JP6974512B2 - Vehicle floor structure - Google Patents

Description

The present invention relates to a floor structure of a vehicle such as an electric vehicle or a hybrid vehicle in which a driving battery is arranged under the floor.

In electric vehicles and hybrid vehicles in which the battery is placed under the floor, in order to protect the battery against a side collision (side collision), for example, the ends of the cross members constituting the automobile body are easily crushed, or the ends of the cross members are easily crushed. Countermeasures against side collisions such as increasing the cross section of the end of the cross member are taken.

For example, Patent Document 1 discloses a structure in which the end portion of a cross member provided straddling the left and right side sills in the vehicle width direction is widened and the cross section of the end portion is increased to increase the amount of side collision energy absorbed. ing.

Japanese Patent No. 4858183

However, in the side collision absorption structure disclosed in Patent Document 1, the cross-sectional area of the end portion of the cross member along the vehicle width direction is large, while the cross-sectional area of the central portion of the cross member is the cross-sectional area of the end portion. It becomes smaller than.

Therefore, in the side collision absorption structure disclosed in Patent Document 1, when the side collision load is input, an area difference in the cross section occurs in the portion of the cross member provided across the left and right side sills in the vehicle width direction, and this cross section There is a risk that the rigidity and strength of the cross member along the vehicle width direction will be unbalanced due to the difference in area.

The present invention has been made in view of the above points, and provides a vehicle floor structure capable of balancing rigidity and strength along the vehicle width direction of a cross member when a lateral impact load is input. With the goal.

In order to achieve the above object, the present invention is a floor structure of a vehicle having a battery case in which a battery is housed, and a pair of left and right vehicles arranged outside in the vehicle width direction and extending along the vehicle front-rear direction. Side sill, a floor panel arranged across the inside of each side sill in the vehicle width direction, a seat mount bracket having a cross-sectional box shape and fixed via an inner fixing portion and an outer fixing portion, and a pair of left and right sides. The cross member includes a cross member that connects the side sills along the vehicle width direction, and the cross member includes a cross member on the panel arranged on the floor panel and a cross member under the panel arranged under the floor panel. The lower panel cross member has an inclined portion that is inclined so as to stand downward toward the outer side in the vehicle width direction, and the outer end portion of the cross member under the panel in the vehicle width direction outside the inclined portion is , The end center line of the panel lower cross member is connected to the side sill at a position below the center of the cross section of the side sill, and the inner fixing portion is the cross on the panel located outside the vehicle width direction of the inclined portion. It is coupled to the upper surface of the member, the outer fixing portion being coupled to the inner upper wall of the side sill.

In the present invention, it is possible to obtain a vehicle floor structure capable of balancing the rigidity and strength of the cross member along the vehicle width direction when the lateral thrust load is input.

It is a bottom view which looked at the vehicle to which the floor structure which concerns on embodiment of this invention was applied from the lower side. FIG. 1 is a bottom view showing a state in which the battery case is removed. It is a top view of the vehicle shown in FIG. 1 as seen from the upper side of the floor panel. FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. It is sectional drawing along the VV line of FIG. FIG. 5 is a partially enlarged cross-sectional view of FIG. 5 including a side sill. (A) is an enlarged plan view of the seat mount bracket, (b) is an enlarged plan view showing a state in which the seat mount bracket is removed from the state shown in (a), and (c) is an enlarged side view of the seat mount bracket. , (D) is a cross-sectional view taken along the line VII-VII of (c). (A) is a partially enlarged cross-sectional view showing a state at the time of inputting a lateral impact load, and (b) is a partially enlarged sectional view showing a state in which a lateral impact load is further input from the state of (a). ..

Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In each figure, "front and rear" indicates the vehicle front and rear direction, "left and right" indicates the vehicle width direction (left and right direction), and "up and down" indicates the vehicle vertical direction (vertical vertical direction).

