JP7375334B2 - Lower body structure of electric vehicle - Google Patents

Description

The present invention relates to a lower body structure of an electric vehicle including a console support bracket for supporting a console.

In general, electric vehicles that are not equipped with an internal combustion engine such as an engine for driving the vehicle do not have an exhaust pipe arranged below a floor panel, and therefore do not need to form a center tunnel portion.
Therefore, the floor cross member that connects the left and right side sills in the vehicle width direction can be formed in a straight line in the vehicle width direction, while a console support bracket is provided in place of the center tunnel section to support the console. There is a need. In this case, a structure may be considered in which both the left and right lower ends of the console support bracket extend downward to the floor panel, but such a structure would result in an increase in weight, so a structure that reduces weight is required.

By the way, Patent Document 1 discloses that, in an electric vehicle equipped with a battery unit in the lower part of the floor panel, a pair of left and right side sills extending in the longitudinal direction of the vehicle on both left and right sides of the lower part of the vehicle body, and A structure is disclosed that includes a tunnel portion that protrudes toward the interior and extends in the longitudinal direction of the vehicle, and a floor cross member that extends in the vehicle width direction to connect the central tunnel portion and left and right side sills.

Further, Patent Document 2 describes a pair of left and right side sills extending in the longitudinal direction of the vehicle at both left and right end portions of the floor panel, and a tunnel portion protruding upward at the center of the floor panel in the vehicle width direction and extending in the longitudinal direction of the vehicle. A structure is disclosed in which a floor cross member is provided and connects the left and right side sills in the vehicle width direction by straddling the upper part of the tunnel part.
However, in these patent documents 1 and 2, when providing a console support bracket, there is room for improvement in terms of weight reduction.

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

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lower body structure for an electric vehicle that can reduce the weight of a console support bracket and improve its support rigidity while improving side collision performance.

The lower body structure of an electric vehicle according to the present invention is a lower body structure of an electric vehicle, which includes a floor panel that forms the floor surface of the vehicle interior, and an upper part of the floor panel at the lower part of the front of the front seat that is aligned with the height of the side sill. The floor cross member includes a floor cross member arranged to extend in a straight line in the vehicle width direction between a pair of left and right side sills, and a console support bracket arranged above the center of the floor cross member to support a console. The cross member is provided with an enlarged upper cross-section section that expands upward to the height of the console support bracket at the upper center of the cross member, and for the enlarged upper cross-section section, the gate is provided with an upper wall and left and right side walls. The side wall of the console support bracket is fixed, and the floor cross member has an upper surface formed substantially in a straight line in the vehicle width direction, and the upper enlarged cross section is a cross section separate from the floor cross member. Left and right floor frames, which are made of member reinforcing members and extend in the longitudinal direction of the vehicle, are provided at the bottom of the floor panel, and the floor cross member portion between the left and right floor frames is located outside the floor frame in the vehicle width direction. It has higher rigidity than the parts located in and is formed from one piece .
According to the above configuration, the floor cross member extends in a straight line in the vehicle width direction between the pair of left and right side sills in accordance with the height of the side sills, so that side collision performance can be improved.

In addition, the upper central part of the floor cross member is equipped with an upwardly expanding section that expands upward to the height of the console support bracket, which improves side collision resistance and improves the bottom edge of the console support bracket. There is no need to extend the console support bracket downward to the floor panel, and it is possible to reduce the weight of the console support bracket and improve its support rigidity.

Furthermore, as mentioned above , since the side wall of the gate-shaped console support bracket, which has an upper wall and left and right side walls, is fixed to the upper enlarged cross section, the vertical height of the floor cross member and the upper enlarged cross section are fixed. The height of both side walls of the console support bracket can be reduced by the vertical height of the cross section, and the weight of the console support bracket can be reduced.

Furthermore, as described above, the upper surface of the floor cross member is formed in a substantially straight line in the vehicle width direction, and the upper enlarged cross section is formed by a cross member reinforcing member separate from the floor cross member. Therefore, since the upper enlarged cross section is formed separately from the floor cross member, the ridge line of the basic part of the floor cross member can be made into a straight line, and side collision performance can be improved.

Furthermore, as described above , left and right floor frames extending in the longitudinal direction of the vehicle are provided at the bottom of the floor panel, and the floor cross member portion between the left and right floor frames is located outside the floor frame in the vehicle width direction. Since it has higher rigidity than the parts between the left and right floor frames and is formed from a single piece, the outer parts of the floor cross member located on the outside in the vehicle width direction than the floor frames can absorb side collision energy, while also absorbing energy from side collisions. By forming the floor cross member portion, that is, the basic portion, of a single member, it is possible to improve side collision performance.

The part located outside the floor frame in the vehicle width direction is made of high-tensile steel plate (so-called high-tensile steel) with a plate thickness of 1.0 mm, and the floor cross member part between the left and right floor frames has a plate thickness of 1.8 mm. It may be made of ultra-high tensile strength steel plate .

In one embodiment of the present invention, fixing portions for the front portion of the front seat are formed on both sides of the upper enlarged cross section in the vehicle width direction at the same height as the upper enlarged cross section.
According to the above configuration, the ridge line of the upper enlarged cross section can be made straight in the vehicle width direction, and side collision performance can be improved, and the formability of the cross member reinforcing member can also be improved. I can do it.

