Underbody for a vehicle

Abstract

The present invention relates to a vehicle body bottom for a vehicle, which can arrange and join a plurality of components forming a vehicle body bottom in a vertical layering structure. The vehicle body bottom includes a panel assembly configured to form a floor of an interior of the vehicle, an upper member assembly configured to be layered on an upper side of the panel assembly and joined to the upper side of the panel assembly, and a lower member assembly configured to be layered on a lower side of the panel assembly and joined to the lower side of the panel assembly, and the lower member assembly is joined to a side portion of the panel assembly and a side portion of the upper member assembly.

Description

Technical Field

[0001] The present invention relates to a vehicle body bottom, and more specifically, to a vehicle bottom having multiple components arranged and joined in a vertically stacked structure. Background Technology

[0002] Typically, the bottom of a vehicle body is configured to support the front and rear seats and separate the interior from the exterior.

[0003] The traditional vehicle body bottom consists of a front floor unit configured to support the front seats, a rear floor unit configured to support the rear seats, a front bulkhead unit located in front of the front floor unit to separate the interior and exterior of the vehicle, a rear component unit located behind the rear floor unit, and a front longitudinal beam unit located in front of the front bulkhead unit.

[0004] This traditional vehicle body bottom is fully assembled by arranging and joining individual units in the front-to-back direction. For this purpose, the individual units are typically supplied to the assembly company by different manufacturers, who then completes the vehicle body bottom by joining the units together.

[0005] However, in the traditional vehicle body bottom, due to the arrangement and connection of various units in the front-rear direction, the problem of separation and disconnection of the connecting parts of the units inevitably occurs.

[0006] Therefore, if the units arranged in the front-rear direction are separated, the conventional bottom of the vehicle body needs to rejoin the separated units by welding or bolting, thereby reducing the quality and performance due to the manufacturing tolerances of the rejoined units.

[0007] The information disclosed in the background section is intended only to enhance the understanding of the background technology of this application, and therefore the information it may include does not constitute prior art that is already known to those skilled in the art in this country. Summary of the Invention

[0008] The present invention provides a vehicle body bottom comprising a plurality of components arranged and joined in a vertically stacked structure, thereby solving conventional problems and thus improving quality and performance.

[0009] Therefore, the present invention provides a vehicle body bottom, comprising: a panel assembly, an upper component assembly, and a lower component assembly, the panel assembly being configured to form a floor inside the vehicle; the upper component assembly being configured to be stacked on top of the panel assembly and joined to the upper side of the panel assembly; the lower component assembly being configured to be stacked on the bottom of the panel assembly and joined to the bottom side of the panel assembly, and the lower component assembly being joined to a side portion of the panel assembly and a side portion of the upper component assembly.

[0010] The panel assembly includes a front bulkhead, a central floor, and a rear floor. The front bulkhead is configured to separate the vehicle interior from the vehicle exterior. The central floor is fixed to the lower end of the front bulkhead and extends rearward from the lower end of the front bulkhead to form the front portion of the vehicle interior floor. The rear floor is fixed to the rear end of the central floor and extends rearward from the rear end of the central floor to form the rear portion of the vehicle interior floor.

[0011] Furthermore, the panel assembly includes a vertical panel, the upper end of which is fixed to the front end of the rear floor, and the lower end of which is fixed to the rear end of the central floor, so as to connect the central floor to the rear floor.

[0012] Furthermore, the central floor has a central channel portion that is raised upwards in its central part.

[0013] Furthermore, the rear floor has a recessed luggage compartment panel component at its rear portion.

[0014] Further, the lower component assembly includes: a pair of lower side beams, a pair of front longitudinal beams, a pair of rear longitudinal beams, a front transverse member, and a rear transverse member. The pair of lower side beams are respectively fixed to the left and right ends of the central floor. The rear portions of the pair of front longitudinal beams are fixed to the front ends of each lower side beam and the lower portion of the front surface of the front bulkhead, and the front portions of the pair of front longitudinal beams extend to the front of the front bulkhead. The pair of rear longitudinal beams are fixed to the rear portions of each lower side beam to extend to the rear end of the rear floor and are fixed to each of the left and right portions of the rear floor. The front transverse member connects to the front ends of the pair of rear longitudinal beams and is fixed to the vertical plate. The rear transverse member is disposed at the rear of the front transverse member, connects to the central portions of the pair of rear longitudinal beams, and is fixed to the lower surface of the rear floor.

