JP2024030193A - cross member - Google Patents

Abstract

To suppress an increase in a weight using a tabular cross member, and reduce a fear that the cross member comes into contact with a driving battery even in a case where the cross member is deformed due to a side impact on an own vehicle.SOLUTION: A cross member includes a main body 21 that is formed like a plate extending in a vehicle width direction and vehicle height direction and has both ends fastened to a pair of side rails 2 and 3, a first support part 22 that is located on one side of a space between the side rails 2 and 3 and fastened to the main body 21 and side rail 2, and a second support part 23 that is located on the other sides of the space between the side rails 2 and 3 and fastened to the main body 21 and side rail 3. The first support part 22 and second support part 23 are interposed between a driving battery 5 and the main body 21 in a vehicular fore-and-aft direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cross member provided between a pair of left and right side rails of a vehicle.

In recent years, from the perspective of reducing environmental impact, in the field of commercial vehicles such as trucks, there has been development of electric vehicles that are driven only by electric motors without internal combustion engines, and hybrid electric vehicles that are equipped with electric motors to suppress exhaust gases. is being carried out. Such electric vehicles need to be equipped with a driving battery for supplying electricity to the electric motor.

For example, Patent Document 1 discloses that in an electric vehicle such as a truck that has a frame structure (so-called ladder frame) in which a pair of left and right side rails are connected by a cross member, a driving battery is arranged between the side rails, A configuration in which the device is supported by a side rail is disclosed.

Japanese Patent Application Publication No. 2016-113063

By the way, in a vehicle where a driving battery, which is a heavy component, is installed between the side rails, depending on the size and weight of the driving battery, for example, vertical movement of the driving battery caused by the vehicle running may cause the frame to move in the vehicle height direction. Large stresses may be applied.
In this case, excessive stress may be applied to the cross member due to the displacement of the frame.

To deal with this, it is effective to add a cross member near the drive battery to increase the rigidity of the frame. However, we want to limit the increase in vehicle weight. From this viewpoint, it is conceivable to increase the rigidity in the vehicle height direction while suppressing an increase in the weight of the vehicle by using a plate-shaped cross member extending in the vehicle width direction and vehicle height direction.

However, when such a plate-shaped cross member is used, if another vehicle rear-ends the side of the own vehicle, there is a risk that the cross member may bend in the longitudinal direction of the vehicle.
At this time, since the drive battery is disposed near the cross member, it is possible that the bent cross member may come into contact with the drive battery and damage the drive battery.
On the other hand, if an attempt is made to increase the rigidity of the cross member in the vehicle length direction by simply increasing the plate thickness, the weight of the cross member will increase.

This project was developed with a focus on these issues, and uses a plate-shaped cross member that extends in the vehicle width direction and vehicle height direction to suppress weight increase, while temporarily reducing the side impact to the own vehicle. It is an object of the present invention to provide a cross member that can reduce the risk of contact between the cross member and a drive battery even if the cross member is deformed due to a collision.

The present invention has been made to solve at least part of the above problems, and can be realized in the following aspects or application examples.
The cross member according to this application example is a cross member of a vehicle that is provided between a pair of side rails and close to a drive battery, and is formed in a plate shape extending in the vehicle width direction and vehicle height direction, and has both ends connected to the pair of side rails. a main body portion fastened to each of the side rails, a first support portion located on one side between the pair of side rails and fastened to the main body portion and the side rails, and a first support portion between the pair of side rails. The second support part is located on the other side and is fastened to the main body part and the side rail, and the first support part and the second support part are connected to the drive battery and the It is characterized by being disposed at a position between the main body part.

According to this application example, the main body of the cross member is formed into a plate shape extending in the vehicle width direction and the vehicle height direction, and both ends are connected to each of the pair of side rails, thereby suppressing an increase in the weight of the vehicle. At the same time, the rigidity of the area near the driving battery between the pair of side rails can be increased.
Moreover, the first support part and the second support part are fastened to the main body part and the side rail on one side and the other side (both ends of the main body part) between the pair of side rails, but the first support part and the second support part The second support part is located between the driving battery and the main body in the longitudinal direction of the vehicle, that is, the first support part and the second support part are arranged on the side of the main body that is closer to (the center of) the driving battery. be done.
Therefore, when a deformation input is applied to the cross member due to a side collision with the host vehicle, at both ends of the main body, the side closer to the drive battery is supported by the first support part and the second support part, and the side closer to the drive battery is supported by the first support part and the second support part. Deformation toward the side away from the drive battery is suppressed, and deformation occurs toward the side away from the drive battery. This reduces the risk of contact between the cross member and the drive battery.

