JP2020185901A - Lower body structure of electric vehicle - Google Patents

Abstract

To provide a lower body structure of an electric vehicle 1 that can achieve and secure both a foot space of an occupant and desired side collision performance.SOLUTION: A lower body structure of an electric vehicle 1 using output of a rotating electric machine as driving force comprises: a pair of left and right side sills 7; a nearly-flat front floor panel 8; and a second floor cross member 40, arranged on an upper surface of the front floor panel 8 between a front seat 18 and a rear seat, which connects in a vehicle width direction the left and right side sills 7 to each other, at a height lower than a height from the front floor panel 8 to an inner upper surface part 7a of the side sill 7. The second floor cross member 40 comprises, on a longitudinal section disposed along the vehicle width direction, an upward enlarged cross section part 40a having a cross sectional shape in the vicinity of an approximate center in the vehicle width direction enlarged toward an upper side of the vehicle so that an upper surface 43a is positioned at the upper side of the vehicle with respect to an upper surface in the vicinity of an end part in the vehicle width direction.SELECTED DRAWING: Figure 6

Description

The present invention relates to a lower body structure of an electric vehicle, for example, which does not have an exhaust pipe below the vehicle on the floor panel.

Recently, the number of electric vehicles that use the output of a rotary electric machine as a driving force is increasing instead of an internal combustion engine that uses gasoline or the like as fuel. In such an electric vehicle, an in-vehicle battery that supplies electric power to a rotary electric machine is arranged below the vehicle on a floor panel forming the floor surface of the vehicle interior (see Patent Documents 1 and 2).

By the way, in Patent Document 1, a floor cross member which is arranged on the upper surface of the floor panel and connects the left and right side sills in the vehicle width direction sandwiches a tunnel portion provided substantially in the center of the floor panel in the vehicle width direction. The arranged vehicle body structure is disclosed.
On the other hand, in Patent Document 2, the floor cross member is arranged on the upper surface of the floor panel and the left and right side sills are connected in the vehicle width direction so as to straddle the tunnel portion provided substantially in the center of the floor panel in the vehicle width direction. The arranged vehicle body structure is disclosed.

As described above, in Patent Document 1 and Patent Document 2, a tunnel portion is formed at substantially the center of the floor panel in the vehicle width direction so as to project upward from the vehicle and extend in the front-rear direction of the vehicle.
Since the tunnel portion of such a floor panel has conventionally been used as a space for arranging an exhaust pipe that exhausts the exhaust generated by the internal combustion engine from the rear part of the vehicle to the outside of the vehicle, it is not necessary for an electric vehicle that does not require an exhaust pipe. ..

Further, in an electric vehicle that does not require an exhaust pipe, by eliminating the need for a tunnel portion, it is expected that the weight of the vehicle will be reduced and the space at the feet of the occupants, that is, the space at the feet of the occupants will be expanded.
Therefore, in an electric vehicle that does not require an exhaust pipe, it is being studied to eliminate the need for a tunnel portion as a space for arranging the exhaust pipe and to form a passenger compartment floor surface with a relatively flat floor panel and a floor cross member. ..

However, when the height of the floor cross member connecting the left and right side sills is suppressed in order to secure the foot space of the occupant, the rigidity of the vehicle interior floor surface against the collision load from the vehicle side is provided, for example, a tunnel portion. It becomes lower than the rigidity of the floor surface of the passenger compartment, and there is a possibility that the desired lateral collision performance cannot be secured.

International Publication No. 2012/063393 Japanese Unexamined Patent Publication No. 2013-147137

In view of the above problems, it is an object of the present invention to provide a lower body structure of an electric vehicle that can secure both a occupant's foot space and a desired lateral collision performance.

The present invention is a lower body structure of an electric vehicle that uses the output of a rotary electric machine as a driving force, and comprises a pair of left and right side sills extending in the front-rear direction of the vehicle, a substantially flat floor panel arranged between the side sills, and a substantially flat floor panel. It is arranged on the upper surface of the floor panel between the front seat and the rear seat where the occupant is seated, and the left and right side sill are placed in the vehicle width direction at a height lower than the height from the floor panel to the upper surface of the side sill. The floor cross member is provided with a floor cross member connected to the vehicle width direction so that the upper surface is located above the vehicle surface with respect to the upper surface near the end portion in the vehicle width direction in a vertical cross section along the vehicle width direction. It is characterized by having an upward enlarged cross-sectional portion in which the cross-sectional shape near the center is enlarged upward of the vehicle.
The substantially flat floor panel refers to a floor panel that projects upward from the vehicle and is not provided with a tunnel portion that extends in the front-rear direction of the vehicle.

According to the present invention, it is possible to secure both the foot space of the occupant and the desired lateral collision performance.
Specifically, the floor cross member arranged between the front seat and the rear seat has a height lower than the height from the floor panel to the upper surface of the side sill, so that the lower body structure of the electric vehicle is the floor. Compared to the floor cross member, which is approximately the same height as the height from the panel to the upper surface of the side sill, it is possible to secure a wider foot space for the occupants seated in the rear seats.

Further, since the floor cross member is provided with the upward enlarged cross section, the lower body structure of the electric vehicle can improve the rigidity of the floor cross member long in the vehicle width direction in the vicinity of substantially the center in the vehicle width direction.
As a result, the lower body structure of the electric vehicle can improve the rigidity of the vehicle interior floor surface against a collision load from the vehicle side.

Therefore, the lower body structure of the electric vehicle can suppress, for example, buckling deformation or bending deformation of the floor panel at substantially the center in the vehicle width direction when a lateral thrust load from the vehicle side is applied.
Therefore, the lower body structure of the electric vehicle can secure both the foot space of the occupant and the desired lateral collision performance.

As an aspect of the present invention, the floor cross member connects the left and right side sills, is fixed to the cross member main body having a closed cross section extending in the vehicle width direction with the floor panel, and is fixed to the cross member main body. It may be formed of the cross member reinforcing member forming the upward enlarged cross-sectional portion, and the cross member main body may be formed in a shape having a substantially flat upper surface and a substantially rectangular upper surface in a plan view.

According to the present invention, in the lower body structure of the electric vehicle, the ridge line along the front end and the ridge line along the rear end on the upper surface of the cross member main body can be made substantially linear. Therefore, the lower body structure of the electric vehicle can efficiently transmit the collision load from the side of the vehicle from one side sill to the other side sill via the floor cross member.
Therefore, the lower body structure of the electric vehicle can ensure stable lateral collision performance without impairing the foot space of the occupant.

Further, as an aspect of the present invention, the floor panel is provided with a pair of left and right floor frames extending in the front-rear direction of the vehicle in the vicinity of the side sill, and the cross member main body is located between the floor frames. It is composed of a member central portion and a pair of left and right member end portions located at both ends in the vehicle width direction of the member central portion, and the member central portion is composed of one member having a rigidity higher than the rigidity of the member end portion. May be done.

According to the present invention, the lower body structure of the electric vehicle can improve the rigidity of the vehicle interior floor surface between the left and right floor frames, so that more stable lateral collision performance can be ensured.
Specifically, since the member end of the floor cross member is located between the floor frame and the side sill, the lower body structure of the electric vehicle applies the collision load acting on the side sill from the vehicle side to the floor cross member. It can be distributed and transmitted to the floor frame and the central part of the member of the floor cross member through the member end of the floor cross member.