[0015] Furthermore, the lower component assembly includes: a luggage space reinforcement member and a connecting member. The luggage space reinforcement member is disposed at the rear of the rear transverse member, connects the rear portions of a pair of rear longitudinal beams, and is fixed to the luggage space panel component. The connecting member connects the luggage space reinforcement member to the rear transverse member and fixes it to the lower surface of the rear floor.

[0016] Furthermore, the lower component assembly includes: a pair of channel-side reinforcements and at least one bracket, the front end of each of the pair of channel-side reinforcements being fixed to the rear portion of the corresponding front longitudinal beam, the rear end of each of the pair of channel-side reinforcements being fixed to each of the left and right portions of the front transverse member, and the pair of channel-side reinforcements being fixed to the lower surface of the central floor; at least one bracket connects the pair of channel-side reinforcements and is fixed to the lower surface of the central channel portion.

[0017] Meanwhile, the upper component assembly includes: a front bulkhead reinforcement, a channel reinforcement, a lower front bulkhead component, and a plurality of seat transverse components. The front bulkhead reinforcement is fixed to the upper portion of the rear surface of the front bulkhead to reinforce the front bulkhead; the channel reinforcement is fixed to the upper portion of the central channel portion to reinforce the central channel portion; the lower front bulkhead component is fixed to the lower end of the front bulkhead reinforcement and the front end of the channel reinforcement to connect the front bulkhead reinforcement to the channel reinforcement, and the lower front bulkhead component is fixed to the lower portion of the rear surface of the front bulkhead; the first ends of the plurality of seat transverse components are fixed to the side surface of the channel reinforcement, and the second ends of the plurality of seat transverse components are fixed to the upper portion of the lower side beam.

[0018] Furthermore, the upper component assembly includes a pair of front side reinforcements, which are fixed to each of the left and right ends of the lower front bulkhead component and to the lower portion of the rear surface of the front bulkhead.

[0019] Furthermore, the rear end of the channel reinforcement is engaged and secured to the vertical plate.

[0020] Furthermore, the first end of the seat transverse member is fixed to the side surface of the channel reinforcement and to the side surface of the central channel portion, and the central portion between the first end and the second end of the seat transverse member is fixed to the upper surface of the central floor.

[0021] According to the above structure, the bottom of the vehicle body according to the present invention can be composed of a plate assembly, an upper component assembly, and a lower component assembly. The plate assembly, upper component assembly, and lower component assembly are vertically stacked, arranged, and joined, thereby improving the bending strength and torsional strength by increasing the structural rigidity of the vehicle body, and ultimately solving the problem of reduced quality and performance caused by the traditional vehicle body bottom joining structure.

[0022] The above-mentioned features and other features of the present invention will be discussed below. Attached Figure Description

[0023] The above and other features of the invention will now be described in detail with reference to certain exemplary embodiments illustrated in the accompanying drawings, which are illustrative only and therefore not limiting of the invention, wherein:

[0024] Figure 1 This is an exploded perspective view showing the bottom of a vehicle body according to the present invention.

[0025] Figures 2 to 5 This is a perspective view showing the joining of the bottom of a vehicle body according to the present invention.

[0026] Figures 6 to 8 This is a perspective view showing a plate assembly for the bottom of a vehicle body according to the present invention.

[0027] Figures 9 to 11 This is a perspective view showing a lower component assembly for the bottom of a vehicle body according to the present invention.

[0028] Figures 12 to 14 This is a perspective view showing an upper component assembly for the bottom of a vehicle body according to the present invention.

[0029] It should be understood that the accompanying drawings are not necessarily drawn to scale, but only show appropriately simplified depictions of various preferred features illustrating the basic principles of this application. Specific design features of the invention disclosed herein (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in some sections by the specific target application and the environment in which it is used.