The floor structure according to the embodiment of the present invention is applied to, for example, a vehicle 10 including an electric vehicle, a hybrid vehicle, a fuel cell vehicle, and the like. The vehicle 10 includes a high-voltage battery (not shown), an electric motor (driving motor), and electric equipment such as a PDU (Power Drive Unit) that controls the electric power from the battery and supplies the electric power to the electric motor.

First, the structure under the panel of the vehicle 10 will be described, and then the structure on the panel will be described in detail.

As shown in FIG. 1, the vehicle 10 is arranged on the outside in the vehicle width direction, and is arranged so as to straddle a pair of left and right side sills 12 and 12 extending along the vehicle front-rear direction and the inside of each side sill 12 in the vehicle width direction. A floor panel 14 is provided, a battery case 18 arranged under the panel of the floor panel 14 and a battery is housed in the chamber 16, and a cross member arranged along the vehicle width direction. As shown in FIGS. 4 and 5, an undercover 19 that covers and protects the lower surface of the battery case 18 is arranged on the lower side of the battery case 18. The undercover 19 is attached to the lower surface of each side sill 12 and the battery case 18 via a plurality of bolts.

The cross member is composed of a cross member on the panel arranged on the panel and a cross member under the panel arranged under the panel. Here, the cross member under the panel will be described in detail, and the cross member on the panel will be described in detail in the structure on the panel of the vehicle described later.

As shown in FIGS. 1 and 2, under the floor of the vehicle, a pair of left and right front side frames 20 and 20 extending toward the front of the vehicle are connected to the rear end of each front side frame 20 of the vehicle. A pair of left and right panel lower side frames 22 and 22 extending along the front-rear direction and a pair of left and right panel lower floor frames 24 and 24 connected to the rear end of each panel lower side frame 22 and extending along the front-rear direction of the vehicle. It has a pair of left and right tunnel frames 26, 26 which are arranged between the panel lower side frames 22 along the vehicle width direction and extend substantially parallel to the vehicle front-rear direction. The vehicle rear end of each panel lower floor frame 24 is connected to a panel lower middle cross member 34 described later via a gusset 28.

Further, a cross member under the panel is arranged under the floor of the vehicle 10. As shown in FIG. 2, the panel lower cross member includes a panel lower front cross member 30 extending along the vehicle width direction, a panel lower center cross member 32 extending along the vehicle width direction, and a vehicle width direction. It has a middle cross member 34 under the panel extending in the direction of the panel. The front cross member 30 under the panel and the center cross member 32 under the panel each have a substantially hat-shaped cross section on the axis.

The center cross member 32 under the panel is configured to extend in a substantially constant cross section along the vehicle width direction. Further, in the panel lower center cross member 32, the outer end portions 32a in the vehicle width direction on both the left and right sides are joined to the inner lower wall 13c described later of each side sill 12, so that the pair of left and right side sill 12 and 12 are joined in the vehicle width direction. (See FIGS. 2 and 6). Further, the panel lower center cross member 32 is provided with an inclined portion 36 that is inclined so as to fall downward on the outside in the vehicle width direction (see FIGS. 5 and 6 described later).

On the outer side of the inclined portion 36, the outer end portion 32a of the panel lower center cross member 32 in the vehicle width direction has the end center line C1 of the panel lower center cross member 32 passing through the inclined portion 36 and the cross-sectional center C2 of the side sill 12. It is coupled to the side sill 12 at a lower position (see FIG. 6).

As shown in FIG. 2, the panel lower front cross member 30 is located in front of the vehicle from the panel lower center cross member 32, and has a pair of left and right outriggers 38 and 38 connected to each side sill 12 and a pair of left and right panels. It has a connecting frame 40 that connects the rear ends of the lower tunnel frames 26, 26 to each other along the vehicle width direction. The lower panel middle cross member 34 is located behind the vehicle with respect to the lower panel center cross member 32, and connects a pair of left and right side sills 12, 12 along the vehicle width direction. The outriggers 38 and the connecting frame 40 are separated from each other and are arranged apart from each other along the vehicle width direction.

