Rear structure of electric vehicle

Abstract

The aim is to improve the flexibility of the drive unit's layout while ensuring the support rigidity of the drive unit. [Solution] The rear structure 100 of the electric vehicle includes a rear floor panel 1 positioned above the drive unit M, a pair of rear side members 2, 2, a plurality of motor mounts 7, and an intermediate member 3 positioned between the pair of rear side members 2, 2 and extending in the longitudinal direction of the vehicle along the lower surface of the rear floor panel 1. The rear floor panel 1 has an upper bulge 1a that bulges upward on the vehicle and a peripheral portion 1b that surrounds the upper bulge 1a. The intermediate member 3 is joined to a side wall adjacent portion 1b1 of the peripheral portion 1b that is along one side wall 1a3 in the vehicle width direction of the upper bulge 1a. The target motor mount 7x among the plurality of motor mounts 7 is supported by the intermediate member 3. The drive unit M is positioned at the rear of the vehicle below the upper bulge 1a and between one of the pair of rear side members 2, 2 and the intermediate member 3.

Description

Technical Field

[0006] , , , ,

[0001] The present invention relates to a rear structure of an electric vehicle.

Background Art

[0002] Patent Document 1 discloses a vehicle structure in which a motor unit for rear-wheel drive (hereinafter referred to as a drive unit) is disposed below a rear floor panel at the rear of the vehicle. In the vehicle structure disclosed in Patent Document 1, a rear suspension member for supporting a rear suspension for rear wheels is disposed below the rear floor panel, and the drive unit is mounted on the rear suspension member by being supported by three motor mounts fixed to the rear suspension member. This vehicle structure obtains a support rigidity capable of withstanding the weight of the drive unit by utilizing the rear suspension member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the drive unit is mounted on the rear suspension member as in the vehicle structure disclosed in Patent Document 1, the arrangement location of the drive unit is limited to the rear suspension member, and there is a possibility that the degree of freedom in the layout of the drive unit may decrease. <000…​​​​​​​​To achieve the above objective, according to one aspect of the present invention, there is a rear structure for an electric vehicle comprising: a rear floor panel disposed above a drive unit having a drive motor at the rear of the vehicle; a pair of rear side members extending in the longitudinal direction of the vehicle along the outer portion of the rear floor panel in the vehicle width direction; and a plurality of motor mounts supporting the drive unit, wherein the rear structure includes an intermediate member disposed between the pair of rear side members and extending in the longitudinal direction of the vehicle along the lower surface of the rear floor panel, the rear floor panel having an upper bulge that bulges upward toward the vehicle and a peripheral portion surrounding the upper bulge, the intermediate member being joined to a side wall adjacent portion of the peripheral portion along one side wall in the vehicle width direction of the upper bulge, the target motor mount among the plurality of motor mounts being supported by the intermediate member, and the drive unit being disposed at the rear of the vehicle below the upper bulge and between one of the pair of rear side members and the intermediate member. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to provide a rear structure for an electric vehicle that has a structure that can improve the degree of freedom in the layout of the drive unit while ensuring support rigidity that can withstand the weight of the drive unit at the rear of the vehicle. [Brief explanation of the drawing]

[0008] [Figure 1] This is a bottom view of the rear structure of an electric vehicle according to an embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the rear structure along line AA. [Figure 3] This is a perspective view of the rear structure, seen from above the vehicle. [Figure 4] This is a perspective view of the rear structure with the rear suspension frame removed, seen from below the vehicle. [Figure 5] This is a perspective view of the rear structure, with the drive unit, intermediate member, motor mount, and rear suspension frame removed, as seen from below the vehicle. [Figure 6] This is an enlarged lower view of the main part of the rear structure. [Figure 7] This is an enlarged perspective view of the key parts of the rear structure, seen from the underside of the vehicle. [Figure 8] This is an enlarged perspective view of the main part of the rear structure from which the target motor mount has been removed, viewed from the underside of the vehicle. [Figure 9] Figure 8 is a cross-sectional view of the main part of the rear structure along the BB line. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the attached drawings. Figures 1 to 4 are diagrams illustrating the rear structure 100 of an electric vehicle according to one embodiment of the present invention. Figure 1 is a bottom view of the rear structure 100, Figure 2 is a cross-sectional view of the rear structure 100 along line AA shown in Figure 1, Figure 3 is a perspective view of the rear structure 100 viewed from above the vehicle, and Figure 4 is a perspective view of the rear structure 100, with the rear suspension frame 8 (described later) removed, viewed from below the vehicle. In the figures, the direction of arrow Fr indicates the front in the vehicle's longitudinal direction, the direction of arrow U indicates the up in the vehicle's vertical direction, the direction of arrow R indicates the right side in the vehicle's width direction when the occupants inside the vehicle are facing forward, and the direction of arrow L indicates the left side in the vehicle's width direction when the occupants inside the vehicle are facing forward. In the following explanation, "front" and "rear" refer to the front and rear in the longitudinal direction of the vehicle, "up" and "down" refer to the up and down in the vertical direction of the vehicle, and "left" and "right" refer to the left and right in the vehicle width direction when the occupants inside the vehicle are facing forward.

[0010] Referring to Figures 1 to 4, the rear structure 100 of the electric vehicle in this embodiment includes a rear floor panel 1, a pair of rear side members 2, 2, an intermediate member 3, a rear skirt panel 4, a rear cross member 5, a towing hook 6, a plurality of motor mounts 7, and a rear suspension frame 8.

[0011] The rear structure 100 is applied to the rear structure of an electric vehicle driven by a drive unit M including a traction motor. In this embodiment, the electric vehicle is a four-wheel drive vehicle, and the drive unit M generates power to drive the rear wheels W. The drive unit M may also be called a motor unit.

[0012] In this embodiment, the drive unit M and the torsion beam type rear suspension frame 8 are located below the rear floor panel 1. The drive unit M is located at the rear of the electric vehicle, and the battery unit that supplies power to the drive unit M is located below the main floor panel, which is located in front of the rear floor panel 1. The rear floor panel 1, the pair of rear side members 2,2, the intermediate member 3, the rear skirt panel 4, the rear cross member 5, and the rear suspension frame 8 are each members formed mainly from thin metal sheets. The pair of rear side members 2,2, the intermediate member 3, and the rear cross member 5 each constitute part of the vehicle body structure (vehicle frame) and are members with higher rigidity compared to other elements.

[0013] The rear floor panel 1 is a panel member positioned above the drive unit M, which has a drive motor, at the rear of the vehicle. The rear floor panel 1 is located at the rear of the vehicle and constitutes the floor portion of the underside of the vehicle body. The length (width) of the rear floor panel 1 in the vehicle width direction is set to approximately correspond to the length (vehicle width) in the vehicle body direction.

