Vehicle body floor structure

Abstract

The present application provides a vehicle body floor structure capable of appropriately preventing distortion and deformation of a floor portion. A vehicle body floor structure (1) has: a lower wall portion (13) and a main body portion (21) as a floor portion erected between a pair of lower side members in a vehicle width direction; and an upper wall portion (11) and side wall portions (12, 12) as a tunnel portion extending in a front-rear direction at a middle portion in the vehicle width direction of the floor portion and upwardly in a convex shape, a plurality of first ridgelines (81a, 81b, 82a, 82b) extending in the vehicle width direction from a boundary portion between the floor portion and the tunnel portion are formed, and the plurality of first ridgelines (81a, 81b, 82a, 82b) are inclined in a manner that tends toward the front as it tends toward the outside in the vehicle width direction.

Description

Technical Field

[0001] This invention relates to the construction of vehicle body floor. Background Technology

[0002] As a floor structure for a vehicle, Patent Document 1 describes a structure in which an arc-shaped reinforcing rib is arranged near the corner where the side component intersects with the crossbeam. The reinforcing rib extends in the left-right direction within the vehicle body, effectively dispersing the impact load during a vehicle collision and avoiding stress concentration.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-121471 Summary of the Invention

[0006] Sometimes a torsional load is applied to the floor of a vehicle, but the reinforcing ribs described in Patent Document 1 cannot adequately suppress the distortion and deformation (such as breakage) of the floor caused by this torsional load.

[0007] The present invention was made in view of the above points, and its objective is to provide a vehicle body floor structure that can properly prevent the distortion and deformation of the floor portion.

[0008] To solve the above-mentioned problems, the vehicle floor structure of the present invention is characterized by having: a floor portion erected between a pair of lower longitudinal beams in the vehicle width direction; and a channel portion extending in the front-rear direction and convex upward at the middle portion in the vehicle width direction of the floor portion, wherein a plurality of first ridge lines extending in the vehicle width direction from the boundary portion between the floor portion and the channel portion are formed in the floor portion, and the plurality of first ridge lines are inclined in a forward manner as they tend to the outer side in the vehicle width direction.

[0009] Invention Effects

[0010] According to the present invention, by dispersing the stress (torsional load) concentrated near the channel portion to the ridge line extending obliquely, the rigidity against the stress can be improved, and the distortion and deformation of the floor portion can be properly prevented. Attached Figure Description

[0011] Figure 1 This is a top view schematically illustrating the vehicle floor structure according to an embodiment of the present invention.

[0012] Figure 2 This is a bottom view schematically illustrating the vehicle floor structure according to an embodiment of the present invention.

[0013] Figure 3 yes Figure 1 Sectional view along line III-III.

[0014] Figure 4 This is a partially enlarged perspective view schematically illustrating the first and second ridge lines in the vehicle floor structure according to an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures

[0016] 1. Body panel structure

[0017] 3 Lower Longitudinal Beams

[0018] 4 subframes

[0019] 10-channel component

[0020] 11. Upper wall section (passage section)

[0021] 12. Side wall section (passage section)

[0022] 13. Lower wall section (floor section)

[0023] 20 floor components

[0024] 21 Main Body (Floor Section)

[0025] 30 floor beams

[0026] 60 floor frame

[0027] 70 extension components

[0028] 80 Reinforcing Rib Section

[0029] 81a, 81b, 82a, 82b First edge lines

[0030] 84a, 84b, 85a, 85b Second edge lines Detailed Implementation

[0031] Next, embodiments of the present invention will be described in detail with appropriate reference to the accompanying drawings. Furthermore, in the accompanying drawings, "front and rear" refers to the forward and backward direction of the vehicle, "left and right" refers to the left and right direction (vehicle width direction) as seen from the driver's seat, and "up and down" refers to the up and down direction when the vehicle is on a horizontal plane.

