Vehicle under structure
By designing a vehicle lower structure including frame-like components, battery cover and transverse members, the problem of insufficient collision resistance performance of the vehicle lower structure in the prior art during side collision is solved, and higher collision resistance and structural simplification are achieved.
Patent Information
- Application Number
- CN202411220087.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-22
- Filing Date
- 2024-09-02
- Publication Date
- 2025-05-23
AI Technical Summary
In the case of collisions such as side collisions, the existing vehicle lower structure has insufficient collision resistance and needs to be improved to improve collision tolerance.
设计了一种车辆下部结构，包括框状部件、蓄电池罩和横向构件。框状部件由第一框架和第二框架组成，能够在内侧收纳蓄电池。蓄电池罩在框状部件的上表面延伸，并在前后及宽度方向上延伸。横向构件在宽度方向上延伸，连结第一框架，并向上突出至车厢内。
Through this structural design, the collision resistance of the vehicle in collision situations such as side collisions can be effectively improved, while no additional floor panels are required, which simplifies the structural design.
Smart Images
Figure CN120024189A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a vehicle lower structure. Background Art
[0002] A structure in which a battery storage space is formed inside a vehicle body frame is disclosed in Chinese Patent Application Publication No. 114940214. In the structure of Chinese Patent Application Publication No. 114940214, a battery cover is provided on the upper surface of the vehicle body frame, and a cooling plate is provided on the lower surface of the vehicle body frame. Summary of the invention
[0003] However, in the structure described in the above-mentioned Chinese Patent Application Publication No. 114940214, frame members for reinforcing the vehicle compartment, such as a floor cross member, need to be fixed to the battery cover, so there is room for improvement in ensuring the collision resistance performance against collisions such as side collisions.
[0004] An object of the present invention is to obtain a vehicle lower structure capable of ensuring collision resistance performance.
[0005] The vehicle lower structure involved in technical solution 1 includes: a frame-shaped component, which is formed into a frame shape in a manner including a first frame arranged in a pair of left and right and extending in the front-rear direction of the vehicle, and a second frame arranged in a pair of front and rear and extending in the width direction of the vehicle, and is capable of storing a battery on the inside; a battery cover, which is arranged on the upper surface of the frame-shaped component and extends in the front-rear direction of the vehicle and in the width direction of the vehicle; and a cross member, which extends in the width direction of the vehicle and connects the pair of left and right first frames, and protrudes upward from the battery cover to the inside of the vehicle compartment.
[0006] In the vehicle lower structure involved in the technical solution 1, a frame-shaped member is formed in a manner including a pair of left and right first frames extending in the front-rear direction of the vehicle and a pair of front and rear second frames extending in the width direction of the vehicle, and a battery can be stored inside the frame-shaped member. In addition, a battery cover is provided on the upper surface of the frame-shaped member, and the battery cover extends in the front-rear direction of the vehicle and the width direction of the vehicle. Thus, the battery stored inside the frame-shaped member can be covered from above by the battery cover.
[0007] Furthermore, a cross member extending in the vehicle width direction and connecting the pair of left and right first frames is provided, and the cross member protrudes upward from the battery cover into the vehicle cabin. Thus, the cross member can function as a floor cross member for reinforcing the vehicle cabin.
[0008] The vehicle lower structure according to claim 2 is characterized in that, in claim 1, both end portions of the cross member are overlapped on the upper surface of the first frame.
[0009] In the vehicle lower structure according to claim 2, the downward load acting on the cross member can be received by the first frame.
[0010] The vehicle lower structure according to claim 3 is the structure according to claim 1, wherein a mounting portion for mounting a vehicle seat is provided on the cross member.
[0011] In the vehicle lower structure according to claim 3, the load from the vehicle seat can be transmitted to the frame-shaped member via the cross member.
[0012] The vehicle lower structure according to claim 4 is that in claim 1, a side sill extending in the vehicle front-rear direction is provided on the vehicle width direction outer side relative to the frame-shaped member, and the first frame is attached to the side sill.
[0013] In the vehicle lower structure according to claim 4, the load input to the rocker during a side collision can be received by the frame-shaped member and can be transmitted to the rocker on the reverse collision side via the frame-shaped member.
[0014] The vehicle lower structure according to claim 5 is the structure described in any one of claims 1 to 4, wherein the battery cover is a floor panel constituting a floor of a vehicle compartment.
[0015] In the vehicle lower structure according to claim 5, since the battery cover is used as the floor panel, there is no need to provide a separate floor panel.
[0016] As described above, according to the vehicle lower structure according to the present invention, the collision resistance performance can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like symbols represent like elements, wherein:
[0018] Figure 1 It is a side perspective view schematically showing a main part of a vehicle to which the vehicle lower structure according to the embodiment is applied.
