JP7255529B2 - electric vehicle undercarriage - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower structure of an electric vehicle that supports a vehicle front-rear rear portion, which is an output portion of a transmission, below a floor.

The vehicle longitudinal rear portion of the transmission is generally supported on a transmission cross member as disclosed in US Pat. The transmission cross member is attached so as to bridge the open lower part of the tunnel cross member that spans the left and right front side frames.

That is, the rear portion of the transmission in the longitudinal direction of the vehicle is supported only by the transmission cross member attached below the tunnel portion.

For this reason, there is a concern that sufficient support rigidity cannot be obtained for the rear portion of the transmission, for example, in the event of a frontal collision.

Japanese Patent No. 6546487

However, in an electric vehicle in which the battery unit is attached to the rear side of the transmission under the floor, if these support members are strengthened in order to increase the support rigidity of the transmission and the battery unit, the weight increases.

On the other hand, it is also necessary to solve the problem that the transmission moves backward in the event of a collision (head-on collision or oblique collision) and comes into contact with the battery unit, high-voltage equipment, and the like, damaging these parts.

In other words, it is required to maintain collision performance without increasing weight as much as possible.

SUMMARY OF THE INVENTION The main object of the present invention is to increase the support rigidity of a transmission with respect to the rear portion in the vehicle front-rear direction by utilizing a lateral frame attached to the vehicle body on the vehicle outer side in the vehicle width direction.

Means for this purpose is a lower structure of an electric vehicle in which a battery unit is attached to a vehicle front-rear direction rear side of a transmission disposed under a floor, and a vehicle front-rear direction rear portion of the transmission is supported under the floor, A rear portion of the transmission in the vehicle front-rear direction is supported by a transmission support member that connects tunnel portions that bulge upward in a substantially arch-like cross section at the center of the floor in the vehicle width direction and extend in the vehicle front-rear direction, and at least the tunnel portion is supported. A reinforcement member that is provided with lateral frames in the front and rear that crosses the left and right and is attached to the vehicle body outside the tunnel portion in the vehicle width direction, connects the front and rear lateral frames, and is arranged below the transmission support member. and wherein the transmission support member is supported by the reinforcing member.

In this configuration, the transmission support member that supports the rear portion of the transmission in the vehicle front-rear direction is supported by at least two lateral frames arranged in the front-rear direction and the reinforcement member that connects the frames. is enhanced.

In one aspect of the present invention, it is preferable that the reinforcing member includes an extended portion continuously extending between the front and rear lateral frames in the vehicle front-rear direction.

In this configuration, the support rigidity is increased by the extended portion, and the support and regulation of the transmission support member are ensured.

In one aspect of the present invention, the transmission support member may include a restricting portion that can be engaged with the extended portion when the transmission is retracted.

With this configuration, it is possible to suppress the rear portion of the transmission from moving in the vehicle width direction when the transmission moves backward during a frontal collision.

In one aspect of the present invention, the reinforcing member has a pair of side portions spaced apart laterally in the vehicle width direction in front of the reinforcing member in the vehicle front-rear direction, and these side portions are connected to each other by a connecting member extending in the vehicle width direction. configuration.

With this configuration, the rigidity of the reinforcing member can be increased, and if the transmission support member is supported by the connection member, the transmission support member can be stably supported.

In one aspect of the present invention, a vehicle front-rear direction front end portion of the reinforcement member is fixed to a rear end edge of the front lateral frame, and a vehicle front-rear direction rear end portion of the reinforcement member is fixed at the rear end of the lateral frame. It is preferable that the fixing member is fixed to the leading end edge of the lateral frame with a stopper that prevents the rear end of the reinforcing member in the vehicle front-rear direction from retreating on the upper surface side of the rear lateral frame.

In this configuration, the space between the front and rear lateral frames is strongly maintained by the reinforcing member and the fixing bracket, so that the support rigidity of the transmission support member can be enhanced from this point as well.