[0030] Throughout these figures, the same reference numerals denote the same or equivalent parts of the invention. Detailed Implementation

[0031] It should be understood that the terms "vehicle" or "automobile" or other similar terms as used herein generally include general motor vehicles, such as passenger cars including sport utility vehicles (SUVs), public vehicles, trucks, various commercial vehicles, watercraft including various boats and ships, and aircraft, and also include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., vehicles that use non-gasoline energy sources as fuel). As mentioned herein, a hybrid vehicle is a vehicle with two or more power sources, such as both gasoline power and electric power.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. As described herein, the term “and / or” includes any and all combinations of one or more of the associated enumerated items. Throughout the specification, unless expressly stated to the contrary, the term “comprising” and variations such as “including” or “comprising” should be understood to imply the inclusion of the stated element but not exclude any other element. Furthermore, the terms “unit,” “device,” “component,” and “module” described in the specification mean a unit for performing at least one function and operation, and may be implemented by hardware components or software components and combinations thereof.

[0033] Furthermore, the control logic of this application can be implemented as a non-transient computer-readable medium on a computer-readable medium, which contains executable program instructions that are executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium can also be distributed across a network-connected computer system, such that the computer-readable medium is stored and executed in a distributed manner, for example, via a telematics server or a controller area network (CAN).

[0034] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings are provided for ease of explanation of exemplary embodiments of the invention and may differ from actual implementations.

[0035] The present invention relates to a vehicle body bottom, configured to form a floor inside the vehicle to support the front and rear seats, and multiple components constituting the vehicle body bottom can be arranged and joined in a vertically stacked structure, thereby solving the traditional problems of reduced vehicle body bottom mass and performance.

[0036] As defined herein, the term "reinforcement" refers to a component that provides reinforcement to the underside of a vehicle, such as a body underbody structure. The term "reinforcement" is synonymous with "strengthening" and can be used in the automotive industry to refer to such components.

[0037] like Figures 1 to 5 As shown, the vehicle body bottom according to the present invention includes: a panel assembly 100, an upper component assembly 200, and a lower component assembly 300. The panel assembly 100 is configured to form the floor of the vehicle interior; the upper component assembly 200 is configured to be stacked on the upper part of the panel assembly 100 and joined to the upper part of the panel assembly 100; and the lower component assembly 300 is configured to be stacked on the lower part of the panel assembly 100 and joined to the lower part of the panel assembly 100.

[0038] The panel assembly 100 is configured to support the front and rear seats located inside the vehicle and to separate the vehicle interior from the vehicle exterior.

[0039] like Figures 6 to 8 As shown, the panel assembly 100 may include a front panel 110, a central floor 120, a rear floor 140, and a vertical panel 130.

[0040] The front bulkhead 110 is configured to separate and divide the vehicle interior from the vehicle exterior. The vehicle exterior includes the engine compartment located in front of the front seats.

[0041] The central floor 120 engages and is secured to the lower end of the front bulkhead 110 and extends from the lower end of the front bulkhead 110 to the rear of the vehicle, thereby forming the floor of the front portion of the vehicle interior. For example, the front seats may be located on the floor of the front portion of the vehicle interior.

[0042] The front end of the central floor 120 is joined to the lower end of the front bulkhead 110, and the front end of the central floor 120 can be joined to the lower end of the front bulkhead 110 by welding.

[0043] All components forming the bottom of the vehicle body can be joined together by welding, and known joining techniques commonly used for joining components, other than welding, can be used. Furthermore, the components of the bottom of the vehicle body may have welding flanges, etc., for joining by welding.

[0044] Furthermore, the central floor 120 has a central passageway 122 on the horizontal central portion of the vehicle.

[0045] The central passage section 122 is configured to protrude upward from the central portion of the central floor 120. The central passage section 122 is formed into a curved rectangular structure that protrudes upward.

[0046] The rear floor 140 engages and is secured to the rear end of the central floor 120 and extends from the rear end of the central floor 120 to the rear of the vehicle, thereby forming the floor of the rear portion of the vehicle interior. For example, rear seats may be located on the floor of the rear portion of the vehicle interior.

[0047] The front end of the rear floor 140 is joined to the rear end of the central floor 120, and the front end of the rear floor 140 can be joined to the rear end of the central floor 120 by welding.

[0048] The rear floor 140 may have a luggage compartment panel component 142 at its rear. The luggage compartment panel component 142 is the part of the floor and sidewall that forms the luggage compartment space and is located at the rear of the vehicle interior. The luggage compartment panel component 142 may be formed to curve downward and recess from the rear portion of the rear floor 140. Spare tires and the like can be stored in the luggage compartment space.

