JP2021113007A - Floor structure of vehicle - Google Patents

Abstract

To sequentially deform a cross member from an outer end in a vehicle width direction to appropriately absorb a side collision load when the lateral impact load is input.SOLUTION: A floor structure of a vehicle comprises: a pair of right and left side sills 12, 12 extending along a vehicle longitudinal direction; a floor panel 14 arranged across the inside of each side sill in a vehicle width direction; and a cross member extending along the vehicle width direction between the side sills 12. The cross member has: an on-panel front cross member 58 which is arranged on the floor panel, and to which front legs of a front seat are fixed; and an on-panel center cross member 60 which is arranged on the floor panel, and to which rear legs of the front seat are fixed; and an under-panel center cross member 32 arranged under the floor panel. The on-panel center cross member 60 and the under-panel center cross member 32 are arranged at positions where they overlap in a vehicle vertical direction.SELECTED DRAWING: Figure 7

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 batteries are arranged under the floor, in order to protect the batteries against side collisions (side collisions), for example, the ends of the cross members constituting the vehicle body are easily crushed, or the ends of the cross members are easily crushed. Side collision measures 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 outer end portion of a cross member provided across the left and right side sills in the vehicle width direction is widened and the cross section of the outer end portion is increased to increase the amount of side collision energy absorbed. Has been done.

Further, Patent Document 2 discloses a structure in which the outer end portion of the cross member in the vehicle width direction is composed of two upper and lower stages including an upper member and a lower member. According to Patent Document 2, when the lateral impact load is input, the lateral impact load can be first absorbed by the lower member, and then the lateral impact load can be distributed to the upper member and the floor panel to protect the battery. There is.

Japanese Patent No. 4858183 JP-A-2019-23029

However, in the side collision absorption structure disclosed in Patent Document 1, the outer end portion of the cross member in the vehicle width direction has an asymmetrical shape in the vertical direction. Therefore, in Patent Document 1, for example, when a lateral impact load is input to the upper portion and the lower portion of the outer end portion of the cross member in the vehicle width direction at the same time, only the outer end portion in the vehicle width direction of the cross member is first deformed. It becomes difficult to absorb the lateral impact load. In other words, in Patent Document 1, since the upper portion and the lower portion of the outer end portion in the vehicle width direction of the cross member have an asymmetrical shape, when the lateral impact load is input, the upper portion and the lower portion of the outer end portion in the vehicle width direction are separated from each other. The amount of deformation becomes unbalanced, and it becomes difficult to deform the upper part and the lower part of the outer end portion in the vehicle width direction at the same time or substantially at the same time.

Further, in the side collision absorption structure disclosed in Patent Document 2, it is necessary to arrange a cross member composed of two upper and lower stages on the floor panel. Therefore, in Patent Document 2, the upward ridge of the central portion of the floor panel becomes large, the space portion in the vehicle interior is reduced, and the convenience of the occupant is lowered.

The present invention has been made in view of the above points, and when a lateral impact load is input, the cross member can be sequentially deformed from the outer end in the vehicle width direction to suitably absorb the lateral impact load. The purpose is to provide a floor structure for a vehicle.

Another object of the present invention is to provide a floor structure of a vehicle capable of securing a space in a vehicle interior and improving convenience for occupants.

In order to achieve the above object, the present invention has a vehicle floor structure in which a battery case in which a battery is housed is provided, and the battery case is arranged from under the floor of the front seat toward the rear of the vehicle. , A pair of left and right side sills arranged on the outside in the vehicle width direction and extending along the vehicle front-rear direction, a floor panel arranged on the inside of each side sill in the vehicle width direction, and a vehicle width between the pair of left and right side sills. A cross member extending along the direction is provided, and the cross member is arranged on the floor panel and the front cross member on the panel on which the front legs of the front seat are fixed, and the front cross member is arranged on the floor panel. The panel upper center cross member to which the rear leg portion of the seat is fixed and the panel lower center cross member arranged under the floor panel are provided, and the panel upper center cross member and the panel lower center cross member are , It is characterized in that it is arranged at a position where it overlaps in the vertical direction of the vehicle.

According to the present invention, when a lateral impact load is input, the cross member is sequentially deformed from the outer end in the vehicle width direction to obtain a vehicle floor structure capable of suitably absorbing the lateral impact load.

Further, according to the present invention, it is possible to obtain a vehicle floor structure capable of securing a space in the vehicle interior and improving the convenience of the occupants.