According to this case, the cross member provided between the side rails can increase the rigidity of the frame while suppressing an increase in vehicle weight, and even if the cross member is deformed due to a side collision with the own vehicle. , it is possible to reduce the risk of contact between the cross member and the driving battery.

FIG. 2 is a perspective view of main parts of a frame structure according to an embodiment. FIG. 2 is a plan view of main parts of a frame structure according to an embodiment. FIG. 3 is an enlarged view of the main part of FIG. 2; FIG. 2 is a schematic cross-sectional view illustrating the effect of suppressing displacement and deformation of a cross member of a frame structure according to an embodiment, in which (a) shows the present embodiment and (b) shows a comparative example. FIG. 3 is a perspective view showing a mounting member of a frame structure according to an embodiment, in which (a) shows one side thereof (the surface facing outward in the vehicle width direction when installed), and FIG. Indicates the side facing the FIG. 2 is an exploded perspective view of main parts of the frame structure according to the embodiment. FIG. 2 is a perspective view of a cross member according to an embodiment. It is a top view of the cross member concerning an embodiment. It is a front view of the cross member concerning an embodiment. FIG. 2 is a perspective view of the main body of the cross member according to the embodiment. It is a perspective view of the 1st support part and the 2nd support part of the cross member based on embodiment, (a) shows the 1st support part, and (b) shows the 2nd support part. FIG. 3 is an exploded perspective view of the cross member according to the embodiment. FIG. 2 is a cross-sectional view (a cross-sectional view taken along the vehicle width direction) of the frame structure showing the positional relationship between the cross member and the driving battery according to the embodiment. FIG. 2 is a longitudinal cross-sectional view (a cross-sectional view taken along the vehicle length direction) of the frame structure showing the positional relationship between the cross member and the driving battery according to the embodiment. FIG. 4 is a plan view of a main part of a frame structure for explaining the action of a cross member according to an embodiment, in which (a) shows a case where the cross member is not deformed, and (b) shows a case in which the cross member is deformed due to a side collision with the host vehicle. This shows the case where is deformed.

An embodiment of the present invention will be described with reference to the drawings. This embodiment is merely an example, and there is no intention to exclude the application of various modifications and techniques not specified in the following embodiments. Each structure of this embodiment can be modified and implemented in various ways without departing from the spirit thereof. Further, they can be selected or combined as necessary.

[1. Device configuration]
The frame structure according to the present embodiment is applied to a chassis frame called a so-called ladder frame, which is installed in a vehicle such as a truck.
Further, this vehicle is an electric vehicle that includes an electric motor (not shown) as a driving power source (hereinafter also referred to as a driving motor). This electric vehicle includes not only an electric vehicle equipped only with an electric motor as a driving power source, but also a so-called hybrid electric vehicle equipped with an engine and an electric motor as a driving power source.

As shown in FIG. 2, the chassis frame 1 of the vehicle includes a pair of left and right side rails 2, 3 extending along the front-rear direction of the vehicle, and a pair of side rails 2, 3 disposed between these side rails 2, 3 along the vehicle width direction. The frame includes a plurality of cross members 4A, 4B, and 4C (indicated by the numeral "4" if not individually distinguished), and is configured as a so-called ladder frame. In addition, in FIG. 2, the front wheels 6a, the rear wheels 6b, and the drive battery 5 are shown with two-dot chain lines to make them easier to distinguish from the frame structure.

The side rails 2 and 3 have a U-shaped cross section, and include a web portion, an upper flange portion bent toward the inside of the vehicle on the web portion, and a top flange portion bent toward the inside of the vehicle below the web portion. and a lower flange portion.
In FIG. 2, the vehicle front side portion and the vehicle rear side portion of the side rails 2 and 3 are omitted, and the second cross member (second cross member) 4A and the third cross member (third cross member) from the front of the vehicle are omitted. Although only the cross member) 4B and the fourth cross member (third cross member) 4C are shown, the chassis frame 1 is further provided with a cross member 4 (not shown).

