CN209776545U

CN209776545U - Vehicle lower structure

Info

Publication number: CN209776545U
Application number: CN201920284362.6U
Authority: CN
Inventors: 乙黑一真
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2019-12-13
Anticipated expiration: 2029-03-06

Abstract

The utility model provides a vehicle substructure. The vehicle lower structure includes a floor panel, lower frames joined to both sides of a lower surface of the floor panel in a vehicle width direction and extending in a vehicle length direction, and a battery pack disposed between the two lower frames on the lower side of the floor panel, each of the lower frames including a first frame portion extending in the vehicle length direction, a second frame portion extending from a rear end of the first frame portion toward a vehicle body rear side and inclined outward in the vehicle width direction, and a third frame portion extending from a rear end of the second frame portion toward the vehicle body rear side. In the vehicle lower structure according to the present invention, the space between the two lower frames is increased in size in the vehicle width direction at the rear of the second frame portion, and therefore, a large battery pack can be disposed.

Description

vehicle lower structure

Technical Field

The utility model relates to a vehicle substructure.

Background

Conventionally, as a method of mounting a battery pack on an electric vehicle, a method of supporting the battery pack on a lower side of a floor panel is known. In the vehicle adopting this type, a lower frame extending in the vehicle length direction is generally joined to a lower surface of a floor panel as a vehicle lower member. Fig. 7 is a schematic bottom view showing a vehicle lower structure of a general electric vehicle in the related art. As shown in fig. 7, the lower frames a on both sides are arranged at positions separated by a predetermined dimension from both ends in the vehicle width direction of the floor panel c (i.e., on the inner side in the vehicle width direction) so as to bypass the front wheels b on both sides (as indicated by the virtual line), and extend linearly in the vehicle length direction. The battery pack d is disposed in a space between the two lower frames a and supported by the floor panel c.

In order to extend the cruising distance of an electric vehicle, it is generally necessary to use a large-sized battery pack d. However, in the above-described structure of the related art, the size of the battery pack d in the vehicle width direction is limited. Therefore, in order to further increase the size of the battery pack d, a vehicle lower portion structure that can allow the size of the battery pack d to increase in the vehicle width direction is required.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, it is an object of the present invention to provide a vehicle lower structure that can allow the size of a battery pack to be increased in the vehicle width direction.

As a technical solution to solve the above technical problem, the utility model provides a vehicle substructure, this vehicle substructure includes the vehicle bottom plate, the joint is in the both sides of the car width direction of the lower surface of vehicle bottom plate and the downside frame that extends along the car length direction, and the configuration are in two of vehicle bottom plate downside battery between the downside frame, its characterized in that: each of the lower frames includes a first frame portion extending in the vehicle length direction, a second frame portion extending rearward of the vehicle body from a rear end of the first frame portion and inclined outward in the vehicle width direction, and a third frame portion extending rearward of the vehicle body from a rear end of the second frame portion.

The present invention has an advantage in that the size of the battery pack in the vehicle width direction can be increased. Specifically, each of the lower frames includes a second frame portion extending rearward of the vehicle body from a rear end of the first frame portion and inclined outward in the vehicle width direction, and a space between the two lower frames increases in the vehicle width direction rearward of the second frame portion, so that it is possible to allow the battery pack disposed in the space to increase in the vehicle width direction, that is, it is possible to dispose a large-sized battery pack on the lower side of the floor panel of the vehicle using the space.

In the vehicle lower structure according to the present invention, it is preferable that the battery pack is disposed on an upper side of a battery support plate having a plurality of cross plates extending in a vehicle width direction, both ends of each of the cross plates in the vehicle width direction are fastened to the lower frames on the corresponding sides, and a distance between positions where the lower frames are fastened to the cross plates is set so that the distance between the second frame portion and the third frame portion is larger than the distance between the second frame portion and the third frame portion. With this structure, the battery pack can be mounted on the lower frame with the battery support plate.

In the vehicle lower section structure according to the present invention, it is preferable that the first frame portion and the third frame portion are each formed by joining together a plurality of frame members, and the second frame portion is formed by a single frame member, in the longitudinal direction of the lower frame.

With this structure, the second frame portion can be ensured to have sufficient strength. Specifically, since the second frame portion is formed of a single frame member, there is no joint, and thus the strength is high. When a vehicle collides frontally, the second frame portion may receive a collision load in a direction of bending the second frame portion, but since the second frame portion has sufficient strength, bending deformation is less likely to occur.