It is a bottom view seen from the lower side of the vehicle to which the floor structure which concerns on embodiment of this invention is applied. FIG. 1 is a bottom view showing a state in which the undercover is removed. 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. It is sectional drawing along the VV line of FIG. It is sectional drawing along the VI-VI line of FIG. FIG. 5 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 6 is a partially enlarged cross-sectional view of FIG. 6 including a side sill.

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 (motor for traveling), and electric devices 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. 2, the vehicle 10 is arranged 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 inside each side sill 12 in the vehicle width direction. A floor panel 14 and a battery case 18 arranged under the panel of the floor panel 14 and containing a battery in a chamber 16 (see FIGS. 5 and 6), and a cross member arranged along the vehicle width direction. It is configured with. On the lower side of the battery case 18, as shown in FIGS. 1 and 5 to 7, an undercover 19 that covers and protects the entire lower surface of the battery case 18 is arranged.

As shown in FIG. 1, the undercover 19 is attached to the lower surface of the battery case 18 via a plurality of bolts. Further, the right end portion of the undercover 19 is fastened to the inner end portion of the heat shield plate 21 via a plurality of bolts. The outer end of the heat shield plate 21 is fastened to the right side sill 12 via a plurality of bolts. As a result, the undercover 19 is fixed to the right side sill 12 via the heat shield plate 21.

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. 2 and 3, 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 vehicle rear end of each panel lower side frame 22 and extending along the vehicle front-rear direction. It has a pair of left and right under-panel tunnel frames 26, 26 which are arranged between each panel lower side frame 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.

The floor frame 24 under each panel is provided with a case fixing portion (another case fixing portion) 23 for fixing the four corners of the battery case 18. The case fixing portion 23 includes a bolt B (see FIG. 2) that penetrates the outer end portion of the battery 18 in the vehicle width direction along the vehicle vertical direction, and a bolt fastening hole 25 (FIG. 3) that fastens the screw portion of the bolt B. See) and consists of.

Further, a cross member under the panel is arranged under the floor of the vehicle 10. As shown in FIG. 3, 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 axial axis.

In the center cross member 32 under the panel, 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, 12 are formed along the vehicle width direction. They are connected (see FIGS. 3 and 8).

As shown in FIG. 3, 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. The lower tunnel frames 26, 26 have a connecting frame 40 that connects the rear ends of the vehicle 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 inner end of the outrigger 38 along the axial direction is connected to the floor frame 24 under the panel, and the outer end of the outrigger 38 along the axial direction is connected to the side sill 12. As a result, the outrigger 38 connects the floor frame 24 under each panel and each side sill 12 along the vehicle width direction. Further, the outrigger 38 and the front cross member 58 on the panel, which will be described later, are arranged at positions where they overlap in the vertical direction of the vehicle. 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. 2, the center cross member 32 under the panel is provided with a case fixing portion 42 for fixing the central portion of the battery case 18 along the vehicle front-rear direction. The case fixing portion 42 has a bolt B that penetrates the battery case 18 in the vertical direction of the vehicle, a bolt insertion hole 33 provided in the center cross member 32 under the panel, and a nut N that is fastened to the screw portion of the bolt B. (See FIG. 7).

As shown in FIG. 5, the battery case 18 includes an upper case 46 and a lower case 48 integrally molded from a light metal material, respectively, and has a chamber 16 sealed inside. The battery case 18 is arranged from under the floor of the front seat toward the rear of the vehicle. A plurality of batteries and the like, which are driving energy sources for the electric motor, 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 formed by a plurality of bolts B, a center cross member 32 under the panel, and a pair of left and right floor frames under the panel 24, 24. It is fastened and fixed to each. Further, the height dimension of the battery case 18 along the vehicle front-rear direction is such that the front portion of the battery case 18 has a height H1 and is higher than the height H2 of the rear portion of the battery case 18 (H1> H2). (See FIG. 5).

As shown in FIG. 7, the central portion of the upper case 46 and the lower case 48 has tubular portions 47 and 49 extending coaxially along the vertical direction of the vehicle, respectively. In each of the tubular portions 47 and 49 of the upper case 46 and the lower case 48, a bolt insertion hole extending coaxially when the upper case 46 and the lower case 48 are set is formed. A bolt (fastening member) B is inserted through the bolt insertion holes of the tubular portions 47 and 49 to penetrate the battery case 18 in the vertical direction, and the screw portion of the bolt B is fastened with a nut N to fasten the battery case. 18 is fastened and fixed to the center cross member 32 under the panel.