Although details are not shown, these cross members 4 are of a so-called alligator type. That is, the cross member 4 is constructed by joining an upper cross member member and a lower cross member member, each of which has a hat-shaped cross section, and is attached to the web portions of the side rails 2 and 3. Thereby, when the load input to the side rails 2 and 3 is transmitted to the cross member 4, the cross member 4 can absorb the load while deforming, and a so-called flexible frame structure is formed. However, these cross members 4 are not limited to the alligator type.

The driving battery 5 (hereinafter also simply referred to as "battery 5") that supplies power to the traveling motor is arranged between the second cross member 4A and the third cross member 4B in the vehicle length direction. In the vehicle width direction, it is arranged from the outside of the left side rail 2 to the outside of the right side rail 3.
Further, as shown in FIG. 4(a), the battery 5 is arranged below the side rails 2 and 3 in the vehicle height direction. Note that FIG. 4(a) partially shows the vicinity of one side rail 2 (here, the left side) as seen from the rear toward the front, but the vicinity of the other side rail 3 is partially shown. It is symmetrical and similarly constructed.

Here, the frame structure of the portion that supports the battery 5 will be explained.
As described above, the battery 5 is arranged below the side rails 2 and 3, but as shown in FIG. 4(a), the battery 5 is located at both edges in the vehicle width direction. Each is attached via a support member (battery adapter) 10.

The support member 10 is formed by bending a sheet metal plate, as shown in FIGS. 5(a), (b), and 6. ) is formed into a hat shape. That is, in the center of the hat shape, on the concave side (see FIG. 5(b)), the first mounting surface portion 11 is attached with the rubber mount 32 modeled in FIGS. 4(a) and 4(b). Flange-shaped second mounting surface portions 12 and 13 are formed on both sides of the first mounting surface portion 11 to be bolted to the side rails 2 and 3.

In the first mounting surface portion 11, a plurality of (three in this example) bolt holes 11a arranged in a row in the vertical direction are formed on both sides centering on the center in the width direction. These bolt holes 11a are for bolting the rubber mount 32, and as shown in FIG. 4(a), the battery bracket 31 is bolted to the battery 5 via the rubber mount 32. A plurality of (four in this example) bolt holes 12a, 13a are formed in the second mounting surface portions 12, 13, respectively, arranged vertically in a row. It is fastened together with a cross member 20, which will be described later, through two upper and lower bolt holes 12a).

As shown in FIGS. 5(a) and 5(b), the support member 10 includes a rear body support portion 14 that supports the rear body bracket 36 above the first mounting surface portion 11. This rear body support part 14 is arranged horizontally with the support member 10 attached to the side rails 2 and 3, and has a stud bolt 15 protruding from the center of the upper surface.

As shown in FIG. 4(a), in the rear body 40, a vertical joist 35 extending in the vehicle length direction and having a closed cross-sectional structure is attached to the upper flange portions of the side rails 2 and 3 via a buffer material 37. . Further, rear body brackets 36 for connecting the rear body 40 and the chassis frame 1 are appropriately arranged along the vehicle length direction.

The rear body bracket 36 has a vertical surface portion 36a fixed to the outer surface of the vertical joist 35, and is fastened to a stud bolt of the support member 10 through a bolt hole in an outward horizontal surface portion 36b below the vertical surface portion 36a. .

As shown in FIG. 4(a), this frame structure includes, in addition to the support member 10, a cross member 20 provided between the side rails 2 and 3 at a position in the vehicle length direction where the support member 10 is attached. .
This cross member 20 is different from the above-described cross member 4, and is formed in a plate shape extending in the vehicle width direction and vehicle height direction, and is fastened to the side rails 2 and 3 together with the support member 10. be equipped.

Here, the cross member 20 will be explained.
As shown in FIGS. 1 and 2, the cross member 20 includes a main body 21 that spans between the side rails 2 and 3 and has both ends fastened to each of the side rails 2 and 3, and , 3 and fastened to the main body part 21 and the side rail 2 (hereinafter also simply referred to as "support part 22"), and the other part between the side rails 2 and 3. It is composed of three members: a second support part 23 (hereinafter also simply referred to as "support part 23") which is located on the side and is fastened to the main body part 21 and the side rail 3.