In one aspect of the present invention, a configuration may be adopted in which an inclined portion inclined obliquely upward is formed behind the vehicle front-rear direction front end portion of the reinforcing member.

With this configuration, the reinforcing member can be prevented from being exposed below the horizontal frame, and the transmission support member can be horizontally supported. In addition, since the transmission support member can be supported upward even a little, the height of the transmission support member can be increased when the transmission is retracted due to a head-on collision and the transmission support member is lowered.

According to the present invention, the reinforcing member is supported by the front and rear lateral frames with high rigidity, and the transmission supporting member is supported by this reinforcing member, so that the support rigidity for the rear portion of the transmission can be increased. As a result, even if the transmission moves backward due to a head-on collision, it is possible to prevent interference with other installation members such as a high-voltage unit.

1 is a schematic front view of a lower structure of an electric vehicle; FIG. The bottom view of the principal part of a lower structure. The perspective view which looked up at the frame member from the bottom. FIG. 4 is an end view showing a combined state of the horizontal frame and the vertical frame; FIG. 4 is a cut end view showing a fixed state of the horizontal frame; FIG. 4 is a perspective view of the separated state of the mission support member and the reinforcing member; FIG. 3 is an enlarged view of a main part of FIG. 2; Sectional drawing and a cut end elevation of the connection part of a reinforcement member and a transmission support member. FIG. 8 is a cut end view of the portion corresponding to AA of FIG. 7 in the lower structure; FIG. 8 is a cut end view of the portion corresponding to BB in FIG. 7 in the lower structure;

One mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic front view of the lower structure of an electric vehicle. This lower structure is an electric vehicle in which a battery unit 11a (see FIG. 2) is attached to the vehicle front-rear direction rear side of the transmission 12 arranged under the floor 11. It is a structure that increases the support rigidity of the rear portion (hereinafter abbreviated as “rear portion”).

The lower structure includes side sills 14, which are frame members having a closed cross section, at both ends in the vehicle width direction of a floor panel 13 that constitutes the floor 11. As shown in FIG. The side sill 14 extends in the longitudinal direction of the vehicle, and the upper end portion of the inner surface of the side sill 14 is joined to the joint portion 13a at the end of the floor panel 13 .

The floor panel 13 has a tunnel portion 13b in the center in the width direction of the vehicle, in which drive train components (not shown) are routed. The tunnel portion 13b bulges upward in a generally arch-shaped cross section and extends in the vehicle front-rear direction.

A pair of floor frames 15 are provided on the lower surface of the floor panel 13 and on the outer side in the vehicle width direction (outer side of the vehicle). Like the side sills 14, the left and right floor frames 15 are also frame members with closed cross sections and extend in the longitudinal direction of the vehicle.

As shown in FIG. 2, which is a bottom view of the essential parts of the lower structure, the floor frame 15 does not extend straight in the longitudinal direction of the vehicle, but bends in the longitudinal direction. The floor frame 15 will be described together with the mounting position to the floor panel 13. The floor frame 15 is located between the tunnel front end, which is the front end of the tunnel portion 13b in the vehicle front-rear direction, and the side sill front end, which is the front end of the side sill 14 in the vehicle front-rear direction. has a starting end at the position of

A floor frame 15 extending rearward from between the tunnel portion 13b and the side sill 14 in the vehicle width direction extends obliquely toward the outside of the vehicle, is connected to the side sill 14 at the rear thereof, and is along the side sill 14 at the rear of the connecting portion. straight. The points where the floor frames 15 are connected to the side sills 14 are cross members (a so-called No. 2 cross member on the front side (not shown) and a so-called No. 2 cross member on the rear side) disposed before and after connecting the floor frames 15 . 5 cross members (not shown)).

The transmission 12 is accommodated in the tunnel portion 13b, and the rear portion of the transmission 12, which is the output portion, is supported on the transmission support member 21 connecting the tunnel portions 13b.