Returning to FIG. 1, in the present embodiment, a guard member 92 for avoiding a collision between the vehicle front portion of the battery case 18 and the piping erected on the tunnel frame 26 under the panel is arranged in front of the vehicle of the battery case 18. .. The guard member 92 has a substantially A shape when viewed from the bottom and is supported at three points. That is, the acute-angled vehicle front end portion 92a of the guard member 92 is fastened and fixed to the tunnel frame 26 under the panel on the right side via bolts (not shown). The bifurcated rear end portions 92b and 92c of the guard member 92 are fastened and fixed to the bottom surface fixing portions 93 and 93 (see FIG. 2) of the battery case 18 (lower case 48) via bolts (not shown), respectively. ing. By supporting the guard member 92 at three points, even if the guard member 92 is deformed, downward discharge of the exhaust pipe, piping, or the like can be promoted.

Further, as shown in FIG. 4, in the present embodiment, a tunnel portion 68 projecting upward is provided on the upper surface of the floor panel 14. On the upper surface of the tunnel portion 68, a space portion 88 (see FIGS. 2 to 5) through which pipes and cables (not shown) are passed and a space portion 88 (see FIG. 5) in which the charger 86 is arranged are provided.

Further, in the present embodiment, ducts 90 are arranged above the vehicle of the charger 86 so as to be superimposed along the vertical direction (see FIG. 5). Furthermore, in the present embodiment, a battery temperature controller 94 that controls the temperature of the battery is arranged in front of the vehicle of the battery case 18 (see FIG. 1). A tray portion 96 of the undercover 19 is arranged below the vehicle of the battery temperature controller 94. The tray portion 96 is provided with a plurality of drain holes 98 which are arranged offset in the vehicle width direction and penetrate the upper and lower surfaces of the tray portion 96. In this embodiment, three drain holes 98 are illustrated in FIG. 1, but the present invention is not limited to these. Further, the tray portion 96 may be a part of the undercover 19 or a separate body from the undercover 19. Further, the battery temperature controller 94 includes both a battery cooler and a battery heater.

Next, the structure on the panel will be described in detail.
As shown in FIG. 4, on the panel of the vehicle 10, a pair of left and right panel upper side frames 50 and 50, a pair of left and right panel upper floor frames 52 and 52, and a pair of left and right panel upper tunnel frames 54 and 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. A 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 and extend along the vehicle front-rear direction. A pair of left and right panel-top tunnel frames 54 are arranged between the panel-top side frames 50 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 upper panel center cross member 60 and the lower panel center cross member 32 are arranged at overlapping positions in the vertical direction of the vehicle, except for the central tunnel portion 68 (see FIG. 7). Further, in the present embodiment, in the vertical direction of the floor panel 14, the cross-sectional shape of the outer end portion of the panel upper center cross member 60 and the panel lower center cross member 32 (cross member) in the vehicle width direction is substantially symmetrical in the vertical direction. (See Fig. 8). Further, the vehicle width direction outer end portion 60a of the panel upper center cross member 60 and the vehicle width direction outer end portion 32a of the panel lower center cross member 32 are respectively connected to the center pillar 82 via the side sill 12.

As shown in FIG. 7, the lower panel center cross member 32 has a convex portion 70 that projects 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 a joining flange (see FIG. 8).

A tunnel portion 68 projecting upward is provided on the upper surface of the floor panel 14. On the upper surface of the tunnel portion 68, a space portion 88 for passing pipes and cables (not shown) (see FIGS. 2 to 4) and a space portion 88 for arranging the charger 86 (see FIG. 5) are respectively. It is provided. A duct 90 is arranged above the vehicle of the charger 86.

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 (see FIG. 4). The plurality of seat mount brackets 62 are spaced apart from each other on both the left and right sides along the vehicle width direction. The pair of front legs and the pair of rear legs of each seat composed 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 right 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 right 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, in the right front seat, the right rear leg portion arranged on the right side sill 12 side and the left rear leg portion arranged on the tunnel frame 54 side on the left panel are connected to the right panel via the seat mount bracket 62. It is fixed to each of the upper center cross members 60.

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

The seat mount bracket 62 has a box-like cross section and is fixed to the vehicle body side member via an inner fixing portion arranged inside in the vehicle width direction and an outer fixing portion arranged outside in the vehicle width direction (FIG. FIG. 8).