These members 21 to 23 are all formed using steel materials.
As shown in FIGS. 1 and 6 to 10, the main body portion 21 extends in the vehicle width direction so as to connect the web portions of the side rails 2 and 3 to each other, and has a length close to the vertical length of the web portions. The main portion 21A extends in the vehicle height direction. However, in order to reduce the weight, a plurality of large and small lightening holes 21a and 21b are formed in the main portion 21A. In addition, the main portion 21A is shifted upward in the intermediate portion in the vehicle width direction, and the lower portion is largely cut out to reduce the length of the entire intermediate portion in the vehicle height direction. ing. Thereby, the lower edge 21d of the intermediate portion of the main portion 21A has a large clearance with the battery 5 located below.

A large lightening hole 21a is formed at both ends in the longitudinal direction (both ends in the vehicle width direction at the time of installation) of the main portion 21A of the main body portion 21, and only both ends in the vehicle height direction are left as flesh portions. A plurality (in this case, two) of bolt holes 21c are vertically arranged and formed in the longitudinal direction inside the lightening hole 21a of the main body part 21 to be bolted to the first support part 22 and the second support part 23. ing. A plurality (three in this case) of lightening holes 21b each having an inner diameter larger than the bolt hole 21c and smaller than the lightening hole 21a are provided at a longitudinally intermediate portion inside each bolt hole 21c in the longitudinal direction.

As shown in FIGS. 1, 6 to 9, and 11(a) and 11(b), the support parts 22 and 23 are formed in a shape corresponding to both ends of the main body 21 in the longitudinal direction. Similar to the portion 21, the main portions 22A, 23A are provided with large lightening holes 22a, 23a, and only both ends in the vehicle height direction are left as fleshy portions. A plurality (in this case, two) of bolt holes 22c and 23c for bolting to the main body part 21 are vertically arranged on the inside of the lightening holes 21a of the main parts 22A and 23A of the support parts 22 and 23 in the longitudinal direction. has been done.

Attachment surface portions 24 that are fastened to the web portions of the side rails 2 and 3 are formed at both longitudinal ends of the main body portion 21 . Similarly, attachment surface portions 25 and 26 fastened to the web portions of the side rails 2 and 3 are formed at one ends of the main portions 22A and 23A of the support portions 22 and 23, respectively. A plurality of (three in this example) bolt holes 24a, 25a, 26a are formed in each of the mounting surface portions 24, 25, 26 in a row in the vertical direction.

Since such a cross member 20 is divided into three members 21 to 23, it can be retrofitted to the already assembled chassis frame 1.
In other words, as shown in FIG. 3, since the mounting surface parts 24 at both ends of the main body part 21 are formed only on one side (the front side in the vehicle length direction at the time of installation), the main body part 21 can be slanted in plan view so that the side rails can be mounted easily. 2 and 3 and rotate it so that it faces in the vehicle width direction. Then, as shown in FIG. The cross member 20 to which 23 is coupled can be placed between the side rails 2 and 3.

Although FIG. 6 shows the side rail 3, the side rail 2 is also configured in a similar manner. As shown in FIG. 6, the second mounting surface portion 12 of the support member 10 is brought into contact with the outside of the web portions of the side rails 2 and 3, and the mounting surface portion of the cross member 20 is placed inside the web portion of the side rail 3. 24 are brought into contact with each other through a plurality (three in this case) of bolt holes 3a formed in the side rails 2, 3, bolt holes 12a of the second mounting surface section 12, and bolt holes 24a of the mounting surface section 24, The support member 10 and the cross member 20 are fastened together. Although FIG. 6 shows only the bolt holes 3a near where the cross member 20 is fastened to the side rail 3, the side rail 3 has such bolt holes 3a in the longitudinal direction (vehicle length direction). They are formed in large numbers lined up at equal intervals.

In FIG. 6, the first and third bolt holes 12a from the top of the second mounting surface 12 of the support member 10 and the first and third bolt holes 24a from the top of the mounting surface 24 of the cross member 20 are used. The dashed line indicates that they are tightened together.

Here, a structure of the present cross member that can reduce the risk of contact between the cross member and the driving battery even if the cross member is deformed due to a side collision with the host vehicle will be described.

1, 13, and 14 are diagrams showing the positional relationship between the cross member 20 attached to the frame structure and the battery 5 according to the present embodiment. As shown in FIGS. 1, 13, and 14, the battery 5 is provided with a protrusion 5a that is raised upwardly at the center of its upper surface.