As shown in FIG. 6, a recessed portion 42 that is recessed toward the vehicle upward when viewed from the side is provided on the lower surface of the panel lower center cross member 32. The recessed portion 42 extends along the vehicle front-rear direction on the lower surface of the panel lower center cross member 32 when viewed from the vehicle bottom surface side.

Further, the center cross member 32 under the panel is covered with the stiffener (reinforcing member) 43 from the vicinity of the central portion in the vehicle width direction to the front of the outer end portion 36a in the vehicle width direction of the inclined portion 36 on the outer side in the vehicle width direction (see FIG. 5). ), A part of the center cross member 32 under the panel is reinforced. The stiffeners 43 are provided on both the left and right sides of the center cross member 32 under the panel with the central portion in the vehicle width direction in between.

As a result, the rigidity / strength of the center cross member 32 under the panel from the central portion in the vehicle width direction to the inclined portion 36 on the outer side in the vehicle width direction is higher than the rigidity / strength of the outer end portion 36a in the vehicle width direction of the inclined portion 36. ing. Furthermore, the under-floor mounting component including at least the battery housed in the room of the battery case 18 is fixed to the center cross member 32 under the panel.

In this embodiment, the stiffener 43 is used to reinforce a part of the center cross member 32 under the panel, but the present invention is not limited to this. For example, a part of the center cross member 32 under the panel covered with the stiffener 43 may be made of a high-strength steel plate.

As shown in FIGS. 4 and 5, the battery case 18 includes an upper case 46 and a lower case 48, and has an internally sealed chamber 16. A plurality of batteries and the like, which are driving energy sources for electric motors, are housed in the chamber 16 of the battery case 18. The central portion of the battery case 18 along the vehicle front-rear direction and the outer both ends along the vehicle width direction are the center cross member 32 under the panel and the pair of left and right floor frames 24, 24 under the panel via a plurality of bolts B. It is fastened and fixed to each of them (see FIG. 1).

That is, a pair of bolt insertion holes formed of through holes penetrating along the vertical direction of the battery case 18 are formed in the central portion of the battery case 18 along the vehicle front-rear direction. Further, a pair of mounting holes are provided in the central portion of the center cross member 32 under the panel along the vehicle front-rear direction along the vehicle width direction. By inserting the bolt B into each bolt insertion hole and fastening the screw portion of the bolt B to the mounting hole, the central portion of the battery case 18 is fastened and fixed to the center cross member 32 under the panel.

Further, a pair of bolt insertion holes separated from each other along the vehicle front-rear direction are formed at both left and right ends of the battery case 18 along the vehicle width direction, and a plurality of bolts B inserted into the respective bolt insertion holes are formed. By fastening to the mounting holes formed in the lower floor frame 24 of each panel, the left and right ends of the battery case 18 are fastened and fixed to the lower floor frame 24 of each panel.

Next, the structure on the panel will be described in detail.
As shown in FIG. 3, on the panel of the vehicle 10, a pair of left and right panel top side frames 50, 50, a pair of left and right panel top floor frames 52, 52, and a pair of left and right panel top tunnel frames 54, 54. And are arranged respectively. The pair of left and right panel upper side frames 50, 50 are connected to the vehicle rear end of each front side frame 20 and extend along the vehicle front-rear direction. The pair of left and right panel upper floor frames 52 are connected to the vehicle rear end portion of each panel upper side frame 50 extending along the vehicle front-rear direction, and extend along the vehicle front-rear direction. The pair of left and right panel upper tunnel frames 54 are arranged between the panel upper side frames 50 along the vehicle width direction, and extend substantially parallel to the vehicle front-rear direction. The rear end of the floor frame 52 on each panel is stopped in front of the middle cross member 56 on the panel located at the rear of the vehicle.

Further, on the floor of the vehicle 10, a front cross member 58 on the panel extending along the vehicle width direction, a center cross member 60 on the panel extending along the vehicle width direction, and a middle panel on the panel extending along the vehicle width direction. It has a cross member 56. The front cross member 58 on each panel and the center cross member 60 on each panel are separated at the central portion of the floor panel 14, and are separated on the left and right sides along the vehicle width direction. The center cross member 60 on the panel and the center cross member 32 on the bottom of the panel are arranged at positions where they overlap each other in the vertical direction of the vehicle.