At this time, since the rigidity of the member end portion is lower than the rigidity of the member central portion, the lower body structure of the electric vehicle can absorb the collision load from the vehicle side by the deformation of the member end portion. Therefore, the lower body structure of the electric vehicle can suppress the lateral impact load acting on the central portion of the member from the side of the vehicle.
As a result, the lower body structure of the electric vehicle can improve the rigidity of the vehicle interior floor surface between the left and right floor frames, so that more stable lateral collision performance can be ensured.

Further, as an aspect of the present invention, the cross member reinforcing member is joined to the floor panel via the lower end of the cross member main body in a vertical cross section along the vehicle front-rear direction, and is closed by the cross member main body. It may be formed in a cross-sectional shape forming a cross section.

According to the present invention, the lower body structure of the electric vehicle can further improve the rigidity of the floor cross member in the vicinity of substantially the center in the vehicle width direction. Therefore, the lower body structure of the electric vehicle can secure more stable lateral collision performance without impairing the foot space of the occupant.

Further, as an aspect of the present invention, the upper surface of the cross member reinforcing member is provided with seat fixing portions to which the rear legs of the front seats are fixed at both ends in the vehicle width direction, and the seat fixing portions are provided in the vehicle width direction. In the vertical cross section along the line, the vehicle may be formed at substantially the same vertical position in the vehicle width direction on the upper surface of the upward enlarged cross section.

According to the present invention, the lower body structure of the electric vehicle forms a ridge line along the front end and a ridge line along the rear end on the upper surface of the cross member reinforcing member in a substantially straight line even when a seat fixing portion is provided. can do. Therefore, the lower body structure of the electric vehicle can more efficiently transmit the collision load from the side of the vehicle from one side sill to the other side sill via the floor cross member.

Further, the lower body structure of the electric vehicle can suppress unevenness in the vertical direction of the vehicle on the upper surface of the cross member reinforcing member, so that the height of the floor cross member can be suppressed and the formability of the cross member reinforcing member can be improved. Can be improved.
Therefore, the lower body structure of the electric vehicle can secure the foot space of the occupant, stable side collision performance, and moldability of the floor cross member.

Further, as an aspect of the present invention, a long member having a long shape in the front-rear direction of the vehicle and having a front portion and a rear portion connected to a vehicle body is provided, and the long member has a vertical cross section along the vehicle width direction. The side wall portion of the long member may be fixed to the upward enlarged cross-sectional portion of the floor cross member, which is formed in a substantially gate-shaped cross section having a pair of left and right side wall portions facing in the vehicle width direction.

The long member refers to, for example, a support member that supports the center console, a support member that supports the shift lever, a load transmission member that functions as a member that transmits a load in the front-rear direction of the vehicle, and the like.

According to the present invention, the lower body structure of the electric vehicle can suppress the increase in weight and secure more stable lateral collision performance.
Specifically, since the upwardly enlarged cross section of the floor cross member that is long in the vehicle width direction can be supported by the long member whose front and rear parts are connected to the vehicle body, the lower body structure of the electric vehicle is the floor. It is possible to improve the rigidity of the cross member near the center in the vehicle width direction.

Further, since the side wall portion of the long member is fixed to the upward enlarged cross-sectional portion, the lower body structure of the electric vehicle applies the lateral thrust load acting on the floor cross member from the vehicle side via the long member. It can be distributed and transmitted in the front-rear direction of the vehicle. Therefore, the lower body structure of the electric vehicle can improve the rigidity of the vehicle interior floor surface with respect to the lateral impact load from the vehicle side.

In addition, since the side wall portion of the long member is not fixed to the floor panel, the lower body structure of the electric vehicle is higher and lower than the case where the side wall portion of the long member is fixed to the floor panel. The length in the direction can be shortened. As a result, in the lower body structure of the electric vehicle, the weight of the long member can be suppressed as compared with the case where the side wall portion is fixed to the floor panel.
Therefore, the lower body structure of the electric vehicle can suppress the increase in weight and secure more stable lateral collision performance.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a lower body structure of an electric vehicle that can secure both a occupant's foot space and a desired lateral collision performance.

The external perspective view which shows the appearance in the passenger compartment part of an electric vehicle. The external perspective view which shows the appearance of the lower body of an electric vehicle. A plan view showing the appearance of the lower vehicle body in a plan view. A cross-sectional view taken along the line AA in FIG. The external perspective view which shows the appearance of the vehicle rear view of the bulging member. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is an enlarged cross-sectional view showing an enlarged cross section of a main part on the rear side of the vehicle in FIG. The external perspective view which shows the appearance of the vehicle forward view in the kick-up reinforcing member. FIG. 3 is a cross-sectional view taken along the line CC in FIG. FIG. 3 is a cross-sectional view taken along the line DD in FIG. The external perspective view which shows the appearance of the vehicle rear view in the 2nd support bracket.

An embodiment of the present invention will be described below with reference to the drawings.
The vehicle of the present embodiment is, for example, an electric vehicle including a battery unit such as a lithium ion secondary battery and a rotating electric machine that rotates by supplying electric power from the battery unit, and using the output of the rotating electric machine as a driving force. .. The lower vehicle body structure in the passenger compartment portion of the electric vehicle 1 will be described in detail with reference to FIGS. 1 to 11.

Note that FIG. 1 shows an external perspective view of the passenger compartment portion of the electric vehicle 1, FIG. 2 shows an external perspective view of the lower vehicle body of the electric vehicle 1, FIG. 3 shows a plan view of the lower vehicle body, and FIG. The cross-sectional view taken along the line AA in No. 3 is shown, and FIG. 5 shows an external perspective view of the bulging member 14 when viewed from the rear of the vehicle.

Further, FIG. 6 shows a cross-sectional view taken along the line BB in FIG. 3, FIG. 7 shows an enlarged cross-sectional view of a main part on the rear side of the vehicle in FIG. 4, and FIG. 8 shows the front of the vehicle in the kick-up reinforcing member 50. A perspective view of the appearance of the visual view is shown, FIG. 9 shows a cross-sectional view taken along the line CC in FIG. 3, FIG. 10 shows a cross-sectional view taken along the line DD in FIG. 3, and FIG. 11 shows a second support bracket 62. The external perspective view of the vehicle rear view is shown.

Further, in order to clarify the illustration, the side sill outer 7A is omitted in FIGS. 1, 2, and 3, and the front floor panel 8 is below the vehicle in FIGS. 4, 6, and 7. The detailed illustration of the battery unit 16 arranged in the above is omitted.

Further, in the figure, the arrow Fr and the arrow Rr indicate the front-rear direction, the arrow Fr indicates the front direction, and the arrow Rr indicates the rear direction. Further, the arrow Rh and the arrow Lh indicate the vehicle width direction, the arrow Rh indicates the right direction, and the arrow Lh indicates the left direction.

As shown in FIG. 1, in the passenger compartment of the electric vehicle 1, an instrument panel 2 is arranged in the front portion of the passenger compartment, and a center console 3 and a shift are provided below the vehicle substantially in the center of the instrument panel 2 in the vehicle width direction. The lever 4 is arranged.
Although detailed illustration is omitted, in the passenger compartment of the electric vehicle 1, two front seats are arranged across the center console 3, and rear seats are arranged behind the center console 3. It shall be.

Further, as shown in FIG. 1, the center console 3 is composed of a center console front portion 3A located below the vehicle of the instrument panel 2 and a center console rear portion 3B connected to the vehicle rear side of the center console front portion 3A. It is configured.
As shown in FIG. 1, a design panel covering the base of the shift lever 4 is integrally provided on the rear portion 3B of the center console, and a cup holder 3a and an armrest 3b are arranged in this order behind the vehicle. ing.