Further, the lower body structure of an electric vehicle according to the present invention is a lower body structure of an electric vehicle, which includes a floor panel forming the floor surface of the vehicle interior, and an upper part of the floor panel at the lower part of the front of the front seat, which is aligned with the height of the side sill. a floor cross member arranged to extend in a straight line in the vehicle width direction between the pair of left and right side sills, and a console support bracket arranged above the center of the floor cross member to support the console, The floor cross member is provided with an enlarged upward cross-section section whose cross section expands upward to the height of the console support bracket at the upper center of the floor cross member, and an upper wall and left and right side walls for the upward enlarged cross-section section. The side wall of the gate-shaped console support bracket is fixed, the upper surface of the floor cross member is formed substantially in a straight line in the vehicle width direction, and the upper enlarged cross section is formed separately from the floor cross member. A shift lever support bracket is attached to the console support bracket formed of a cross member reinforcing member and above the floor cross member, and the upper surface of the console support bracket is supported from below on the upper surface of the cross member reinforcing member. A reinforcing support bracket is installed and fixed upright.
According to the above configuration, by providing the above-mentioned reinforcing support bracket, it is possible to improve the vertical rigidity of the upper enlarged cross section.

In one embodiment of the present invention, the shift lever support brackets are attached to the console support brackets on the left and right sides, and the reinforcement support brackets are formed in an M-shaped cross section when viewed from the front of the vehicle.
According to the above configuration, by forming the reinforcing support bracket into an M-shaped cross-section, the rigidity of the reinforcing support bracket itself is improved, which in turn improves the rigidity between the left and right support parts of the shift lever support bracket. can.

In one embodiment of the present invention, the reinforcement support bracket is attached to the cross member reinforcement member together with the console support bracket.
According to the above configuration, the cross member reinforcing member, the reinforcing support bracket, and the console support bracket are so-called co-tightened and fixed, so the spacing between the supporting parts of the reinforcing support brackets can be increased, and the supporting parts can be shared. can be achieved.

According to the present invention, it is possible to reduce the weight of the console support bracket and improve its support rigidity while improving side collision performance.

A perspective view showing a lower body structure of an electric vehicle according to the present invention Plan view of the lower body structure with the instrument panel and console removed A vertical cross-sectional view showing the lower body structure of an electric vehicle, cut vertically at approximately the center in the vehicle width direction. Perspective view of console support bracket Perspective view of tunnel section and reinforcement bracket Perspective view of standing bracket Perspective view of kick-up part reinforcement member Enlarged sectional view of main parts along line AA in Figure 3 Cross-sectional view of main parts along line BB in Figure 2 Enlarged sectional view of main parts in Figure 9 Cross-sectional view of main parts along line CC in Figure 2 Enlarged sectional view of main parts in Figure 11 A cross-sectional view of the main parts along line DD in Figure 2 Cross-sectional view taken along line E-E in Figure 8

The purpose of this project is to reduce the weight of the console support bracket and improve its support rigidity while improving side collision performance. A floor cross member is arranged at the lower part of the section so that the upper part of the floor panel is aligned with the height of the side sill, and extends in a straight line in the vehicle width direction between the pair of left and right side sills, and a floor cross member is arranged above the center of the floor cross member. a console support bracket for supporting a console, the floor cross member having an enlarged upper cross section whose cross section expands upward to the height of the console support bracket at the upper center of the floor cross member; The side wall of the gate-shaped console support bracket having an upper wall and left and right side walls is fixed to the floor cross member, and the floor cross member has an upper surface formed substantially in a straight line in the vehicle width direction. The upper enlarged cross section is formed by a cross member reinforcing member separate from the floor cross member, and left and right floor frames extending in the longitudinal direction of the vehicle are provided at the bottom of the floor panel, and the left and right floor frames are provided at the bottom of the floor panel. The floor cross member part between the two is more rigid than the part located on the outer side of the floor frame in the vehicle width direction, and is made of a single piece.

An embodiment of the present invention will be described in detail below based on the drawings.
The drawings show the lower body structure of an electric vehicle, FIG. 1 is a perspective view of the lower body structure, FIG. 2 is a plan view of the lower body structure with the instrument panel and console removed, and FIG. 3 is the lower body structure of the electric vehicle. FIG. 3 is a vertical cross-sectional view showing the lower vehicle body structure taken in the vertical direction approximately at the center in the vehicle width direction. Note that the lower body structure of the electric vehicle of the embodiment described below is substantially symmetrical on the left and right sides.

In FIGS. 1 and 2, a dash panel 1 is provided that partitions a motor room and a passenger compartment in the longitudinal direction of the vehicle, and an instrument panel 2 is arranged on the passenger compartment side of this dash panel 1 and in front of the front seats. There is. A steering column cover 3 in which a steering column and a steering shaft are provided is disposed on the driver's seat side of the instrument panel 2 (in this embodiment, the right front seat side in the vehicle width direction).
As shown in FIGS. 2 and 3, a substantially flat front floor panel 4 is connected to the lower rear end portion 1a of the dash panel 1 described above. This front floor panel 4 forms the floor surface of the vehicle interior.