[0049] The rear floor 140 can be connected to the central floor 120 via a vertical plate 130.

[0050] The upper end of the vertical plate 130 is engaged and fixed to the front end of the rear floor 140, and the lower end of the vertical plate 130 is engaged and fixed to the rear end of the central floor 120, thereby connecting the rear end of the central floor 120 to the front end of the rear floor 140.

[0051] The vertical plate 130 can extend vertically from the rear end of the central floor 120 to the front end of the rear floor 140.

[0052] like Figures 2 to 5 As shown, the lower component assembly 300 is configured to be stacked on the lower side of the plate assembly 100 and fixed to the lower side of the plate assembly 100, and fixed to the side portion of the plate assembly 100 and the side portion of the upper component assembly 200.

[0053] like Figures 9 to 11 As shown, the lower component assembly 300 includes a main longitudinal component and a reinforcing component. The main longitudinal component consists of a pair of lower side beams 310a and 310b, a pair of front longitudinal beams 320a and 320b, and a pair of rear longitudinal beams 330a and 330b. The reinforcing component consists of a front transverse component 340 and a rear transverse component 350.

[0054] The main longitudinal member is the main component that forms the basic skeleton of the lower component assembly 300, in order to absorb collision energy.

[0055] Furthermore, the lower component assembly 300 may include a bracket 380 and channel side reinforcements 370a, 370b for reinforcing the central passage section 122, and a luggage space reinforcement 360 for reinforcing the luggage space panel component 142.

[0056] Each of the pair of lower side beams 310a and 310b can be configured as a beam having a predetermined length in the longitudinal direction of the vehicle. When the lower component assembly 300 is engaged with the plate assembly 100, the pair of lower side beams 310a and 310b are fixed to each of the left and right ends of the central floor 120.

[0057] Each of the left and right ends of the central floor 120 may be provided with a central side flange 121. The central side flange 121 may be joined and fixed to the lower portion of the side surface of the lower side beams 310a, 310b by welding. The ends of the seat transverse members 230a, 230b constituting the upper component assembly 200 are joined and fixed to the upper portion of the side surface of the lower side beams 310a, 310b.

[0058] Each of the pair of front longitudinal beams 320a and 320b can be configured as a beam with a curved rear portion. Each of the pair of front longitudinal beams 320a and 320b is joined and fixed to the front end of the lower beams 310a and 310b. The rear end of the front longitudinal beam 320a located on the left side is joined to the front end of the lower beam 310a located on the left side, and the rear end of the front longitudinal beam 320b located on the right side is joined to the front end of the lower beam 310b located on the right side.

[0059] When the lower component assembly 300 is joined to the plate assembly 100, the front longitudinal beams 320a and 320b are joined and fixed to the lower portion of the front surface of the front bulkhead 110. The rear portion of the front longitudinal beam 320a located on the left side can be joined to the lower left portion of the front bulkhead 110 by welding, and the rear portion of the front longitudinal beam 320b located on the right side can be joined to the lower right portion of the front bulkhead 110 by welding. The front portions of the front longitudinal beams 320a and 320b are configured to extend to the front of the front bulkhead 110.

[0060] Each of a pair of rear longitudinal beams 330a and 330b can be configured as a beam with a curved front portion. Each of the pair of rear longitudinal beams 330a and 330b engages and is fixed to the rear portion of the lower side beams 310a and 310b. The front portion of the left-side rear longitudinal beam 330a engages with the rear portion of the left-side lower side beam 310a, and the rear longitudinal beam 330a is positioned inside the vehicle compared to the lower side beam 310a. The front portion of the right-side rear longitudinal beam 330b engages with the rear portion of the right-side lower side beam 310b, and the rear longitudinal beam 330b is positioned inside the vehicle compared to the lower side beam 310b.

[0061] When the lower component assembly 300 is joined to the plate assembly 100, the rear longitudinal beams 330a and 330b are joined and fixed to the lower surface of the rear floor 140. The rear longitudinal beam 330a, located on the left side, can be joined to the lower left surface of the rear floor 140 by welding, and the rear longitudinal beam 330b, located on the right side, can be joined to the lower right surface of the rear floor 140 by welding. The rear longitudinal beams 330a and 330b can be configured to extend to the rear end of the rear floor 140.