In the vehicle lower section structure of the present invention, it is preferable that the second frame portion is formed of a member having a hat-shaped cross section, and a closed inner space is formed between the second frame portion and the vehicle bottom plate, and a reinforcing member connected to each surface of the inner space is disposed in the inner space. With this configuration, since the reinforcement member is disposed inside the second frame portion, the strength of the second frame portion can be further improved.

Drawings

Fig. 1 is a plan view showing a vehicle lower section structure according to an embodiment of the present invention.

Fig. 2 is a bottom view showing the vehicle lower portion structure.

Fig. 3 is a perspective view for explaining an installation work of installing the battery pack on the floor.

Fig. 4 is a perspective view showing a part of the lower frame on the left side in the vehicle width direction.

Fig. 5 is a bottom view showing a vehicle lower part structure equipped with a battery pack.

Fig. 6 is a schematic bottom view of a vehicle lower portion structure showing the arrangement state of the battery pack.

Fig. 7 is a schematic bottom view showing a vehicle lower structure of a general electric vehicle in the related art.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a case where the vehicle lower structure of the present invention is applied to an electric vehicle will be described.

Fig. 1 is a plan view showing a vehicle lower portion structure according to the present embodiment. Fig. 2 is a bottom view showing the vehicle lower portion structure. In fig. 1 and 2, arrow FR indicates the vehicle body front side; arrow LH indicates the left side of the vehicle body; arrow RH indicates the right side of the vehicle body.

As shown in fig. 1 and 2, the vehicle lower portion structure of the present embodiment includes a floor panel 1 that constitutes a floor of a vehicle compartment. The vehicle bottom panel 1 is joined to the side members 2 at both ends in the vehicle width direction. Each side member 2 extends in the vehicle length direction.

The floor panel 1 is formed by integrally joining a dashboard lower panel 12, a front floor 11, a middle floor 13, and the like. Specifically, the front end edge of the front floor 11 is joined to the dash lower panel 12, and the rear end edge of the front floor 11 is joined to the middle floor 13.

An upper frame 3 extending in the vehicle length direction is joined to each of both sides (inward in the vehicle width direction from each side member 2) in the vehicle width direction of the upper surface of the floor panel 1. Each upper frame 3 is formed of a member having a hat-shaped cross section that opens downward, and is joined to the upper surface of the floor panel 1, whereby a closed cross-sectional structure is formed between the upper frame 3 and the floor panel 1. The upper frames 3 are joined to the floor panel 1 over the entire range from the dash panel 12 to the front floor 11.

Each upper frame 3 includes: a first frame portion 31 having a front end joined to the dash panel 4 and extending in the vehicle length direction; a second frame portion 32 extending rearward of the vehicle body from a rear end of the first frame portion 31 and inclined outward in the vehicle width direction; and a third frame portion 33 extending rearward of the vehicle body from a rear end of the second frame portion 32.

similarly, a lower frame 5 extending in the vehicle length direction is joined to each of both sides in the vehicle width direction of the lower surface of the floor panel 1 (the inner side in the vehicle width direction than each of the side members 2). Each lower frame 5 is formed of a member having a hat-shaped cross section which is open upward, and is joined to the lower surface of the floor panel 1, whereby a closed cross-sectional structure is formed between the lower frame 5 and the floor panel 1. The lower frames 5 are joined to the floor panel 1 over the entire range from the dash panel 12 to the front floor 11.

The shape of the lower frame 5 substantially conforms to the shape of the upper frame 3. That is, each lower frame 5 also includes: a first frame portion 51 extending in the vehicle length direction; a second frame member 52 extending rearward of the vehicle body from a rear end of the first frame member 51 and inclined outward in the vehicle width direction; and a third frame portion 53 extending rearward of the vehicle body from a rear end of the second frame portion 52. Each first frame portion 51 extends forward of the dash panel 4, and extends in the vehicle length direction on both sides in the vehicle width direction of a motor unit compartment (a housing space for housing a motor unit), not shown.

Fig. 4 is a perspective view showing a part of the lower frame 5 on the left side in the vehicle width direction. As shown in fig. 4, the first block 51 includes a front frame 51a constituting a front portion of the first block 51 in the vehicle longitudinal direction, and a rear frame 51b joined to a rear end portion of the front frame 51a and constituting a rear portion of the first block 51 in the vehicle longitudinal direction.

Similarly, the third frame portion 53 includes a front frame portion 53a constituting a front portion of the third frame portion 53 in the vehicle length direction, and a rear frame portion 53b joined to a rear end portion of the front frame portion 53a and constituting a rear portion of the third frame portion 53 in the vehicle length direction.

However, the second frame portion 52, the rear frame portion 51b of the first frame portion 51, and the front frame portion 53a of the third frame portion 53 are continuously formed of the same member, that is, are formed of a single member.