Further, as shown in FIG. 2, the shift lever 4 is mounted and fixed to the console support bracket 60, which will be described later, via the shift lever support bracket 5. The front portion of the shift lever support bracket 5 is fastened and fixed to the upper surface of the first floor cross member 30, which will be described later, and the rear portion is fastened and fixed to the upper surface of the upright bracket 70.

As shown in FIGS. 1 and 2, the lower body of the electric vehicle 1 in the passenger compartment has a dash panel 6 that separates the motor chamber and the passenger compartment in the front-rear direction of the vehicle, and both ends of the dash panel 6 in the vehicle width direction. A pair of left and right side sills 7 extending from the lower part of the vehicle to the rear of the vehicle, a front floor panel 8 arranged between the left and right side sills 7 to form the floor of the passenger compartment, and a step up from the rear end of the front floor panel 8 to the upper part of the vehicle. The kick-up portion 9 is provided, and the rear floor panel 10 connected to the rear end of the kick-up portion 9 is provided.

Further, as shown in FIGS. 1 and 2, the lower body of the electric vehicle 1 includes a pair of left and right floor frame uppers 11 extending in the front-rear direction of the vehicle straddling the dash panel 6 and the front floor panel 8, and the floor frame upper 11. A pair of left and right floor frame lowers 12 (see FIG. 3) extending from the rear end to the rear of the vehicle, a first floor cross member 30 for connecting the left and right side sills 7 in the vehicle width direction, and a second floor cross member 40 are provided. ing.

In addition, as shown in FIGS. 1 and 2, the lower body of the electric vehicle 1 includes a kick-up reinforcing member 50 that connects the vicinity of the rear end of the front floor panel 8 and the kick-up portion 9, a shift lever 4, and a shift lever 4. It includes a console support bracket 60 that supports the center console 3 and an upright bracket 70 that supports the console support bracket 60 from below the vehicle.

Specifically, the dash panel 6 is a panel member having a thickness in the front-rear direction of the vehicle, and its lower portion is formed in a shape curved toward the rear of the vehicle. As shown in FIGS. 2 to 4, the dash panel 6 is formed with a tunnel-shaped portion 6a bulging in a substantially tunnel shape extending from the upper front of the vehicle to the lower rear of the vehicle in the vicinity of the center in the vehicle width direction. Has been done.
The tunnel shape portion 6a is formed of a separate member that covers an opening notched in the vicinity of the center in the vehicle width direction of the dash panel 6, and is integrally formed with the dash panel 6 by being joined to the dash panel 6.

Further, the left and right side sills 7 are configured such that the cross-sectional shape in the vertical cross section along the vehicle width direction is a closed cross section having a substantially rectangular cross section (see FIG. 6).
More specifically, the side sill 7 has a side sill outer 7A (see FIG. 6) having a substantially hat-shaped cross section protruding outward in the vehicle width direction and a substantially hat cross section protruding inward in the vehicle width direction in a vertical cross section along the vehicle width direction. It is composed of a side silly inner 7B (see FIG. 6).

Further, as shown in FIGS. 2 to 4, the front floor panel 8 is a substantially flat panel member having a thickness in the vertical direction of the vehicle, the front end thereof is joined to the lower end of the dash panel 6, and the rear end thereof is described later. It is joined to the lower end of the kick-up portion 9.

As shown in FIG. 4, a front opening S1 is formed in the front portion of the front floor panel 8 so as to be continuous with the internal space of the tunnel-shaped portion 6a in the dash panel 6 in the vicinity of the substantially center in the vehicle width direction. Has been done.
On the other hand, as shown in FIG. 4, a rear opening S2 is formed in the rear portion of the front floor panel 8 so as to be continuous with the internal space of the kick-up reinforcing member 50 described later in the vicinity of the substantially center in the vehicle width direction. ing.

Then, as shown in FIGS. 2 to 4, the above-mentioned front floor panel 8 covers the front opening S1 and is a bulging member that bulges upward from the tunnel-shaped portion 6a of the dash panel 6 so as to be continuous. 14 are joined. The bulging member 14 is formed with a length from the front end of the front floor panel 8 to the front end of the first floor cross member 30 in the vehicle front-rear direction.

More specifically, as shown in FIGS. 4 and 5, the bulging member 14 has a pair of left and right side wall portions 14a having a substantially triangular side view facing each other in the vehicle width direction, and the rear end thereof is below the vehicle with respect to the front end. The rear wall portion 14b inclined so as to be located, the lower end of the side wall portion 14a, and the flange portion 14c along the lower end of the rear wall portion 14b are formed in a substantially box shape in which the front portion of the vehicle and the lower portion of the vehicle are open. There is.

In the bulging member 14, the front portion of the side wall portion 14a and the front portion of the rear wall portion 14b are joined to the tunnel-shaped portion 6a of the dash panel 6, and the flange portion 14c is joined to the upper surface of the front floor panel 8. As a result, a substantially tunnel-like space continuous with the tunnel-shaped portion 6a of the dash panel 6 is formed.

Further, as shown in FIGS. 2 to 4, the kick-up portion 9 has a kick-up in which the cross-sectional shape in the vertical cross section along the vehicle front-rear direction extends from the rear end of the front floor panel 8 toward the upper side of the vehicle. The front surface portion 9a and the kick-up upper surface portion 9b extending from the upper end of the kick-up front surface portion 9a toward the rear of the vehicle are formed in a substantially L-shaped cross section.

As shown in FIG. 4, a third cross member 15 extending in the vehicle width direction is joined to the lower surface of the kick-up portion 9 so as to straddle the upper portion of the kick-up front surface portion 9a and the front portion of the kick-up upper surface portion 9b. Has been done. The third cross member 15 has a substantially L-shaped cross section having a corner portion at the lower rear side of the vehicle in a vertical cross section along the vehicle front-rear direction, and extends in the vehicle width direction with the kick-up portion 9. The cross section is formed so as to form a substantially rectangular closed cross section.

Further, the rear floor panel 10 is a panel member having a thickness in the vertical direction of the vehicle, and is joined to the rear end of the kick-up upper surface portion 9b of the kick-up portion 9. Although detailed illustration is omitted, it is assumed that the seat surface portion of the rear seat is mounted and fixed on the upper surface of the rear floor panel 10.

Further, as shown in FIGS. 2 and 3, the floor frame upper 11 is arranged so as to straddle the surface of the lower part of the dash panel 6 on the vehicle interior side and the upper surface of the front floor panel 8. Although detailed illustration of the floor frame upper 11 is omitted, the cross-sectional shape of the vertical cross-section along the vehicle width direction is substantially a hat-like cross section protruding upward of the vehicle, and the dash panel 6 and the front floor panel 8 have a cross-sectional shape. By being joined, a closed cross section having a substantially rectangular cross section extending in the front-rear direction of the vehicle is formed.

As shown in FIG. 3, the floor frame upper 11 is arranged near the outside in the vehicle width direction so as to pass through the vicinity of the side sill 7 in a plan view, and the rear end is in the vehicle width direction with respect to the front end. It is arranged so as to be located on the outside.

Further, as shown in FIG. 3, the floor frame lower 12 is arranged on the lower surface of the front floor panel 8 so as to be continuous with the floor frame upper 11 in a plan view.
More specifically, as shown in FIG. 3, the floor frame lower 12 is arranged so that the rear end is located outside in the vehicle width direction with respect to the front end. In other words, the floor frame lower 12 is arranged so as to pass through the vicinity of the left and right side sills 7.