[0062] Furthermore, each of the rear longitudinal beams 330a and 330b is also joined and secured to the left and right portions of the rear floor 140. Each of the rear longitudinal beams 330a and 330b can be configured to have a bending shape. The cross-sectional structure of the rear longitudinal beams 330a and 330b has an outer wall that can extend to and be fixed to the side portion of the rear floor 140. The left and right portions of the rear floor 140 may be provided with rear side flanges 141. The rear side flanges 141 can be welded to the left side wall of the left-side rear longitudinal beam 330a and the right side wall of the right-side rear longitudinal beam 330b, respectively.

[0063] The front transverse member 340 is configured to connect the front ends of a pair of rear longitudinal beams 330a and 330b. The front transverse member 340 is formed to extend in the left-right direction of the vehicle and connects the front end of the left-side rear longitudinal beam 330a to the front end of the right-side rear longitudinal beam 330b. At this time, the left portion of the front transverse member 340 engages and is fixed to the front end of the left-side rear longitudinal beam 330a, and the right portion of the front transverse member 340 engages and is fixed to the front end of the right-side rear longitudinal beam 330b.

[0064] When the lower component assembly 300 is joined to the plate assembly 100, the front transverse component 340 is joined and fixed to the rear surface of the vertical plate 130. The front transverse component 340 can be joined to the rear surface of the vertical plate 130 by welding.

[0065] The rear transverse member 350 is spaced apart from the rear portion of the front transverse member 340 and is configured to connect the central portions of a pair of rear longitudinal beams 330a and 330b. The rear transverse member 350 is formed to extend in the left-right direction (i.e., the lateral direction) of the vehicle. The left portion of the rear transverse member 350 engages and is fixed to the central portion of the rear longitudinal beam 330a located on the left side, and the right portion of the rear transverse member 350 engages and is fixed to the central portion of the rear longitudinal beam 330b located on the right side.

[0066] When the lower component assembly 300 is engaged with the plate assembly 100, the rear transverse component 350 is engaged and secured to the lower surface of the rear floor 140. The rear transverse component 350 can be engaged to the lower surface of the rear floor 140 by welding.

[0067] A trunk space reinforcement 360, extending laterally, is disposed at the rear of the rear transverse member 350. The trunk space reinforcement 360 is configured to connect the rear portions of a pair of rear longitudinal beams 330a and 330b. The left end of the trunk space reinforcement 360 can be welded to the rear portion of the left-side rear longitudinal beam 330a, and the right end of the trunk space reinforcement 360 can be welded to the rear portion of the right-side rear longitudinal beam 330b.

[0068] The luggage space reinforcement 360 may have a central portion configured to be smoothly curved to correspond to the sidewall surface structure of the luggage space panel member 142. When the lower component assembly 300 is engaged with the panel assembly 100, the central portion of the luggage space reinforcement 360 is engaged and secured to the sidewall surface of the luggage space panel member 142. The central portion of the luggage space reinforcement 360 may be engaged and secured to the sidewall surface of the luggage space panel member 142 by welding.

[0069] The luggage space enhancement 360 can be connected to the rear transverse member 350 via at least one connecting member 362. That is, the connecting member 362 is configured to connect the luggage space enhancement 360 to the rear transverse member 350. The front end of the connecting member 362 engages and is secured to the rear transverse member 350, and the rear end of the connecting member 362 engages and is secured to the luggage space enhancement 360.

[0070] When the lower component assembly 300 is joined to the plate assembly 100, the connecting member 362 can be joined to the lower surface of the rear floor 140 by welding.

[0071] Each of the pair of channel side reinforcements 370a, 370b is formed to extend in the longitudinal direction (i.e., the longitudinal direction) of the vehicle and is configured to connect the front longitudinal beams 320a, 320b to the front transverse member 340.

[0072] The longitudinal front ends of a pair of channel-side reinforcement members 370a and 370b are fixed to the rear portions of the corresponding front longitudinal beams 320a and 320b, and the longitudinal rear ends of the pair of channel-side reinforcement members 370a and 370b are fixed to the left and right portions of the front transverse member 340, respectively. The front and rear ends of the right-side channel-side reinforcement member 370b can be welded to the rear portion of the right-side front longitudinal beam 320b and the right portion of the front transverse member 340, respectively. The left-side channel-side reinforcement member 370a can be welded to the rear portion of the left-side front longitudinal beam 320a and the left portion of the front transverse member 340, respectively.