A frame member 16 is provided below the transmission 12 to cover the lower surface. The frame member 16 is attached to the vehicle body.

The battery unit 11a attached to the rear side of the transmission 12 in the longitudinal direction of the vehicle is attached from below between the left and right floor frames 15 below the floor 11 as indicated by the phantom lines in FIG.

The battery unit 11a has two battery modules on the left and right sides corresponding to the vehicle width direction so as to sandwich a tunnel portion 13b. are united.

In the lower structure having the general structure as described above, the frame member 16 traverses the tunnel portion 13b in the left and right direction in the vehicle width direction, and the horizontal frame 61 attached to the vehicle body on the side of the tunnel portion 13b is mounted in the vehicle longitudinal direction. Be prepared before and after. In this example, the horizontal frame 61 is attached to the lower surface of the floor frame 15. As shown in FIG.

The frame member 16 has a reinforcing member 17 that connects the lateral frames 61 arranged in the front and rear and is arranged below the transmission supporting member 21. The reinforcing member 17 supports the transmission supporting member 21. there is

2 shows only the skeleton of the frame member 16 for the sake of convenience. In addition, the white arrows in FIG. 2 are for helping understanding of the drawing, and "Fr" and "Rr" in the arrows represent "front" and "rear" of the vehicle, respectively. Therefore, the direction connecting "Fr" and "Rr" is the longitudinal direction of the vehicle. The same applies to other figures.

First, the frame member 16 will be explained. FIG. 3 is a perspective view of the frame member 16 viewed obliquely from below. As shown in this figure, the frame member 16 has three horizontal frames 61 described above and vertical frames 62 on both left and right sides connecting them. The vertical frame 62 is positioned outside the floor frame 15 , and is configured such that the left and right ends of the connected horizontal frame 61 are positioned below the floor frame 15 .

A low-rigidity portion 62a having a lower rigidity in the vehicle width direction than the vertical frame 31 is integrally formed on the side surface of the vertical frame 62 on the outer side of the vehicle. The rigidity in the vehicle width direction is the rigidity that can withstand a compressive load input from the vehicle width direction. It is more likely than the frame 62 to be deformed to be crushed in the vehicle width direction.

The vertical frame 62 having such a low-rigidity portion 62a is made of an extruded material such as aluminum.

The vertical frame 62 is made of a member with a closed cross-section, and is specifically formed in the shape of a rectangular tube.

The horizontal frame 61 that connects the vertical frames 62 is made of a member with a closed cross-section like the vertical frame 62 and has a flat rectangular tubular shape. That is, the lateral frame 61 has a plate-like shape with a constant width in the direction corresponding to the longitudinal direction of the vehicle that is wider than the thickness in the vertical direction, has a hollow portion inside, and is open at both ends in the longitudinal direction. The vertical height of the horizontal frame 61 is significantly lower than the vertical height of the vertical frame 62 .

The horizontal frame 61 can also be made of an extruded material such as aluminum, like the vertical frame 62 .

In this example, three horizontal frames 61 are used and are connected to the vertical frame 62 via fasteners 63 below the low-rigidity portion 62a. Further, when connecting the horizontal frame 61 to the vertical frame 62, a mounting bracket 64 is used to span between them.

3, the mounting bracket 64 has a rear portion 64a having the same height as the vertical frame 62 and an end portion of the horizontal frame 61 at the lower end position. It has a stepped portion 64b and a supporting portion 64c which forms a triangle when viewed from the front-rear direction of the vehicle on the fitting stepped portion 64b. A vertical hole 64d is formed through the support portion 64c in the vertical direction. In addition, horizontal holes 64e are formed at two locations on the lower end of the back surface portion 64a, which are located on both sides of the positions corresponding to the vertical holes 64d.

Such a mounting bracket 64 is made of, for example, an aluminum material, and is fixed to the horizontal frame 61 by an appropriate means such as adhesion or welding.