[0019] Figure 2 To express in Figure 1 A cross-sectional view of the section taken at line Ⅱ-Ⅱ.
[0020] Figure 3 To express in Figure 1A cross-sectional view taken along line III-III. Detailed Implementation Manner
[0021] Regarding the vehicle lower structure 10 involved in the implementation manner, it will be described with reference to the accompanying drawings.
[0022] Overall Structure of Vehicle Lower Structure 10
[0023] Figure 1 It is a side-sectional perspective view briefly showing the main part of a vehicle to which the vehicle lower structure 10 involved in the implementation manner is applied. In addition, the arrow mark FR, the arrow mark UP, and the arrow mark LH in the figure respectively represent the vehicle front direction, the vehicle upward direction, and the vehicle left direction in the vehicle to which the vehicle lower structure 10 is applied. In the following description, when the directions of front and rear, up and down, left and right are used without special description, it is assumed that they respectively represent the front and rear in the vehicle front-rear direction, the up and down in the vehicle up-down direction, and the left and right in the vehicle left-right direction (width direction).
[0024] As Figure 1 shown, the vehicle lower structure 10 of the present implementation manner includes a frame-like member 12 provided at the lower part of the vehicle. The frame-like member 12 is formed to be substantially rectangular frame-shaped in plan view and is configured to include a first frame 14 and a second frame 16.
[0025] The first frames 14 are provided in a pair on the left and right and are arranged so as to face each other in the vehicle width direction. In addition, the first frames 14 respectively extend in the vehicle front-rear direction and are formed in a closed cross-sectional shape.
[0026] Here, the first frame 14 is configured to include a side wall portion 14A that extends in the vehicle up-down direction and constitutes the side portion of the frame-like member 12, and a flange portion 14B that extends outward in the vehicle width direction from the lower end of the side wall portion 14A. In addition, the first frame 14 is formed to be substantially L-shaped when viewed from the vehicle front-rear direction.
[0027] The front end portions of the first frames 14 are connected to each other in the vehicle width direction by the second frame 16. Similarly, the rear end portions of the first frames 14 are connected to each other in the vehicle width direction by the second frame 16.
[0028] The second frames 16 are provided in a front-rear pair and are arranged in a manner opposed to each other in the front-rear direction of the vehicle. In addition, the second frames 16 extend in the vehicle width direction and are formed into a closed cross-section. In addition, the material and manufacturing method of the first frame 14 and the second frame 16 are not particularly limited. For example, the first frame 14 and the second frame 16 may be formed by extrusion molding of an aluminum alloy, etc. Moreover, for example, the first frame 14 and the second frame 16 may be formed integrally by casting. Furthermore, the first frame 14 and the second frame 16 may be formed by stamping steel plates, etc.
[0029] As described above, the frame-shaped member 12 is formed into a frame shape by a pair of first frames 14 and a pair of second frames 16. The frame-shaped member 12 is configured so that the battery BT (see FIG. 1 ) can be placed in the inner region of the frame-shaped member 12. Figure 3 ) for storage.
[0030] A base plate 18 is provided at the lower side of the frame-shaped member 12. The base plate 18 is formed into a substantially rectangular plate shape with the vehicle vertical direction as the thickness direction, and is fixed to the lower surface of the first frame 14 and the lower surface of the second frame 16. The fixing method of the base plate 18 is not particularly limited, and it may be mechanically joined by bolts, rivets, etc., or joined by welding, etc.
[0031] A cross member 20 is provided between the pair of front and rear second frames 16. The cross member 20 extends in the vehicle width direction and connects the pair of left and right first frames 14. That is, the right end of the cross member 20 is connected to the first frame 14 on the right side, and the left end of the cross member 20 is connected to the first frame 14 on the left side.
[0032] The cross member 20 is configured to include a pair of front and rear longitudinal wall portions 20A extending in the vehicle vertical direction and the vehicle width direction, and a top portion 20B that connects the upper ends of the longitudinal wall portions 20A. In addition, both end portions of the cross member 20 in the vehicle width direction are supported portions 20C that are overlapped on the upper surface of the first frame 14.
[0033] Here, a mounting hole 21 as a mounting portion for mounting a vehicle seat (not shown) is provided on the top portion 20B of the cross member 20. The mounting holes 21 are provided at four locations on the top portion 20B, and are each configured so that a seat rail of the vehicle seat can be fixed. In addition, the mounting portion is not limited to the mounting hole 21, and other structures may be used. For example, a stud bolt may be provided on the top portion 20B, and the stud bolt may be used as the mounting portion of the vehicle seat.