[0014] The rear floor panel 1 has an upper bulge 1a that protrudes upward toward the vehicle and a peripheral portion 1b that surrounds the upper bulge 1a. In the illustrated example, the rear floor panel 1 has a vertical wall portion 1c that extends upward toward the vehicle along the outer side of the peripheral portion 1b in the vehicle width direction and a flange portion 1d that extends in the vehicle width direction along the upper end of the vertical wall portion 1c.

[0015] In the illustrated example, when viewed from one side in the vehicle up-and-down direction, the upper bulging portion 1a has a generally horizontally long rectangular outer shape. The upper bulging portion 1a is in a region closer to the rear side member 2 on one side in the vehicle width direction in the rear portion of the rear floor panel 1 (in the illustrated example, on the left rear side member 2 side), and bulges upward. The upper bulging portion 1a has a mountain-shaped cross-sectional shape with its top portion shifted toward the rear side. Specifically, the upper bulging portion 1a has a front wall 1a1, a rear wall 1a2, and a pair of left and right side walls 1a3, 1a3. The front wall 1a1 is inclined downward toward the front, and the rear wall 1a2 is inclined downward toward the rear. Each side wall 1a3 extends downward from each end in the vehicle width direction of the front wall 1a1 and the rear wall 1a2.

[0016] In the illustrated example, the peripheral portion 1b surrounds the entire circumference of the upper bulging portion 1a. The rear portion of the peripheral portion 1b bulges downward over the entire vehicle width direction of the rear portion. Referring to FIG. 2, the vertical height of the vertical wall portion 1c is lower than the bulging height of the upper bulging portion 1a from the front portion of the peripheral portion 1b. The flange portion 1d extends in the vehicle front-rear direction and the vehicle width direction above the rear side member 2. The top portion of the upper bulging portion 1a protrudes above the flange portion 1d (specifically, the upper surface of the rear side member 2).

[0017] The pair of rear side members 2, 2 extend in the vehicle front-rear direction along the outer side portions in the vehicle width direction of the rear floor panel 1 (specifically, the flange portion 1d), and are spaced apart from each other in the vehicle width direction. Each rear side member 2 is provided below the flange portion 1d and is joined to the flange portion 1d by spot welding or the like. Each rear side member 2 has, for example, a generally U-shaped cross-sectional shape that is open upward and extends in the vehicle front-rear direction. The upper bulging portion 1a occupies most of the region between the pair of rear side members 2, 2 in the rear floor panel 1 at the rear of the vehicle, and bulges upward over a wide range.

[0018] The intermediate member 3 is disposed between the pair of rear side members 2, 2 and extends in the vehicle front-rear direction along the lower surface of the rear floor panel 1. The intermediate member 3 is joined to the lower surface of the rear floor panel 1 by spot welding or the like and reinforces the rear floor panel 1.

[0019] The rear skirt panel 4 is a panel member that extends in the vehicle width direction along the rear end portion 1e of the rear floor panel of the rear floor panel 1. The rear skirt panel 4 extends left and right to the rear end portion of the rear side member 2, and at the rear of the vehicle, it extends in the vehicle width direction and the vehicle vertical direction over the entire width direction of the vehicle body. The lower end of the rear skirt panel 4 protrudes below the lower surface of the rear side member 2, and the upper end of the rear skirt panel 4 protrudes above the upper surface of the rear side member 2. Crash tubes 4a for shock absorption are joined to both outer side portions in the vehicle width direction of the rear surface of the rear skirt panel 4 so as to extend rearward from the rear portion of the rear side member 2. In FIG. 2, the rear skirt panel 4 is removed.

[0020] The rear cross member 5 is a member that extends in the vehicle width direction along the portion of the lower surface of the rear floor panel 1 that is forward of the upper bulging portion 1a and is joined to the rear floor panel 1, and connects the pair of rear side members 2, 2. In the illustrated example, the rear cross member 5 has a substantially hat-shaped cross-sectional shape that is open upward in the vehicle and extends in the vehicle width direction. The rear cross member 5 has a front flange 5a and a rear flange 5b, and each flange (5a, 5b) is joined to the lower surface of the rear floor panel 1 by spot welding or the like. Both end portions of the rear cross member 5 in the vehicle width direction are joined to the inner side portions in the vehicle width direction of the rear side member 2 by spot welding or the like.

[0021] The towing hook 6 is a member used during towing or transportation, and is provided at the rear of the vehicle so as to protrude below the lower surface of the rear floor panel 1. The towing hook 6 is formed into an appropriate shape by bending and curving a metal rod-shaped member (a round bar having a circular cross-sectional shape in the illustrated example).

[0022] The towing hook 6 has a front leg portion 6a and a rear leg portion 6b that are separated from each other in the longitudinal direction of the vehicle, and a curved portion 6c that connects the front leg portion 6a and the rear leg portion 6b and is curved to protrude downward from the vehicle. When viewed from one side in the vertical direction of the vehicle, the towing hook 6 extends linearly in the longitudinal direction of the vehicle. When viewed from one side in the width direction of the vehicle, the towing hook 6 protrudes downward. In the illustrated example, each leg portion (6a, 6b) extends linearly, and the curved portion 6c is formed in a U-shape that is generally open upward when viewed from one side in the width direction of the vehicle. While not particularly limited, the front leg portion 6a extends linearly in continuity with the front vertical bar portion of the curved portion 6c, and both the front leg portion 6a and the front vertical bar portion are inclined to approach the underside of the rear side member 2 as they move towards the front of the vehicle, and the rear leg portion 6b extends linearly in continuity with the rear vertical bar portion of the curved portion 6c, and both the rear leg portion 6b and the rear vertical bar portion extend generally vertically toward the underside of the rear side member 2.

[0023] The multiple motor mounts 7 are mounting members that support the drive unit M. Each motor mount 7 mainly consists of a metal member and a rubber member. In this embodiment, the multiple motor mounts 7 consist of a target motor mount 7x, a side motor mount 7a, and a front motor mount 7b. In other words, the rear structure 100 has three motor mounts 7 (7x, 7a, 7b). Each motor mount (7x, 7a, 7b) is supported by a vehicle body structural member (vehicle frame). The majority of each motor mount (7x, 7a, 7b) is made of a solid metal member and has relatively high rigidity. The placement of each motor mount (7x, 7a, 7b) will be described in detail later. Also, in the illustrated example, the side motor mount 7a and the front motor mount 7b are shown in their approximate shape.