[0032] like Figure 1 As shown, the vehicle floor structure 1 of this embodiment of the invention forms the floor of the vehicle body (cabin) between a pair of lower longitudinal beams 3, 3 on the rear side of the dashboard 2 and in the vehicle width direction.

[0033] <Dashboard>

[0034] Instrument panel 2 is a plate-shaped metal component that divides the power compartment formed on the front side of instrument panel 2 and the passenger compartment formed on the rear side of instrument panel 2.

[0035] <Lower longitudinal beam>

[0036] The lower longitudinal beam 3 is a metal component with a closed cross-section that extends along the longitudinal direction from the lower part of the vehicle body in the vehicle compartment and at the end in the vehicle width direction. The lower longitudinal beam 3 is constructed, for example, by combining an inner member of the lower longitudinal beam that constitutes the interior of the lower longitudinal beam 3 in the vehicle width direction and an outer member of the lower longitudinal beam that constitutes the exterior of the lower longitudinal beam 3 in the vehicle width direction. Figure 1 Only the internal components of the lower longitudinal beam 3 are shown in the drawing.

[0037] The vehicle body floor structure 1, as a component constituting the passenger compartment floor, includes a passageway component 10 and a pair of floor components 20, 20 in the vehicle width direction. Furthermore, the vehicle body floor structure 1, as a component located on the upper side of the passenger compartment floor, includes a floor crossbeam 30 and multiple seat brackets 40, 50. Additionally, as... Figure 2 As shown, the vehicle floor structure 1 has a pair of floor frames 60, 60 in the vehicle width direction as a component located on the lower side of the vehicle floor.

[0038] <Channel Components>

[0039] like Figure 1 As shown, the passage component 10 is a roughly hat-shaped metal component that forms the middle part of the floor in the vehicle width direction of the vehicle compartment. The front end of the passage component 10 coincides with the lower end of the instrument panel 2 and is joined to the lower end by welding or the like. The passage component 10 integrally has an upper wall portion 11, a pair of side wall portions 12, 12 extending downward from both ends of the upper wall portion 11 in the vehicle width direction, and lower wall portions 13, 13 extending outward from the lower end of the side wall portions 12 in the vehicle width direction.

[0040] The upper wall portion 11 and a pair of side wall portions 12, 12 constitute a passageway that extends upward and convexly forms at the middle of the floor portion in the vehicle width direction. The lower wall portion 13 constitutes part of the floor portion that is supported between a pair of lower longitudinal beams 3, 3 in the vehicle width direction. The vertical height of the passageway portion (upper wall portion 11) relative to the floor portion (lower wall portion 13) is set in a manner that decreases towards the rear (see reference). Figure 3 Arrows H1, H2, and H3.

[0041] A reinforcing rib 80 is formed in the channel component 10. The reinforcing rib 80 will be described in detail below.

[0042] In this embodiment, the corner formed by the boundary between the upper wall portion 11 and the side wall portion 12 of the passage member 10 is reinforced by a reinforcing member 100. The reinforcing member 100 is an L-shaped metal component extending in the front-rear direction. The reinforcing member 100 integrally has an upper wall portion 101 and a lower wall portion 102 extending downward from the outer end of the upper wall portion 101 in the vehicle width direction. The upper wall portion 101 overlaps with the vehicle width direction end of the upper wall portion 11 of the passage member 10 from above and is joined to that portion by welding or the like. The side wall portion 102 overlaps with the upper end of the side wall portion 12 of the passage member 10 from the outer side in the vehicle width direction and is joined to that portion by welding or the like.

[0043] Floor components

[0044] The floor component 20 is a plate-shaped metal component that forms the floor of the vehicle compartment between the passage component 10 and the lower longitudinal beam 3. The floor component 20 integrally has a main body 21 and a flange 22 extending upward from the outer end of the main body 21 in the vehicle width direction.