[0034] Figure 2To express in Figure 1 The cross-sectional view of the section cut at the II-II line. Figure 2 As shown, the lower end of the vertical wall portion 20A of the cross member 20 is bent along the base plate 18 to form a lower flange 20D. The lower flange 20D extends in the vehicle width direction and is overlapped on the upper surface of the base plate 18 and joined to the base plate 18.
[0035] Furthermore, both ends of the vertical wall portion 20A in the vehicle width direction form lateral flanges 20E bent along the first frame 14. The lateral flanges 20E are joined to the first frame 14 in a state of being overlapped on the side wall portions 14A of the first frame 14.
[0036] The lower end of the supported portion 20C of the cross member 20 forms an upper flange 20F bent along the first frame 14. The upper flange 20F is joined to the first frame 14 in a state of being overlapped on the upper surface of the first frame 14.
[0037] Here, a rocker 30 extending in the vehicle longitudinal direction is provided on the vehicle width direction outer side relative to the first frame 14 (frame-shaped member 12 ). The rocker 30 includes a rocker inner panel 32 and a rocker outer panel (not shown).
[0038] The lower sill inner panel 32 is formed to have a substantially hat-shaped cross section with the outer side in the vehicle width direction open, and an upper flange 30A extending upward from the vehicle is formed at the upper end of the lower sill inner panel 32. In addition, a lower flange 30B extending downward from the vehicle is formed at the lower end of the lower sill inner panel 32. The upper flange 30A and the lower flange 30B of the lower sill inner panel 32 are respectively joined to the upper flange and the lower flange of the lower sill outer panel.
[0039] A side wall portion 30C having a substantially C-shaped cross section is formed between the upper flange 30A and the lower flange 30B of the rocker inner panel 32. The side wall portion 30C extends in the vehicle vertical direction, and a step portion 30D is provided at the middle portion of the side wall portion 30C in the vehicle vertical direction. The side wall portion 30C is positioned at the outer side in the vehicle width direction due to the step portion 30D.
[0040] Here, the flange portion 14B of the first frame 14 and the rocker inner panel 32 are joined together by bolts and welding nuts, etc. Thus, the first frame 14 (frame-shaped member 12 ) is supported by the rocker 30 .
[0041] A battery cover 22 extending in the vehicle front-rear direction and the vehicle width direction is mounted on the upper surface of the frame-shaped member 12 .
[0042] Figure 3 To express in Figure 1 The cross-sectional view of the section cut at the III-III line. Figure 3 As shown, the battery cover 22 is a plate-shaped member with the vehicle vertical direction as the plate thickness direction. The vehicle width direction end of the battery cover 22 is bent toward the vehicle upper side along the rocker inner panel 32 and joined to the rocker inner panel 32 .
[0043] In addition, the rocker inner panel 32 is mounted on the upper surface of the first frame 14, and the space sandwiched by the battery cover 22 and the base plate 18 serves as a storage space for the battery BT. The battery BT is formed by sealing an electrode body in which a plurality of positive electrodes, negative electrodes, and separators are stacked in a housing. In this embodiment, as an example, a plurality of long thin plate-shaped batteries BT are arranged in the front-rear direction of the vehicle.
[0044] Here, in the present embodiment, the battery cover 22 serves as a floor panel constituting the floor of the vehicle compartment. Furthermore, the cross member 20 protrudes upward from the battery cover 22 into the vehicle compartment.
[0045] In addition, the cross member 20 and the battery cover 22 may be directly joined together or may be indirectly joined together via the first frame 14 or the like.
[0046] effect
[0047] Next, the operation of the vehicle lower structure 10 according to the present embodiment will be described.
[0048] In the vehicle lower structure 10 according to the present embodiment, Figure 1 As shown in FIG. 1 , the frame-shaped member 12 is formed to include a pair of left and right first frames 14 extending in the vehicle front-rear direction and a pair of front and rear second frames 16 extending in the vehicle width direction. The battery BT (see FIG. 1 ) can be mounted inside the frame-shaped member 12. Figure 3 ) for storage.
[0049] In addition, if Figure 3 As shown, a battery cover 22 is provided on the upper surface of the frame-shaped member 12, and the battery cover 22 extends in the vehicle front-rear direction and the vehicle width direction. Thus, the battery BT stored inside the frame-shaped member 12 can be covered from above (the vehicle compartment side) by the battery cover 22.
[0050] The cross member 20 connecting the pair of left and right first frames 14 protrudes upward into the vehicle more than the battery cover 22. Thus, the cross member 20 can function as a floor cross member for reinforcing the vehicle compartment. As a result, it is possible to ensure collision resistance performance in the event of a side collision or the like. In particular, in the present embodiment, by using the battery cover 22 as a floor panel, there is no need to provide a separate floor panel.