The upper surface of the center cross member 60 on the panel is composed of a substantially flat surface 61 along the vehicle width direction (see FIGS. 7 (b) and 7 (d)). The substantially flat surface 61 is located below the seat mount bracket 62, which will be described later, and has a first bead-shaped portion 64 extending along the vehicle front-rear direction.

That is, the first bead shape portion 64 is located below the upper wall 62a of the seat mount bracket 62, which will be described later, and is recessed from the upper surface (substantially flat surface 61) of the center cross member 60 on the panel toward the lower side of the vehicle. It is composed of a linear groove portion 66 (see FIGS. 7 (b) and 7 (d)). The plurality of groove portions 66 extend substantially in parallel along the vehicle front-rear direction (the axial direction of the center cross member 60 on the panel).

As shown in FIG. 5, the panel lower center cross member 32 has a convex portion 70 projecting upward along the lower surface of the tunnel portion 68. The center cross member 60 on the panel is joined to the tunnel portion 68 via the seat mount bracket 62 located inside. The center cross member 60 on the panel has a substantially constant cross section extending along the vehicle width direction along the upper surface of the floor panel 14. The center cross member 60 on the panel is joined to the inner side wall 13b of the side sill 12 (side sill inner) via the joining flange (see FIG. 6).

A plurality of seat mount brackets 62 for fixing the legs of the left and right front seats are fixed to the front cross member 58 on the panel and the center cross member 60 on the panel, which are spaced apart from each other on both the left and right sides in the vehicle width direction. (See Fig. 3). The pair of front legs and the pair of rear legs of each seat consisting of the left front seat and the right front seat are fixed to the front cross member 58 on the panel and the center cross member 60 on the panel via the seat mount bracket 62, respectively. There is.

That is, in the left front seat, the left front leg portion arranged on the left side sill 12 side and the right front leg portion arranged on the tunnel frame 54 side on the left panel are on the left panel via the seat mount bracket 62. It is fixed to each of the front cross members 58. Further, in the left front seat, the right front leg portion arranged on the right side sill 12 side and the left front leg portion arranged on the tunnel frame 54 side on the right panel are on the right panel via the seat mount bracket 62. It is fixed to each of the front cross members 58.

Further, in the left front seat, the left rear leg portion arranged on the left side sill 12 side and the left rear leg portion arranged on the tunnel frame 54 side on the left panel are on the right side via the seat mount bracket 62. It is fixed to each of the center cross members 60 on the panel. Further, the right hind leg portion arranged on the right side sill 12 side and the left hind leg portion arranged on the tunnel frame 54 side on the left panel are connected to the center cross member 60 on the right panel via the seat mount bracket 62. It is fixed to each.

In the same manner as the left front seat, in the right front seat, the front legs and the rear legs are fixed to the front cross member 58 on the right panel and the center cross member 60 on the right panel via a plurality of seat mount brackets 62, respectively. Has been done.

As shown in FIG. 7, the seat mount bracket 62 has a cross-sectional box shape and is composed of an upper wall 62a, an inner side wall 62b, a front wall 62c, and a rear wall 62d for fixing each seat. A closed cross section is formed.

The upper wall 62a is a flat portion 63a formed of a flat surface along a substantially horizontal direction, and an inclined surface that descends from the outer end portion of the flat portion 63a in the vehicle width direction toward the inner upper wall 13a of the side sill 12 (side sill inner). It has an inclined portion 63b made of (see FIG. 7D). The inner side wall 62b is arranged inside in the vehicle width direction facing the inner side wall 13b of the side sill 12 (side sill inner), and a second bead-shaped portion 72 extending linearly along the vehicle vertical direction is provided in the center thereof. (See Fig. 7b). The second bead-shaped portion 72 is composed of a linear recess that is recessed toward the side sill 12 (side sill inner) side on the outer side in the vehicle width direction.