The cross member 20 is disposed directly above the vehicle front edge (front edge) of the protrusion 5a of the battery 5. Therefore, when the cross member 20 is deformed due to a side collision with the host vehicle and the cross member 20 approaches the battery 5, the main portion (longitudinal central portion) 21A of the main body portion 21 of the cross member 20 There is a high possibility that it will come into contact with the portion 5a.

A major deformation of the cross member 20 caused by a side collision is considered to be buckling deformation of the main body portion 21 of the cross member 20. This buckling deformation is a deformation in which the center of the main portion 21A of the main body portion 21 is displaced toward the front side of the vehicle or the rear side of the vehicle.In addition to this buckling deformation, the center of the main portion 21A of the main body portion 21 is displaced vertically downward. When the cross member 20 and the battery 5 are relatively displaced so as to approach each other in the vertical direction, the center of the main portion 21A comes into contact with the protruding portion 5a of the battery 5.

However, in the case of this embodiment, the cross member 20 is arranged directly above the front edge of the protrusion 5a of the battery 5. Therefore, if the center of the main portion 21A of the main body portion 21 is buckled and deformed to move away from the protrusion 5a (in this case, toward the front of the vehicle), the center of the main portion 21A will be separated from the protrusion 5a. , the possibility that the center of the main portion 21A will come into contact with the protruding portion 5a of the battery 5 is reduced.

Considering this point, in this embodiment, the first support part 22 and the second support part 23 are located at a position between the battery 5 (its protruding part 5a) and the main body part 21 in the longitudinal direction of the vehicle, that is, the main body part 21. It is disposed at a position closer to the center of the protruding portion 5a than the portion 21 is.

When each of the support parts 22 and 23 is fastened to both ends of the main body part 21, both ends of the main body part 21 are deformed toward the side supported by the support parts 22 and 23 (i.e., toward the protruding part 5a side of the battery 5). As a result, both ends of the main body portion 21 deform to the side not supported by the support portions 22 and 23 (the side opposite to the protruding portion 5a of the battery 5). As a result, the cross member 20 changes from the state shown in FIG. 15(a) to the side where the center of the main part 21A of the main body part 21 is away from the protruding part 5a (here, the front side of the vehicle), as shown in FIG. 15(b). side).

[2. Action and effect]
With the above configuration and the frame structure according to the present embodiment, the load of the battery 5 is applied to the side rails 2 and 3 through the support member 10, so if the cross member 20 is not provided, As shown, the side rails 2 and 3 are deformed, and the portion supporting the support member 10 is displaced. This may create excessive stress on certain support points, such as stud bolts, for example.

On the other hand, as shown in FIG. 4(a), by providing a cross member 20 formed in a plate shape extending in the vehicle width direction and vehicle height direction, the cross member 20 can be attached to the chassis frame 1. In order to increase the rigidity (particularly the rigidity in the torsional direction), deformation of the side rails 2 and 3 is suppressed, and displacement of the portion supporting the support member 10 is suppressed. Therefore, it is possible to suppress the stress applied to the support portion of the battery, etc., and avoid applying excessive stress to a specific location.

Further, since the cross member 20 is formed in a plate shape extending in the vehicle width direction and the vehicle height direction, the rigidity of the side rails 2 and 3 can be increased while suppressing an increase in the weight of the cross member 20 itself.

In particular, in this embodiment, the cross member 20 has the lightening holes 21a, 21b and a structure in which the lower part is cut out and the length in the vehicle height direction is narrowed, so that weight reduction is achieved. In the part where the lightening hole 21a is formed, both ends in the vehicle height direction are left as fleshy parts, and the main body part 21, the first support part 22, and the second support part 23 overlap. Therefore, the rigidity of the chassis frame 1 is efficiently improved.

Further, by tightening the cross member 20 and the support member 10 together, stress at the side rail attachment portion of the cross member 20 can be reduced.