As shown in FIG. 6, the floor frame lower 12 has a substantially hat-shaped cross section in a vertical cross section along the vehicle width direction and protrudes downward from the vehicle, and is joined to the lower surface of the front floor panel 8. Therefore, a closed cross section having a substantially rectangular cross section extending in the front-rear direction of the vehicle is formed.

Then, as shown in FIGS. 3 and 4, between the floor frame lowers 12 on the lower side of the vehicle of the front floor panel 8, electric power is supplied to the rotary electric machine in a range from the vicinity of the front end of the front floor panel 8 to the rear floor panel 10. A battery unit 16 for supplying a battery unit 16 is arranged.

Further, as shown in FIGS. 2 and 3, the first floor cross member 30 omits the left and right side sills 7 at positions adjacent to the rear end of the bulging member 14 on the front floor panel 8 on the rear side of the vehicle. They are connected in a straight line.
As shown in FIG. 4, the first floor cross member 30 is formed in a shape having a closed cross section extending in the vehicle width direction with the front floor panel 8 in a vertical cross section along the vehicle front-rear direction.

Further, as shown in FIGS. 2 and 3, the second floor cross member 40 connects the left and right side sills 7 substantially linearly at positions separated from the first floor cross member 30 at a predetermined distance behind the vehicle. doing.
As shown in FIG. 4, the second floor cross member 40 is formed in a shape having a closed cross section extending in the vehicle width direction with the front floor panel 8 in a vertical cross section along the vehicle front-rear direction.

Further, as shown in FIG. 6, the second floor cross member 40 has an upper surface near the center in the vehicle width direction located above the vehicle with respect to the outer upper surface in the vehicle width direction in a vertical cross section along the vehicle width direction. As such, it is formed in a shape having an upward enlarged cross-sectional portion 40a in which the cross-sectional shape near the center in the vehicle width direction is enlarged upward in the vehicle.

Further, as shown in FIGS. 2 to 4, the kick-up reinforcing member 50 covers the rear opening S2 of the front floor panel 8 at substantially the center in the vehicle width direction, and the kick-up front portion 9a and the front of the kick-up portion 9 are covered. It is connected to the floor panel 8.

Further, as shown in FIGS. 2 to 4, the console support bracket 60 connects the bulging member 14 of the front floor panel 8 and the kick-up reinforcing member 50 in the front-rear direction of the vehicle.
Further, the console support bracket 60 is fastened and fixed to the upper surface of the first floor cross member 30, the upper surface of the second floor cross member 40, and the upper surface of the upright bracket 70, respectively.

As shown in FIGS. 1, 2, and 4, the shift lever support bracket 5 that supports the shift lever 4 is mounted and fixed on the console support bracket 60, and the rear portion 3B of the center console is mounted and fixed. Has been done.
Further, as shown in FIGS. 2 and 4, the erection bracket 70 has an upper surface of the front floor panel 8 and an upper surface of the console support bracket 60 between the first floor cross member 30 and the second floor cross member 40. And are connected and supported.

Subsequently, the above-described second floor cross member 40, kick-up reinforcing member 50, and console support bracket 60 will be described in more detail.
As shown in FIGS. 3 and 6, the second floor cross member 40 includes a central member member 41 which is a member extending in the vehicle width direction between the floor frame lowers 12 and both ends of the center member member 41 in the vehicle width direction. It is composed of a pair of left and right end member members 42 that are joined and a cross member reinforcing member 43 that forms an upward enlarged cross-sectional portion 40a.

The central member member 41 is formed of one member having high rigidity with respect to the rigidity of the end member member 42. The central member member 41 is, for example, an ultra-high-strength steel plate having a plate thickness of 1.8 mm, and as shown in FIG. 7, the cross-sectional shape in the vertical cross section along the vehicle front-rear direction protrudes upward in the vehicle. It is formed in a substantially hat shape.

Specifically, as shown in FIGS. 6 and 7, the central member member 41 includes a member front surface portion 41a forming a surface on the front side of the vehicle, a member rear surface portion 41b forming a surface on the rear side of the vehicle, and an upper portion of the vehicle. A member upper surface portion 41c forming a surface, a front flange portion 41d extending from the lower end of the member front surface portion 41a to the front of the vehicle, and a rear flange portion 41e extending from the lower end of the member rear surface portion 41b to the rear of the vehicle are integrally formed. ing.

As shown in FIGS. 6 and 7, the central member member 41 has a front flange portion 41d and a rear flange portion 41e joined to the upper surface of the front floor panel 8.
As shown in FIGS. 3 and 6, the member upper surface portion 41c of such a central member member 41 has a substantially flat plate shape having a substantially rectangular shape in a plan view, and is located below the inner upper surface portion 7a of the side sill inner 7B. Is formed in.

On the other hand, the left and right end member members 42 are made of a high-tensile steel plate having a low rigidity with respect to the central member member 41 and having a plate thickness of, for example, 1.0 mm. The end member member 42 is formed so that the cross-sectional shape in the vertical cross section along the vehicle front-rear direction is a substantially hat-shaped cross section protruding upward of the vehicle and continuously extends in the vehicle width direction from the central member member 41. Has been done.

Specifically, as shown in FIGS. 3 and 6, the end member member 42 has a member upper surface portion 42a located at a position substantially the same as the member upper surface portion 41c of the central member member 41 in the vertical direction of the vehicle, and a member upper surface portion 42a. A member front surface 42b (see FIG. 3) extending downward from the front end of the member 42a, a member rear surface 42c extending downward from the rear end of the member upper surface 42a, and a lower end of the member front surface 42b. The front flange portion extending from the front to the front of the vehicle and the rear flange portion extending from the lower end of the member rear surface portion 42c to the rear of the vehicle are integrally formed.

In this end member member 42, the front flange portion and the rear flange portion are joined to the upper surface of the front floor panel 8, and the member upper surface portion 42a (front seat outer side fixing portion 42f described later) extends outward in the vehicle width direction. The extended portion is joined to the inner upper surface portion 7a of the side sill 7.

As shown in FIGS. 3 and 6, the member upper surface portion 42a of the end member member 42 has a length in the vehicle front-rear direction that is substantially the same as the length of the member upper surface portion 41c of the central member member 41 in the vehicle front-rear direction. It is formed in a substantially flat plate shape having a substantially rectangular shape in a plan view.

Further, on the outer side of the upper surface portion 42a of the member in the vehicle width direction, as shown in FIGS. 3 and 6, a front seat outer side fixing portion 42f to which the seat slide rail 17 on the outer side in the vehicle width direction is fastened and fixed bulges upward in the vehicle. It is made to be put out and integrally formed.

Due to the above-described configuration, the second floor cross member 40 includes a corner portion between the member front surface portion 41a and the member upper surface portion 41c in the central member member 41, and a member upper surface portion 42a and the member front surface in the end member member 42. A ridge line extending substantially linearly in the vehicle width direction is formed on the front side of the vehicle in the plan view and the front view by the corner portion with the portion 42b.

Further, the second floor cross member 40 has a corner portion between the member rear surface portion 41b and the member upper surface portion 41c in the central member member 41, and a corner portion between the member upper surface portion 42a and the member rear surface portion 42c in the end member member 42. Therefore, in the plan view and the rear view, a ridge line extending substantially linearly in the vehicle width direction is formed on the rear side of the vehicle.

Further, as shown in FIGS. 6 and 7, the cross member reinforcing member 43 has a cross-sectional shape in a vertical cross section along the vehicle front-rear direction, which is formed in a substantially hat-like cross section protruding upward of the vehicle, and is formed with the central member member 41. It is formed in a shape having a closed cross section extending in the vehicle width direction.