Further, at the lower end of the inner side wall 62b, a fastening flange 74 that is continuous with the lower end of the second bead shape portion 72 and protrudes inward in the vehicle width direction is provided (FIGS. 7 (a) and 7 (FIG. 7). c) See). The fastening flange 74 is provided with a mounting hole that penetrates in the vertical direction. The fastening flange 74 functions as an inner fixing portion to be described later, and the fastening flange 74 is fastened and fixed to the upper surface of the center cross member 60 on the panel via a bolt B inserted into the mounting hole.

The front wall 62c is located in front of the vehicle of the seat mount bracket 62, and the rear wall 62d is located behind the vehicle of the seat mount bracket 62 (see FIG. 7A). Joint flanges 76 joined to the inner side wall 13b of the side sill 12 (side sill inner 12b) are provided at the outer end portions of the front wall 62c and the rear wall 62d in the vehicle width direction (see FIG. 7A). In the present embodiment, the joint flange 76 that functions as the outer fixing portion 80 is provided on the upper wall 62a, the front wall 62c, and the rear wall 62d, respectively, but the present invention is not limited to this, and at least, the joint flange 76 is provided. It may be provided on the upper wall 62a.

The seat mount bracket 62 has an inner fixing portion 78 arranged inside in the vehicle width direction and an outer fixing portion 80 arranged outside in the vehicle width direction, via the inner fixing portion 78 and the outer fixing portion 80. It is fixed to the vehicle body side member.

The inner fixing portion 78 has a fastening flange 74 provided at the lower end of the second bead shape portion 72, and the fastening flange 74 is fastened and fixed to the upper surface of the center cross member 60 on the panel by bolts B. The outer fixing portion 80 has a pair of joining flanges 76, 76 protruding outward from the outer end portion in the vehicle width direction of the upper wall 62a, and the pair of joining flanges 76, 76 is a side sill 12 (side sill innerr). It is joined to the inner upper wall 13a of 12b).

Each side sill 12 is arranged on both the left and right sides along the vehicle width direction, and extends along the vehicle front-rear direction. As shown in FIG. 6, each side sill 12 is provided between the side sill outer 12a arranged outside in the vehicle width direction, the side sill inner 12b arranged inside in the vehicle width direction, and between the side sill outer 12a and the side sill inner 12b. It has an intervened side silstifna 12c. The lower end portion 82a of the center pillar 82 extending along the vertical direction of the vehicle is fixed to the side sill outer 12a.

The side sill inner 12b has a cross-sectional hat shape, and is arranged to face the inner upper wall 13a located on the upper side, the inner side wall 13b continuous with the lower end of the inner upper wall 13a and facing the seat mount bracket 62, and the inner upper wall 13a. It has an inner lower wall 13c continuous with the lower end of the inner side wall 13b.

The side sill outer 12a has a cross-sectional hat shape, is arranged facing the outer upper wall 15a located on the upper side, the outer side wall 15b continuous with the lower end of the outer upper wall 15a, and the outer upper wall 15a, and is arranged at the lower end of the outer side wall 15b. It has a continuous outer lower wall 15c. A lower end portion 82a of the center pillar 82 is joined to the upper surface of the outer upper wall 15a.

The vehicle 10 to which the floor structure according to the present embodiment is applied is basically configured as described above, and the effects thereof will be described next.

In the present embodiment, a cross member connecting a pair of left and right side sills 12 and 12 along the vehicle width direction is provided, and the cross member includes a center cross member 60 on a panel arranged on the floor panel 14 and a floor panel 14. It has a panel lower center cross member 32 arranged below. The panel lower center cross member 32 has an inclined portion 36 that is inclined so as to fall downward toward the outside in the vehicle width direction. The outer end portion 32a of the panel lower center cross member 32 in the vehicle width direction is provided on the side sill 12 at a position where the end center line C1 of the panel lower center cross member 32 passes through the inclined portion 36 and is lower than the cross-sectional center C2 of the side sill 12. It is joined (see FIG. 6). In the seat mount bracket 62, the inner fixing portion 78 is fastened and fixed to the upper surface of the center cross member 60 on the panel located outside in the vehicle width direction of the inclined portion 36 via the fastening flange 74. The outer fixing portion 80 is joined to the inner upper wall 13a of the side sill 12 via the joining flange 76.