[0024] The rear suspension frame 8 is a torsion beam type frame to which the rear wheels W are attached. The rear suspension frame 8 has a torsion beam 8a and a pair of trailing arms 8b, 8b. The rear suspension frame 8 forms a frame structure with the torsion beam 8a and the pair of trailing arms 8b, 8b.

[0025] The torsion beam 8a is a metal member that extends linearly in the vehicle width direction and applies torsional reaction forces to each of the left and right rear wheels W. The left end of the torsion beam 8a is joined to the middle section of the left trailing arm 8b, and the right end of the torsion beam 8a is joined to the middle section of the right trailing arm 8b.

[0026] The torsion beam 8a is positioned below the rear cross member 5, with a gap between them in the vertical direction of the vehicle, and is positioned so as to overlap with the rear cross member 5 in a plan view from below. The rear cross member 5 is positioned such that, in a plan view from below, the front of the rear cross member 5 overlaps with the rear of the torsion beam 8a. More specifically, the rear cross member 5 is positioned such that, in the longitudinal direction of the vehicle, the front end of the rear cross member 5 is located in front of the rear end of the torsion beam 8a, and the rear end of the rear cross member 5 is located behind the rear end of the torsion beam 8a.

[0027] Each trailing arm 8b extends generally below the rear side member 2 in the longitudinal direction of the vehicle. The front end of each trailing arm 8b is pivotably connected to the portion of the rear side member 2 that is forward of the rear cross member 5 via a rubber bushing. In addition, a spring support portion 8d is provided at the rear of the inner portion of the trailing arm 8b in the vehicle width direction, supporting the lower end of a coil spring 8c (see Figure 2), which has an upper end connected to the rear side member 2. The upper end of the coil spring 8c is connected to the rear side member 2 that is behind the rear cross member 5 and adjacent to the end of the rear cross member 5.

[0028] Next, the main parts of the rear structure 100 of the electric vehicle will be described. Figure 5 is a perspective view of the rear structure, with the drive unit M, intermediate member 3, motor mount 7, and rear suspension frame 8 removed, viewed from below the vehicle.

[0029] Referring to Figures 1, 4, and 5, the intermediate member 3 is joined to a side wall adjacent portion 1b1 along one side wall 1a3 in the vehicle width direction of the upper bulge portion 1a of the peripheral portion 1b of the rear floor panel 1. In the illustrated example, the side wall adjacent portion 1b1 of the peripheral portion 1b is adjacent to the right side wall 1a3 of the left and right side walls 1a3 of the upper bulge portion 1a, and extends to the right in the vehicle width direction from the lower end of the right side wall 1a3. In other words, in this embodiment, the right side wall 1a3 in the vehicle width direction of the upper bulge portion 1a corresponds to the "one side wall in the vehicle width direction of the upper bulge portion" according to the present invention.

[0030] Of the multiple motor mounts 7 (7x, 7a, 7b), the target motor mount 7x is supported by the intermediate member 3. In other words, in this embodiment, the target motor mount 7x, which is one of the three motor mounts 7 that support the drive unit M, is supported by the intermediate member 3.

[0031] The drive unit M is located at the rear of the vehicle, below the upper bulge 1a, and between one of the pair of rear side members 2,2 and the intermediate member 3. In this embodiment, the drive unit M is located below the upper bulge 1a in the area of ​​the rear of the rear floor panel 1 that is closer to the left rear side member 2, and is located between the left rear side member 2 of the pair of rear side members 2,2 and the intermediate member 3. In other words, in this embodiment, the left rear side member 2 corresponds to "one of the pair of rear side members" according to the present invention.

[0032] In this embodiment, the target motor mount 7x is supported by the intermediate member 3 as described above, the side motor mount 7a is supported by one of the rear side members 2 (i.e., the left rear side member 2 in this case), and the front motor mount 7b is supported by the rear cross member 5.

[0033] In the illustrated example, the rear right side of the drive unit M is supported by the target motor mount 7x, the rear left side of the drive unit M is supported by the side motor mount 7a, and the middle front part of the drive unit M is supported by the front motor mount 7b. In this way, the drive unit M is supported by the vehicle body structural members (2, 3, 5) below the rear floor panel 1, suspended at three points by the three motor mounts (7x, 7a, 7b). Specifically, each motor mount (7x, 7a, 7b) is fitted with a bush that supports a metal shaft extending from the drive unit M side, and the motor mounts (7x, 7a, 7b) support the drive unit M by supporting the shaft with the bush.

[0034] Referring to Figure 2, the upper part of the drive unit M is located between the pair of rear side members 2,2 at a height corresponding to the pair of rear side members 2,2, and the lower end of the drive unit M is located between the pair of trailing arms 8b,8b at a height corresponding to the rear of the pair of trailing arms 8b,8b. The space between the rear floor panel 1 and the rear of the rear suspension frame 8 is expanded in the vertical direction of the vehicle by the upper bulge 1a, and when viewed from one side in the vehicle width direction, most of the drive unit M, excluding the lower end of the drive unit M, is positioned between the rear floor panel 1 and the rear of the rear suspension frame 8, utilizing the space expanded by the upper bulge 1a.

[0035] In this embodiment, the front end 3a1 of the intermediate member 3 is joined to the rear cross member 5, and the rear end 3a2 of the intermediate member 3 is joined to at least one of the rear skirt panel 4 and the rear end 1e of the rear floor panel 1. Although not particularly limited, in the illustrated example, the rear end 3a2 of the intermediate member 3 is joined to the lower edge of the rear skirt panel 4. The intermediate member 3 extends in the longitudinal direction of the vehicle from the rear skirt panel 4 to the rear cross member 5 located in front of the upper bulge 1a, connecting the rear skirt panel 4 and the rear cross member 5.

[0036] In this embodiment, the rear structure 100 is a support bracket 9 joined to the intermediate member 3, and further includes a support bracket 9 to which the target motor mount 7x is attached. The target motor mount 7x is supported by the intermediate member 3 via the support bracket 9. The support bracket 9 is a member formed by press forming or the like from a thin metal sheet material.

[0037] The following describes in detail the main parts of the rear structure 100, mainly including the intermediate member 3, support bracket 9, and target motor mount 7x. Figure 6 is an enlarged bottom view of the main parts, Figure 7 is an enlarged perspective view of the main parts viewed from below the vehicle, Figure 8 is an enlarged perspective view of the main parts with the target motor mount 7x removed, viewed from below the vehicle, and Figure 9 is a cross-sectional view of the rear structure along the BB line shown in Figure 8. Note that in Figures 6 to 9, the drive unit M and rear suspension frame 8 have also been removed for the sake of explanation.