Therefore, in the longitudinal direction of the lower frame 5, the first frame portion 51 is configured by joining together a plurality of frame portions (51a, 51b), the third frame portion 53 is also configured by joining together a plurality of frame portions (53a, 53b), and the second frame portion 52 is configured by a single member. Therefore, no seam is formed in the second frame portion 52, and high rigidity can be obtained. When a vehicle collides frontally, the second frame portion 52 may receive a collision load in a direction of bending, but since the second frame portion 52 has high rigidity, bending deformation is less likely to occur.

As described above, the second frame portion 52 is formed of a member having a hat-shaped cross section, and forms a closed internal space with the floor panel 1, and the reinforcing members 54, 55, and 56 are provided at three locations in the internal space. These reinforcement members 54, 55, 56 are connected to respective faces of the inner space of the second frame portion 52.

Specifically, the second frame portion 52 includes a horizontal portion 52a extending in the horizontal direction at a lower end thereof; a pair of left and right vertical portions 52b, 52c extending upward from the outer and inner edges of the horizontal portion 52a in the vehicle width direction, respectively; and a pair of left and right flange portions 52d, 52e extending from upper ends of the two vertical portions 52b, 52c toward the outer side (outer side in the vehicle width direction) and the inner side (inner side in the vehicle width direction) in the horizontal direction, respectively.

And, the reinforcement members 54 located at the foremost side are engaged with the horizontal portion 52a, the vertical portions (52b and 52c), and the flange portions (52d and 52e), respectively, thereby reinforcing the second frame portion 52. The reinforcement members 55 at the intermediate positions are connected to the horizontal portion 52a and the vertical portions (52b and 52c), respectively, thereby reinforcing the second frame portion 52. The reinforcement members 56 on the rearmost side are engaged with the horizontal portion 52a and the vertical portions (52b and 52c), respectively, to thereby reinforce the second frame portion 52. In this manner, since the reinforcement members 54, 55, 56 are provided in the inner space of the second frame portion 52, the second frame portion 52 can obtain high rigidity.

Further, a plurality of cross members 61, 62, 63, 64 extending in the vehicle width direction are joined to the upper surface of the floor panel 1. These cross members 61, 62, 63, 64 are a first cross member 61, a second cross member 62, a third cross member 63, and a rear cross member 64 provided in this order from the vehicle front side.

The first cross member 61 extends in the vehicle width direction, and is over the rear end portions of the second frame portions 32 of the respective two upper side frames 3, and is joined to the upper surface of the front floor 11. Further, both ends of the first cross member 61 in the vehicle width direction are joined to the corresponding side members 2, respectively.

The second cross member 62 extends in the vehicle width direction, is laid over the vehicle length direction intermediate portion of the third frame portion 33 of each of the two upper side frames 3, and is joined to the upper surface of the front floor 11. The second cross member 62 is also joined at its respective ends in the vehicle width direction to the corresponding side members 2.

the third cross member 63 extends in the vehicle width direction rearward of the rear end portions of the third frame portions 33 of the respective two upper frames 3, and is joined to the upper surface of the middle floor 13. Further, both ends of the third cross member 63 in the vehicle width direction are also joined to the corresponding side members 2.

The rear cross member 64 includes a horizontal portion 65 joined to the upper surface of the center floor 13, and two vertical portions 66 extending upward from both ends of the horizontal portion 65 in the vehicle width direction and joined to a wheelhouse lining of each front wheel, not shown.

The first cross member 61, the second cross member 62, and the third cross member 63 are each formed of a member having a hat-shaped cross section that opens downward, and are joined to the upper surface of the floor panel 1 to form a closed cross-sectional structure with the floor panel 1. The horizontal portion 65 and the vertical portions 66 of the rear cross member 64 are each formed of a member having a hat-shaped cross section, and the horizontal portion 65 is joined to the upper surface of the center floor 13, and the vertical portions 66 are joined to the inner side surfaces of the corresponding wheel house liners, respectively, thereby forming a closed cross-sectional structure between the center floor 13 and the wheel house liners.

In addition, two floor reinforcement members 7 extending in the vehicle length direction are joined to the front side of the first cross member 61 on the upper surface of the floor panel 1. Each floor reinforcement member 7 is formed of a member having a hat-shaped cross section that opens downward, and by being joined to the upper surface of the floor 1, a closed cross-sectional structure is formed between the floor reinforcement member 7 and the floor 1. The region between the two floor reinforcement members 7 is a center tunnel portion 18 formed by bending a part of the front floor 11 upward.