As shown in FIG. 4, the mounting bracket 64 and the vertical frame 62 are fixed by bolts as fasteners 63 that pass through the horizontal holes 64e. That is, a nut 63a is fixed to the fitting stepped portion 64b of the mounting bracket 64, and a fastener 63 is inserted toward the horizontal hole 64e at a position below the low-rigidity portion 62a of the vertical frame 62 to perform fastening. . When the mounting bracket 64 and the vertical frame 62 are fixed to each other, the upper and lower surfaces of the mounting bracket 64 are flush with the upper and lower surfaces of the vertical frame 62, respectively.

The three horizontal frames 61 are fixed to portions near longitudinal ends and a longitudinal intermediate portion of a vertical frame 62 having a predetermined length, and the frame member 16 has a ladder shape as a whole.

Plate-shaped undercovers 65 and 66 are fixed to the lower surface of the frame member 16 . The undercovers 65 and 66 are formed separately on both sides in the vehicle width direction and fixed by appropriate means so as not to overlap the lower surface of the vertical frame 62 .

The frame member 16 constructed as described above is fixed to the vehicle body via the mounting bracket 64 .

The fixing position of the frame member 16 is the lower surface of the floor frame 15 as shown in FIG. 5, and is fixed by fastening. That is, a plurality of cup-shaped fixing portion forming members 18 are provided at positions on the floor frame 15 where the mounting brackets 64 of the frame members 16 are to be fixed. The fixing portion forming member 18 incorporates a nut 18a having a screw hole directed vertically, and an opening 18b is formed at a position corresponding to the screw hole of the nut 18a.

When fixing, the bolt 67 inserted through the horizontal frame 61 is inserted from below into the vertical hole 64 d of the mounting bracket 64 of the frame member 16 , and the upper surface of the mounting bracket 64 is in contact with the lower surface of the fixing portion forming member 18 . , the bolt 67 is screwed into the nut 18a.

The bolts 67 to be inserted through the horizontal frame 61 are installed only on the upper surface plate portion 61d constituting the upper surface of the horizontal frame 61, and are loosely attached to the portions of the lower surface plate portion 61e constituting the lower surface corresponding to the portions through which the bolts 67 are inserted. A hole 61f is formed.

Among the three horizontal frames 61 of the frame member 16, the reinforcing member 17 is provided between the front horizontal frame 61a at the frontmost position in the vehicle longitudinal direction and the intermediate horizontal frame 61b at the intermediate position. The rearmost lateral frame 61 in the longitudinal direction of the vehicle is a rear lateral frame 61c.

The reinforcement member 17 is made of a tubular body, and includes an extension portion 17a extending continuously across the front and rear horizontal frames 61, in this example, between the front horizontal frame 61a and the intermediate horizontal frame 61b. are fixed to the horizontal frame 61 via fixing metal fittings 71 and 72 .

As shown in the perspective view of FIG. 6 and bottom view of FIG. It has an inclined portion 74 extending outwardly of the vehicle and a side portion 75 extending straight rearward from the rear end of the inclined portion 74 . The inclined portion 74 is also inclined obliquely upward.

The side portions 75 are a pair of portions that are separated left and right in the vehicle width direction in front of the reinforcing member 17 in the vehicle front-rear direction. These side portions 75 are connected to each other by a connecting member 76 extending in the vehicle width direction.

The connecting member 76 has a belt-like shape in a plan view, and has fitting portions 76a in which the side portions 75 are fitted at both ends in the longitudinal direction, and two through holes 76b are provided in parallel between the fitting portions 76a. The through hole 76b is cut out at the rear in the vehicle front-rear direction and has a U shape in plan view.

Either the left or right inclined portion 74 and the side portion 75 are part of the extension portion 17a described above. The extended portion 17a is provided on the side on which the high-voltage device 11b (see FIG. 2) such as an inverter is arranged, among both sides in the vehicle width direction.