[0073] When the lower component assembly 300 is engaged with the plate assembly 100, a pair of channel side reinforcements 370a and 370b are engaged and secured to the lower surface of the central floor 120.

[0074] A pair of channel-side reinforcements 370a and 370b are connected to each other via at least one bracket 380.

[0075] That is, the bracket 380 is configured to connect a pair of channel-side reinforcements 370a and 370b. The bracket 380 is configured to have a curved structure similar to or the same as the curved structure of the central channel portion 122. The right end of the bracket 380 is engaged and fixed to the channel-side reinforcement 370b provided on the right side, and the left end of the bracket 380 is engaged and fixed to the channel-side reinforcement 370a provided on the left side.

[0076] When the lower component assembly 300 is engaged with the plate assembly 100, the bracket 380 is engaged with and fixed to the lower surface of the central channel portion 122.

[0077] If multiple supports 380 are disposed between a pair of channel-side reinforcements 370a, 370b, then the multiple supports 380 are configured to be spaced apart from each other in the longitudinal direction.

[0078] like Figures 2 to 5 As shown, the upper component assembly 200 is configured to be stacked on and engaged with the upper portion of the plate assembly 100, and also engaged with the lower component assembly 300. The upper component assembly 200 engages with components of the lower component assembly 300 that project upwards from the plate assembly 100.

[0079] like Figures 12 to 14 As shown, the upper component assembly 200 includes a front bulkhead reinforcement 210, a channel reinforcement 220, a plurality of seat transverse members 230a, 230b, a lower front bulkhead member 240, and a pair of front side reinforcements 250a, 250b.

[0080] The front bulkhead reinforcement 210 is joined to the rear surface of the front bulkhead 110 to reinforce the front bulkhead 110. The front bulkhead reinforcement 210 may be formed to extend in the lateral direction and be joined to the upper portion of the rear surface of the front bulkhead 110 by welding.

[0081] When the upper component assembly 200 is engaged with the plate assembly 100, the front bulkhead reinforcement 210 is engaged and secured to the front bulkhead plate 110.

[0082] The channel reinforcement 220 is configured to be fixed to the upper portion of the central channel portion 122 to reinforce the central channel portion 122. The channel reinforcement 220 is bent to cover the upper portion of the central channel portion 122. The channel reinforcement 220 can be formed to approximately... The shape is curved.

[0083] The channel reinforcement 220 can be fixed to the upper part of the central channel portion 122 in such a way that it covers the upper surface and the upper part of the side surface of the central channel portion 122. The lower part of the side surface of the central channel portion 122 is not covered by the channel reinforcement 220.

[0084] The channel reinforcement 220 is connected to the front bulkhead reinforcement 210 via the lower front bulkhead member 240 and is formed to extend in the longitudinal direction (i.e., the longitudinal direction) of the vehicle. The front end of the channel reinforcement 220 engages and is secured to the lower front bulkhead member 240, and the rear end of the channel reinforcement 220 engages and is secured to the vertical plate 130.

[0085] When the upper component assembly 200 is engaged with the plate assembly 100, the channel reinforcement 220 is engaged and secured to the upper part of the central channel portion 122 and the front surface of the vertical plate 130.

[0086] The lower front bulkhead member 240 is joined and secured to the front bulkhead reinforcement 210 and the channel reinforcement 220. The lower front bulkhead member 240 can be joined to the lower end of the front bulkhead reinforcement 210 and the front end of the channel reinforcement 220 by welding.

[0087] When the upper component assembly 200 is engaged with the panel assembly 100, the lower front panel component 240 is engaged and secured to the lower portion of the rear surface of the front panel 110.

[0088] Multiple seat transverse members 230a, 230b are joined and secured to the side surface of the channel reinforcement 220. The seat transverse members 230a, 230b are formed with a generally curved shape. The structure is in the form of a beam and is arranged to extend laterally inside the vehicle.