Specifically, as shown in FIGS. 6 and 7, the cross member reinforcing member 43 has an upper surface portion 43a located above the member upper surface portion 41c of the central member member 41 and a vehicle from the front end of the upper surface portion 43a. A pair of left and right front portions 43b extending downward, a rear surface portion 43c extending downward from the rear end of the upper surface portion 43a, and a pair of left and right portions extending downward from both ends of the upper surface portion 43a in the vehicle width direction. The side surface portion 43d, the front flange portion 43e extending from the lower end of the front surface portion 43b to the front of the vehicle, and the rear flange portion 43f extending from the lower end of the rear surface portion 43c to the rear of the vehicle are integrally formed.

Further, as shown in FIG. 6, the cross member reinforcing member 43 has a cross-sectional shape in a vertical cross section along the vehicle width direction having a cross-sectional hat shape, and has a closed cross section with the member upper surface portion 41c of the central member member 41. As described above, a pair of left and right side flange portions 43g extending outward in the vehicle width direction from the lower end of the side surface portion 43d are integrally formed.

Then, as shown in FIGS. 6 and 7, in the cross member reinforcing member 43, the front flange portion 43e is joined to the upper surface of the front floor panel 8 via the front flange portion 41d of the central member member 41, and the rear flange portion is formed. The 43f is joined to the upper surface of the front floor panel 8 via the rear flange portion 41e of the central member member 41, and the side flange portion 43g is joined to the member upper surface portion 41c of the central member member 41.

As shown in FIGS. 3, 6, and 7, the upper surface portion 43a and the side surface portion 43d of the cross member reinforcing member 43 have substantially the same length in the vehicle front-rear direction as the member upper surface portion 41c of the central member member 41. It is formed into a substantially rectangular shape in a plan view having dimensions.

Further, as shown in FIG. 6, front seat inner fixing portions 43h on which the rear portion of the seat slide rail 17 on the inner side in the vehicle width direction is fastened and fixed are provided at both ends of the upper surface portion 43a in the vehicle width direction. It is integrally formed at a position in the vertical direction of the vehicle, which is substantially the same as the central portion of the direction.

In addition, on the lower surface of the upper surface portion 43a, as shown in FIG. 6, two weld nuts 44 into which the fastening bolt T1 is screwed are provided in the vehicle width direction inside the front seat inner side fixing portion 43h in the vehicle width direction. They are joined at a predetermined interval. As shown in FIG. 6, the console support bracket 60 (the second fixing portion 673b of the second support bracket 62 described later) is fastened and fixed to the weld nut 44 via the fastening bolt T1.

Further, as shown in FIGS. 7 and 8, the kick-up reinforcing member 50 is joined to the kick-up front surface portion 9a of the kick-up portion 9 and the main body member 51 joined to the upper surface of the front floor panel 8 below the front of the vehicle. , It is composed of a cover member 52 detachably provided on the upper surface of the main body member 51.

As shown in FIGS. 8 to 9, the main body member 51 has a substantially L-shaped cross section in the vertical cross section along the vehicle front-rear direction, and the cross-sectional shape in the vertical cross section along the vehicle width direction is upward in the vehicle. It is formed in a substantially hat-like cross section with a protruding cross section. In other words, the main body member 51 is formed in a substantially box shape in which the lower part of the vehicle and the rear part of the vehicle are open.

More specifically, as shown in FIGS. 8 to 9, the main body member 51 includes an upper surface portion 51a formed at substantially the same vertical position of the vehicle at the lower end of the kick-up front surface portion 9a in the kick-up portion 9, and an upper surface portion. A pair of left and right side wall portions 51b extending downward from both ends of the 51a in the vehicle width direction and a front wall portion 51c extending downward from the front end of the upper surface portion 51a cover the rear opening S2 of the front floor panel 8. It is integrally formed in a substantially box shape.

Further, the main body member 51 includes a portion in which the lower end of the side wall portion 51b is extended outward in the vehicle width direction in a flange shape and a portion in which the lower end of the front wall portion 51c is extended in a flange shape in the front of the vehicle. A flange portion 51d having a substantially U-shape in a plan view is integrally formed along the lower end of the side wall portion 51b and the lower end of the front wall portion 51c.

Then, in the main body member 51, the upper surface portion 51a and the left and right side wall portions 51b are joined to the kick-up front surface portion 9a of the kick-up portion 9, and the flange portion 51d is joined to the upper surface of the front floor panel 8.

As shown in FIGS. 8 and 9, a weld nut 53 into which the fastening bolt T2 is screwed is provided on the side wall portion 51b of the main body member 51 through an opening provided at a position in front of the vehicle and above the vehicle. It is joined to the inner surface. The rear portion of the console support bracket 60 is fastened and fixed to the weld nut 53 via the fastening bolt T2.

Further, as shown in FIG. 7, an opening S3 is formed in the upper surface portion 51a so as to open a portion of the front floor panel 8 facing the rear opening S2 in a substantially rectangular shape in a plan view.
Further, as shown in FIGS. 8 and 9, four weld bolts 54 projecting upward from the vehicle are joined to the upper surface portion 51a around the opening S3. The rear portion of the console support bracket 60 and the cover member 52 are jointly fastened to the weld bolt 54.

On the other hand, as shown in FIGS. 7 and 8, the cover member 52 has a predetermined thickness in the vertical direction of the vehicle and is formed in a substantially flat plate shape covering the opening S3 of the main body member 51. As shown in FIGS. 7 and 9, the cover member 52 is fastened together with the weld bolt 54 of the main body member 51 with the rear portion of the console support bracket 60 interposed therebetween.

Further, as shown in FIGS. 2 and 3, the console support bracket 60 connects the bulging member 14 of the front floor panel 8 and the kick-up reinforcing member 50 in the front-rear direction of the vehicle. As shown in FIGS. 1 to 4, the console support bracket 60 includes a first support bracket 61 that supports the center console front portion 3A, a shift lever 4, and a center console rear portion 3B in the passenger compartment of the electric vehicle 1. It is composed of a second support bracket 62 that supports it.

As shown in FIG. 5, the first support bracket 61 includes a bracket main body 63 joined to the bulging member 14 of the front floor panel 8 and a rear reinforcement 64 for reinforcing the rear portion of the bracket main body 63. There is.
As shown in FIGS. 4 and 5, the first support bracket 61 is formed to have substantially the same length in the vehicle front-rear direction as the length of the bulging member 14 of the front floor panel 8 in the vehicle front-rear direction.

Specifically, as shown in FIGS. 5 and 10, the bracket main body 63 includes a pair of left and right bracket side wall portions 631 facing each other in the vehicle width direction, and a bracket upper surface portion 632 that connects the upper ends of the bracket side wall portions 631. , It is formed in the shape of a front view gate.

As shown in FIGS. 5 and 10, the bracket upper surface portion 632 is recessed below the vehicle and has a substantially concave groove-shaped concave groove portion 632a extending in the front-rear direction of the vehicle in the vicinity of substantially the center in the vehicle width direction. It is formed. The concave groove portion 632a is recessed in the upper surface portion 632 of the bracket from substantially the vicinity of the center in the vehicle front-rear direction to the rear end.

As shown in FIG. 4, the bracket main body 63 is separated from the rear wall portion 14b of the bulging member 14 in front of the rear reinforcement 64 described later in the vertical cross section along the vehicle front-rear direction. The upper surface portion 632 of the bracket at this position is connected to the rear wall portion 14b of the bulging member 14 via the connecting bracket 19 having a substantially Z-shaped cross section.