The battery pack 8 (see fig. 3) is supported on the lower side of the floor panel 1. The battery pack 8 is constituted by a battery (a lithium ion battery as a secondary battery) housed in a case 81. The battery stores electric power for supplying an electric motor (not shown) for driving the electric vehicle to travel.

Fig. 3 is a perspective view for explaining an installation work of installing the battery pack 8 on the floor panel 1,

Fig. 5 is a bottom view showing a vehicle lower part structure to which the battery pack 8 is attached.

As shown in fig. 3 and 5, the battery pack 8 is disposed on a plate-shaped battery support plate 82, and the battery support plate 82 is attached (fastened) to the lower frames 5 on both sides, whereby the battery pack 8 is supported on the lower side of the floor panel 1.

Specifically, the battery support plate 82 includes a plurality of (9 in the present embodiment) lateral plates 83 extending in the vehicle width direction, and a plurality of (3 in the present embodiment) vertical plates 84 connecting the lateral plates 83 to each other and extending in the vehicle length direction. The battery support plates 82 are attached to the lower frames 5 on both sides by overlapping both ends of each cross plate 83 in the vehicle width direction with the lower surface of the corresponding lower frame 5 and fastening them with bolts. Of the 9 cross plates 83, 6 cross plates 83 located on the vehicle front side are disposed below the front floor 11, and 3 cross plates 83 located on the vehicle rear side are disposed below the middle floor 13.

In the present embodiment, the pitch between the positions at which the lower frame 5 and the respective lateral plates 83, … of the battery support plate 82 are fastened is set such that the pitch in the second frame portion 52 (see dimension P1 in fig. 5) is larger than the pitch in the third frame portion 53 (see dimension P2 in fig. 5).

Fig. 6 is a schematic bottom view of the vehicle lower portion structure showing the arrangement state of the battery pack 8. As described above, the lower frame 5 includes the second frame portion 52 extending rearward of the vehicle body from the rear end of the first frame portion 51 and inclined outward in the vehicle width direction, and the third frame portion 53 extending rearward of the vehicle body from the rear end of the second frame portion 52. Therefore, the space between the two lower frames 5 increases in the vehicle width direction at the rear of the second frame portion 52, so that the battery pack disposed in the space can be allowed to increase in the vehicle width direction. That is, the large battery pack 8 can be disposed below the floor panel 1 by utilizing this space.

The battery pack 8 disposed between the two lower frames 5 has a specific structure including a front end portion 85 positioned between the two first frame portions 51 and having a small dimension in the vehicle width direction (slightly smaller than the dimension of the space between the two first frame portions 51), an intermediate portion 86 positioned between the two second frame portions 52 and extending rearward of the vehicle body while having a gradually larger dimension in the vehicle width direction, and a body portion 87 positioned between the two third frame portions 53 and having a large dimension in the vehicle width direction (slightly smaller than the dimension of the space between the two third frame portions 53).

In this way, the large-sized battery pack 8 can be disposed under the floor panel 1 with a large space between the two lower frames 5, and thus the cruising distance of the electric vehicle can be extended.

In the above-described embodiments, the case where the vehicle substructure of the present invention is applied to an electric vehicle has been described, but the present invention is not limited thereto, and the vehicle substructure of the present invention is also applicable to a vehicle substructure of a hybrid vehicle driven by an electric motor and an internal combustion engine.

Claims

1. A vehicle lower portion structure including a floor panel, lower side frames joined to both sides of a lower surface of the floor panel in a vehicle width direction and extending in a vehicle length direction, and a battery pack disposed between the two lower side frames on a lower side of the floor panel, characterized in that:

each of the lower frames includes a first frame portion extending in the vehicle length direction, a second frame portion extending rearward of the vehicle body from a rear end of the first frame portion and inclined outward in the vehicle width direction, and a third frame portion extending rearward of the vehicle body from a rear end of the second frame portion.

2. The vehicle lower part structure according to claim 1, characterized in that:

the battery pack is disposed above a battery support plate having a plurality of cross plates extending in a vehicle width direction, both ends of each of the cross plates in the vehicle width direction are fastened to the lower frames on the corresponding side, and a distance between positions where the lower frames are fastened to the cross plates is set such that the distance in the second frame portion is larger than the distance in the third frame portion.

3. The vehicle lower portion structure according to claim 1 or 2, characterized in that:

In the longitudinal direction of the lower frame, the first frame portion and the third frame portion are each configured by joining together a plurality of frame members, and the second frame portion is configured by a single frame member.

4. The vehicle lower portion structure according to claim 1 or 2, characterized in that:

The second frame portion is formed of a member having a hat-shaped cross section, and forms a closed inner space with the floor panel, and reinforcing members connected to respective surfaces of the inner space are disposed in the inner space.