As shown in FIG. 3, a battery device (so-called battery pack) 5 is disposed below the front floor panel 4 described above as a drive source for driving the vehicle by a motor. This battery device 5 includes a plurality of battery units 6, each of which constitutes a battery unit 6 using a plurality of battery bodies 6a. At a position corresponding to the lower part of the front floor panel 4, a plurality of battery units 6 are housed in a one-tiered structure, and at a position corresponding to the lower part of a rear floor pan 38, which will be described later, a plurality of battery units 6 are housed in a two-tiered structure. It is stored.

The above-mentioned battery device 5 also includes a battery tray 7 that supports a plurality of battery units 6 from below, and a battery that is attached to the upper surface of the external flange of the battery tray 7 and has each of the above-described battery units 6 built therein. A bulging portion 8a that bulges toward the tunnel portion 9 is integrally formed in the battery case 8 at a position corresponding to the partial tunnel portion 9 at the center in the vehicle width direction. .

As shown in FIGS. 2 and 3, tunnel-shaped portions 1b and 1c are formed in the central lower part of the dash panel 1 in the vehicle width direction so as to be continuous with the tunnel portion 9. As shown in FIGS.
As shown in FIG. 2, side sills 10, 10 having a closed cross-section structure extending in the longitudinal direction of the vehicle are bonded and fixed to both sides of the front floor panel 4 in the vehicle width direction.

4 is a perspective view of the console support bracket, FIG. 5 is a perspective view of the tunnel section and reinforcing bracket, FIG. 6 is a perspective view of the upright bracket, FIG. 7 is a perspective view of the kick-up section reinforcing member, and FIG. 9 is an enlarged sectional view of the main part along line AA, FIG. 9 is a sectional view of the main part along line BB in FIG. 2, FIG. 10 is an enlarged sectional view of the main part in FIG. 9, and FIG. 11 is C- in FIG. 2. 12 is an enlarged sectional view of the main part of FIG. 11, FIG. 13 is a sectional view of the main part along line DD of FIG. 2, and FIG. 14 is a sectional view of the main part of FIG. 8. It is an arrow sectional view.

As shown in FIG. 9, FIG. 11, and FIG. 13, the above-described side sill 10 has a side sill closed section extending in the longitudinal direction of the vehicle by joining and fixing a side sill inner 11, a side sill reinforcement 12, and a side sill outer 13. This is a vehicle body strength member having a section 14.

As shown in FIGS. 1 and 2, the floor frame upper 15 extends over the lower upper surface of the dash panel 1 and the upper surface of the front floor panel 4 at the intermediate portion in the vehicle width direction between the side sill 10 and the tunnel portion 9. are bonded and fixed. The upper floor frame 15 is a frame that has a hat cross-sectional shape and extends in the longitudinal direction of the vehicle. Between the upper floor frame 15 and the dash panel 1 and the front floor panel 4, there is a A cross section is formed.

As shown in FIGS. 9, 11, and 13, a floor frame lower 16 is bonded and fixed to the lower surface of the front floor panel 4 at an intermediate portion in the vehicle width direction between the side sill 10 and the battery device 5 described above. The floor frame lower 16 is a frame having an inverted hat cross-sectional shape and extending in the longitudinal direction of the vehicle. is formed.

As shown in FIG. 2, on the upper surface of the front floor panel 4 adjacent to the rear end of the tunnel portion 9, there is provided a front floor cross member that extends in a straight line in the vehicle width direction between the pair of left and right side sills 10, 10. A No. 2 cross member (so-called No. 2 cross member) 18 is provided. As shown in FIG. 9, the front cross member 18 aligns the upper part of the front floor panel 4 with the height of the upper surface of the side sill inner 11 at the lower part of the front of the front seat, and extends between the left and right side sills 10 in the vehicle width direction. It is bonded and fixed to the front floor panel 4 so as to extend in a straight line. As shown in FIG. 3, the front cross member 18 has a hat cross-sectional shape, and there is a closed cross section extending in a straight line in the vehicle width direction between the front cross member 18 and the front floor panel 4. A portion 19 is formed.
Further, as shown in FIG. 9, the front cross member 18 as a floor cross member has an upper surface formed substantially in a straight line in the vehicle width direction.

Furthermore, as shown in FIG. 9, the lower part of the front floor panel 4 is provided with left and right floor frame lowers 16, 16 extending in the longitudinal direction of the vehicle (however, in FIG. 9, the floor frame on the right side of the vehicle is (only the lower 16 is shown), and the above-mentioned front cross member 18 has an intermediate member 20 with a hat cross-section located between the left and right floor frame lowers 16, and a vehicle width wider than the floor frame lower 16. and a side member 21 having a hat-shaped cross section located on the outside in the direction.
The above-mentioned intermediate member 20 is made of an ultra-high tensile strength steel plate with a plate thickness of 1.8 mm, and the above-mentioned side member 21 is made of a high-tensile steel plate (so-called high-tensile steel material) with a plate thickness of 1.0 mm. There is.

That is, in the front cross member 18, the floor cross member portion between the left and right floor frame lowers 16 (intermediate member 20) has higher rigidity than the portion located on the outer side in the vehicle width direction than the floor frame lower 16 (side member 21). The intermediate member 20 is formed from one piece.