On the other hand, the rear reinforcement 64 of the first support bracket 61 is joined to the inner surface of the rear portion of the bracket main body 63 as shown in FIG. As shown in FIGS. 5 and 10, the rear reinforcement 64 is joined to a pair of left and right side surface portions 641 joined to the upper portion of the bracket side wall portion 631 of the bracket body 63 and to the bracket upper surface portion 632 of the bracket body 63. It is integrally formed with the formed upper surface portion 642.

As shown in FIGS. 5 and 10, a fastening bolt T3 is screwed into the rear portion of the side surface portion 641 of the rear reinforcement 64 through an opening provided in the bracket side wall portion 631 of the bracket main body 63. The weld nut 65 is welded. The front portion of the second support bracket 62 is fastened and fixed to the weld nut 65 via the fastening bolt T3.

Further, at the rear portion of the upper surface portion 642, as shown in FIGS. 5 and 10, a weld bolt 66 projecting upward in the vehicle through an opening provided in the bracket upper surface portion 632 of the bracket main body 63 is provided in the vehicle width direction. They are joined at a predetermined interval. The front portion of the second support bracket 62 is fastened and fixed to the weld bolt 66.

Further, as shown in FIG. 11, the second support bracket 62 includes a bracket body 67 connected to the rear portion of the first support bracket 61 and a front reinforcement 68 for reinforcing the front portion of the bracket body 67. Has been done.

As shown in FIGS. 9 to 11, the bracket main body 67 has a cross-sectional shape in a vertical cross section along the vehicle width direction, which is a substantially gate-shaped cross section with an opening below the vehicle width, and a pair of left and right brackets facing each other in the vehicle width direction. The bracket side wall portion 671 and the bracket upper surface portion 672 that connect the upper ends of the bracket side wall portions 671 in the vehicle width direction are integrally formed.

As shown in FIG. 11, the left and right bracket side wall portions 671 are formed in a substantially flat plate shape in which the length in the vehicle front-rear direction is longer than the length in the vehicle vertical direction. The bracket side wall portion 671 is formed to have a length in the vehicle vertical direction shorter than the length in the vehicle vertical direction from the bracket upper surface portion 672 to the upper surface of the front floor panel 8.

Further, as shown in FIG. 11, a flange portion 673 extending outward in the vehicle width direction is integrally formed at the lower end of the bracket side wall portion 671 from the front end to the rear end.
The flange portion 673 has a first fixing portion 673a fastened and fixed to the upper surface of the first floor cross member 30 and fastened and fixed to the upper surface of the second floor cross member 40 at positions spaced apart from each other in the vehicle front-rear direction. The second fixed portion 673b to be formed is further extended as a flange portion toward the outside in the vehicle width direction.

As shown in FIGS. 9 to 11, a bolt insertion hole 671a for allowing the fastening bolt T3 to be inserted is formed in the bracket side wall portion 671 in the vicinity of the front end, and the fastening bolt T2 is allowed to be inserted. An insertion hole 671b is formed in the vicinity of the rear end.

Further, as shown in FIGS. 2 to 4, the bracket upper surface portion 672 of the bracket main body 67 has a shift lever support bracket 5 for supporting the shift lever 4 from below the vehicle and a center console rear portion 3B at the front portion thereof. It is placed and fixed in this order from the front of the vehicle.

As shown in FIGS. 3 and 11, the bracket upper surface portion 672 is formed in a flat plate shape having a substantially constant length in the vehicle width direction and a length in the vehicle front-rear direction.
Therefore, the bracket body 67 of the second support bracket 62 has a corner portion between the bracket side wall portion 671 and the bracket upper surface portion 672 and a corner portion between the bracket side wall portion 671 and the flange portion 673, at least in a plan view. A ridgeline extending in a substantially straight line in the front-rear direction is formed.

Further, as shown in FIGS. 10 and 11, the bracket upper surface portion 672 is recessed in the lower part of the vehicle so as to be continuous with the concave groove portion 632a of the first support bracket 61, and the concave groove portion 672a extending in the front-rear direction of the vehicle. However, it is formed in the vicinity of the center in the vehicle width direction.

As shown in FIGS. 3 and 11, the concave groove portion 672a of the bracket upper surface portion 672 is recessed with a length in the vehicle front-rear direction from the front end of the bracket upper surface portion 672 to the vicinity of the second fixed portion 673b.
The concave groove portion 632a of the first support bracket 61 and the concave groove portion 672a of the second support bracket 62 not only improve the rigidity of the first support bracket 61 and the second support bracket 62, but also improve the rigidity of the first support bracket 61 and the second support bracket 62. It is formed as a storage space for accommodating a wire harness (not shown) that is arranged along the direction.

As shown in FIGS. 10 and 11, two bolt insertion holes 672b that allow the insertion of the weld bolt 66 of the first support bracket 61 are formed in such a bracket upper surface portion 672 with openings near the front end. Two bolt insertion holes 672c that allow insertion of weld bolts (not shown) of the first floor cross member 30 are formed in the first fixed portion 673a at substantially the same positions in the vehicle front-rear direction.

Further, as shown in FIGS. 9 to 11, a plurality of weld bolts (not shown) provided in the erection bracket 70 for fastening and fixing to the erection bracket 70 are allowed to be inserted into the bracket upper surface portion 672. A bolt insertion hole 672d is formed between the first fixing portion 673a and the second fixing portion 673b, and of the four weld bolts 54 of the kick-up reinforcing member 50, two weld bolts 54 on the front side of the vehicle are inserted. Two bolt insertion holes 672e that allow the above are formed in the vicinity of the rear end.

The front reinforcement 68 of the second support bracket 62 is joined to the inner surface of the front portion of the bracket body 67 as shown in FIGS. 10 and 11. As shown in FIGS. 10 and 11, the front reinforcement 68 is joined to a pair of left and right side surface portions 681 joined to the bracket side wall portion 671 of the bracket body 67 and to the bracket upper surface portion 672 of the bracket body 67. It is integrally formed with the upper surface portion 682 in a front view substantially gate shape.

In the console support bracket 60 having the above-described configuration, as shown in FIG. 10, the rear portion of the bracket side wall portion 631 of the first support bracket 61 and the front portion of the bracket side wall portion 671 of the second support bracket 62 are interposed via a fastening bolt T3. The rear portion of the bracket upper surface portion 632 of the first support bracket 61 and the front portion of the bracket upper surface portion 672 of the second support bracket 62 are fastened and fixed via the weld bolt 66. The 1 support bracket 61 and the 2nd support bracket 62 are connected in the front-rear direction of the vehicle.

Further, the console support bracket 60 is bulged by joining the bracket side wall portion 631 of the first support bracket 61 and the bracket upper surface portion 632 to the side wall portion 14a and the rear wall portion 14b of the bulging member 14, respectively. It is connected to the member 14.

In addition, as shown in FIG. 9, in the console support bracket 60, the bracket side wall portion 671 of the second support bracket 62 is fastened and fixed to the side wall portion 51b of the kick-up reinforcing member 50 via the fastening bolt T2, and the second support bracket 60 is second. The bracket upper surface portion 672 of the support bracket 62 is fastened together with the cover member 52 to the upper surface portion 51a of the kickup reinforcing member 50 via the weld bolt 54.

As a result, the console support bracket 60 connects the bulging member 14 of the front floor panel 8 and the kick-up reinforcing member 50 in the front-rear direction of the vehicle.
Further, in the console support bracket 60, the bracket upper surface portion 672 of the second support bracket 62 is provided on the upper surface of the first floor cross member 30 via a weld bolt (not shown) together with the front portion of the shift lever support bracket 5. It is tightened.

