mounting unit and a lower vehicle body of a connection structure of a vehicle body according to an exemplary embodiment. Figure 5 is a perspective view of a lower vehicle body mounting unit and a lower vehicle body of a connection structure of a vehicle body according to an exemplary embodiment.

[0071] Reference Figures 1 to 5 A lower body insertion hole 22 may be formed at an upper portion of the lower body 20 , and the lower body mounting unit 30 may be inserted into the lower body insertion hole 22 .

[0072] The under-body mounting unit 30 may be inserted into the under-body insertion hole 22 to minimize exposure or protrusion of the under-body mounting unit 30 .

[0073] The lower vehicle body mounting unit 30 and the lower vehicle body 20 may be connected by bolts.

[0074] For example, at the upper portion of the lower body 20, a lower body connection hole 24 may be formed around the lower body insertion hole 22. And the lower body mounting bolt 32 may be engaged in the lower body connection hole 24, so that the lower body mounting unit 30 may be mounted on the lower body 20.

[0075] In addition, the lower body side connection bolts 28 may be engaged at the side of the lower body 20 to fix the lower body mounting unit 30 to the lower body 20. The lower body connection recess 26 may be formed at the side of the lower body 20 to prevent the lower body side connection bolts 28 from protruding, support the lower body mounting unit 30, and increase the strength of the lower body 20.

[0076] Figure 6 is an exploded perspective view of a variable portion mounting unit and an outer cross member of a connection structure of a vehicle body according to an exemplary embodiment. Figure 7 is along Figure 3 Sectional view along line AA.

[0077] Lower body lower connecting bolt 29 (refer to Figure 7 ) can connect the lower part of the lower body 20 and the lower body mounting unit 30. Therefore, the lower body 20 and the lower body mounting unit 30 can be connected in various directions, making the connection more secure and also compensating for the weakening of strength caused by the lower body insertion hole 22.

[0078] Figure 8 is along Figure 3 Cross-sectional view along line BB in FIG. Fig. 9 is along Figure 3 Cross-sectional view along line CC in FIG.

[0079] Reference Figures 1 to 9According to an exemplary embodiment, the connection structure of the vehicle body may include a lower vehicle body 20 to which a lower vehicle body mounting unit 30 may be mounted and a variable portion 40. Also, the variable portion 40 may include a variable portion mounting unit 50 installed to be selectively connected to the lower vehicle body mounting unit 30, and an outer cross member 72 mounted on an upper portion of the variable portion mounting unit 50.

[0080] The outer beam 72 may be disposed at an upper portion of the variable portion mounting unit 50 to disperse a load transferred from or to the variable portion mounting unit 50 and to support the variable portion mounting unit 50 .

[0081] The variable portion 40 may include a rear floor 60, and the variable portion mounting unit 50 may be connected to the rear floor 60. For example, the connection may be made by welding. In addition, the outer cross member 72 may be connected to the upper portion of the rear floor 60 and may support the rear floor 60 connected to the variable portion mounting unit 50.

[0082] The outer cross member 72 and the rear floor 60 may form a cross member closed space 76 along the length direction of the vehicle body. Due to the connection shape of the outer cross member 72 and the rear floor 60, the section modulus may be increased, and the strength of the lower portion of the vehicle body 10 may be increased.

[0083] According to an exemplary embodiment, the connection structure of the vehicle body may further include a connection support 80 installed between the rear floor 60 and the outer cross member 72 .

[0084] A connection support hole 82 may be formed in the connection support 80 , and the variable portion mounting unit 50 may be engaged with the connection support hole 82 by the variable portion mounting bolt 52 .

[0085] The variable part mounting unit 50 may be doubly connected to the rear floor 60 and the connection support 80 by the variable part mounting bolts 52 to further ensure the connection strength of the variable part mounting unit 50. Therefore, the rigid mounting of the variable part mounting unit 50 and the strength around the mounting position of the variable part mounting unit 50 can be increased.

[0086] According to an exemplary embodiment, the connection structure of the vehicle body may further include a spacer 84 disposed between the connection support 80 and the rear floor 60 and into which the variable portion mounting bolt 52 is inserted. The spacer 84 may space the rear floor 60 from the connection support 80 by a certain distance and support the variable portion mounting bolt 52 so as to enable a secure connection of the variable portion mounting unit 50.

[0087] Fig.10 is a top view of a connection structure of a vehicle body according to an exemplary embodiment.