[0045] The main body 21 constitutes the main part of the floor section mounted between a pair of lower longitudinal beams 3, 3 in the vehicle width direction. The front end of the main body 21 coincides with the lower end of the instrument panel 2 and is joined to the lower end by welding or the like. The flange 22 coincides with the inner side of the lower longitudinal beam 3 in the vehicle width direction from the inner side in the vehicle width direction and is joined to the inner side of the lower longitudinal beam 3 in the vehicle width direction by welding or the like.

[0046] Floor beams

[0047] The floor crossbeam 30 is a metal component that extends outward in the vehicle width direction from the side wall portion 12 of the passage component 10 and cooperates with the lower wall portion 13 of the passage component 10 and the main body portion 21 of the floor component 20 to form a closed cross section extending in the vehicle width direction, with a generally hat-shaped shape. The inner end of the floor crossbeam 30 in the vehicle width direction is joined to the side wall portion 12 and the upper wall portion 11 of the passage component 10 by welding or the like. The outer end of the floor crossbeam 30 in the vehicle width direction is located near the inner wall portion of the lower longitudinal beam 3 and is directly or indirectly connected to this inner wall portion. The floor crossbeam 30 transmits the side impact load input from the lower longitudinal beam 3 to the passage portion during a side impact of the vehicle.

[0048] The floor crossbeam 30 integrally includes an upper wall portion 31, a front wall portion 32 extending downward from the front end of the upper wall portion 31, and a rear wall portion 33 extending downward from the rear end of the upper wall portion 31. Furthermore, the floor crossbeam 30 integrally includes a flange portion 34 extending inward from the inner end of the upper wall portion 31 in the vehicle width direction, a flange portion 35 extending forward from the inner end of the front wall portion 32 in the vehicle width direction, and a flange portion 36 extending forward from the lower end of the front wall portion 32. Additionally, the floor crossbeam 30 integrally includes a flange portion 37 extending rearward from the inner end of the rear wall portion 33 in the vehicle width direction, and a flange portion 38 extending rearward from the lower end of the rear wall portion 33.

[0049] Flange 34 is joined to the upper wall 11 of the channel member 10 from above by welding or the like. Flanges 35 and 37 are joined to the side wall 12 of the channel member 10 from the outside in the vehicle width direction by welding or the like. Flanges 36 and 38 are joined to the lower wall 13 of the channel member 10 from above by welding or the like.

[0050] <Seat bracket>

[0051] The seat bracket 40 is a metal component used to secure the seat in the vehicle interior. In this embodiment, a pair of seat brackets 40F and 40R are provided for each seat (driver's seat or front passenger seat). The front seat bracket 40F is located in front of the inner end of the floor beam 30 in the vehicle width direction. The rear seat bracket 40R is located behind the inner end of the floor beam 30 in the vehicle width direction.

[0052] The seat bracket 40 integrally includes an upper wall portion 41 for securing the seat, a front wall portion 42 extending downward from the front end of the upper wall portion 41, a rear wall portion 43 extending downward from the rear end of the upper wall portion 41, and an outer wall portion 44 extending downward from the outer end of the upper wall portion 41 in the vehicle width direction. Additionally, the seat bracket 40 integrally includes a flange portion 45 extending forward from the lower end of the front wall portion 42, a flange portion 46 extending rearward from the lower end of the rear wall portion 43, and a flange portion 47 extending outward in the vehicle width direction from the lower end of the outer wall portion 44.

[0053] The front seat bracket 40F has an integral flange portion 48 extending inward from the inner end of the upper wall portion 41 in the vehicle width direction. The rear seat bracket 40R has an integral flange portion 49F extending forward from the inner end of the front wall portion 42 in the vehicle width direction and a flange portion 49R extending rearward from the inner end of the rear wall portion 43 in the vehicle width direction.