[0089] The seat transverse members 230a and 230b have a first end that engages and is fixed to the side surface of the channel reinforcement 220 in the longitudinal direction, and a second end that engages and is fixed to the side surface of the lower side beams 310a and 310b in the longitudinal direction. Further, the central portion between the first and second ends of the seat transverse members 230a and 230b engages and is fixed to the upper surface of the central floor 120, with the first end engaging to the side surface of the channel reinforcement 220 and also engaging to the side surface of the central channel portion 122.

[0090] Furthermore, when the upper component assembly 200 is not engaged with the plate assembly 100, that is, before the upper component assembly 200 is engaged with the plate assembly 100, the seat transverse members 230a and 230b are in a state where only the first ends of the seat transverse members 230a and 230b are engaged with the side surface of the channel reinforcement 220.

[0091] When the upper component assembly 200 is engaged with the plate assembly 100, the central portion of the seat transverse components 230a and 230b is engaged with the upper surface of the central floor 120, the first end of the seat transverse components 230a and 230b is engaged with the lower portion of the side surface of the central passage portion 122, and the second end of the seat transverse components 230a and 230b is engaged with the side surface of the lower side beams 310a and 310b.

[0092] The first ends of the seat transverse members 230a and 230b may be provided with a first flange 231 that engages with the side surface of the channel reinforcement 220, and a second flange 232 that engages with the lower portion of the side surface of the central channel portion 122. The central portion of the seat transverse members 230a and 230b may be provided with a lower flange 233 that engages with the upper surface of the central floor 120.

[0093] The second ends of the seat transverse members 230a and 230b are engaged and fixed to the upper portion of the side surfaces of the lower side beams 310a and 310b. When the lower member assembly 300 is engaged with the plate assembly 100, the upper portion of the side surfaces of the lower side beams 310a and 310b is configured to protrude upward from the central floor 120.

[0094] The seat lateral components 230a and 230b can be located under the front seats inside the vehicle.

[0095] At least one seat lateral member 230a engages with the left surface of the channel reinforcement 220, and at least one seat lateral member 230b engages with the right surface of the channel reinforcement 220. An equal number of seat lateral members 230a, 230b may engage with the left and right surfaces of the channel reinforcement 220.

[0096] Furthermore, the seat lateral member 230a, which is engaged with the left surface of the channel reinforcement 220, and the seat lateral member 230b, which is engaged with the right surface of the channel reinforcement 220, can be configured to be symmetrical about left and right with respect to the channel reinforcement 220.

[0097] Each of the pair of front side reinforcements 250a and 250b is engaged and secured to the left and right ends of the lower front bulkhead member 240 and is disposed below the front bulkhead reinforcement 210.

[0098] Each of the front side reinforcements 250a and 250b can be formed into a generally V-shaped or U-shaped structure, and the left or right end of the lower front member 240 can be joined to the bent portion by welding.

[0099] When the upper component assembly 200 is engaged with the plate assembly 100, a pair of front side reinforcements 250a and 250b can be engaged and fixed to the lower portion of the rear surface of the front bulkhead 110 and are disposed at the rear of the front longitudinal beams 320a and 320b. When the lower component assembly 300 is engaged with the plate assembly 100, the front longitudinal beams 320a and 320b are engaged to the lower portion of the front surface of the front bulkhead 110.

[0100] Specifically, the front side reinforcement 250a, which is attached to the left end of the lower front bulkhead member 240, can be welded to the lower left portion of the front bulkhead 110. The front side reinforcement 250b, which is attached to the right end of the lower front bulkhead member 240, can be welded to the lower right portion of the front bulkhead 110.

[0101] As described above, exemplary embodiments of the present invention have been described in detail, and the terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings. Furthermore, the exemplary embodiments described in this specification and the components shown in the accompanying drawings are merely one exemplary embodiment of the present invention. Therefore, the scope of the present invention is not limited to the above exemplary embodiments, and various modifications and improvements made by those skilled in the art using the basic concepts of the present invention as defined in the appended claims are also included within the scope of the present invention.

