CN209776546U

CN209776546U - Vehicle lower structure

Info

Publication number: CN209776546U
Application number: CN201920284374.9U
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 portion structure includes a floor panel and a battery pack disposed below the floor panel, wherein the floor panel includes side horizontal portions that are positioned on both sides in a vehicle width direction and extend horizontally, an inclined portion that extends from an inner edge of the side horizontal portions in the vehicle width direction toward a center in the vehicle width direction and inclines upward, and an intermediate horizontal portion that extends horizontally from the inner edge of the inclined portion in the vehicle width direction toward the center in the vehicle width direction. With this structure, the height of the battery pack can be increased without lowering the position of the lower bottom surface of the battery pack.

Description

Vehicle lower structure

Technical Field

The utility model relates to a vehicle substructure.

Background

Conventionally, as a mounting method for mounting a battery pack in an electric vehicle, a method of supporting the battery pack on a lower side of a floor panel is known. In an electric vehicle adopting such a battery support system, a lower frame extending in the vehicle length direction is joined to a lower surface of a floor panel as a vehicle lower member. Fig. 8 is a simplified sectional view showing a battery pack supporting portion of a general electric vehicle in the related art. In fig. 8, an arrow LH indicates the left side of the vehicle body; arrow RH indicates the right side of the vehicle body. As shown in fig. 8, upper side frames b extending in the vehicle length direction are joined to both sides in the vehicle width direction of the upper surface of the floor panel a; lower frames c extending in the vehicle length direction are joined to both sides in the vehicle width direction of the lower surface of the floor panel a. The battery pack d is disposed between the two lower side frames c and supported by the floor panel a. Specifically, for example, support plates, not shown, are fastened to the two lower frames c, and the battery pack d is disposed on the support plates. Further, both ends of the floor panel a in the vehicle width direction are joined to the side members e, respectively.

In general, in order to extend the cruising distance of an electric vehicle, it is necessary to increase the size of the battery pack d. However, in the structure of the related art, the height size of the battery pack d is limited in consideration of the distance from the road surface. Therefore, a structure that can increase the height dimension of the battery pack d 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 part structure that can increase the size of a battery pack disposed on the lower side of a vehicle bottom plate.

as a technical solution to solve the above technical problem, the utility model provides a vehicle substructure, this vehicle substructure include the vehicle bottom plate, with the both sides of the car width direction of the upper surface of vehicle bottom plate are jointed and are followed the upside frame that the length direction of a vehicle extends, with the both sides of the car width direction of the lower surface of vehicle bottom plate are jointed and are followed the length direction of a vehicle extension downside frame, and the configuration is in two of vehicle bottom plate downside group battery between the downside frame, its characterized in that: the vehicle floor includes side horizontal portions that are positioned on both sides in the vehicle width direction of the vehicle floor and extend horizontally, inclined portions that extend from inner edges in the vehicle width direction of the side horizontal portions toward the center in the vehicle width direction and are inclined upward, and an intermediate horizontal portion that extends from inner edges in the vehicle width direction of the inclined portions toward the center in the vehicle width direction horizontally, and the upper frame and the lower frame are provided such that outer flange portions formed on respective outer edges in the vehicle width direction are joined to the side horizontal portions of the vehicle floor, respectively; inner flange portions formed on respective inner edges in the vehicle width direction are respectively joined to the intermediate horizontal portion of the floor panel.

The utility model discloses an above-mentioned vehicle substructure's advantage lies in, enables the group battery of vehicle bottom plate downside configuration and realizes the maximization. Specifically, since the middle horizontal portion of the floor panel is raised upward and raised above the side horizontal portions, the height of the space below the middle horizontal portion is increased, and the height of the battery pack can be increased without lowering the height of the lower bottom surface of the battery pack, thereby increasing the size of the battery pack. In addition, the joining between the upper frame and the floor panel and the joining between the lower frame and the floor panel utilize the side horizontal portions and the middle horizontal portion of the floor panel, respectively. Therefore, the joining between the floor panel and the side frames (the upper side frame and the lower side frame) can be realized by the joining between the horizontal portions as in the conventional art, and the height of the battery pack can be increased as described above, thereby increasing the size of the battery pack.