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. 8, 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 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 in 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 so as 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 to face 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. The 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, the upper panel center cross member 60 on the floor panel 14 and the lower panel center cross member 32 below the floor panel 14 are arranged at positions where they overlap in the vehicle vertical direction except for the central tunnel portion 68. There is. In the present embodiment, the cross-sectional shape of the outer end portion of the cross member (center cross member 60 on the panel, center cross member 32 below the panel) in the vehicle width direction at the top and bottom of the floor panel 14 may be substantially symmetrical in the vertical direction. can. As a result, in the present embodiment, when the lateral impact load is simultaneously input to the panel upper center cross member 60 and the panel lower center cross member 32, the cross members (panel upper center cross member 60, panel lower center cross member 32). ) Can be sequentially deformed from the outer end in the vehicle width direction to suitably absorb the lateral impact load. In other words, in the present embodiment, the vertical cross-sectional shape of the outer end portion of the cross member in the vehicle width direction is made substantially symmetrical, so that the lateral impact load is in the vertical direction with respect to the end portion in the vehicle width direction of the cross member. Even when they are input at the same time, the lateral impact load transmitted from the side sill 12 can be absorbed in a well-balanced manner in the vertical direction.

Further, in the present embodiment, since only the center cross member 60 on the panel is arranged on the floor panel 14, it is possible to suppress the upward swelling of the central portion of the floor panel 14. As a result, in the embodiment, it is possible to secure a desired vehicle interior space on the floor panel 14 and improve the convenience of the occupants.

Further, in the present embodiment, the vehicle width direction outer end portion 60a of the panel upper center cross member 60 and the vehicle width direction outer end portion 32a of the panel lower center cross member 32 are respectively connected to the center pillar 82 via the side sill 12. There is. Below the floor panel 14, a pair of left and right floor frames 24, 24 under the panel, which extend along the front-rear direction of the vehicle and are connected to the rear end side of the vehicle, are arranged. .. Below the floor panel 14, outriggers 38 that connect the floor frame 24 under each panel and each side sill 12 at both ends along the vehicle width direction are arranged. The front cross member 58 and the outrigger 38 on the panel are arranged at positions where they overlap in the vertical direction of the vehicle.

In the present embodiment, since the front cross member 58 on the panel arranged on the panel and the outrigger 38 arranged under the panel are arranged at a position where they overlap in the vertical direction of the vehicle, the side input from the side sill 12 The thrust load can be distributed and transmitted to the front cross member 58 and the outrigger 38 on the panel, respectively. Further, the lateral impact load transmitted to the outrigger 38 under the panel is further transmitted to the floor frame 24 under the panel extending along the vehicle front-rear direction, and the transmission direction of the lateral impact load is changed from the vehicle width direction to the vehicle front-rear direction. can do. The transmission direction conversion of the side impact load of the outrigger 38 is lower than that of the center cross member 32 under the panel that transmits the side impact load only along the vehicle width direction, but the main load of the lateral impact load is , Since it is transmitted from the center pillar 82 to the center cross member 60 on the panel and the center cross member 32 below the panel, there is no particular problem. Further, the pair of left and right front cross members 58 and 58 on the panel are arranged at the outer end portions in the vehicle width direction, respectively, and the lower panel cross members are not arranged below the central portion thereof. Therefore, the vertical dimension of the battery can be expanded by effectively utilizing the space in the lower portion of the central portion. For example, battery control devices, peripheral devices, and the like can be arranged in this expanded space.

Further, in the present embodiment, the center cross member 32 under the panel is provided with a case fixing portion 42 for fixing the central portion of the battery case 18 along the vehicle front-rear direction. Thereby, in the present embodiment, the central portion of the battery case 18 can be fastened and fixed to the panel lower center cross member 32 which is a vehicle body side member by the case fixing portion 42. As a result, in the present embodiment, it is possible to suppress the vibration of the battery case 18 while the vehicle is running.

Furthermore, in the present embodiment, a pair of left and right floor frames 24, 24 extending along the front-rear direction of the vehicle are arranged under the floor panel 14. The floor frame 24 under each panel is provided with a case fixing portion 23 (another case fixing portion) for fixing the battery case 18. Thereby, in the present embodiment, the peripheral portion of the battery case 18 can be fixed to the floor frame 24 under the panel, which is a member on the vehicle body side, by the case fixing portion 23. As a result, in the present embodiment, the vibration of the battery case 18 while the vehicle is running can be further suppressed.