[0054] Flanges 45, 46, and 47 overlap with the lower wall 13 of the passage component 10 from above and are joined to the lower wall 13 by welding or the like. The rear end of the flange 46 of the front seat bracket 40F overlaps with the flange 36 of the floor crossbeam 30 from above and is joined to the flange 36 by welding or the like. The front end of the flange 45 of the rear seat bracket 40R overlaps with the flange 38 of the floor crossbeam 30 from above and is joined to the flange 38 by welding or the like. Flange 48 overlaps with the upper wall 11 of the passage component 10 from above and is joined to the upper wall 11 by welding or the like. Flanges 49F and 49R overlap with the side wall 12 of the passage component 10 from the outside in the vehicle width direction and are joined to the side wall 12 by welding or the like.

[0055] <Seat bracket>

[0056] The seat bracket 50 is a metal component used to secure the seat in the vehicle interior. In this embodiment, a pair of seat brackets 50F and 50R are provided for each seat (driver's seat or front passenger seat). The front seat bracket 50F is located in front of the outer end of the floor beam 30 in the vehicle width direction. The rear seat bracket 50R is located behind the outer end of the floor beam 30 in the vehicle width direction.

[0057] The seat bracket 50 integrally includes an upper wall portion 51 for securing the seat, a front wall portion 52 extending downward from the front end of the upper wall portion 51, a rear wall portion 53 extending downward from the rear end of the upper wall portion 51, and an inner wall portion 54 extending downward from the inner end of the upper wall portion 51 in the vehicle width direction. Furthermore, the seat bracket 50 integrally includes a flange portion 55 extending forward from the lower end of the front wall portion 52, a flange portion 56 extending rearward from the lower end of the rear wall portion 53, and a flange portion 57 extending inward in the vehicle width direction from the lower end of the inner wall portion 54. Additionally, the seat bracket 50 integrally includes a flange portion 58 extending inward in the vehicle width direction from the inner end of the upper wall portion 51.

[0058] Flanges 55, 56, and 57 overlap with the main body 21 of the floor component 20 from above and are joined to the main body 21 by welding or the like. The rear end of the flange 56 of the front seat bracket 50F overlaps with the flange 36 of the floor crossbeam 30 from above and is joined to the flange 36 by welding or the like. The front end of the flange 55 of the rear seat bracket 50R overlaps with the flange 38 of the floor crossbeam 30 from above and is joined to the flange 38 by welding or the like. The flange 58 overlaps with the upper wall of the lower longitudinal beam 3 from above and is joined to the upper wall by welding or the like.

[0059] <Floor Frame>

[0060] like Figure 2As shown, the floor frame (first floor frame) 60 is a metal component with a generally hat-shaped closed cross-section extending in the front-rear direction, which cooperates with the main body 21 of the floor component 20 between the passage section and the lower longitudinal beam 3. The floor frame 60 integrally has a lower wall portion 61, an inner wall portion 62 extending upward from the inner end in the vehicle width direction of the lower wall portion 61, and an outer wall portion 63 extending upward from the outer end in the vehicle width direction of the lower wall portion 61. In addition, the floor frame 60 integrally has a flange portion 64 extending inward in the vehicle width direction from the inner end in the vehicle width direction of the inner wall portion 62 and a flange portion 65 extending outward in the vehicle width direction from the outer end in the vehicle width direction of the outer wall portion 63.

[0061] Flanges 64 and 65 overlap with the main body 21 of the floor component 20 from below and are joined to the main body 21 by welding or the like.

[0062] like Figure 3 As shown, a connecting portion 60a for connecting to the subframe 4 is formed at the front end of the floor frame 60. The connecting portion 60a is bulging downward from the lower wall portion 61. The vertical position of the connecting portion 60a is set at the same height as the vertical position of the rear end portion of the subframe 4.

[0063] In this embodiment, another floor frame (second floor frame) 110 is provided between the floor frame 60 and the lower longitudinal beam 3. Like the floor frame 60, the floor frame 110 is a metal component that cooperates with the main body 21 of the floor component 20 to form a generally hat-shaped closed cross section extending in the front-rear direction.