As shown in FIGS. 2 and 9, a seat mounting bracket 22, which forms a fixing portion 22a of the front portion of the front seat, is bonded and fixed to the upper part of the side member 21 of the above-mentioned front cross member 18.
As shown in FIG. 2, on the upper surface of the front floor panel 4 at a position spaced to the rear of the vehicle with respect to the above-mentioned front cross member 18, there is a line extending in a straight line in the vehicle width direction between the pair of left and right side sills 10, 10. An intermediate cross member (so-called No. 2.5 cross member) 23 is provided as a second floor cross member. This intermediate cross member 23 is provided so as to be parallel to the above-mentioned front cross member 18.

As shown in FIG. 13, the intermediate cross member 23 is joined to the front floor panel 4 above the front floor panel 4 at the lower part of the rear of the front seat so as to extend in a straight line in the vehicle width direction between the left and right side sills 10, 10. Fixed.
As shown in FIG. 3, the intermediate cross member 23 has a hat cross-sectional shape, and there is a closed cross section extending linearly in the vehicle width direction between the intermediate cross member 23 and the front floor panel 4. A portion 24 is formed.
As shown in FIG. 13, the above-mentioned intermediate cross member 23 is composed of an intermediate member 25 located at a position corresponding to the battery device 5, and a side member 26 located outside the battery device 5 in the vehicle width direction. .

Here, the intermediate member 25 described above is formed from an ultra-high tensile strength steel plate with a plate thickness of 1.8 mm, the side member 26 is formed from a high tensile strength steel plate with a plate thickness of 1.0 mm, and the intermediate member 25 is formed into the side member 26. On the other hand, it may be formed to have high rigidity. Moreover, the above-mentioned intermediate member 25 is formed from one member. Further, the side member 26 also serves as a seat mounting bracket, and a fixing portion 26a for the rear of the front seat is provided on its upper surface.

As shown in FIG. 3, the above-described front floor panel 4 is provided with an upright bracket 27 that is erected and fixed upward from the front floor panel 4.
As shown in FIGS. 6, 11, and 12, the upright bracket 27 has an M-shaped cross section when viewed from the front of the vehicle.

As shown in an enlarged cross-sectional view in FIG. 12, the above-mentioned upright bracket 27 includes two upper walls 27a, 27b, and outer leg parts 27c, 27d extending downward from the ends of these upper walls 27a, 27b in the vehicle width direction. The inner legs 27e, 27f, the intermediate bottom wall 27g connecting the lower ends of the inner legs 27e, 27f in the vehicle width direction, and the flange parts 27h, 27i extending outward from the lower ends of the outer legs 27c, 27d. , are integrally formed.
This upright bracket 27 has both sides and the middle portion indicated by the cross marks in FIG. 6, and more specifically, the flange portions 27h, 27i and the middle bottom wall 27g, which are fixed to the front floor panel 4 by spot welding or the like. .

Further, as shown in FIG. 6, a plurality of beads 28, 28, . The flange portions 27h, 27i and the intermediate bottom wall 27g are integrally formed at intervals, and the flange portions 27h, 27i and the intermediate bottom wall 27g are formed between the beads 28, 28 and between the bead 28 and the front and rear end surfaces of the upright bracket 27 (in FIG. (see X mark) is bonded and fixed to the front floor panel 4.

As shown in FIGS. 3 and 5, the above-mentioned tunnel portion 9 provided at the front center of the front floor panel 4 in the vehicle width direction is provided with a reinforcing bracket 30 having a gate-shaped cross section as a vehicle body component. As shown in FIG. 5, this reinforcing bracket 30 is integrally formed with an upper wall 30a and side walls 30b and 30c extending downward from both sides of the upper wall 30a in the vehicle width direction. The left and right side walls 30b and 30c are welded to the tunnel portion 9 (see the x mark in FIG. 5).

As shown in FIGS. 3 and 5, a rear rain 31 as a reinforcing member is provided on the rear lower surface of the reinforcing bracket 30 described above. As shown in FIG. 3, immediately before the rear rain 31, the upper wall 30a of the reinforcing bracket 30 and the upper wall of the tunnel portion 9 are connected by a connecting bracket 32 that is approximately Z-shaped in side view. .

On the other hand, as shown in FIGS. 2, 3, 7, and 14, a kick-up portion reinforcing member 34 for reinforcing the kick-up portion 33 is provided at the rear center of the front floor panel 4 in the vehicle width direction.
As shown in FIG. 7, the kick-up portion reinforcing member 34 includes an upper wall 34a, left and right side walls 34b, 34b extending downward from both sides of the upper wall 34a in the vehicle width direction, and extending downward from the front end of the upper wall 34a. The front wall 34c includes a front wall 34c extending from the side wall 34b and a flange portion 34d integrally formed to extend outward from the lower ends of the side wall 34b and the front wall 34c.