On the other hand, the cross member 20 is formed into a plate shape extending in the vehicle width direction and the vehicle height direction, and is designed to reduce the size (plate thickness) in the vehicle length direction to reduce weight. When a compressive load is applied to the cross member 20 from both ends due to a side collision, the cross member 20 may undergo buckling deformation such that the center of the main portion 21A of the main body portion 21 is displaced toward the front side of the vehicle or the rear side of the vehicle. . In addition to this buckling deformation, if the center of the main part 21A of the main body part 21 deforms vertically downward, or if the cross member 20 and the battery 5 move relative to each other in the vertical direction, the main part There is a possibility that the center of 21A may come into contact with the protruding portion 5a of the battery 5 and damage the battery 5.

In the cross member 20 according to the present embodiment, the lower edge 21d of the intermediate portion of the main portion 21A of the main body portion 21 is disposed upward, and a large clearance with the battery 5 located below the lower edge 21d is provided. Therefore, even if the cross member 20 is deformed, the risk that the main portion 21A of the cross member 20 will come into contact with the protruding portion 5a of the battery 5 is reduced, and the risk of damaging the battery 5 is reduced.

Furthermore, as a more characteristic configuration of the cross member 20 according to the present embodiment, the first support section 22 and the second support section 23 are arranged between the battery 5 (its protruding section 5a) and the main body section 21 in the longitudinal direction of the vehicle. , that is, at a position closer to the center of the protruding portion 5a than the main body portion 21 is.

With this arrangement, when a load in the left and right direction is applied to the cross member 20 due to a side collision, as shown by the white arrow in FIG. 15(b), both ends of the main body 21 are As shown, the cross member 20 is deformed to the side not supported by the support parts 22 and 23 (the side opposite to the protrusion 5a of the battery 5), and the center of the main part 21A of the main body part 21 is aligned with the protrusion 5a. (in this case, to the front side of the vehicle). Therefore, the risk that the main portion 21A of the cross member 20 will come into contact with the protruding portion 5a of the battery 5 is reduced, and the risk of damaging the battery 5 is reduced.

[3. others]
The configuration of the embodiment described above is an example, and can be modified and implemented as appropriate without departing from the spirit of the present invention.
For example, in the above embodiment, the cross member 20 is arranged directly above the vicinity of the front edge of the protrusion 5a of the battery 5, but the cross member 20 is disposed near the rear edge of the protrusion 5a of the battery 5. It may be placed directly above the . In this case as well, the first support part 22 and the second support part 23 are positioned between the battery 5 (its protrusion 5a) and the main body part 21 in the longitudinal direction of the vehicle, that is, the protrusion part 5a is located closer to the protrusion part 5a than the main body part 21. It may be placed at a position closer to the center. Specifically, the first support part 22 and the second support part 23 may be arranged and fastened on the vehicle front side of the main body part 21.

Further, the lightening holes 21a, 21b, etc. for reducing the weight of the cross member 20 may be formed as appropriate.
Furthermore, although the support member 10 has a function of supporting the rear body, this is not essential either.
Further, the cross member of the present invention may be installed between the side rails regardless of the support member 10.

1 Chassis frame 2, 3 Side rail 3a Bolt hole 4, 4A, 4B Cross member 5 Battery 5a Projection part 6a Front wheel 6b Rear wheel 10 Support member (battery adapter)
11 First mounting surface portion 12, 13 Second mounting surface portion 11a, 12a, 13a Bolt hole 14 Rear body support portion 15 Stud bolt 20 Cross member 21 Main body portion 21A Main portion of main body portion 21 21a, 21b Lightening hole 21c Bolt hole 21d Main Lower edge of intermediate part of part 21A 22 First support part 22A Main part of first support part 22 22a Lightening hole 22c Bolt hole 23 Second support part 23A Main part of second support part 22 22a, 23a Lightening hole 22c , 23c Bolt hole 24, 25, 26 Mounting surface 24a, 25a, 26a Bolt hole 31 Battery bracket 32 Rubber mount 35 Horizontal joist 36 Rear body bracket 37 Cushioning material 40 Rear body

Claims (1)

In a cross member of a vehicle that is provided close to a drive battery between a pair of side rails,
a main body portion formed in a plate shape extending in the vehicle width direction and vehicle height direction and having both ends fastened to each of the pair of side rails;
a first support part located on one side between the pair of side rails and fastened to each of the main body part and the side rail;
a second support part located on the other side between the pair of side rails and fastened to each of the main body part and the side rail,
The cross member is characterized in that the first support part and the second support part are disposed at positions between the drive battery and the main body part in the longitudinal direction of the vehicle.

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