In the present embodiment, on the lower side of the center cross member 32 under the panel, a large in-vehicle component vulnerable to a side collision load such as a drive battery is housed in a portion inside the inclined portion 36 in the vehicle width direction. The battery case 18 can be arranged.

Further, in the present embodiment, when the lateral thrust load F is input from the side sill 12 side, the end center line C1 of the panel lower center cross member 32 is joined at a position lower than the cross-sectional center C2 of the side sill 12. (See FIG. 6), a rotational force in the counterclockwise direction (see arrow A1 in FIG. 8A) is generated with respect to the left side of the side sill 12 when viewed from the front of the vehicle. The rotational force generated in the side sill 12 in the counterclockwise direction is transmitted to the seat mount bracket 62 having a box-shaped cross section via the side sill inner 12b. As a result, the seat mount bracket 62 having a box-shaped cross section rotates in the counterclockwise direction (see arrow A2 in FIG. 8B). As a result, in the present embodiment, the center cross member 32 under the panel is bent and deformed starting from the outer end portion 36a in the vehicle width direction of the inclined portion 36, whereby the side impact load F input to the side sill 12 side is preferably applied. Can be absorbed. Therefore, in the present embodiment, even when the side impact load F is input, the rigidity and strength of the cross member including the center cross member 32 under the panel can be balanced along the vehicle width direction. A floor structure can be obtained.

Further, in the present embodiment, the lower surface of the panel lower center cross member 32 has a recessed portion 42 that is recessed toward the vehicle upward when viewed from the side (see FIG. 6). By providing the recessed portion 42 on the lower surface of the center cross member 32 under the panel, the rotational force in the counterclockwise direction of the side sill 12 and the rotational force in the counterclockwise direction of the seat mount bracket 62 having a box-shaped cross section are obtained from each. It can be further increased. As a result, in the present embodiment, in order to increase the rigidity / strength of the floor panel 14, even when the rigidity / strength of the side sill joint end portion of the center cross member 32 under the panel is increased, the side impact load F is input. Occasionally, the lateral impact load F can be easily absorbed by easily bending and deforming the outer end portion 36a of the inclined portion 36 in the vehicle width direction.

Further, in the present embodiment, the center cross member 32 under the panel is covered with the stiffener (reinforcing member) 43 from the vicinity of the central portion in the vehicle width direction to the front of the outer end portion 36a in the vehicle width direction of the inclined portion 36 on the outer side in the vehicle width direction. The center cross member 32 under the panel is partially reinforced. As a result, in the present embodiment, the rigidity and strength of the center cross member 32 under the panel from the central portion side in the vehicle width direction to the inclined portion 36 on the outer side in the vehicle width direction is the rigidity of the outer end portion 36a in the vehicle width direction of the inclined portion 36.・ It is higher than the strength. As a result, in the present embodiment, the rigidity / strength of the outer end portion 36a in the vehicle width direction of the inclined portion 36 is lower than that of the portion covered with the stiffener 43, so that the rotational force of the seat mount bracket 62 The center cross member 32 under the panel can be easily bent and deformed. In the present embodiment, the stiffness difference / strength difference is provided by using the stiffener 43 made of the reinforcing member, but for example, a high-strength steel plate or the like may be used to generate the rigidity difference / strength difference.

Furthermore, in the present embodiment, the upper surface of the center cross member 60 on the panel is composed of 61 flat surfaces along the vehicle width direction, and the flat surface 61 is located below the seat mount bracket 62 and is located along the vehicle front-rear direction. A first bead shape portion 64 is provided (see FIG. 6). In the present embodiment, the first bead shape portion 64 is crushed along the vehicle width direction when the lateral impact load F is input, so that the rotational force of the seat mount bracket 62 in the counterclockwise direction is not hindered and the lateral impact load F is not hindered. Can contribute to the absorption of.