[0038] Referring mainly to Figures 6 to 9, in this embodiment, the intermediate member 3 has a projection 31 that protrudes downward from the vehicle, and the support bracket 9 is joined to at least the projection 31 of the intermediate member 3. In the illustrated example, the projection 31 protrudes downward from a position close to the rear end 1e of the rear floor panel 1. Therefore, the support bracket 9 is also positioned close to the rear end 1e of the rear floor panel.

[0039] The projection 31 has a bottom wall 31a, a front wall 31b, a rear wall 31c, an inner wall 31d, and an outer wall 31e. The bottom wall 31a is the wall that forms the bottom wall at the lowest end of the projection 31. The front wall 31b is inclined so that it approaches the rear floor panel 1 as it moves forward from the front end of the bottom wall 31a towards the front of the vehicle. The rear wall 31c extends from the rear end of the bottom wall 31a toward the rear floor panel 1. In the illustrated example, the rear wall 31c is not inclined and extends generally in the vertical direction. When viewed from one side in the front-rear direction of the vehicle, the projection 31 has a generally trapezoidal contour. The inner wall 31d is connected to the inner end in the vehicle width direction of the trapezoidal piece in a side view, which is made up of the front wall 31b, the bottom wall 31a, and the rear wall 31c, and the outer wall 31e is connected to the outer end in the vehicle width direction of the trapezoidal piece in a side view.

[0040] In this embodiment, the connection points of the support bracket 9 to the protrusion 31 are set to the inner wall 31d on the vehicle width side of the protrusion 31 and to either the front wall 31b or the rear wall 31c of the protrusion 31. In the illustrated example, the connection points of the support bracket 9 to the protrusion 31 are set to the inner wall 31d and the front wall 31b.

[0041] Specifically, the support bracket 9 has a first bracket piece 9a and a second bracket piece 9b. Each of the first bracket piece 9a and the second bracket piece 9b is made of a thin metal plate. The first bracket piece 9a is joined to the inner wall 31d facing inward in the vehicle width direction by spot welding or the like, and the second bracket piece 9b is joined to the front wall 31b facing diagonally downward on the vehicle side of the protrusion 31 by spot welding or the like. The first bracket piece 9a is positioned to protrude inward in the vehicle width direction from the inner wall 31d, and the second bracket piece 9b is positioned to protrude downward and forward from the front wall 31b. The inner wall 31d extends in directions intersecting the front wall 31b and the rear wall 31c, respectively. Therefore, by setting the joining points of the support bracket 9 to the protrusion 31 to the inner wall 31d and the front wall 31b, the support bracket 9 is joined to two surfaces of the protrusion 31 that extend in directions intersecting each other.

[0042] In this embodiment, the target motor mount 7x is fixed to the support bracket 9 and the intermediate member 3 at a plurality of fixing points extending from the support bracket 9 to the intermediate member 3. The plurality of fixing points include bracket-side fixing points P1 set on the support bracket 9 (first bracket piece 9a, second bracket piece 9b) and member-side fixing points P2 set on the intermediate member 3 at positions offset from the bracket-side fixing points P1 in the vehicle longitudinal direction and the vehicle vertical direction. In the illustrated example, there are two bracket-side fixing points P1, and the member-side fixing points P2 are set on the intermediate member 3 at positions offset from the two bracket-side fixing points P1 in the vehicle longitudinal and vehicle vertical directions.

[0043] Specifically, each bracket piece (9a, 9b) of the support bracket 9 has a mounting portion (9a1, 9b1) which has a seating surface against which the target motor mount 7x is attached. The mounting portions (9a1, 9b1) extend horizontally, and the seating surface faces downward. The target motor mount 7x is then fixed to the support bracket 9 (first bracket piece 9a, second bracket piece 9b) by fastening it to the mounting portions (9a1, 9b1) with fasteners such as bolts while in contact with the seating surface of each bracket piece (9a, 9b). Furthermore, the target motor mount 7x is fixed to the intermediate member 3 by fastening it with fasteners such as bolts at locations on the intermediate member 3 that are offset forward and upward relative to the mounting portions (9a1, 9b1) of the vehicle.

[0044] The bracket-side fixing points P1 are set at the mounting portion 9a1 of the first bracket piece 9a joined to the inner wall 31d and the mounting portion 9b1 of the second bracket piece 9b joined to the front wall 31b. The mounting portion 9b1 of the second bracket piece 9b is located in front of the vehicle and outward in the vehicle width direction relative to the mounting portion 9a1 of the first bracket piece 9a, but the seating surface (lower surface) of the mounting portion 9b1 is at the same height as the seating surface (lower surface) of the mounting portion 9a1. In other words, the front bracket-side fixing point P1 is offset outward in the vehicle width direction (to the right in the illustrated example) relative to the rear bracket-side fixing point P1, and the two bracket-side fixing points P1 are set at the same height relative to each other in the vertical direction.

[0045] The member-side fixing point P2 is set on the intermediate member 3 at a location that is forward of the second bracket piece 9b, adjacent to the second bracket piece 9b, and above the mounting portion 9b1 of the second bracket piece 9b.

[0046] More specifically, the target motor mount 7x has a mount body 7x1, a rear leg 7x2, an intermediate leg 7x3, and a front leg 7x4.

[0047] The mount body 7x1 constitutes the lower part of the target motor mount 7x. The mount body 7x1 has a through hole that penetrates in the vehicle width direction, and a cylindrical rubber bush 7x5 is fitted into this through hole. A metal shaft M1 extending from the drive unit M side is inserted into the bush 7x5. The target motor mount 7x supports the drive unit M by supporting the shaft M1 with the bush 7x5. The rear leg 7x2 extends rearward from the rear of the upper part of the mount body 7x1. The intermediate leg 7x3 protrudes outward in the vehicle width direction (to the right in the illustrated example) from the upper part of the mount body 7x1. The front leg 7x4 protrudes upward and forward from the front of the upper part of the mount body 7x1. The front leg 7x4 also protrudes outward in the vehicle width direction (to the right in the illustrated example) and is continuous with the front end of the intermediate leg 7x3. The front leg section 7x4 has a generally L-shaped cross-section and extends in the direction of the vehicle width.