Then, as shown in FIGS. 2, 3, and 6, in the console support bracket 60, the first fixing portion 673a of the second support bracket 62 is fastened and fixed to the upper surface of the first floor cross member 30, and the second support bracket 60 is second. The second fixing portion 673b of the support bracket 62 is fastened and fixed to the cross member reinforcing member 43 of the second floor cross member 40 via the fastening bolt T1.

As described above, the lower body structure of the electric vehicle 1 whose driving force is the output of the rotary electric machine consists of a pair of left and right side sills 7 extending in the front-rear direction of the vehicle and a substantially flat front floor panel arranged between the side sills 7. The height is lower than the height from the front floor panel 8 to the inner upper surface portion 7a of the side sill 7 while being arranged on the upper surface of the front floor panel 8 between the front seat 18 and the rear seat where the occupants are seated. A second floor cross member 40 that connects the left and right side sills 7 in the vehicle width direction is provided, and the second floor cross member 40 is placed on the upper surface near the end portion in the vehicle width direction in a vertical cross section along the vehicle width direction. On the other hand, by providing the upward enlarged cross-sectional portion 40a in which the cross-sectional shape near the center in the vehicle width direction is enlarged upward in the vehicle width direction so that the upper surface portion 43a is located above the vehicle, the space under the feet of the occupant is desired. It is possible to secure both side collision performance.

Specifically, the height of the second floor cross member 40 arranged between the front seat 18 and the rear seat is set to be lower than the height from the front floor panel 8 to the inner upper surface portion 7a of the side sill 7. The lower body structure of the electric vehicle 1 has a foot space for occupants seated in the rear seats as compared with the second floor cross member 40 having a height substantially the same as the height from the front floor panel 8 to the inner upper surface 7a of the side sill 7. Can be widely secured.

Further, since the second floor cross member 40 is provided with the upward enlarged cross-sectional portion 40a, the lower body structure of the electric vehicle 1 has rigidity in the vicinity of the center substantially in the vehicle width direction of the second floor cross member 40 which is long in the vehicle width direction. Can be improved.
As a result, the lower body structure of the electric vehicle 1 can improve the rigidity of the vehicle interior floor surface against a collision load from the vehicle side.

Therefore, the lower body structure of the electric vehicle 1 suppresses buckling deformation or bending deformation of the front floor panel 8 substantially at the center in the vehicle width direction when a lateral thrust load from the vehicle side is applied. it can.
Therefore, the lower body structure of the electric vehicle 1 can secure both the foot space of the occupant and the desired lateral collision performance.

Further, the second floor cross member 40 connects the left and right side sills 7 and forms a closed cross section extending in the vehicle width direction with the front floor panel 8 (center member member 41, end member member 42). , Fixed to the cross member main body (center member member 41, end member member 42), and composed of a cross member reinforcing member 43 forming an upward enlarged cross-sectional portion 40a, the cross member main body (center member member 41, end portion). Since the member member 42) is formed in a shape having a substantially flat and substantially rectangular upper surface (member upper surface portion 41c, member upper surface portion 42a), the lower body structure of the electric vehicle 1 is a cross member main body. The ridge line along the front end and the ridge line along the rear end on the upper surface (member upper surface portion 41c, member upper surface portion 42a) of (center member member 41, end member member 42) can be made substantially linear.

Therefore, the lower body structure of the electric vehicle 1 can efficiently transmit the collision load from the side of the vehicle from one side sill 7 to the other side sill 7 via the second floor cross member 40.
Therefore, the lower body structure of the electric vehicle 1 can ensure stable lateral collision performance without impairing the foot space of the occupant.

Further, a central member member is provided on the front floor panel 8 and includes a pair of left and right floor frame lowers 12 extending in the front-rear direction of the vehicle in the vicinity of the side sill 7, and the cross member main body is located between the floor frame lowers 12. It is composed of 41 and a pair of left and right end member members 42 located at both ends in the vehicle width direction of the central member member 41, and the central member member 41 is one member having a rigidity higher than the rigidity of the end member member 42. Due to the configuration, the lower body structure of the electric vehicle 1 can improve the rigidity of the vehicle interior floor surface between the left and right floor frame lowers 12, so that more stable lateral collision performance can be ensured.

Specifically, since the end member member 42 of the second floor cross member 40 is located between the floor frame lower 12 and the side sill 7, the lower body structure of the electric vehicle 1 is on the vehicle side acting on the side sill 7. The collision load from the side can be distributed and transmitted to the floor frame lower 12 and the central member member 41 of the second floor cross member 40 via the end member member 42 of the second floor cross member 40.

At this time, since the rigidity of the end member member 42 is lower than the rigidity of the central member member 41, the lower body structure of the electric vehicle 1 absorbs the collision load from the vehicle side by the deformation of the end member member 42. can do. Therefore, the lower body structure of the electric vehicle 1 can suppress the lateral impact load acting on the central member member 41 from the side of the vehicle.
As a result, the lower body structure of the electric vehicle 1 can improve the rigidity of the vehicle interior floor surface between the left and right floor frame lowers 12, so that more stable lateral collision performance can be ensured.

Further, the cross member reinforcing member 43 is joined to the front floor panel 8 via the lower end of the central member member 41 in a vertical cross section along the vehicle front-rear direction, and has a cross-sectional shape forming a closed cross section with the central member member 41. The lower body structure of the electric vehicle 1 can further improve the rigidity of the second floor cross member 40 in the vicinity of substantially the center in the vehicle width direction. Therefore, the lower body structure of the electric vehicle 1 can secure more stable lateral collision performance without impairing the foot space of the occupant.

Further, the upper surface portion 43a of the cross member reinforcing member 43 includes front seat inner fixing portions 43h in which the rear legs of the front seat 18 are fixed at both ends in the vehicle width direction, and the front seat inner fixing portion 43h is provided in the vehicle width direction. In the vertical cross section along the above, the lower body structure of the electric vehicle 1 is provided with the front seat inner fixing portion 43h because the upper surface portion 43a is formed at substantially the same vertical position of the vehicle in the vehicle width direction. Even so, the ridge line along the front end and the ridge line along the rear end of the upper surface portion 43a of the cross member reinforcing member 43 can be formed in a substantially linear shape. Therefore, the lower body structure of the electric vehicle 1 can more efficiently transmit the collision load from the side of the vehicle from one side sill 7 to the other side sill 7 via the second floor cross member 40.

Further, the lower body structure of the electric vehicle 1 can suppress unevenness in the vehicle vertical direction on the upper surface portion 43a of the cross member reinforcing member 43, so that the height of the second floor cross member 40 can be suppressed and the cross can be suppressed. The moldability of the member reinforcing member 43 can be improved.
Therefore, the lower body structure of the electric vehicle 1 can secure the foot space of the occupant, the stable side collision performance, and the moldability of the second floor cross member 40.

Further, a console support bracket 60 having a long shape long in the front-rear direction of the vehicle and having front and rear portions connected to the vehicle body is provided, and the console support bracket 60 has a vertical cross section along the vehicle width direction in the vehicle width direction. It is formed in a substantially gate-shaped cross section having a pair of left and right bracket side wall portions 671 facing each other, and the bracket side wall portion 671 of the console support bracket 60 is fixed to the upward enlarged cross section 40a of the second floor cross member 40. The lower body structure of the electric vehicle 1 can suppress an increase in weight and secure even more stable lateral collision performance.