Furthermore, in the present embodiment, the seat mount bracket 62 is composed of an upper wall 62a for fixing each seat, an inner side wall 62b, a front wall 62c, and a rear wall 62d (see FIG. 7). The inner side wall 62b has a second bead-shaped portion 72 extending in the vertical direction of the vehicle, and the inner fixing portion 78 is provided at the lower end of the second bead-shaped portion 72. In the present embodiment, the seat mount bracket 62 is composed of the upper wall 62a, the inner side wall 62b, the front wall 62c, and the rear wall 62d, so that the rigidity and strength of the cross-sectional box shape can be increased. Further, in the present embodiment, by providing the second bead shape portion 72, the rigidity of the seat mount bracket 62 in the vertical direction is increased, and when the lateral thrust load F is input, the outer end portion 36a of the inclined portion 36 in the vehicle width direction is provided. , Can be bent and deformed more easily.

Furthermore, in the present embodiment, the outer fixing portion 80 of the seat mount bracket 62 is composed of a joining flange 76 projecting outward from the vehicle width direction end portion of the upper wall 62a. Thereby, in the present embodiment, the box-shaped cross section composed of the upper wall 62a, the inner side wall 62b, the front wall 62c, and the rear wall 62d, the inner side wall 13b of the side sill 12, and the upper surface of the center cross member 60 on the panel. It is possible to form a closed cross section and improve the seat support strength. In the present embodiment, the front wall 62c and the rear wall 62d are also provided with the joining flanges 76 and 76 extending to the side sill 12 side, respectively, and the joining flanges 76 and 76 are joined to the inner side wall 13b of the side sill 12, respectively. Therefore, the seat support strength can be further improved.

Furthermore, in the present embodiment, the center cross member 60 on the panel and the center cross member 32 below the panel are arranged so as to overlap each other in the vertical direction of the vehicle. Thereby, in the present embodiment, the cross-sectional thickness dimension of the center cross member 32 below the panel can be reduced by the cross-sectional thickness dimension of the center cross member 60 on the panel. As a result, in the present embodiment, the floor-mounted parts such as the battery housed in the battery case 18 are provided while ensuring the minimum ground clearance between the undercover 19 arranged on the lower side of the battery case 18 and the ground. It can be made larger.

Furthermore, in the present embodiment, at least the underfloor mounting component including the battery is fixed to the center cross member 32 under the panel via the battery case 18. Thereby, in the present embodiment, it is possible to suppress the vibration of the underfloor-mounted parts such as the battery housed in the battery case 18 when the vehicle is running.

Furthermore, in the present embodiment, the panel lower center cross member 32 has a convex portion 70 projecting upward along the lower surface of the tunnel portion 68, and the panel upper center cross member 60 is an inner seat mount bracket. It is joined to the tunnel portion 68 via 62 (see FIG. 5). In the present embodiment, even when the tunnel portion 68 is provided on the floor panel 14, the side impact load F input from the side sill 12 is applied to the lower center cross member 32 and the upper panel arranged above and below the floor panel 14. By absorbing by both the center cross members 60, the battery arranged under the panel can be reliably protected.

Furthermore, in the present embodiment, the panel lower center cross member 32 has a substantially constant cross section extending along the vehicle width direction along the lower surface of the floor panel 14, and the panel lower center cross member 32 has an inclined portion 36. It is fixed to the inner lower wall 13c of the side sill 12 (side sill inner 12b) via the side sill 12 (side sill inner 12b). As a result, in the present embodiment, even when the inclined portion 36 is provided on the lower center cross member 32 of the panel, the lateral thrust load F is absorbed by the lower center cross member 32 of the panel, so that the load F is arranged under the panel. The battery can be protected even more reliably.