[0064] <Subframe>

[0065] The subframe 4 is located at the front compared to the passage section. It is a metal frame component in the power compartment formed in front of the instrument panel 2, which is used to mount the engine, motor and wheel (front wheel) suspension that serve as the power source of the vehicle.

[0066] <Extension Components>

[0067] In this embodiment, the subframe 4 and the floor frame 60 are connected to each other via an extension member 70. The extension member 70 is a metal plate-shaped member extending in the front-rear direction. The front end of the extension member 70 coincides with the rear end of the subframe 4 from below and is fixed to the rear end of the subframe 4 from below by bolts or the like. The rear end of the extension member 70 coincides with the connection portion 60a of the floor frame 60 from below and is fixed to the connection portion 60a by bolts or the like.

[0068] <Reinforcing Ribs (First and Second Ribs)>

[0069] like Figure 4As shown, a reinforcing rib 80 is formed in the passage component 10. The reinforcing rib 80 is formed across the side wall portion 12 and the lower wall portion 13. The reinforcing rib 80 is formed inside the subframe 60 (specifically, the connecting portion 60a) in the vehicle width direction. In addition, in the longitudinal direction, the reinforcing rib 80 is formed rearward compared to the connecting portion 60a and forward compared to the floor crossbeam 30.

[0070] In the lower wall portion 13, the reinforcing rib portion 80 has multiple first ridges arranged in the front-back direction, including first ridges 81a and 81b of odd numbered from the front and 82a and 82b of even numbered from the front. In addition, the reinforcing rib portion 80 has front and rear ridges 83a and 83b.

[0071] The first edge lines 81a and 81b of the odd-numbered groups extend outward in the vehicle width direction from the boundary portion with the sidewall portion 12, inclined forward as they move outward in the vehicle width direction. The first edge lines 82a and 82b of the even-numbered groups extend outward in the vehicle width direction from the boundary portion with the sidewall portion 12, inclined forward as they move outward in the vehicle width direction. The first edge lines 81a, 81b, 82a, and 82b are distorted as follows (see...). Figure 2 The distortion extends in the direction of the intersection of the thick line X (preferably the orthogonal direction), and this distortion is caused by the load in the torsional direction input from the subframe 4 to the floor via the connecting part 60a due to steering, the lifting of the shock absorber, etc.

[0072] The front and rear ridges 83a and 83b connect the outer ends of the first ridges 82a and 82b in the vehicle width direction to the outer ends of the first ridges 81a and 81b behind them in the vehicle width direction. In this embodiment, a downwardly recessed portion is formed between the upper first ridge 81a and the upper first ridge 82a behind it, and an upwardly protruding portion is formed between the lower first ridge 82b and the lower first ridge 81b behind it.

[0073] In the side wall portion 12, the reinforcing rib portion 80 has multiple second ridges arranged in the front-rear direction, including second ridges 84a and 84b with odd numbers counting from the front and second ridges 85a and 85b with even numbers counting from the front. In addition, the reinforcing rib portion 80 has front and rear ridges 86a and 86b.

[0074] The second ridge lines 84a and 84b of the odd-numbered group extend upward from the boundary portion with the lower wall portion 13. The lower end of the second ridge line 84a, located on the outer side in the vehicle width direction, connects to the inner end of the first ridge line 81a in the vehicle width direction. The lower end of the second ridge line 84b, located on the inner side in the vehicle width direction, connects to the inner end of the first ridge line 81b in the vehicle width direction. The second ridge lines 85a and 85b of the even-numbered group extend upward from the boundary portion with the lower wall portion 13. The lower end of the second ridge line 85a, located on the outer side in the vehicle width direction, connects to the inner end of the first ridge line 82a in the vehicle width direction. The lower end of the second ridge line 85b, located on the inner side in the vehicle width direction, connects to the inner end of the first ridge line 82b in the vehicle width direction.