Claims

1. A body bottom for a vehicle, comprising: a panel assembly configured to form a floor of an interior of the vehicle; an upper member assembly configured to be layered on an upper side of the panel assembly and joined to the upper side of the panel assembly; and a lower member assembly configured to be layered on a lower side of the panel assembly and joined to the lower side of the panel assembly, and the lower member assembly is joined to side portions of the panel assembly and side portions of the upper member assembly; wherein the panel assembly comprises: a center floor configured to form a floor of a front portion of the interior of the vehicle, the center floor including a center tunnel portion; and a rear floor fixed to a rear end of the center floor and extending rearward from the rear end of the center floor to form a floor of a rear portion of the interior of the vehicle; wherein the lower member assembly comprises: a pair of lower side sills fixed to each of left and right ends of the center floor; a pair of front longitudinal members, rear portions of the pair of front longitudinal members being fixed to front ends of each of the lower side sills; a pair of rear longitudinal members fixed to rear portions of each of the lower side sills to extend to the rear end of the rear floor and fixed to each of left and right portions of the rear floor; a front cross member connecting front ends of the pair of rear longitudinal members; a rear cross member disposed rearward of the front cross member and connecting central portions of the pair of rear longitudinal members and fixed to a lower surface of the rear floor; a pair of tunnel side reinforcements, front ends of the pair of tunnel side reinforcements being fixed to rear portions of each of the front longitudinal members, rear ends of the pair of tunnel side reinforcements being fixed to each of left and right portions of the front cross member, and the pair of tunnel side reinforcements being fixed to a lower surface of the center floor; and at least one bracket connecting the pair of tunnel side reinforcements and fixed to the lower surface of the center tunnel portion; wherein the upper member assembly comprises: a tunnel reinforcement fixed to the center floor; and a plurality of seat cross members, a first end of each of the plurality of seat cross members being fixed to a side surface of the tunnel reinforcement, and a second end of each of the plurality of seat cross members being fixed to an upper portion of the lower side sill.

2. The underbody for a vehicle according to claim 1, wherein the panel assembly further comprises: a front wall configured to separate the interior of the vehicle and an exterior of the vehicle; and the center floor fixed to a lower end of the front wall and extending rearward from the lower end of the front wall to form the floor of the front portion of the interior of the vehicle.

3. The underbody for a vehicle according to claim 2, wherein the panel assembly further comprises a vertical panel, an upper end of the vertical panel being fixed to a front end of the rear floor, and a lower end of the vertical panel being fixed to a rear end of the center floor to connect the center floor to the rear floor.

4. The underbody for a vehicle according to claim 2, wherein the center floor has the center tunnel portion protruding upward at a central portion thereof.

5. The underbody for a vehicle according to claim 3, wherein the rear floor has a trunk space panel portion recessed downward at a rear portion thereof.

6. The body bottom for a vehicle according to claim 5, wherein, rear portions of the pair of front longitudinal members are fixed to a lower portion of a front surface of the front wall, and front portions of the pair of front longitudinal members extend to the front face of the front wall; and the front cross member is fixed to the vertical panel.

7. The underbody for a vehicle according to claim 6, wherein the lower member assembly further comprises: a trunk space reinforcement provided at a rear portion of the rear cross member, connecting rear portions of a pair of rear side members and fixed to the trunk space panel member; and a connecting member connecting the trunk space reinforcement to the rear cross member and fixed to a lower surface of the rear floor.

8. The underbody for a vehicle according to claim 6, wherein The upper member assembly further includes: a cowl reinforcement fixed to an upper portion of a rear surface of the cowl panel to reinforce the cowl panel; the tunnel reinforcement fixed to an upper portion of the central tunnel portion to reinforce the central tunnel portion; and a cowl lower member fixed to a lower end of the cowl reinforcement and a front end of the tunnel reinforcement to connect the cowl reinforcement to the tunnel reinforcement, and the cowl lower member is fixed to a lower portion of the rear surface of the cowl panel.

9. The underbody for a vehicle according to claim 8, wherein The upper member assembly is configured to include a pair of front side reinforcements fixed to left and right ends of the cowl lower member, respectively, and fixed to a lower portion of the rear surface of the cowl panel.

10. The underbody for a vehicle according to claim 8, wherein a rear end of the tunnel reinforcement is joined to and fixed to the vertical panel.

11. The underbody for a vehicle according to claim 8, wherein a first end of the seat cross member is fixed to a side surface of the tunnel reinforcement and fixed to a side surface of the central tunnel portion, and a central portion between the first and second ends of the seat cross member is fixed to an upper surface of the central floor.

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