10 Vehicle 12 Side sill 12a Side sill Outer 13a Inner upper wall 13c Inner lower wall 14 Floor panel 16 Room 18 Battery case 32 Panel lower center cross member 32a (of panel lower center cross member) Vehicle width direction outer end 36 Inclined part 36a (Inclined) Outrigger 42 Outrigger 42 Depressed shape 43 Stiffener 60 Panel top center cross member 61 Flat surface 62 Seat mount bracket 62a Top wall 62b Inner side wall 62c Front wall 62d Rear wall 64 First bead shape part 68 Tunnel Part 70 Convex part 72 Second bead shape part 74 Fastening flange 76 Joint flange 78 Inner fixing part 80 Outer fixing part 82 Center pillar 82a (Center pillar) Lower end C1 End center line C2 Cross-section center F Side thrust load

Claims (10)

It is a floor structure of a vehicle having a battery case in which a battery is stored.
A pair of left and right side sills that are placed on the outside in the vehicle width direction and extend along the vehicle front-rear direction,
Floor panels arranged across the inside of each side sill in the vehicle width direction,
A seat mount bracket that has a cross-sectional box shape and is fixed via the inner fixing part and the outer fixing part.
A cross member that connects the pair of left and right side sills along the vehicle width direction,
Equipped with
The cross member has a cross member on the panel arranged on the floor panel and a cross member under the panel arranged under the floor panel.
The panel lower cross member has an inclined portion inclined so as to fall downward toward the outside in the vehicle width direction.
The outer end portion of the panel lower cross member on the outside of the inclined portion in the vehicle width direction is coupled to the side sill at a position where the end center line of the panel lower cross member is below the cross-sectional center of the side sill.
The inner fixing portion is coupled to the upper surface of the cross member on the panel located outside the inclined portion in the vehicle width direction.
The floor structure of the vehicle, wherein the outer fixing portion is coupled to the inner upper wall of the side sill. In the floor structure of the vehicle according to claim 1,
The floor structure of a vehicle, characterized in that the lower surface of the cross member under the panel has a recessed portion that is recessed toward the vehicle upward when viewed from the side. In the floor structure of the vehicle according to claim 1 or 2.
The rigidity / strength of the cross member under the panel from the central portion side in the vehicle width direction to the inclined portion on the outer side in the vehicle width direction is higher than the rigidity / strength of the outer end portion in the vehicle width direction of the inclined portion. Vehicle floor structure. In the floor structure of the vehicle according to any one of claims 1 to 3.
The upper surface of the cross member on the panel is a flat surface along the vehicle width direction.
The flat surface is a vehicle floor structure that is located below the seat mount bracket and has a first bead-shaped portion that extends along the vehicle front-rear direction. In the floor structure of the vehicle according to any one of claims 1 to 4.
The seat mount bracket has an upper wall, an inner side wall, a front wall, and a rear wall for fixing the seat.
The inner side wall has a second bead-shaped portion extending in the vertical direction of the vehicle.
The inner fixing portion is a floor structure of a vehicle, characterized in that the inner fixing portion is provided at the lower end of the second bead shape portion. In the floor structure of the vehicle according to claim 5.
The outer fixing portion is a floor structure of a vehicle, characterized in that the outer fixing portion is a joint flange protruding outward from an end portion in the vehicle width direction of the upper wall. In the floor structure of the vehicle according to any one of claims 1 to 6.
The floor structure of the vehicle, wherein the cross member on the panel and the cross member on the bottom of the panel are arranged so as to be overlapped with each other in the vertical direction of the vehicle. In the floor structure of the vehicle according to any one of claims 1 to 7.
The floor structure of a vehicle, characterized in that, at least the underfloor mounting component including a battery is fixed to the cross member under the panel via the battery case. In the vehicle floor structure according to any one of claims 1 to 8.
The lower panel cross member has a convex portion that projects upward along the lower surface of the tunnel portion.
A vehicle floor structure characterized in that the cross member on the panel is coupled to the tunnel portion via the inner seat mount bracket. In the floor structure of the vehicle according to any one of claims 1 to 9.
The lower panel cross member has a substantially constant cross section extending along the vehicle width direction along the lower surface of the floor panel.
The floor structure of the vehicle, wherein the cross member under the panel is fixed to the inner lower wall of the side sill via the inclined portion.

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