[0048] The rear leg portion 7x2 is fixed to the mounting portion 9a1 (the first fixing point P1 on the rear side) of the first bracket piece 9a by fasteners such as bolts, while in contact with the seat surface of the mounting portion 9a1 (the first fixing point P1 on the rear side) of the second bracket piece 9b by fasteners such as bolts, while in contact with the seat surface of the mounting portion 9b1 (the first fixing point P1 on the front side) of the second bracket piece 9b. The front leg portion 7x4 is fixed to the member-side fixing point P2, which is set on the intermediate member 3 at a position offset forward and upward of the vehicle relative to the bracket-side fixing point P1, by fasteners such as bolts.

[0049] In this embodiment, the rear structure 100 further includes a lateral reinforcing member 10. The lateral reinforcing member 10 extends from the intermediate portion of the intermediate member 3 in the vehicle longitudinal direction in the opposite direction to the side of the upper bulge 1a in the vehicle width direction, and is a member that follows the rear floor panel 1, and is a member that connects the intermediate member 3 to the other rear side member 2 of the pair of rear side members 2,2 (the right rear side member 2 in the illustrated example). The lateral reinforcing member 10 is made of a thin metal plate and is joined to the intermediate member 3, the rear floor panel 1 and the right rear side member 2 by spot welding or the like. In other words, in this embodiment, the right rear side member 2 corresponds to the "other rear side member of the pair of rear side members" according to the present invention.

[0050] In this embodiment, the lateral reinforcing member 10 is joined to the intermediate member 3 at a position adjacent to at least one of the plurality of fixing points (the rear first fixing point P1, the front first fixing point P1, and the second fixing point P2) in the vehicle width direction. In the illustrated example, the lateral reinforcing member 10 is joined to the intermediate member 3 at a position adjacent to the second fixing point P2 of the intermediate member 3 in the vehicle width direction. More specifically, the lateral reinforcing member 10 is positioned adjacent to the front leg portion 7x4 of the target motor mount 7x in the vehicle width direction.

[0051] In this embodiment, the intermediate member 3 consists of a protruding portion 31 and a main body portion 32 to which the upper part of the protruding portion 31 is joined, and the main body portion 32 is joined to the rear floor panel 1. In this embodiment, the protruding portion 31 is formed by a member separate from the member forming the main body portion 32.

[0052] In the illustrated example, the main body 32 has a roughly hat-shaped cross-section that is open to the upper part of the vehicle and extends in the vehicle width direction. The main body 32 extends from the rear cross member 5 to the vicinity of the rear end 1e of the rear floor panel 1. The portion of the main body 32 rearward from the point of connection with the lateral reinforcing member 10 extends linearly in the vehicle longitudinal direction. The protruding portion 31 is joined to the main body 32 at a position close to the rear end of the main body 32, covering the rear part of the main body 32 from below. The front end of the main body 32, including the front end, is offset inward in the vehicle width direction (to the left in the illustrated example) relative to the aforementioned rear portion of the main body 32. In other words, the main body 32 is bent at a bent portion 32a provided in the middle of the main body 32 such that the front half of the main body 32 is offset inward in the vehicle width direction relative to the rear half of the main body 32. The point of connection of the lateral reinforcing member 10 to the intermediate member 3 is set at the bent portion 32a of the main body 32.

[0053] In this embodiment, the intermediate member 3 has an extension piece 33 that extends forward from the protruding portion 31. The extension piece 33 is continuous with the front end of the front wall 31b of the protruding portion 31 and extends along the lower surface of the main body portion 32. The extension piece 33 extends forward to a position corresponding to the front end of the lateral reinforcing member 10 and is joined to the main body portion 32 from below, overlapping it. The front leg portion 7x4 of the target motor mount 7x is fastened to the main body portion 32 via fasteners, with the extension piece 33 sandwiched between the upper surface of the front leg portion 7x4 and the lower surface of the main body portion 32. The second fixing point P2 is set at the location where the main body portion 32 and the extension piece 33 overlap.

[0054] In this embodiment, the front end of the projection 34, which consists of a projection 31 and an extension piece 33, is joined to the main body 32 and the lateral reinforcing member 10, and the rear end of the projection 34 is joined to at least one of the rear skirt panel 4 and the rear end 1e of the rear floor panel. The front end of the projection 34 is the portion of the projection 34 that includes the extension piece 33. In the illustrated example, the rear end of the projection 34 is the rear wall 31c of the projection 31 and also constitutes the rear end 3a2 of the intermediate member 3. Although not particularly limited, in the illustrated example, the rear end of the projection 34 is joined to the lower edge of the rear skirt panel 4.

[0055] Referring to Figures 3, 5, and 9, in this embodiment, the side wall adjacent portion 1b1 of the peripheral portion 1b of the rear floor panel 1 has a lower bulge portion 1f that is continuous with the rear of the side wall 1a3 of the upper bulge portion 1a (the right side wall 1a3 in the illustrated example) and bulges downwards towards the vehicle, and a front portion 1g that extends forward from the upper end of the front wall portion 1f1 of the lower bulge portion 1f. The intermediate member 3 is formed to conform to the shape of the side wall adjacent portion 1b1 in the range extending from the bottom wall portion 1f2 of the lower bulge portion 1f beyond the front wall portion 1f1 to the front portion 1g. In other words, the rear portion (bottom wall portion 1f2 of the lower bulge portion 1f) of the side wall adjacent portion 1b1 of the rear floor panel 1 is lower than the front portion (front portion 1g), and the front wall portion 1f1 constitutes a stepped portion connecting the bottom wall portion 1f2 and the front portion 1g. In the illustrated example, the upper part of the main body portion 32 of the intermediate member 3 is mainly formed to conform to the stepped shape of the side wall adjacent portion 1b1, including the stepped portion (front wall portion 1f1).

[0056] Furthermore, the first bracket piece 9a of the support bracket 9 is located behind the vehicle relative to the lower end of the front wall portion 1f1, and the second bracket piece 9b of the support bracket 9 is located in front of the vehicle relative to the lower end of the front wall portion 1f1. In other words, the target motor mount 7x is attached to the first bracket piece 9a and the second bracket piece 9b, and when viewed from one side in the vehicle width direction, it is positioned to straddle the stepped portion (front wall portion 1f1) formed in the side wall adjacent portion 1b1 of the rear floor panel 1 from front to back.