[0051] In addition, in this embodiment, if Figure 2 As shown in the figure, the supported portion 20C of the cross member 20 is overlapped on the upper surface of the first frame 14. Thus, the downward load acting on the cross member 20 can be received by the first frame 14. In particular, in the present embodiment, since the vehicle seat is mounted on the cross member 20, the load from the vehicle seat can be transmitted to the frame-shaped member 12 via the cross member 20.
[0052] Furthermore, in the present embodiment, since the first frame 14 is mounted on the rocker inner panel 32 (rocker 30), the load input to the rocker 30 during a side collision can be received by the frame-shaped member 12. In addition, a part of the collision load can be transmitted to the rocker 30 on the anti-collision side via the frame-shaped member 12.
[0053] Although the vehicle lower structure 10 involved in the present invention has been described above, it is obvious that it can be implemented in various ways without departing from the scope of the present invention. For example, although the battery cover 22 is used as a floor panel in the above embodiment, it is not limited to this. That is, a floor panel can also be provided above the battery cover 22. Even in this case, as long as the transverse member protrudes upward compared to the floor panel, it has the same effect as the above embodiment. However, from the viewpoint of reducing the number of components while ensuring the space in the vehicle cabin, a structure that uses both the battery cover and the floor panel is preferred.
[0054] In addition, in the above-mentioned embodiment, one cross member 20 is provided on the frame-shaped member 12, but the present invention is not limited thereto. For example, a plurality of cross members may be provided on the frame-shaped member 12. However, from the viewpoint of ensuring the storage area of the battery BT, it is preferable to provide only one cross member 20. In this case, by providing the cross member 20 at the center of the frame-shaped member 12 in the vehicle front-rear direction, load transfer can be effectively performed.
[0055] Furthermore, although in the above-mentioned embodiment, the lower side beam 30 is provided at the outer side of the frame-shaped member 12 in the vehicle width direction, it is not limited thereto. For example, the lower side beam may be removed and the first frame 14 may function as the lower side beam. In this case, the second frame 16 functions as a transverse member connecting the lower side beams. In addition, the storage area of the battery can be ensured to be larger in accordance with the amount of not providing the lower side beam.
[0056] The following supplementary notes are disclosed with respect to the above-mentioned embodiment.
[0057] (Note 1)
[0058] The vehicle lower structure includes: a frame-shaped member, which is formed into a frame shape in a manner including a first frame that is arranged in a pair of left and right and extends in the front-rear direction of the vehicle, and a second frame that is arranged in a pair of front and rear and extends in the width direction of the vehicle, and is capable of accommodating a battery on the inside; a battery cover that is arranged on the upper surface of the frame-shaped member and extends in the front-rear direction of the vehicle and in the width direction of the vehicle; and a cross member that extends in the width direction of the vehicle and connects the pair of left and right first frames, and protrudes upward into the vehicle compartment compared to the battery cover.
[0059] (Note 2)
[0060] In the vehicle lower structure described in Supplementary Note 1, both end portions of the cross member are overlapped on the upper surface of the first frame.
[0061] (Note 3)
[0062] In the vehicle lower structure described in Supplementary Note 1 or Supplementary Note 2, a mounting portion for mounting a vehicle seat is provided on the cross member.
[0063] (Note 4)
[0064] In the vehicle lower structure described in any one of Supplementary Notes 1 to 3, a side sill extending in the vehicle front-rear direction is provided on the vehicle width direction outer side relative to the frame-shaped member, and the first frame is attached to the side sill.
[0065] (Note 5)
[0066] In the vehicle lower structure described in any one of Supplementary Notes 1 to 4, the battery cover is a floor panel constituting a floor of a vehicle compartment.
Claims
1. A vehicle lower structure, comprising: a frame-shaped member, which is formed into a frame shape by including a first frame provided in a pair of left and right and extending in the front-rear direction of the vehicle, and a second frame provided in a pair of front and rear and extending in the width direction of the vehicle, and is capable of accommodating a battery inside; a battery cover provided on an upper surface of the frame-shaped member and extending in a vehicle front-rear direction and a vehicle width direction; The cross member extends in the vehicle width direction, connects the pair of left and right first frames, and protrudes upward from the battery cover into the vehicle cabin.
2. The vehicle lower structure according to claim 1, wherein: Both end portions of the cross member are overlapped on the upper surface of the first frame.
3. The vehicle lower structure according to claim 1, wherein: The cross member is provided with a mounting portion for mounting a vehicle seat.
4. The vehicle lower structure according to claim 1, wherein: A side sill extending in the front-rear direction of the vehicle is provided on the outer side in the vehicle width direction relative to the frame-shaped member. The first frame is mounted on the rocker.
5. The vehicle lower structure according to any one of claims 1 to 4, wherein: The battery cover is a floor panel constituting the floor of a vehicle compartment.