In the vehicle lower section structure according to the present invention, it is preferable that a groove portion that curves downward and extends in the vehicle length direction is formed in an intermediate portion of the inclined portion in the vehicle width direction. With this structure, the strength of the lower portion of the vehicle can be improved. Specifically, since the groove portion is formed in the intermediate portion of the inclined portion in the vehicle width direction, the rigidity of the inclined portion can be improved. Further, since the side horizontal portions and the intermediate horizontal portions provided on both sides (both sides in the vehicle width direction) of the inclined portion are used as the joining portions to be joined to the upper frame and the lower frame, the shape of the closed cross-sectional structure formed between the upper frame and the lower frame and the floor panel can be stably maintained, and the strength of the lower portion of the vehicle can be improved.

In addition, in the above vehicle lower section structure of the present invention, preferably, the vehicle bottom plate includes a seat belt fastening plate extending upward from an outer edge of the side horizontal section in the vehicle width direction, and a seat belt fixing device is fastened to the seat belt fastening plate. With this structure, the interior of the vehicle can be more aesthetically pleasing. Specifically, since the side horizontal portion of the floor panel is located at the lower end of the inclined portion and is located lower than the middle horizontal portion, the fastening portion of the seatbelt anchor on the side horizontal portion is not easily visible in the vehicle interior, and the aesthetic appearance of the vehicle interior can be 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 bottom view showing a vehicle lower part structure equipped with a battery pack.

Fig. 5 is a plan view of the front floor.

Fig. 6 is a perspective view showing the rear end portion of the front floor and the periphery thereof.

Fig. 7 is a sectional view taken along line VII-VII in fig. 1.

Fig. 8 is a simplified cross-sectional view showing a battery pack support part 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.

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 attaching operation of the battery pack 8 to the floor panel 1, and fig. 4 is a bottom view showing a lower structure of the vehicle to which the battery pack 8 is attached.

As shown in fig. 3 and 4, 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.

The vehicle lower portion structure of the present embodiment is mainly characterized by the structure on both sides in the vehicle width direction of the rear end portion of the front floor 11. Before describing the characteristic portions of the front floor 11, the overall structure of the front floor 11 will be described.

Fig. 5 is a plan view of the front floor 11. As shown in fig. 5, the front floor 11 is constituted by one integral plate member. In other words, the front floor 11 is constituted by a single member. The front floor 11 is a member obtained by press forming a steel plate.

The front floor 11 includes two side frame joint portions 14 serving as joint portions to be joined to the upper frame 3 and the lower frame 5 on each side. Each side frame joint 14 has a flat upper surface and a flat lower surface, and has a shape in plan view that matches the shape of the upper frame 3 and the lower frame 5 (the shape of each of the first frame portions 31, 51, the second frame portions 32, 52, and the third frame portions 33, 53).

The front floor 11 includes a first cross member joint portion 15 as a joint portion to be joined to the first cross member 61, and a second cross member joint portion 16 as a joint portion to be joined to the second cross member 62. The upper and lower surfaces of the beam joint portions 15 and 16 are flat surfaces and extend in the vehicle width direction.

In the front floor 11, a region between the first beam joint portion 15 and the front end edge of the front floor 11, a region between the first beam joint portion 15 and the second beam joint portion 16, and a region between the second beam joint portion 16 and the rear end edge of the front floor 11 are each formed in a wave plate shape. By forming a part of the front floor 11 in a wave plate shape in this manner, the strength of the front floor 11 can be increased.

Further, one suction portion 17 is provided on each of both sides in the vehicle width direction in the vicinity of the rear end edge of the front floor 11, and is circular in plan view. Each suction portion 17 is a portion for allowing a vacuum cup (not shown) to suck and hold when the front floor 11 is formed. Therefore, each suction portion 17 is formed in a circular shape having a diameter larger than the outer diameter of the vacuum cup, and has a flat upper surface. Further, since the upper surface of the first beam joint portion 15 is a flat surface as described above, both ends of the upper surface of the first beam joint portion 15 in the vehicle width direction can also be portions to be sucked and held by the vacuum cups.