[0057] In this embodiment, the front leg portion 6a of the towing hook 6 is joined to the front wall 31b which is inclined upwards, and the rear leg portion 6b of the towing hook 6 is joined to the rear wall 31c. Specifically, the front leg portion 6a is inclined at an angle matching the inclination angle of the front wall 31b, extends along the front wall 31b, and is welded to the lower surface of the front wall 31b. The rear leg portion 6b extends along the rear wall 31c and is welded to the rear surface of the rear wall 31c. In other words, in the illustrated example, the towing hook 6 is positioned below the rear of the side wall adjacent portion 1b1 of the rear floor panel 1 by joining the front and rear legs (6a, 6b), which are the front and rear ends, to the front and rear walls (31b, 31c) of the projection portion 31 that protrudes downwards at the rear of the intermediate member 3. In addition, in the illustrated example, a cover plate 11 is joined to the rear wall 31c of the projection portion 31 and the rear skirt panel 4. Furthermore, the rear leg portion 6b of the towing hook 6 is joined to the rear wall 31c while being sandwiched between the rear wall 31c of the protruding portion 31 and the cover plate 11.

[0058] The rear structure 100 of the electric vehicle according to this embodiment includes an intermediate member 3 positioned between a pair of rear side members 2, 2 and extending in the longitudinal direction of the vehicle along the lower surface of the rear floor panel 1. The rear floor panel 1 has an upper bulge 1a that bulges upward on the vehicle and a peripheral portion 1b that surrounds the upper bulge 1a. The intermediate member 3 is joined to a side wall adjacent portion 1b1 of the peripheral portion 1b that is along one side wall 1a3 in the vehicle width direction of the upper bulge 1a, and the target motor mount 7x among the plurality of motor mounts 7 is supported by the intermediate member 3. Therefore, the rigidity of the rear floor panel 1 is increased by the upper bulge 1a and the intermediate member 3. Furthermore, since the target motor mount 7x is supported by the intermediate member 3 which is joined to the relatively rigid side wall adjacent portion 1b1 along the side wall 1a3 of the upper bulge 1a, the rear structure 100 can easily secure support rigidity at the rear of the vehicle that can withstand the weight of the drive unit M. Furthermore, the rear structure 100 can support the drive unit M at the rear of the vehicle below the upper bulge 1a and between one of the pair of rear side members 2,2 and the intermediate member 3, using at least the target motor mount 7x. Therefore, the drive unit M can be positioned below the rear floor panel 1 without being mounted on the rear suspension frame 8. Consequently, the degree of freedom in the layout of the drive unit M is increased compared to when the drive unit M is mounted on the rear suspension frame 8.

[0059] As described above, the rear structure 100 of the electric vehicle according to this embodiment has a structure that can improve the degree of freedom in the layout of the drive unit while ensuring support rigidity that can withstand the weight of the drive unit at the rear of the vehicle.

[0060] Furthermore, since the target motor mount 7x is supported by the intermediate member 3 joined to the side wall adjacent portion 1b1, the load acting on the target motor mount 7x is distributed over a wide area of ​​the rear floor panel 1. As a result, the elastic deformation of the intermediate member 3 and the rear floor panel 1 due to the load of the drive unit M can also be reduced.

[0061] In this embodiment, the target motor mount 7x is supported by the intermediate member 3 via a support bracket 9 joined to the intermediate member 3. This configuration makes it easy to ensure a support structure that corresponds to the shape of the target motor mount 7x by the shape of the support bracket 9, etc.

[0062] In this embodiment, the intermediate member 3 along the lower surface of the rear floor panel 1 has a protruding portion 31 that projects downwards from the vehicle, further increasing the rigidity of the floor structure at the rear of the vehicle and easily reducing the elastic deformation of the rear floor panel 1 due to the load of the drive unit M. Furthermore, since the support bracket 9 is joined to at least the protruding portion 31 of the intermediate member 3, the rigidity of the joint location of the support bracket 9 on the intermediate member 3 is increased by the protruding portion 31. As a result, the support rigidity of the support bracket 9 is improved, and consequently, the support rigidity of the target motor mount 7x and the drive unit M is also improved. In addition, since the rigidity of the target motor mount 7x is relatively high, by attaching the highly rigid target motor mount 7x to the protruding portion 31 via the support bracket 9, the rigidity of the surrounding structure of the protruding portion 31 is also efficiently improved by the target motor mount 7x.

[0063] In this embodiment, the connection points of the support bracket 9 to the protrusion 31 are set at the inner wall 31d and the front wall 31b of the protrusion 31. Therefore, the support bracket 9 is joined so as to surround the corner between the inner wall 31d and the front wall 31b of the protrusion 31. As a result, the rigidity of the support bracket 9 in the torsional direction with respect to the corner is improved, and consequently, the support rigidity of the target motor mount 7x and the drive unit M is improved more effectively.

[0064] In this embodiment, the target motor mount 7x is fixed to the support bracket 9 and the intermediate member 3 at a plurality of fixing points, including a bracket-side fixing point P1 set on the support bracket 9 and a member-side fixing point P2 set on the intermediate member 3 at a position offset from the bracket-side fixing point P1 in the vehicle longitudinal direction and the vehicle vertical direction. Therefore, the load of the drive unit M is effectively distributed to the vehicle body structure through the target motor mount 7x and the intermediate member 3, and the support rigidity of the target motor mount 7x and the drive unit M is more effectively improved.

[0065] In this embodiment, the front end of the intermediate member 3 is joined to the rear cross member 5, and the rear end of the intermediate member 3 is joined to at least one of the rear skirt panel 4 and the rear end 1e of the rear floor panel (the rear skirt panel 4 in the illustrated example). Therefore, the load of the drive unit M is effectively transmitted and distributed to the other vehicle body structure side through the intermediate member 3 and the rear cross member 5, and the support rigidity of the target motor mount 7x and the drive unit M is further improved. In addition, the elastic deformation of the rear floor panel 1 is further reduced.

[0066] In this embodiment, the intermediate member 3 and the other rear side member 2 of the pair of rear side members 2, 2 are connected by a lateral reinforcing member 10. Therefore, an annular structure is formed on the rear floor panel 1 by the rear side members 2, the intermediate member 3, the lateral reinforcing member 10, the rear cross member 5, etc., thereby more effectively improving the rigidity of the floor portion at the rear of the vehicle. The load of the drive unit M is efficiently distributed to the vehicle body structure side, such as the rear side members 2, through the lateral reinforcing member 10. As a result, the load on the intermediate member 3 is reduced, localized stress concentration on the rear floor panel 1 is prevented, and plastic deformation of the rear floor panel 1 can be prevented.

[0067] In this embodiment, the target motor mount 7x is fixed to the support bracket 9 and the intermediate member 3 at multiple fixing points extending from the support bracket 9 to the intermediate member 3, and the lateral reinforcing member 10 is joined to the intermediate member 3 at a position adjacent to at least one of the multiple fixing points in the vehicle width direction. Therefore, the lateral (vehicle width direction) load from the target motor mount 7x is more effectively distributed to the vehicle body structure via the lateral reinforcing member 10, and the support rigidity of the target motor mount 7x and the drive unit M is more effectively improved.