Furthermore, in the present embodiment, a guard member for avoiding a collision between the vehicle front portion of the battery case 18 and the piping erected on the tunnel frame 26 under the panel is arranged in front of the vehicle of the battery case 18. Thereby, in the present embodiment, for example, it is preferable that the guard member collides with the battery case 18 even when the front collision load is input from the front of the vehicle and the piping, the exhaust pipe, or the like is retracted to the rear of the vehicle. Can be avoided.

Furthermore, in the present embodiment, a tunnel portion 68 projecting upward is provided on the upper surface of the floor panel 14, and a space for arranging the charger 86 while passing pipes and cables on the upper surface of the tunnel portion 68. A part 88 is provided. Thereby, in the present embodiment, the piping, the cable, and the like can be protected by the tunnel portion 68 and the charger 86. In addition, the battery arranged under the floor panel 14 and the cable can be easily electrically connected.

Furthermore, in the present embodiment, the duct 90 is laminated and arranged above the vehicle of the charger 86. Thereby, in the present embodiment, the space efficiency of the vehicle interior on the floor panel 14 can be improved.

Furthermore, in the present embodiment, the floor frame 52 on the panel arranged on the floor panel 14 and the floor frame 24 below the panel arranged under the floor panel 14 are provided, respectively. Further, behind the vehicle of the panel lower center cross member 32, a panel lower middle cross member 34 extending along the vehicle width direction is arranged. The vehicle rear end of each panel lower floor frame 24 is coupled to the panel lower middle cross member 34 via a gusset 28. In the present embodiment, the front impact load input from the front of the vehicle is transmitted to the front side frame 20. Further, the front collision load is transmitted from the front side frame 20 to the panel lower middle cross member 34 via the panel upper floor frame 52 and the panel lower floor frame 24. As a result, in the present embodiment, the front impact load is input from the front of the vehicle. The front impact load generated can be suitably absorbed by the middle cross member 34 under the panel.

Furthermore, in the present embodiment, the battery case 18 is composed of an upper case 46 and a lower case 48, which are integrally molded with a light metal material, respectively. The upper case 46 and the lower case 48 have tubular portions 47 and 49 extending in the vertical direction of the vehicle, respectively. The battery case 18 is fastened and fixed to the center cross member 32 under the panel by a pair of bolts B penetrating the tubular portion 47 of the upper case 46 and the tubular portion 49 of the lower case 48. Thereby, in the present embodiment, the tubular portions 47 and 49, which are the bolt fastening portions, can be integrally formed with the battery case 18 (upper case 46 and lower case 48). Further, in the present embodiment, when the battery case 18 is attached to the lower center cross member 32 of the panel via the bolt B, the lower end of the tubular portion 47 of the upper case 46 and the tubular portion 49 of the lower case 48 Can be coaxially crimped to the upper end of the bolt B via the bolt B. As a result, in the present embodiment, the battery case 18 can be more firmly fixed to the center cross member 32 under the panel, which is a member on the vehicle body side.

Furthermore, in the present embodiment, an undercover 19 that covers the battery case 18 is arranged below the battery case 18. The undercover 19 is fixed to each side sill 12 via a heat shield plate 21. As a result, in the present embodiment, the exhaust pipe can be arranged below the heat shield plate 21, and the exhaust pipe can be arranged on the side of the battery case 18 in the vehicle width direction. Further, in the present embodiment, the lower side of the battery case 18 projecting downward from the side sill 12 can be suitably protected by the undercover 19 arranged below the battery case 18.

Furthermore, in the present embodiment, the battery temperature controller 94 is arranged in front of the vehicle of the battery case 18. A tray portion 96 of the undercover 19 is arranged below the vehicle of the battery temperature controller 94, and the tray portion 96 has a plurality of drain holes 98 arranged offset in the vehicle width direction. .. As a result, in the present embodiment, the water leaked from the battery temperature controller 94 is collected by the drain hole 98 and drained to the road surface side, so that the leaked water of the battery temperature controller 94 is visually confirmed or not shown. Maintenance can be improved by detecting with a sensor or the like. Further, in the present embodiment, the air resistance can be reduced by arranging the plurality of drain holes 98 at an offset along the vehicle width direction.