A portion behind the side portion 75 of the extension portion 17a is an extension portion 77, which extends linearly. The rear end of the extension portion 77 is bent at a right angle before reaching the intermediate horizontal frame 61b to form a rear end fixing portion 78 parallel to the front end fixing portion 73 described above. At the tip of the rear end fixing portion 78, there is an inclined end portion 79 that bends obliquely forward on the outside of the vehicle.

The reinforcing member 17 having such a shape has a front end fixing portion 73 fixed to the front lateral frame 61a and a rear end fixing portion 78 fixed to the intermediate lateral frame 61b (see FIG. 2).

A fixing metal fitting 71 for fixing the front end fixing portion 73 has an upper surface plate portion 71a that contacts the upper surface of the front lateral frame 61a and a lower surface plate portion 71b that contacts the lower surface. It has a retaining ring 71 c having a C-shaped cross section that connects the ends and surrounds the front end fixing portion 73 of the reinforcing member 17 . The upper surface plate portion 71a and the lower surface plate portion 71b are fastened together by bolts 71d that pass through the front lateral frame 61a from below.

The front end fixing portion 73 is fixed to the rear end edge of the front lateral frame 61a by such a fixing metal fitting 71. As shown in FIG.

The fixing bracket 72 that fixes the rear end fixing portion 78 has a pair of left and right fixing pieces 72a that contact the upper surface of the intermediate horizontal frame 61b, and a bulging support portion 72b that bulges upward between the fixing pieces 72a. there is The fixed piece 72a is fastened to the intermediate horizontal frame 61b by a bolt 72c penetrating from below. The bulging support portion 72b has a bulging height that increases toward the front, and has an annular holding portion 72d having a C-shaped cross section for holding the rear end fixing portion 78 at the front end.

The rear end fixing portion 78 is fixed to the upper surface side of the front end edge of the intermediate horizontal frame 61b by such a fixing metal fitting 72. As shown in FIG. The bulging support portion 72b having the annular holding portion 72d is a stopper that prevents the rear end fixing portion 78, which is the rear end portion of the reinforcing member 17 in the rear direction, from retreating. In other words, the reinforcing member 17 is fixed between the front lateral frame 61a and the intermediate lateral frame 61b so as to stretch.

The transmission support member 21 described above is supported at its upper portion by the vehicle body and at its lower portion by the reinforcing member 17, but is not fastened immovably but supported so as to be relatively movable. Specifically, the support portion of the transmission support member 21 to the vehicle body and the support portion to the reinforcing member 17 allow the transmission support member 21 to be detached rearward in the vehicle front-rear direction, but are not detachable in the vehicle width direction. Impossibly supported. That is, when the transmission support member 21 receives a load that causes the transmission support member 21 to relatively move rearward due to the occurrence of a head-on collision, the transmission support member 21 moves rearward and separates from the vehicle body and the reinforcement member 17 . are also supported so as not to move significantly in the vehicle width direction.

First, the support part for the reinforcement member 17 will be described.

That is, the transmission support member 21 has a lower end support portion 22 in the middle portion in the left-right direction, and the lower end support portion 22 is supported by the connecting member 76 . The lower end support portion 22 has two columnar protrusions 23 protruding downward, and each of these protrusions 23 is provided with one embedded bolt 24 protruding downward.

The embedded bolt 24 has a thickness corresponding to fitting into the through hole 76b formed in the connecting member 76 of the reinforcing member 17, while the size of the lower surface of the protrusion 23 is larger than the through hole 76b. Also, the interval between the embedded bolts 24 is the same as the interval between the through holes 76b.

When fixing, the connecting member 76 of the reinforcing member 17 fixed to the frame member 16 is moved toward the embedded bolt 24 of the transmission support member 21 fixed to the vehicle body side, and the through hole of the connecting member 76 is inserted into the embedded bolt 24. 76b is inserted. After that, as shown in FIGS. 8(a) and 8(b), the nut 24a is screwed from below onto the embedded bolt 24 protruding below the connecting member 76. Then, as shown in FIGS.