As shown in FIG. 3, the upper wall 34a of the kick-up portion reinforcing member 34 is provided with an opening 34e, and the upper wall 34a is provided with a cover member 35 that removably covers the opening 34e. It is being
As shown in FIG. 3, the above-described kick-up portion 33 extends upward and then extends toward the rear of the vehicle from its upper end, and at the bottom of the kick-up portion 33 is a rear cross member 36 ( A so-called No. 3 cross member) is joined and fixed, and a closed cross-section portion 37 extending in the vehicle width direction is formed between the rear cross member 36 and the kick-up portion 33.
As shown in FIG. 3, a rear floor pan 38 extending rearward is connected to the kick-up portion 33 described above.

In FIG. 2, reference numeral 39 denotes a rear side frame having a closed cross-section structure extending in the longitudinal direction of the vehicle on both sides of the rear floor pan 38 in the vehicle width direction.As shown in FIG. It extends to the rear of the vehicle so as to overlap with the front end of No. 39.

As shown in FIGS. 2 and 3, a console support bracket 40 is provided as a vehicle component extending in the longitudinal direction of the vehicle from the rear part of the reinforcement bracket 30, which is a vehicle body member on the upper part of the tunnel part 9, to the front part of the kick-up part reinforcement member 34. There is. The console support bracket 40 is a bracket that is disposed above the center of the front cross member 18 in the vehicle width direction, above the standing bracket 27, and above the center of the intermediate cross member 23 in the vehicle width direction, and supports the console 70. .

As shown in FIG. 3, the above-described console 70 includes a shift lever support bracket 73 that supports a shift lever 72 having a shift knob 71 at its upper part and whose lower part is fixed to the console support bracket 40 in the front and rear.

As shown in FIG. 3, the above-mentioned shift lever support bracket 73 is an integral structure of an upper bracket 74 that supports the shift lever 72, an intermediate bracket 75, and a base bracket 76.
The console 70 described above is entirely covered with an exterior member 77, and the front side of the base bracket 76 is set as a front console 70F, and the side behind the base bracket 76 is set as a rear console 70R.

As shown in FIG. 3, a cup holder 78 is formed at the upper part of the rear console 70R immediately behind the base bracket 76, and a storage section 79 formed at the rear of the cup holder 78 can be opened and closed by an armrest 80. It is configured to cover.

As shown in FIG. 9, the cross section expands upward to the height of the console support bracket 40 at the upper center of the front cross member 18 in the vehicle width direction, specifically, at the upper center of the intermediate member 20 in the vehicle width direction. An enlarged upper cross section 41 is formed. In this embodiment, the enlarged upper cross section 41 is formed by a cross member reinforcing member 42 that is separate from the front cross member 18.
Thereby, the ridge lines X1 and X2 (see FIG. 14) of the basic portion of the front cross member 18 are configured to be aligned in a straight line in the vehicle width direction.

As shown in FIGS. 9 and 14, the cross member reinforcing member 42 includes an upper wall 42a, a front wall 42b, a rear wall 42c, left and right side walls 42d, 42e, and flanges extending outward in the vehicle width direction from the side walls 42d, 42e. As shown in FIG. 14, the front wall 42b and rear wall 42c are joined and fixed to the front and rear walls of the front cross member 18, and the flange portions 42f and 42g are shown in FIG. It is fixed to the upper wall of the front cross member 18 as shown in FIG.

As shown in FIG. 10, the console support bracket 40 described above includes an upper wall 40a, left and right side walls 40b, 40c, and flange portions 40d, 40e extending outward in the vehicle width direction from the lower ends of the side walls 40b, 40c. Side walls 40b and 40c of the console support bracket 40 are fixed to an upper wall 42a of a cross member reinforcing member 42 forming an enlarged upper cross section 41 via flanges 40d and 40e.

Further, as shown in FIG. 4, a downwardly recessed recess 40f is integrally formed in the center portion of the upper wall 40a of the console support bracket 40 in the vehicle width direction. This recessed portion 40f extends in the longitudinal direction of the vehicle from the front end to the vicinity of the rear end of the console support bracket 40, and due to the formation of this recessed portion 40f, a plurality of ridge lines 40g and 40h extending in the longitudinal direction are formed on the upper wall 40a of the console support bracket 40. , 40i, 40j, 40k are formed.

As shown in FIGS. 9 and 10, in this embodiment, the left and right flanges 40d and 40e of the console support bracket 40 are cross-linked together with a reinforcing support bracket 51, which will be described later, using fastening members 43 such as bolts and nuts. They are fastened together to the upper wall 42a of the member reinforcing member 42.

As shown in FIG. 9, on both sides in the vehicle width direction of the upper wall 42a of the cross member reinforcing member 42 forming the upper enlarged cross section 41, there is a fixing portion at the front of the front seat at the same height as the upper enlarged cross section 41. That is, seat fixing parts 44, 44 are formed. Thereby, the ridgelines X3 and X4 of the upper enlarged cross-sectional portion 41 (that is, the ridgeline of the cross member reinforcing member 42) are configured to be aligned in a straight line in the vehicle width direction. The front parts of seat slide rails 46, 46 are attached to the seat fixing part 44 and the fixing part 22a of the front seat front part of the seat mounting bracket 22 using mounting members 45, 45, and the seat slide rails A front seat 47 (in this embodiment, a driver's seat) is arranged above the seats 46, 46. Note that FIG. 9 shows a seat cushion 47C of the front seat 47.