Next, the characteristic portions of the front floor 11 will be explained. Fig. 6 is a perspective view showing the rear end portion of the front floor 11 and the periphery thereof. Fig. 7 is a sectional view taken along line VII-VII in fig. 1. As shown in fig. 6 and 7, the rear end portion of the front floor 11 includes: the vehicle body includes side horizontal portions 1A located on both sides in the vehicle width direction, inclined portions 1B extending from inner edges of the side horizontal portions 1A in the vehicle width direction toward the center in the vehicle width direction and inclined upward, and intermediate horizontal portions 1C extending horizontally from inner edges of the inclined portions 1B in the vehicle width direction toward the center in the vehicle width direction. Further, a second inclined portion 1D extending from the inner edge toward the center in the vehicle width direction and inclined upward, and a second intermediate horizontal portion 1E extending horizontally from the inner edge of the second inclined portion 1D toward the center in the vehicle width direction are formed on the inner edge of the intermediate horizontal portion 1C in the vehicle width direction.

In this manner, the rear end portion of the front floor 11 is configured such that the central portion in the vehicle width direction rises upward, and the space below the front floor 11 increases, that is, the height increases. Therefore, when the front battery pack 8 is disposed in the space below the floor panel 11 as described above, the height of the battery pack 8 can be increased without lowering the height of the lower bottom surface of the battery pack 8.

as a joining structure for joining the upper frames 3 and the lower frames 5 to the rear end portion of the front floor 11, as shown in fig. 7, an outer flange portion 3a extending horizontally is formed on the outer edge of the upper frame 3 in the vehicle width direction, and the lower surface of the outer flange portion 3a is joined to the upper surface of the side horizontal portion 1A of the front floor 11. Further, an inner flange portion 3b extending horizontally is also formed at the inner edge of the upper frame 3 in the vehicle width direction, and the lower surface of the inner flange portion 3b is joined to the upper surface of the intermediate horizontal portion 1C of the front floor 11. Similarly, the outer edge of the lower frame 5 in the vehicle width direction is formed with an outer flange portion 5a extending horizontally, and the upper surface of the outer flange portion 5a is joined to the lower surface of the side horizontal portion 1A of the front floor 11. Further, an inner flange portion 5b extending horizontally is also formed at the inner edge of the lower frame 5 in the vehicle width direction, and the upper surface of the inner flange portion 5b is joined to the lower surface of the intermediate horizontal portion 1C of the front floor 11.

Since the intermediate horizontal portion 1C is higher in position than the side horizontal portions 1A, the inner flange portions 3b and 5b of the upper frames 3 and the lower frames 5 are higher in position than the outer flange portions 3a and 5 a.

Further, a groove portion 1F that curves downward and extends in the vehicle length direction is formed in the intermediate portion of the inclined portion 1B in the vehicle width direction. Since the groove portion 1F is formed, the rigidity of the inclined portion 1B is improved. Further, since the side horizontal portions 1A and the intermediate horizontal portion 1C provided on both sides (both sides in the vehicle width direction) of the inclined portion 1B are used as joint portions to be joined to the upper frame 3 and the lower frame 5, the shape of the closed cross-sectional structure formed between each of the upper frame 3, the lower frame 5, and the front floor 11 can be stably maintained, and the strength of the vehicle lower portion can be improved.

The front floor 11 further includes a belt fastening plate 1G extending upward from the outer edge of the side horizontal portion 1A in the vehicle width direction, and the belt fastening plate 1G is fastened to a belt fastener not shown. Since the side horizontal portions 1A of the front floor 11 are located at the lower end of the inclined portion 1B, they are located lower than the intermediate horizontal portion 1C. Therefore, the fastening portion of the seatbelt anchor on the side horizontal portion 1A is not easily visible in the vehicle interior, and the aesthetic appearance in the vehicle interior is not impaired.

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 an automobile driven by an electric motor and an internal combustion engine.

Claims

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

The floor panel includes side horizontal portions positioned on both sides in the vehicle width direction and extending horizontally, inclined portions extending from inner edges in the vehicle width direction of the side horizontal portions toward the center in the vehicle width direction and inclining upward, and an intermediate horizontal portion extending horizontally from inner edges in the vehicle width direction of the inclined portions toward the center in the vehicle width direction,

The upper frame and the lower frame are arranged such that outer flange portions formed on respective outer side edges in the vehicle width direction are respectively engaged with the side edge horizontal portions of the floor panel; inner flange portions formed on respective inner edges in the vehicle width direction are respectively joined to the intermediate horizontal portion of the floor panel.

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

a groove portion that curves downward and extends in the vehicle length direction is formed in an intermediate portion of the inclined portion in the vehicle width direction.

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

The vehicle bottom plate includes a belt fastening plate extending upward from an outer edge of the side horizontal portion in the vehicle width direction, and a belt fastener is fastened to the belt fastening plate.