FIG. 8(a) is a cross-sectional view taken along the longitudinal direction of the connecting member 76 at the central position of the through hole 76b, and FIG. 8(b) is the same position as FIG. 8(a). FIG. 11 is an end view showing a state cut in a direction perpendicular to the longitudinal direction of the member 76; As indicated by phantom lines in FIG. 8(b), the embedded bolt 24 can come out rearward from the notch of the through hole 76b when a large collision load is applied.

Next, the supporting portion to the vehicle body will be explained. As shown in FIG. 6, the transmission support member 21 has mounting portions 25 extending upward on both left and right sides. It is the part that is fixed to the part. The mounting portion 25 is formed with three through holes 26 aligned in the front-rear direction. A through hole 26 is a portion into which a bolt 27 is inserted from below.

Contrary to the through hole 76b of the connecting member 76, all of these through holes 26 have a notch portion 26a forward in the vehicle front-rear direction, and the plan view shape of the through hole 26 is U-shaped (FIG. 7). reference).

On the other hand, at both left and right ends of the tunnel portion 13b, there are shown in FIG. 9, which is a cut end view of the lower structure taken along line AA in FIG. 7, and in FIG. As shown, a fixture forming member 81 is provided. Inside the fixing portion forming member 81, a nut 81a is built in with the screw hole facing up and down.

To fix the transmission support member 21 to the tunnel portion 13b, as shown in FIGS. is screwed into the nut 81a.

Of the left and right sides of the transmission support member 21, the obliquely upwardly inclined portion between the lower end support portion 22 and the mounting portion 25 on the same side as the side having the extension portion 17a of the reinforcing member 17 is the transmission support member 21. 12 is a restricting portion 28 that can be engaged with the extended portion 17a when retracted.

As described above, the restricting portion 28 is formed in such a shape that it abuts and interferes with the extension portion 17a to prevent further movement in the vehicle width direction. It may be formed into a shape with which it is concerned. For example, a hanging piece that hangs downward is provided at a portion corresponding to the above-described restricting portion 28, and a hole (through hole) or groove (inverted U-shaped notch) for fitting the extended portion 17a made of a tubular body into the hanging piece. is provided to restrain the hanging piece while holding the hanging piece and the extended portion 17a so as to be relatively movable in the longitudinal direction of the vehicle.

In the lower structure configured as described above, the lateral frame 61 is utilized to increase the support rigidity of the rear portion of the transmission 12 as follows.

That is, the transmission support member 21 that supports the rear portion of the transmission 12 is fixed to the vehicle body so as to connect the tunnel portions 13b, and is hung between the front lateral frame 61a and the intermediate lateral frame 61b that are arranged in the front-rear direction. They are supported by reinforcing members 17 that are passed over and connect them. Moreover, the front lateral frame 61 a and the intermediate lateral frame 61 b are attached to the vehicle body, specifically to the floor frame 15 . Therefore, the support rigidity of the rear portion of the transmission 12 is increased.

As a result, even if the transmission 12 moves backward due to a head-on collision, it is possible to prevent interference with other members provided in the lower structure.

Since the reinforcement member 17 has the extension portion 17a that extends continuously between the front side horizontal frame 61a and the intermediate horizontal frame 61b, high support rigidity can be obtained, and the transmission support member 21 can be reduced. Ensure support and regulation.

Moreover, the transmission support member 21 is provided with a restricting portion 28 that can be engaged with the extended portion 17a of the reinforcing member 17 when the transmission 12 is retracted, thereby suppressing the rear portion of the transmission 12 from moving in the vehicle width direction. . In particular, since the extended portion 17a is formed on the side where the high-voltage equipment 11b (see FIG. 2) is arranged, it affects the high-voltage equipment 11b as one of the other arrangement members. It is possible to suppress the occurrence of such a situation.