As shown in FIGS. 4 and 10, a front rain 48 is provided as a reinforcing member for reinforcing the front part of the console support bracket 40 from its lower surface.
As shown in FIG. 10, the front rain 48 is formed in a portal-shaped cross section that reinforces the upper wall 40a and the left and right side walls 40b, 40c of the console support bracket 40. As shown in FIG.

As shown in FIGS. 9 and 10, a mounting member 50 consisting of a mount rubber 49 and bolts and nuts is attached to the console support bracket 40 above the front cross member 18 in front of the base bracket 76 of the shift lever support bracket 73. A reinforcing support bracket 51 is erected and fixed on the upper surface of the cross member reinforcing member 42 to support the upper surface of the console support bracket 40, that is, the upper wall 40a from below.

As shown in FIG. 10, flange portions 76a, 76b are integrally formed on the lower left and right sides of the base bracket 76 in the shift lever support bracket 73, and these flange portions 76a, 76b are mounted on the upper surface of the mount rubber 49. By fastening with the member 50, the shift lever support brackets 73 are attached to the console support brackets 40 on the left and right sides.

As shown in FIGS. 9 and 10, the above-mentioned reinforcing support bracket 51 has an M-shaped cross section when viewed from the front of the vehicle, and as shown in FIG. 10, the left and right flange portions 51a, 51 b is attached to the upper wall 42 a of the cross member reinforcing member 42 using a fastening member 43 together with the flange portions 40 d and 40 e of the console support bracket 40 .

Further, the reinforcement support bracket 51 having an M-shaped cross section has two upper walls 51c and 51d, and each of these upper walls 51c and 51d, together with the front rain 48 and the console support bracket 40, are made of three layers. Together, they are fastened together.

As shown in FIG. 13, which is a cross-sectional view taken along line DD in FIG. ing. As shown in FIG. 14, this cross member reinforcing member 52 has a hat cross-sectional shape, and an upwardly enlarged cross-sectional portion 53 is formed above the closed cross-sectional portion 24 in this cross member reinforcing member 52.

As shown in FIG. 14, the intermediate cross member 23, which is the second floor cross member, is formed lower than the height of the console support bracket 40 at the rear of the upright bracket 27, and as shown in FIG. The support bracket 40 has a gate-shaped cross section when viewed from the front of the vehicle, and its side walls 40b and 40c are attached to the intermediate cross member 23 via a cross member reinforcing member 52.

Specifically, as shown in FIG. 13, the left and right side walls 40b, 40c of the console support bracket 40 are attached to the upper wall of the cross member reinforcing member 52 via flange portions 40d, 40e. The above-mentioned flange portions 40d and 40e are fastened and fixed to the cross member reinforcing member 52 using fastening members 54 such as bolts and nuts.

As shown in FIG. 13, a fixing part for the rear of the front seat, that is, a seat fixing part 55 is formed on both sides in the vehicle width direction of the cross member reinforcing member 52 that forms the upper enlarged cross-sectional part 53, and this seat fixing part The rear portions of the seat slide rails 46, 46 are attached to the portion 55 and the fixing portion 26a of the side member 26 at the rear of the front seat using attachment members 56, 56.

As shown in FIGS. 3 and 14, the shift lever support bracket 73 described above is a bracket that supports the shift lever 72, and as shown in FIG. It is fixed across the upper cross member reinforcing member 42 and the front part of the upright bracket 27.

As already described with reference to FIGS. 9 and 10, the front fixing portion of the shift lever support bracket 73 is attached to the cross member reinforcing member 42 on its left and right sides using the mount rubber 49 and the attachment member 50. As shown in FIGS. 11 and 12, the fixed portion on the rear side of the shift lever support bracket 73 has left and right flange portions 76a, 76b of the base bracket 76, which are used to attach mount rubbers 57, 57 and bolts, nuts, etc. It is attached to the upper walls 27a, 27b of the upright bracket 27 using the member 58 and via the console support bracket 40.

As shown in FIG. 14, the upright bracket 27 is formed to extend further toward the rear of the vehicle from the rear mounting portion of the shift lever support bracket 73 (see the positions of the mount rubber 57 and the mounting member 58). The upper wall 40a of the console support bracket 40 is fixed to the upright bracket 27 behind the attachment portion of the shift lever support bracket 73 using attachment members such as bolts and nuts (not shown).
As shown in FIGS. 11 and 12, the upper part of the upright bracket 27 is formed narrower in the vehicle width direction than the width of the console support bracket 40 in the vehicle width direction.

By the way, as shown in FIGS. 8 and 5, the console support bracket 40 (vehicle part) is connected to the tunnel part 9 via the reinforcement bracket 30 (vehicle body part), and the console support bracket 40 and the reinforcement bracket 30 are , the upper walls 40a, 30a and the side walls 40b, 40c, 30b, 30c, including the front rain 48 and the rear rain 31, are stacked and fastened together via fastening members.