[0075] The front and rear ridges 86a and 86b connect the outer ends of a second ridge 84a and 84b in the vehicle width direction to the outer ends of the second ridges 85a and 85b behind it in the vehicle width direction. In this embodiment, a recessed portion is formed between the second ridge 83a located on the outer side in the vehicle width direction and the second ridge 84a located on the outer side in the vehicle width direction behind it, and a protruding portion is formed between the second ridge 83b located on the inner side in the vehicle width direction and the second ridge 84b located on the inner side in the vehicle width direction behind it, protruding portion is formed on the outer side in the vehicle width direction.

[0076] In the floor section of the vehicle compartment, stress input from the subframe 4 sometimes concentrates near the passageway. This stress in the vicinity of the passageway acts in a way that causes the floor section to twist (load in the twisting direction), raising concerns about causing distortion and deformation (fracture, etc.) of the floor section.

[0077] In contrast, the vehicle floor structure 1 of the present invention includes: a floor portion (lower wall portion 13 and main body portion 21) erected between a pair of lower longitudinal beams 3, 3 in the vehicle width direction; and a channel portion (upper wall portion 11 and side wall portions 12, 12) extending in the front-rear direction and convex upward at the middle portion in the vehicle width direction of the floor portion. Multiple first ridge lines 81a, 81b, 82a, 82b are formed in the floor portion extending in the vehicle width direction from the boundary portion with the channel portion. The multiple first ridge lines 81a, 81b, 82a, 82b are inclined in a forward manner as they tend to the outer side in the vehicle width direction.

[0078] Therefore, in the vehicle body floor structure 1, the first ridges 81a, 81b, 82a, and 82b are in the direction of distortion with the floor portion (refer to...). Figure 2 The thick line X extends in the direction of intersection (preferably, orthogonal direction), thus dispersing the stress (torsional load) concentrated near the channel to the first ridges 81a, 81b, 82a, 82b, thereby improving the rigidity relative to the stress and properly preventing the distortion and deformation (breakage, etc.) of the floor section.

[0079] In the vehicle floor structure 1, the passage portion has a pair of sidewall portions 12, 12 extending upward from the floor portion in the vehicle width direction, and an upper wall portion 11 connecting the upper ends of the pair of sidewall portions 12, 12 in the vehicle width direction to each other. Multiple second ridges 84a, 84b, 85a, 85b are formed on the sidewall portions 12, which are connected to the first ridges 81a, 81b, 82a, 82b and extend in the vertical direction.

[0080] Therefore, in the vehicle floor structure 1, the stress acting on the first ridges 81a, 81b, 82a, 82b can be transferred to the second ridges 84a, 84b, 85a, 85b that are continuous with the first ridges 81a, 81b, 82a, 82b and dispersed to the side wall portion 12, which can more properly prevent the distortion and deformation of the floor portion.

[0081] In the vehicle floor structure 1, multiple first ridge lines 81a, 81b, 82a, 82b and multiple second ridge lines 84a, 84b, 85a, 85b are formed by reinforcing ribs 80 spanning the floor portion and the passage portion.

[0082] Therefore, the vehicle floor structure 1 can be formed by simple processing to create continuous first ridges 81a, 81b, 82a, 82b and second ridges 84a, 84b, 85a, 85b, and the pair of first ridges 81a, 81b and second ridges 84a, 84b (and first ridges 82a, 82b and second ridges 85a, 85b) formed by the reinforcing ribs 80 are arranged close together, so that the stress concentrated near the passage can be more properly dispersed.

[0083] In the vehicle body floor structure 1, a subframe 4 is connected to the floor portion and is positioned forward compared to the passage portion. Multiple first ridge lines 81a, 81b, 82a, 82b and multiple second ridge lines 84a, 84b, 85a, 85b are arranged on the inner side in the vehicle width direction compared to the connection portion (connection portion 60a) between the floor portion and the subframe 4.