[0088] Reference Figures 1 to 10According to an exemplary embodiment, the connection structure of the vehicle body may further include a plurality of floor cross members 90 connected to the lower portion of the rear floor 60 in the width direction of the vehicle body 10 and arranged at intervals along the length direction of the vehicle body 10 .

[0089] The plurality of floor cross members 90 may include a central cross member 92 , a front cross member 91 disposed in front of the central cross member 92 , and a rear cross member 93 disposed behind the central cross member 92 .

[0090] A plurality of floor cross members 90 may be connected to the rear floor 60 in the width direction of the vehicle body 10 , for example, by welding, to increase the width direction strength of the vehicle body 10 .

[0091] The front cross member 91 and the center cross member 92 may be disposed in front of and behind the mounting positions of the lower vehicle body mounting unit 30 and the variable portion mounting unit 50 to transfer loads of the lower vehicle body mounting unit 30 and the variable portion mounting unit 50 .

[0092] According to an exemplary embodiment, the connection structure of the vehicle body may further include a plurality of seat cross members 70 connected to an upper portion of the rear floor 60 in the length direction of the vehicle body 10 and arranged at intervals in the width direction of the vehicle body 10 .

[0093] The plurality of seat cross beams 70 may include outer cross beams 72 disposed on both sides of the vehicle body 10 in the width direction and inner cross beams 74 disposed between the outer cross beams 72. The outer cross beams 72 may be disposed above the variable portion mounting unit 50 to disperse the transmission load of the outer cross beams 72.

[0094] In the drawings, two inner cross beams 74 are shown, but the embodiment is not necessarily limited thereto and may be installed in various shapes and numbers according to the number and configuration of seats installed on the variable portion 40 .

[0095] The plurality of seat cross members 70 may overlap at least two of the plurality of floor cross members 90 in the up-down direction.

[0096] exist Fig.10 , the center cross member 92 , the rear cross member 93 , and the seat cross member 70 are shown as overlapping, but are not necessarily limited thereto, and the seat cross member 70 may overlap with the front cross member 91 .

[0097] A plurality of seat cross beams 70 and a plurality of floor cross beams 90 may overlap to ensure smooth load transfer and a strong connection between the seat cross beams 70 and the floor cross beams 90 .

[0098] Fig.11 is a diagram illustrating a load path of a connection structure of a vehicle body according to an exemplary embodiment.

[0099] Reference Fig.11A seat frame 110 supporting the seat 100 may be connected to an upper portion of the seat cross member 70 . The seat frame 110 may be connected to the seat cross member 70 to distribute the load of the seat 100 to the vehicle body 10 and to distribute the load transmitted from the variable portion mounting unit 50 .

[0100] According to an exemplary embodiment, the connection structure of the vehicle body may form a lower vehicle body longitudinal direction load path LP1 in the length direction of the vehicle body 10 along the lower vehicle body 20, a lower vehicle body height direction load path LP2 in the up-down direction of the lower vehicle body mounting unit 30 and the variable portion mounting unit 50, a floor cross member load path LP3 along the floor cross member 90 in the width direction of the vehicle body 10, a seat cross member load path LP4 along the seat cross member 70 in the longitudinal direction of the vehicle body 10, and a seat frame height direction load path LP5 and a seat frame lateral direction load path LP6 along the seat frame 110. Various load paths may be formed so that the load may be smoothly dispersed and the vehicle body strength may be ensured.

[0101] Fig.12 is a top view of a connecting structure of a vehicle body according to an exemplary modified embodiment of the present invention.

[0102] If the widthwise length of the underbody 20 does not match the length of the seat, a portion of the shape of the outer cross member 174 may be bent in the widthwise direction of the vehicle body 10 to maintain the up-and-down overlap with the variable portion mounting unit 50 .

[0103] This figure shows that a portion of the shape of the outer cross member 174 may be bent inwardly in the width direction of the vehicle body 10 , but the embodiment is not necessarily limited thereto, and a shape bent outwardly is also possible.

[0104] As described above, according to the connection structure of the vehicle body according to the exemplary embodiment, by reinforcing the configuration of selectively connecting the variable portion and the lower vehicle body, it is possible to appropriately disperse the load.

[0105] Although the exemplary embodiments of the present invention have been described in conjunction with what are presently considered to be practical exemplary embodiments, it is to be understood that the invention is not necessarily limited to the disclosed embodiments, but rather is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A vehicle body connection structure, comprising: a lower body, on which a lower body mounting unit is mounted; as well as The variable portion includes a variable portion mounting unit selectively connected to the lower vehicle body mounting unit, and an outer cross member mounted on an upper portion of the variable portion mounting unit.