[0068] In this embodiment, since the protruding portion 31 is formed by a separate member from the member forming the main body portion 32, the strength and shape of the intermediate member 3 can be easily optimized, and it becomes easier to achieve both weight reduction and high rigidity in the intermediate member 3.

[0069] In this embodiment, the intermediate member 3 has an extension piece 33 that extends forward from the protrusion 31, the front end of the protruding body 34 consisting of the protrusion 31 and the extension piece 33 is joined to the main body 32 and the lateral reinforcing member 10, and the rear end of the protruding body 34 is joined to at least one of the rear skirt panel 4 and the rear end 1e of the rear floor panel (the rear skirt panel 4 in the illustrated example). Therefore, the load of the drive unit M is transmitted and distributed more effectively to the vehicle body structure such as the lateral reinforcing member 10 and the rear skirt panel 4.

[0070] In this embodiment, the side wall adjacent portion 1b1 of the peripheral portion 1b of the rear floor panel 1 has a lower bulge portion 1f that is continuous with the rear of the side wall 1a3 of the upper bulge portion 1a and bulges downward towards the vehicle, and a front portion 1g that extends forward from the upper end of the front wall portion 1f1 of the lower bulge portion 1f, and the intermediate member 3 is formed to conform to the shape of the side wall adjacent portion in the range from the bottom wall portion of the lower bulge portion 1f, beyond the front wall portion, to the front portion. Therefore, the panel rigidity of the side wall adjacent portion 1b1 to which the intermediate member 3 is joined is increased by the front wall portion 1f1 of the lower bulge portion 1f, and furthermore, the rigidity of the intermediate member 3 is also improved by the shape of the upper part of the intermediate member 3 conforming to the front wall portion 1f1 (step portion).

[0071] In this embodiment, the support bracket 9 has a first bracket piece 9a located behind the vehicle relative to the lower end of the front wall portion 1f1 of the lower bulging portion 1f of the side wall adjacent portion 1b1, and a second bracket piece 9b located in front of the vehicle relative to the lower end of the front wall portion 1f1. With this configuration, the target motor mount 7x is positioned to straddle the stepped portion (front wall portion 1f1) of the side wall adjacent portion 1b1 in the front-rear direction via the first bracket piece 9a and the second bracket piece 9b. As a result, the load of the drive unit M is effectively distributed in the front-rear direction of the vehicle via the target motor mount 7x and the support bracket 9, and the support rigidity and stable support of the target motor mount 7x are more effectively improved.

[0072] In this embodiment, the front leg portion 6a of the towing hook 6 is joined to the front wall 31b of the projection portion 31, and the rear leg portion 6b is joined to the rear wall 31c of the projection portion 31. This configuration increases the rigidity of the connection point of the towing hook 6 in the intermediate member 3 by the projection portion 31, thereby improving the mounting rigidity and support rigidity of the towing hook 6. The load acting on the towing hook 6 is efficiently distributed front to back between the front wall 31b and the rear wall 31c, and then widely distributed to the rear floor panel 1 via the intermediate member 3. As a result, stress concentration at the connection point between the towing hook 6 and the intermediate member 3 is reduced, and deformation of the towing hook 6 and the intermediate member 3 is more effectively reduced within the range of elastic deformation. In particular, since the front wall 31b to which the front leg portion 6a is joined is inclined upwards, the load that may act on the rear of the vehicle via the towing hook 6 due to shaking during transport can be received by the front wall 31b, which extends in a direction generally parallel to the input direction of the load. As a result, a portion of the load that may act during transport can be received in the shear direction, where the joint strength is relatively high, at the welded joint between the front wall 31b and the front leg 6a, thereby more effectively improving the mounting rigidity and support rigidity of the towing hook 6. In addition, the intermediate member 3 can be used as a support structure for the towing hook 6. If the intermediate member 3 is already positioned as a structure to support the towing hook 6, the intermediate member 3 will be used as a structure to support the target motor mount 7x.

[0073] In this embodiment, the multiple motor mounts 7 consist of a target motor mount 7x, a side motor mount 7a supported by one of the rear side members 2, and a front motor mount 7b supported by the rear cross member 5. Therefore, the rear structure 100 can stably support the drive unit M on the vehicle body structural members (2, 3, 5) in a configuration where it is suspended at three points by the three motor mounts (7x, 7a, 7b) without mounting it on the rear suspension frame 8.

[0074] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and further modifications and changes are possible based on the technical concept of the present invention.

[0075] For example, with respect to the intermediate member 3, the protruding portion 31 does not have to be formed by a separate member from the member forming the main body portion 32, and the protruding portion 31 may be formed integrally with the main body portion 32. Also, the intermediate member 3 does not have to have the protruding portion 31. Also, the towing hook 6 may be supported by a structure separate from the intermediate member 3. In this case, the protruding portion 31 does not have to be positioned near the rear end of the intermediate member 3, and may be positioned at an appropriate location depending on the location of the target motor mount 7x. The rear end portion 3a2 of the intermediate member 3 may be joined to the rear end portion 1e of the rear floor panel, or it may be joined to both the rear skirt panel 4 and the rear end portion 1e of the rear floor panel. Also, the intermediate member 3 does not have to extend to the rear cross member 5. The lateral reinforcing member 10 does not have to be provided. The number of bracket pieces of the support bracket 9 and the joining locations to the intermediate member 3 can be set as appropriate. Also, the rear structure 100 does not have to have the support bracket 9. In this case, the target motor mount 7x may be directly attached to the intermediate member 3.

[0076] Furthermore, the upper bulge 1a may bulge upward in an area shifted towards the right rear side member 2. In this case, the intermediate member 3 is shifted towards the left rear side member 2, the drive unit M is positioned between the intermediate member 3 and the right rear side member 2, and the lateral reinforcing member 10 connects the left rear side member 2 and the intermediate member 3. [Explanation of Symbols]