Further, since the connecting member 76 is provided in front of the reinforcing member 17 in the vehicle front-rear direction, the rigidity of the reinforcing member 17 can be increased. Stable support is possible.

Further, the front end fixing portion 73 of the reinforcing member 17 is fixed to the rear end edge of the front side horizontal frame 61a by the fixing metal fitting 71, and the rear end fixing portion 78 of the reinforcing member 17 is fixed to the upper side of the leading end edge of the intermediate horizontal frame 61b by the fixing metal fitting 72. is fixed with A stopper (a bulging support portion 72b having an annular holding portion 72d) is formed on the fixing metal fitting 72 for fixing the rear end fixing portion 78 to prevent the backward movement. Therefore, the reinforcing member 17 and the fixing metal fittings 71, 72 strongly maintain the distance between the front side horizontal frame 61a and the intermediate horizontal frame 61b, and from this point as well, the support rigidity of the transmission support member 21 can be enhanced.

In addition, since the rear inclined portion 74 of the front end portion of the reinforcing member 17 in the front-rear direction of the vehicle is inclined obliquely upward, the reinforcing member 17 can be prevented from being exposed below the horizontal frame 61, and the transmission supporting member 21 can be supported horizontally. In addition, since the transmission support member can be supported even slightly upward, the restricting portion 28 can be brought closer to the extended portion 17a. can be high

DESCRIPTION OF SYMBOLS 11... Floor 11a... Battery unit 11b... High-voltage apparatus 12... Transmission 13b... Tunnel part 15... Floor frame 17... Reinforcement member 17a... Extension part 21... Transmission support member 28... Regulation part 61... Horizontal frame 61a... Front side horizontal frame 61b...Intermediate horizontal frame 72...Fixing bracket 72d...Annular holding part 73...Front end fixing part 74...Inclined part 75...Side part 76...Connecting member 78...Rear end fixing part

Claims (6)

A lower structure for an electric vehicle in which a battery unit is attached to a vehicle front-rear direction rear side of a transmission disposed under a floor, and a vehicle front-rear direction rear portion of the transmission is supported under the floor,
A rear portion of the transmission in the vehicle front-rear direction is supported by a transmission support member that bulges upward in a substantially arch-like cross section at the center of the floor in the vehicle width direction and connects tunnel portions extending in the vehicle front-rear direction,
A horizontal frame is provided in the front and rear of the vehicle body and is attached to the vehicle body outside of the tunnel portion in the vehicle width direction and crosses at least the tunnel portion in the left and right directions,
a reinforcing member that connects the front and rear lateral frames and is arranged below the transmission support member;
A lower structure of an electric vehicle in which the transmission support member is supported by the reinforcing member. 2. The lower structure of an electric vehicle according to claim 1, wherein the reinforcing member includes an extension portion that extends continuously across the front and rear lateral frames in the vehicle front-rear direction. 3. The lower structure of an electric vehicle according to claim 2, wherein the transmission support member includes a restricting portion that can engage with the extended portion when the transmission is retracted. a pair of side portions spaced apart laterally in the vehicle width direction in front of the reinforcing member in the vehicle front-rear direction;
The lower structure of an electric vehicle according to any one of claims 1 to 3, wherein the side portions are connected to each other by a connecting member extending in the vehicle width direction. A vehicle front-rear direction front end portion of the reinforcing member is fixed to a rear edge of the front lateral frame, and
A rear end portion of the reinforcing member in the vehicle front-rear direction is fixed to a front end edge of the rear lateral frame with a fixing bracket,
5. The electric motor according to any one of claims 1 to 4, wherein the fixing bracket has a stopper on an upper surface side of the rear lateral frame for preventing the rear end portion of the reinforcing member in the vehicle front-rear direction from retreating. Vehicle undercarriage. 6. The lower structure of an electric vehicle according to any one of claims 1 to 5, wherein a sloped portion that slopes obliquely upward is formed behind a front end portion of the reinforcing member in the vehicle front-rear direction.

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