That is, as shown in FIG. 8, on the upper side, the upper wall 40a of the console support bracket 40, the front rain 48, the upper wall 30a of the reinforcing bracket 30, and the rear rain 31 are connected with bolts and nuts. The side walls 40b and 40c of the console support bracket 40, the front rain 48, the side walls 30b and 30c of the reinforcing bracket 30, and the rear rain 31 are fastened together by fastening members 59 such as are fastened together using fastening members 60 such as bolts and nuts.
As shown in FIGS. 1, 3, and 8, a bottom console 81 is provided between the lower front end of the front console 70F and the lower part of the instrument panel 2. As shown in FIGS.

As shown in FIG. 8, the bottom console 81 includes a bottom wall 81a located at the center in the vehicle width direction, an inner wall 81b rising upward from both left and right ends of the bottom wall 81a in the vehicle width direction, and a bottom wall 81b extending downward from the upper end of the inner wall 81b. The bottom console 81 covers the front part of the console support bracket 40 and the reinforcing bracket 30 from above.

Furthermore, as shown in FIGS. 3, 4, and 8, a mounting bracket 61 having a gate-shaped cross section is provided on the rear upper side of the console support bracket 40, and a mount rubber 62 and bolts, nuts, etc. are attached to the mounting bracket 61. The mounting member 63 is used to attach the bracket 82 on the rear console 70R side.
In the figure, arrow F indicates the front of the vehicle, and arrow R indicates the rear of the vehicle.

As described above, the lower body structure of the electric vehicle of the above embodiment is a lower body structure of an electric vehicle, and includes a floor panel (see front floor panel 4) forming the cabin floor surface and a lower part of the front part of the front seat. A floor cross member (front cross member 18 ) and a console support bracket 40 disposed above the center of the floor cross member (front cross member 18) to support the console 70, The upper part is provided with an upwardly enlarged cross-sectional part 41 whose cross-section expands upward to the height of the console support bracket 40 (see FIGS. 9 and 10).

According to this configuration, the floor cross member (front cross member 18) extends in a straight line in the vehicle width direction between the pair of left and right side sills 10, 10 to match the height of the side sills 10, 10, so that Performance can be improved.

In addition, the upper central portion of the floor cross member (front cross member 18) is provided with an upwardly enlarged cross-section portion 41 whose cross-section expands upward to the height of the console support bracket 40, thereby improving side collision resistance. In addition, it is no longer necessary to extend the lower end of the console support bracket 40 downward to the floor panel (front floor panel 4), and the weight of the console support bracket 40 can be reduced and its supporting rigidity can be improved.

Further, in an embodiment of the present invention, side walls 40b and 40c of the gate-shaped console support bracket 40, which includes an upper wall 40a and left and right side walls 40b and 40c, are fixed to the upper enlarged cross section 41. (See Figure 10).

According to this configuration, the heights of both side walls 40b and 40c of the console support bracket 40 are reduced by the vertical height of the floor cross member (front cross member 18) and the vertical height of the upper enlarged cross-section portion 41. Therefore, the weight of the console support bracket 40 can be reduced.

Further, in an embodiment of the present invention, the floor cross member (front cross member 18) has an upper surface formed substantially in a straight line in the vehicle width direction, and the upper enlarged cross section 41 is formed in the floor cross member 18. It is formed of a cross member reinforcing member 42 that is separate from the member (front cross member 18) (see FIGS. 9 and 10).
According to this configuration, since the upper enlarged cross-sectional portion 41 is formed separately from the floor cross member (front cross member 18), the ridge lines X1 and X2 of the basic part of the floor cross member (front cross member 18) (see FIG. 14) can be made into a straight line, and the side collision performance can be improved.

Furthermore, in one embodiment of the present invention, left and right floor frames (see floor frame lower 16) extending in the longitudinal direction of the vehicle are provided at the bottom of the floor panel (front floor panel 4), and the left and right floor frames (see floor frame lower 16) are provided at the bottom of the floor panel (front floor panel 4). The floor cross member portion (see intermediate member 20) between the floor frames (floor frame lower 16) has higher rigidity than the portion (see side member 21) located outward in the vehicle width direction from the floor frame (floor frame lower 16), Moreover, it is formed from one piece (see FIG. 9).

In the above embodiment, the portion located outside the floor frame lower 16 in the vehicle width direction is formed of a high-tensile steel plate (so-called high-tensile steel) with a plate thickness of 1.0 mm, and the floor cross section between the left and right floor frame lowers 16 is Although the member portion was formed of an ultra-high tensile steel plate with a thickness of 1.8 mm, the plate thickness and material are not limited thereto.
According to this configuration, side collision energy is absorbed at the outer portion (side member 21) of the floor cross member (front cross member 18) located on the outer side in the vehicle width direction than the floor frame (floor frame lower 16). At the same time, side collision performance can be improved by forming the floor cross member portion (intermediate member 20), that is, the basic portion, between the left and right floor frames (floor frame lower 16) from one piece.

In addition, in an embodiment of the present invention, fixing portions at the front of the front seat (see seat fixing portions 44) are provided on both sides of the upper enlarged cross-sectional portion 41 in the vehicle width direction at the same height as the upper enlarged cross-sectional portion 41. is formed (see FIG. 9).
According to this configuration, the ridgelines X3 and X4 (see FIG. 14) of the upper enlarged cross-section portion 41 can be made straight in the vehicle width direction, and side collision performance can be improved, and the cross member reinforcing member It is also possible to improve the moldability of 42.