[0077] 1. Rear floor panel 1a Upper bulge 1a1 front wall 1a2 Back wall 1a3 side wall 1b Peripheral area 1b1 Side wall adjacent section 1c Vertical wall section 1d flange section 1e Rear floor panel rear end 1f lower bulge 1f1 Front wall 1f2 Bottom wall 1g front part 2,2 Pair of rear side members 3. Intermediate Members 3a1 Front end 3a2 Rear end 31 Protrusion 31a Bottom wall 31b front wall 31c back wall 31d interior wall 31e Exterior Wall 32 Main body 32a Bend part 33 Extension piece 34 Projection body 4 Rear skirt panel 4a crash tube 5 Rear cross member 5a Front flange 5b Rear flange 6 Towing Hooks 6a Front leg 6b Hind leg 6c Curved section 7 Motor Mount 7a Side motor mount 7b Front motor mount 7x Target Motor Mount 7x1 mount body 7x2 rear legs 7x3 middle leg 7x4 front legs 7x5 bushings 8 Rear suspension frame 8a Torsion beam 8b Trailing Arm 8c coil spring 8d Spring support 9 Support bracket 9a First bracket piece 9a1 Mounting part 9b Second bracket piece 9b1 Mounting part 10 Lateral reinforcing members 11 Cover Plate 100 Rear structure of electric vehicle M Drive Unit M1 shaft P1 Bracket side fixing point P2 Member-side fixed point W Rear wheel

Claims

1. A rear structure for an electric vehicle, comprising: a rear floor panel positioned above a drive unit having a drive motor at the rear of the vehicle; a pair of rear side members extending in the longitudinal direction of the vehicle along the outer side of the rear floor panel in the vehicle width direction; and a plurality of motor mounts supporting the drive unit, Including an intermediate member positioned between the pair of rear side members and extending in the longitudinal direction of the vehicle along the lower surface of the rear floor panel, The rear floor panel has an upper bulge that extends upward towards the vehicle, and a peripheral portion that surrounds the upper bulge. The intermediate member is joined to the portion adjacent to the side wall along one side wall in the vehicle width direction of the upper bulge of the peripheral portion, The target motor mount among the plurality of motor mounts is supported by the intermediate member, The rear structure of an electric vehicle is characterized in that the drive unit is located at the rear of the vehicle, below the upper bulge, and between one of the pair of rear side members and the intermediate member.

2. A support bracket joined to the intermediate member, further including a support bracket to which the target motor mount is attached, The rear structure of an electric vehicle according to claim 1, characterized in that the target motor mount is supported on the intermediate member via the support bracket.

3. The intermediate member has a protruding portion that extends downward from the vehicle, The rear structure of an electric vehicle according to claim 2, characterized in that the support bracket is joined to at least the protruding portion of the intermediate member.

4. The rear structure of an electric vehicle according to claim 3, characterized in that the connection point of the support bracket to the protrusion is set on the inner wall of the protrusion on the vehicle width side and on either the front wall or the rear wall of the protrusion.

5. The target motor mount is fixed to the support bracket and the intermediate member at multiple fixing points extending from the support bracket to the intermediate member. The rear structure of an electric vehicle according to claim 3, characterized in that the plurality of fixing points include bracket-side fixing points set on the support bracket and member-side fixing points set on the intermediate member at positions offset from the bracket-side fixing points in the vehicle longitudinal direction and the vehicle vertical direction.

6. A rear cross member extending in the vehicle width direction along the portion of the lower surface of the rear floor panel that is forward of the upper bulge, and joined to the rear floor panel, further including a rear cross member that connects the pair of rear side members, The rear structure of an electric vehicle according to claim 1, characterized in that the front end of the intermediate member is joined to the rear cross member, and the rear end of the intermediate member is joined to at least one of the rear skirt panel and the rear end of the rear floor panel, which extends in the vehicle width direction along the rear end of the rear floor panel, which is the rear end of the rear floor panel.

7. A lateral reinforcing member extending from the intermediate portion of the intermediate member in the vehicle's longitudinal direction in the opposite direction to the upper bulge in the vehicle's width direction, and along the rear floor panel, further including a lateral reinforcing member connecting the intermediate member and the other rear side member of the pair of rear side members, The target motor mount is fixed to the support bracket and the intermediate member at multiple fixing points extending from the support bracket to the intermediate member. The rear structure of an electric vehicle according to claim 2, characterized in that the lateral reinforcing member is joined to the intermediate member at a position adjacent to at least one of the plurality of fixing points in the vehicle width direction.

8. The intermediate member comprises the protruding portion and a main body portion to which the upper part of the protruding portion is joined, and which is joined to the rear floor panel. The rear structure of an electric vehicle according to claim 3, characterized in that the protruding portion is formed by a member separate from the member forming the main body portion.

9. A lateral reinforcing member extending from the intermediate portion of the intermediate member in the vehicle's longitudinal direction in the opposite direction to the upper bulge in the vehicle's width direction, and along the rear floor panel, further including a lateral reinforcing member connecting the intermediate member and the other rear side member of the pair of rear side members, The intermediate member has an extension piece that extends forward from the protrusion, The rear structure of an electric vehicle according to claim 8, characterized in that the front end of the projection body, which consists of the projection portion and the extension piece, is joined to the main body portion and the lateral reinforcing member, and the rear end of the projection body is joined to at least one of the rear skirt panel and the rear end of the rear floor panel, which extends in the vehicle width direction along the rear end of the rear floor panel, which is the rear end of the rear floor panel.

10. The portion adjacent to the side wall has a lower bulge portion that is continuous with the rear of the side wall of the upper bulge portion and bulges downward toward the vehicle, and a front portion that extends forward from the upper end of the front wall portion of the lower bulge portion. The intermediate member is formed to conform to the shape of the portion adjacent to the side wall in the range extending from the bottom wall portion of the lower bulge portion beyond the front wall portion to the front portion, The rear structure of an electric vehicle according to claim 1, characterized in that the support bracket has a first bracket piece located rearward of the vehicle relative to the lower end of the front wall and a second bracket piece located forward of the vehicle relative to the lower end of the front wall.

11. The intermediate member has a protruding portion that extends downward from the vehicle, A towing hook is attached to the aforementioned protruding portion. The protruding portion has a bottom wall, a front wall that slopes from the front end of the bottom wall toward the rear floor panel as it moves toward the front of the vehicle, and a rear wall that extends from the rear end of the bottom wall toward the floor panel. The towing hook has a front leg portion and a rear leg portion that are separated from each other in the longitudinal direction of the vehicle, and a curved portion that connects the front leg portion and the rear leg portion and protrudes downward from the vehicle, The rear structure of an electric vehicle according to claim 1, characterized in that the front leg portion is joined to the front wall and the rear leg portion is joined to the rear wall.

12. A rear cross member extending in the vehicle width direction along the portion of the lower surface of the rear floor panel that is forward of the upper bulge, and joined to the rear floor panel, further including a rear cross member that connects the pair of rear side members, The rear structure of an electric vehicle according to claim 1, characterized in that the plurality of motor mounts consist of the target motor mount, a side motor mount supported by one of the rear side members, and a front motor mount supported by the rear cross member.

Images