[0084] Therefore, the vehicle floor structure 1 can transmit the stress generated by the load input from the subframe 4 to the floor via the connection part to the second ridges 84a, 84b, 85a, 85b that are continuous with the first ridges 81a, 81b, 82a, 82b and disperse it to the side wall 12, thereby more properly preventing the floor from warping and deforming.

[0085] The vehicle floor structure 1 has a floor frame 60 extending in the front-rear direction between the passage portion in the floor section and the lower longitudinal beam 3. The subframe 4 is connected to the floor frame 60 via an extension member 70. Multiple first ridge lines 81a, 81b, 82a, 82b and multiple second ridge lines 84a, 84b, 85a, 85b are arranged on the inside side in the vehicle width direction compared to the connection portion (connection portion 60a) between the floor frame 60 and the extension member 70.

[0086] Therefore, the vehicle floor structure 1 can disperse the stress acting between the floor frame 60 and the passage portion, and transmit it to the side wall portion 12 for dispersion, thus more properly preventing the distortion and deformation of the floor portion.

[0087] In the vehicle floor structure 1, the vertical height of the passage section from the floor section is set such that it decreases towards the rear.

[0088] Therefore, the vehicle floor structure 1 can suppress perimeter differences, wrinkles, and distortions of the passageway that occur during the manufacturing stage by means of the reinforcing ribs 80, thereby reducing the rigidity deviation of the vehicle floor (panel section and passageway section).

[0089] The vehicle floor structure 1 has a floor beam 30 extending outward from the passage section in the vehicle width direction, and multiple first ridges 81a, 81b, 82a, 82b and multiple second ridges 84a, 84b, 85a, 85b are located in front of the floor beam 30.

[0090] Therefore, the vehicle floor structure 1 can properly cope with both the distortion and deformation caused by the twisting of the panel section and the side impact load.

[0091] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and can be appropriately modified without departing from the spirit of the present invention. For example, the number, configuration angle, configuration interval, etc. of the first ridge lines 81a, 81b, 82a, and 82b can be appropriately set according to the vehicle model.

Claims

1. A vehicle body floor structure, characterized in that, have: The floor section erected between a pair of lower longitudinal beams in the vehicle width direction; and The passageway extending in the front-to-back direction and convex upward at the middle of the width direction of the floor section. Multiple first ridge lines extending along the vehicle width direction from the boundary between the floor portion and the passage portion are formed thereon. The first ridge lines slope forward as they move outward in the vehicle width direction. The channel portion has: A pair of sidewall portions extending upward from the floor portion in the vehicle width direction; and The upper wall portion that connects the upper ends of a pair of side wall portions in the vehicle width direction. Multiple second ridges are formed on the side wall portion, which are connected to the first ridge and extend in the vertical direction. A subframe, positioned forward compared to the passageway, is connected to the floor section. The plurality of first ridge lines and the plurality of second ridge lines are positioned inside the vehicle width direction relative to the connection portion between the floor portion and the subframe. Between the passageway and the lower longitudinal beam in the floor section, there is a floor frame extending in the front-to-back direction. The subframe is connected to the floor frame via an extension member. The first ridge line and the second ridge line are arranged inside the vehicle width direction compared to the connection between the floor frame and the extension member.

2. The vehicle floor structure according to claim 1, characterized in that, Multiple first ridge lines and multiple second ridge lines are formed by reinforcing ribs spanning the floor portion and the channel portion.

3. The vehicle floor structure according to claim 2, characterized in that, The vertical height of the passage section from the floor section is set such that it decreases as it moves towards the rear.

4. The vehicle floor structure according to claim 2, characterized in that, It has a floor beam extending outward from the passageway in the vehicle width direction. Multiple first ridge lines and multiple second ridge lines are positioned in front of the floor beam.

Images