Further, in an embodiment of the present invention, a shift lever support bracket 73 is attached to the console support bracket 40 above the floor cross member (front cross member 18), and a shift lever support bracket 73 is attached to the upper surface of the cross member reinforcing member 42. A reinforcing support bracket 51 is erected and fixed to support the upper surface of the console support bracket 40 from below (see FIGS. 9 and 10).
According to this configuration, by providing the above-mentioned reinforcing support bracket 51, it is possible to improve the vertical rigidity of the upper enlarged cross-section portion 41.

Furthermore, in one embodiment of the present invention, the shift lever support brackets 73 are attached to the console support brackets 40 on the left and right, and the reinforcement support brackets 51 are formed in an M-shaped cross section when viewed from the front of the vehicle. (See FIGS. 9 and 10).
According to this configuration, by forming the reinforcing support bracket 51 into an M-shaped cross section, the rigidity of the reinforcing support bracket 51 itself is improved, and as a result, the space between the left and right support parts of the shift lever support bracket 73 is improved. It can improve rigidity.

Additionally, in one embodiment of the present invention, the reinforcement support bracket 51 is attached to the cross member reinforcement member 42 together with the console support bracket 40 (see FIG. 10).
According to this configuration, the cross member reinforcing member 42, the reinforcing support bracket 51, and the console support bracket 40 are so-called co-tightened and fixed, so the spacing between the supporting parts of the reinforcing support bracket 51 can be increased, and the support (See the jointly tightened portion by the fastening member 43).

In the correspondence between the structure of this invention and the above-mentioned embodiments,
The floor panel of this invention corresponds to the front floor panel 4 of the embodiment,
Similarly below,
The floor cross member corresponds to the front cross member 18 (so-called No. 2 cross member),
The floor frame corresponds to the floor frame lower 16,
The fixing part at the front of the front seat corresponds to the seat fixing part 44,
The present invention is not limited to the configuration of the above-described embodiment.

As described above, the present invention is useful for the lower body structure of an electric vehicle that includes a console support bracket that supports a console.

4...Front floor panel (floor panel)
10...Side sill 16...Floor frame lower (floor frame)
18...Front cross member (floor cross member)
40...Console support bracket 40a...Top wall 40b, 40c...Side wall 41...Upper enlarged cross section 42...Cross member reinforcing member 44...Seat fixing part (fixing part at the front of the front seat)
51... Reinforcement support bracket 70... Console 73... Shift lever support bracket

Claims (5)

A lower body structure of an electric vehicle,
A floor panel that forms the floor surface of the vehicle interior;
a floor cross member arranged at the lower part of the front of the front seat so that the upper part of the floor panel is aligned with the height of the side sills, and extends in a straight line in the vehicle width direction between the pair of left and right side sills;
a console support bracket disposed above the center of the floor cross member to support the console;
The floor cross member is provided with an upwardly expanding cross-sectional section that expands upward to the height of the console support bracket at the upper center of the floor cross member ;
A side wall of the gate-shaped console support bracket having an upper wall and left and right side walls is fixed to the upper enlarged cross section,
The floor cross member has an upper surface formed in a substantially straight line in the vehicle width direction,
The upper enlarged cross section is formed by a cross member reinforcing member separate from the floor cross member,
At the bottom of the floor panel, there are left and right floor frames that extend in the longitudinal direction of the vehicle.
The floor cross member portion between the left and right floor frames is more rigid than the portion located outside the floor frame in the vehicle width direction, and is formed from a single piece.
Lower body structure of electric vehicle. 2. The lower vehicle body structure for an electric vehicle according to claim 1 , wherein fixing portions of the front seat front portion are formed on both sides of the upper enlarged cross section in the vehicle width direction at the same height as the upper enlarged cross section. A lower body structure of an electric vehicle,
A floor panel that forms the floor surface of the vehicle interior;
a floor cross member arranged at the lower part of the front of the front seat so that the upper part of the floor panel is aligned with the height of the side sills, and extends in a straight line in the vehicle width direction between the pair of left and right side sills;
a console support bracket disposed above the center of the floor cross member to support the console;
The floor cross member is provided with an upwardly expanding cross-sectional section that expands upward to the height of the console support bracket at the upper center of the floor cross member;
A side wall of the gate-shaped console support bracket having an upper wall and left and right side walls is fixed to the upper enlarged cross section,
The floor cross member has an upper surface formed in a substantially straight line in the vehicle width direction,
The upper enlarged cross section is formed by a cross member reinforcing member separate from the floor cross member,
A shift lever support bracket is attached to the console support bracket above the floor cross member,
A reinforcing support bracket that supports the upper surface of the console support bracket from below is erected and fixed on the upper surface of the cross member reinforcing member.
Lower body structure of electric vehicle. The shift lever support brackets are attached to the console support brackets on the left and right sides,
4. The lower body structure of an electric vehicle according to claim 3 , wherein the reinforcing support bracket has an M-shaped cross section when viewed from the front of the vehicle. 5. The lower vehicle body structure for an electric vehicle according to claim 3 , wherein the reinforcing support bracket is attached to the cross member reinforcing member together with the console support bracket.

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