10 Vehicle 12 Side sill 14 Floor panel 16 Room 18 Battery case 19 Undercover 21 Heat shield 23 Case fixing part (other case fixing part)
24 Panel lower floor frame 26 Panel lower tunnel frame 28 Gasset 32 Panel lower center cross member 32a (of the panel lower center cross member) Vehicle width direction outer end 38 Out trigger 42 Case fixing part 46 Upper case 48 Lower case 52 Panel upper floor Frame 60 Panel top center cross member 60a (of panel top center cross member) Outer end in vehicle width direction 68 Tunnel part 82 Center pillar 84 Exhaust piping 86 Charger 88 Space part 90 Duct 92 Guard member 94 Battery temperature controller 96 Undercover Tray part 98 Drain hole

Claims (11)

It is a floor structure of a vehicle having a battery case in which a battery is housed, and the battery case is arranged from under the floor of the front seat toward the rear of the vehicle.
A pair of left and right side sills that are arranged 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 cross member extending along the vehicle width direction between the pair of left and right side sills,
With
The cross member
A front cross member on the panel arranged on the floor panel and to which the front legs of the front seat are fixed,
A center cross member on the panel, which is arranged on the floor panel and to which the rear legs of the front seat are fixed,
With the center cross member under the panel arranged under the floor panel,
Have,
The floor structure of a vehicle, wherein the center cross member on the panel and the center cross member on the lower panel are arranged at positions where they overlap in the vertical direction of the vehicle. In the floor structure of the vehicle according to claim 1.
The outer end portion of the center cross member on the panel in the vehicle width direction and the outer end portion in the vehicle width direction of the lower center cross member of the panel are respectively connected to the center pillar via the side sill.
Below the floor panel, a pair of left and right floor frames under the panel that extend along the front-rear direction of the vehicle and are connected to the rear end side of the vehicle by a pair of left and right front side frames are arranged.
Under the floor panel, outriggers that connect the floor frame under each panel and each side sill at both ends along the vehicle width direction are arranged.
The floor structure of a vehicle, characterized in that the front cross member on the panel and the outrigger are arranged at positions where they overlap in the vertical direction of the vehicle. In the floor structure of the vehicle according to claim 1.
A vehicle floor structure characterized in that the center cross member under the panel is provided with a case fixing portion for fixing the battery case. In the floor structure of the vehicle according to claim 3.
Under the floor panel, a pair of left and right floor frames under the panel extending in the front-rear direction of the vehicle are arranged.
A vehicle floor structure, wherein the floor frame under each panel is provided with another case fixing portion for fixing the battery case. In the vehicle floor structure according to any one of claims 1 to 4.
A vehicle floor structure characterized in that a guard member for avoiding a collision between the front portion of the battery case and a pipe erected on a tunnel frame is arranged in front of the vehicle of the battery case. In the vehicle floor structure according to any one of claims 1 to 5.
A tunnel portion protruding upward is provided on the upper surface of the floor panel.
A vehicle floor structure characterized in that a space portion for arranging a charger is provided on the upper surface of the tunnel portion while passing pipes and cables. In the vehicle floor structure according to claim 6.
A vehicle floor structure characterized in that a duct is arranged above the vehicle of the charger. In the vehicle floor structure according to claim 2.
On the floor panel, a pair of left and right panel upper floor frames extending along the vehicle front-rear direction and being connected to the vehicle rear end side of the pair of left and right front side frames are arranged.
A middle cross member under the panel extending along the vehicle width direction is arranged behind the vehicle of the center cross member under the panel.
A vehicle floor structure, wherein a vehicle rear end portion of each panel lower floor frame is coupled to the panel lower middle cross member via a gusset. In the vehicle floor structure according to claim 3,
The battery case is composed of an upper case and a lower case, which are integrally molded with a light metal material, respectively.
The upper case and the lower case each have a tubular portion extending in the vertical direction of the vehicle.
The floor structure of a vehicle, wherein the battery case is fixed to the center cross member under the panel by a fastening member penetrating the tubular portion. In the vehicle floor structure according to claim 3,
An undercover covering the battery case is arranged below the battery case.
The undercover is a vehicle floor structure characterized in that it is fixed to each of the side sills via a heat shield plate. In the vehicle floor structure according to claim 3,
A battery temperature controller is arranged in front of the vehicle in the battery case.
An undercover covering the battery case is arranged below the battery case.
A tray portion of the undercover is arranged below the vehicle of the battery temperature controller.
The floor structure of the vehicle, wherein the tray portion of the undercover has a plurality of drain holes arranged offset in the vehicle width direction.

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