2. The connection structure according to claim 1, wherein: An underbody insertion hole is located at an upper portion of the underbody, and the underbody mounting unit is inserted into the underbody insertion hole.

3. The connection structure according to claim 2, wherein: The lower vehicle body mounting unit and the lower vehicle body are bolted together in a height direction of the vehicle body and a length direction of the vehicle body.

4. The connection structure according to claim 3, wherein: An underbody connection recess is located at least one side of the underbody, and the underbody connection recess supports the underbody mounting unit.

5. The connection structure according to claim 1, wherein: The variable portion includes a rear floor, the variable portion mounting unit is coupled to the rear floor, and the outer cross member is coupled to an upper portion of the rear floor.

6. The connection structure according to claim 5, wherein: The outer cross beam and the rear floor form a cross beam closed space along the length direction of the vehicle body.

7. The connection structure according to claim 5, further comprising a connection support installed between the rear floor and the outer cross beam.

8. The connection structure according to claim 7, wherein: A connection support hole is located in the connection support, and the variable portion mounting unit is engaged with the connection support hole by a variable portion mounting bolt. 9 . The connection structure according to claim 8 , further comprising a spacer disposed between the connection support and the rear floor and into which the variable portion mounting bolt is inserted.

10. The connection structure according to claim 5, further comprising a plurality of floor cross members connected to a lower portion of the rear floor in a width direction of the vehicle body and arranged at intervals in a length direction of the vehicle body.

11. The connection structure according to claim 10, wherein: The plurality of floor beams include: central beam; a front crossbeam, disposed in front of the central crossbeam; and The rear cross beam is arranged behind the central cross beam. 12 . The connection structure according to claim 11 , further comprising a plurality of seat cross members connected to an upper portion of the rear floor in a length direction of the vehicle body and arranged at intervals in a width direction of the vehicle body.

13. The connection structure according to claim 12, wherein: The plurality of seat cross beams include: The outer cross beams are arranged on both sides of the vehicle body in the width direction; and The inner cross beam is arranged between the outer cross beams.

14. The connection structure according to claim 12, wherein: The plurality of seat cross members overlap at least two of the plurality of floor cross members in a vertical direction.

15. The connection structure according to claim 12, further comprising a seat frame connected to an upper portion of the seat cross beam to support a seat.

16. A vehicle body, comprising: Lower body; variable part; as well as Means for selectively connecting the variable portion to the underbody.

17. The vehicle body according to claim 16, wherein: The underbody includes means for increasing the strength of the body.

18. The vehicle body according to claim 16, wherein: The variable portion includes means for increasing the strength of the vehicle body.

19. A vehicle body, comprising: A lower body, on which a lower body mounting unit is mounted, wherein a lower body insertion hole is located at an upper portion of the lower body, the lower body mounting unit is inserted into the lower body insertion hole, the lower body mounting unit and the lower body are bolted together in a height direction of the body and a length direction of the body, a lower body connection recess is located at at least one side of the lower body, and the lower body connection recess supports the lower body mounting unit; a variable portion, comprising a variable portion mounting unit selectively connected to the lower vehicle body mounting unit and an outer cross beam mounted on an upper portion of the variable portion mounting unit, wherein the variable portion comprises a rear floor, the variable portion mounting unit is coupled to the rear floor, and the outer cross beam is coupled to an upper portion of the rear floor, the outer cross beam and the rear floor forming a cross beam closed space along a length direction of the vehicle body; a connecting support member installed between the rear floor and the outer cross member, wherein a connecting support hole is located in the connecting support member and the variable portion mounting unit is engaged with the connecting support hole by a variable portion mounting bolt; and A spacer is disposed between the connection support member and the rear floor, and the variable portion mounting bolt is inserted into the spacer.

20. The vehicle body of claim 19, further comprising: A plurality of floor cross members connected to the lower portion of the rear floor in the width direction of the vehicle body and arranged at intervals along the length direction of the vehicle body, wherein the plurality of floor cross members include: Central beam, a front crossbeam, arranged in front of the central crossbeam, and a rear crossbeam, arranged behind the central crossbeam; A plurality of seat cross beams connected to the upper portion of the rear floor in the length direction of the vehicle body and arranged at intervals in the width direction of the vehicle body, wherein the plurality of seat cross beams include: The outer cross beam is arranged on both sides of the width direction of the vehicle body, and an inner cross beam disposed between the outer cross beams, wherein the plurality of seat cross beams overlap at least two of the plurality of floor cross beams in an up-down direction; and a seat frame connected to an upper portion of the seat cross beams to support a seat.

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