Specifically, since the upward enlarged cross-sectional portion 40a of the second floor cross member 40, which is long in the vehicle width direction, can be supported by the console support bracket 60 whose front and rear portions are connected to the vehicle body, the electric vehicle 1 can be supported. The lower vehicle body structure can improve the rigidity of the second floor cross member 40 in the vicinity of substantially the center in the vehicle width direction.

Further, since the bracket side wall portion 671 of the console support bracket 60 is fixed to the upward enlarged cross-sectional portion 40a, the lower body structure of the electric vehicle 1 has a lateral impact load acting on the second floor cross member 40 from the vehicle side. Can be distributed and transmitted in the front-rear direction of the vehicle via the console support bracket 60. Therefore, the lower body structure of the electric vehicle 1 can improve the rigidity of the vehicle interior floor surface with respect to the lateral impact load from the vehicle side.

In addition, since the bracket side wall portion 671 of the console support bracket 60 is not fixed to the front floor panel 8, the lower body structure of the electric vehicle 1 is such that the bracket side wall portion 671 of the console support bracket 60 is fixed to the front floor panel 8. The length of the bracket side wall portion 671 in the vehicle vertical direction can be shortened as compared with the case where the bracket side wall portion 671 is used. As a result, the lower body structure of the electric vehicle 1 can reduce the weight of the console support bracket 60 as compared with the case where the bracket side wall portion 671 is fixed to the front floor panel 8.
Therefore, the lower body structure of the electric vehicle 1 can suppress the increase in weight and secure more stable side collision performance.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The floor panel of the present invention corresponds to the front floor panel 8 of the embodiment.
Similarly below
The floor cross member corresponds to the second floor cross member 40,
The cross member body corresponds to the central member member 41 and the end member member 42.
The upper surface of the cross member main body corresponds to the member upper surface portion 41c of the central member member 41 and the member upper surface portion 42a of the end member member 42.
The floor frame corresponds to the floor frame lower 12
The central part of the member corresponds to the central member member 41.
The member end corresponds to the end member member 42 and
The upper surface of the cross member reinforcing member corresponds to the upper surface portion 43a of the cross member reinforcing member 43.
The seat fixing part corresponds to the front seat inside fixing part 43h,
The long member corresponds to the console support bracket 60 and
The side wall corresponds to the bracket side wall 671,
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the above-described embodiment, the bulging member 14 formed separately is joined to the front portion of the front floor panel 8, but the present invention is not limited to this, and the vehicle width direction in the front portion of the front floor panel 8 is not limited to this. The bulging member 14 may be integrally formed on the front floor panel 8 by bulging substantially the vicinity of the center above the vehicle.

Further, the kick-up reinforcing member 50 that connects the rear portion of the front floor panel 8 and the kick-up portion 9 is configured as a separate body, but the kick-up reinforcing member 50 is not limited to this, and the kick-up reinforcing member 50 is the front floor panel 8 or the kick-up. It may be integrally formed with the portion 9.

Further, the second floor cross member 40 is composed of a central member member 41, a pair of left and right end member members 42, and a cross member reinforcing member 43, but the present invention is not limited to this, and for example, the central member member 41 and the left and right are left and right. The second floor cross member may be integrally formed with the end member member 42. Alternatively, a second floor cross member in which the central member member 41 and the cross member reinforcing member 43 are integrally formed, or the central member member 41, a pair of left and right end member members 42, and the cross member reinforcing member 43 are integrally formed. May be.

Further, the console support bracket 60 in which the first support bracket 61 and the second support bracket 62 are fastened and fixed is used, but the present invention is not limited to this, and the console in which the first support bracket 61 and the second support bracket 62 are joined is not limited to this. It may be used as a support bracket.

Further, the console support bracket 60 is composed of the first support bracket 61 and the second support bracket 62, but the present invention is not limited to this, and the console support bracket in which the first support bracket 61 and the second support bracket 62 are integrally formed is formed. May be.

Further, the bulging member 14 which is the front vehicle body and the kick-up reinforcing member 50 which is the rear vehicle body are connected to the center console 3, the shift lever 4, and the console support bracket 60 which supports the shift lever support bracket 5 in the front-rear direction of the vehicle. Although they are connected, the present invention is not limited to this, and the bulging member 14 and the kick-up reinforcing member 50 may be connected in the vehicle front-rear direction with a long member that transmits a load in the vehicle front-rear direction.

1 ... Electric vehicle 7 ... Side sill 8 ... Front floor panel 12 ... Floor frame lower 18 ... Front seat 40 ... Second floor cross member 40a ... Upward enlarged cross section 41 ... Central member member 41c ... Member upper surface 42 ... End member member 42a ... Member upper surface 43 ... Cross member reinforcing member 43a ... Upper surface 43h ... Front seat inside fixing portion 60 ... Console support bracket 671 ... Bracket side wall

Claims (6)

It is a lower body structure of an electric vehicle that uses the output of a rotating electric machine as a driving force.
A pair of left and right side sills extending in the front-rear direction of the vehicle,
A substantially flat floor panel arranged between the side sills and
The left and right side sills are arranged in the vehicle width direction at a height lower than the height from the floor panel to the upper surface of the side sill while being arranged on the upper surface of the floor panel between the front seat and the rear seat where the occupant is seated. Equipped with a floor cross member that connects to
The floor cross member
In the vertical cross section along the vehicle width direction, the cross-sectional shape near the center of the vehicle width direction is expanded upward so that the upper surface is located above the vehicle surface with respect to the upper surface near the end in the vehicle width direction. Lower body structure of an electric vehicle equipped with a part. The floor cross member
A cross member main body that connects the left and right side sills and forms a closed cross section extending in the vehicle width direction with the floor panel.
It is fixed to the cross member main body and is composed of a cross member reinforcing member forming the upward enlarged cross section.
The cross member body
The lower body structure of the electric vehicle according to claim 1, which is formed in a shape that is substantially flat and has an upper surface that is substantially rectangular in a plan view. A pair of left and right floor frames that are arranged on the floor panel and extend in the front-rear direction of the vehicle in the vicinity of the side sill are provided.
The cross member body
The central part of the member located between the floor frames and
It is composed of a pair of left and right member ends located at both ends in the vehicle width direction at the center of the member.
The central part of the member
The lower body structure of an electric vehicle according to claim 2, which is composed of one member having a rigidity higher than the rigidity of the member end. The cross member reinforcing member
Claim 2 or claim 2 or a cross section formed in a vertical cross section along the vehicle front-rear direction, which is joined to the floor panel via the lower end of the cross member main body and has a closed cross section with the cross member main body. The lower body structure of the electric vehicle according to 3. The upper surface of the cross member reinforcing member
Seat fixing parts for fixing the rear legs of the front seats are provided at both ends in the vehicle width direction.
The seat fixing part
The invention according to any one of claims 2 to 4, wherein in a vertical cross section along the vehicle width direction, the vehicle is formed at substantially the same vertical position in the vehicle width direction on the upper surface of the upward enlarged cross section. Lower body structure of electric vehicle. It has a long shape that is long in the front-rear direction of the vehicle, and is equipped with a long member whose front and rear parts are connected to the vehicle body.
The long member
In the vertical cross section along the vehicle width direction, the cross section is formed in a substantially gate shape having a pair of left and right side wall portions facing the vehicle width direction.
The side wall portion of the long member
The lower body structure of an electric vehicle according to any one of claims 1 to 5, which is fixed to the upward enlarged cross section of the floor cross member.

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