Vehicle under structure

Abstract

The lower structure of the vehicle comprises side thresholds which are arranged on the left lower portion and the right lower portion of the vehicle and extend in the length direction of the vehicle, a transverse component erected on the left side threshold and the right side threshold, and a battery pack installed on a vehicle bottom plate. The inner side wall of the side sill is provided with an upper vertical wall part which is opposite to the transverse member in the vehicle width direction, a lower vertical wall part which is arranged on the lower side of the upper vertical wall part and retreats towards the outer side of the vehicle width direction relative to the upper vertical wall part, and a transverse wall part which connects the upper end of the lower vertical wall part and the lower end of the upper vertical wall part; the lower end portion of the upper longitudinal wall portion is provided with a protruding portion which extends towards the inner side of the vehicle below the cross member. More than one cross beam crossing the upper longitudinal wall part and the outer side wall of the side doorsill is arranged in the hollow part of the side doorsill; the battery pack is housed in a space between the cross member and the protruding portion and the lower vertical wall portions of the left and right side sills below the cross wall portion. Based on the structure, the storage space of the battery pack can be ensured, and the protection performance of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of vehicle lower structures. BACKGROUND

[0002] In the past, in the structure that battery pack is installed in the lower part of vehicle, in order to ensure the storage space of battery pack, the shell of battery pack is usually combined with side sill together, and the inner side wall of side sill is recessed to the outside of vehicle, and at the same time, longitudinal rib is arranged in the inside of side sill to ensure rigidity.

[0003] However, in the structure of the above prior art, since the inner side wall of side sill is recessed to the outside of vehicle, the impact absorption length in the direction of vehicle width is shortened. Thus, when vehicle side collision occurs, it is possible that the protection of battery pack cannot be ensured sufficiently, that is, the structure of prior art has the problem of insufficient protection performance of battery pack. SUMMARY

[0004] In view of the above situation, the utility model aims at providing a kind of vehicle lower structure that can ensure the storage space of battery pack and improve the protection performance of battery pack.

[0005] As a technical scheme for solving the above technical problem, the utility model provides a kind of vehicle lower structure, which comprises side sill extending in the direction of vehicle length at the lower left and right parts of vehicle, transverse member erected on the side sill of lower left and the side sill of lower right, and battery pack installed on the bottom plate of vehicle, characterized in that: the inner side wall of side sill is provided with upper longitudinal wall part arranged opposite to the transverse member in the direction of vehicle width, lower longitudinal wall part recessed to the outside of vehicle width relative to the upper longitudinal wall part at the lower side of the upper longitudinal wall part, and transverse wall part connecting the upper end of lower longitudinal wall part with the lower end of upper longitudinal wall part and extending in the direction of vehicle width; at the lower end of upper longitudinal wall part, protruding part extending below the transverse member in the direction of vehicle width towards the inside of vehicle is arranged; the side sill has hollow closed cross-sectional shape, and one or more than one transverse beam for transmitting load is arranged in the hollow part, which spans the upper longitudinal wall part and the outer side wall of side sill; the battery pack is stored in the space between the lower longitudinal wall part of side sill of lower left and the lower longitudinal wall part of side sill of lower right below the transverse member and the protruding part and the transverse wall part.

[0006] Based on the above vehicle lower structure of the utility model, since the lower longitudinal wall part is recessed to the outside of vehicle width relative to the upper longitudinal wall part, the storage space of battery pack is the space between the lower longitudinal wall part of side sill of lower left and the lower longitudinal wall part of side sill of lower right below the transverse member and the protruding part and the transverse wall part, and the end part of both sides of battery pack can enter the space formed below the transverse wall part, so the storage space of battery pack can be ensured sufficiently.

[0007] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion.

[0008] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion.

[0009] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion.

[0010] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion.

[0011] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion.

[0012] Further, in the vehicle lower structure described above, preferably, the side rocker has a cross beam connected to the lateral wall portion, and a position height of the cross beam and the lateral wall portion in the vehicle height direction is identical to a position height of the protruding portion. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a perspective view showing an outline structure of an embodiment of the vehicle lower structure of the present application.

[0014] Fig. 2 is a sectional view showing a section of the right side rocker.

[0015] Fig. 3 is a perspective view showing a section of the intermediate cross member. DETAILED DESCRIPTION

[0016] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0017] Fig. 1 is a perspective view showing an outline structure of one embodiment of a vehicle lower structure of the present application. In the figure, "Fr" indicates a front side of the vehicle, "Lh" indicates a left side of the vehicle, and "Rh" indicates a right side of the vehicle.

[0018] The vehicle lower structure 1 shown in Fig. 1 includes a side rocker 2, a front cross member 3, an intermediate cross member 4, a rear cross member 5, a floor panel 6, a battery pack 7, and the like.

[0019] The vehicle to which the vehicle lower structure of the present embodiment is applied is a vehicle that travels using power supplied from the battery pack 7 to drive a motor (not shown).

[0020] In the left lower portion and the right lower portion of the vehicle, the side rocker 2 extending in the vehicle longitudinal direction is provided, but only the side rocker of the right lower portion is shown in Fig. 2.

[0021] The front cross member 3 is provided at the front side of the front seats, the intermediate cross member 4 is provided at the rear side of the front seats, and the rear cross member 5 is provided at the side of the rear seats. The front cross member 3, the intermediate cross member 4, and the rear cross member 5 extending in the vehicle width direction are arranged in parallel with each other at intervals in the vehicle longitudinal direction and are supported on the side rocker 2 of the left lower portion and the side rocker 2 of the right lower portion.

[0022] The floor panel 6 is arranged below the side rocker 2, the front cross member 3, the intermediate cross member 4, and the rear cross member 5.

[0023] As shown by two-dot chain lines in Fig. 1, the battery pack 7 is installed in a space (a space facing both) between the side rocker 2 of the left lower portion and the side rocker 2 of the right lower portion on the floor panel 6.

[0024] Fig. 2 is a sectional view showing a section of the side rocker 2 of the right lower portion. In the figure, "Up" indicates an upper side of the vehicle, "Outside" indicates an outside (right side) in the vehicle width direction, and "Inside" indicates an inside in the vehicle width direction.

[0025] As shown in Fig. 2, the side rocker 2 has a hollow closed cross-sectional shape. That is, the side rocker 2 has an inside wall on the inside of the vehicle and an outside wall on the outside of the vehicle, and a hollow portion is formed between the inside wall and the outside wall at a prescribed interval.

[0026] The inside wall includes an upper vertical wall portion 21, a lower vertical wall portion 22, and a horizontal wall portion 23. The upper vertical wall portion 21 is arranged so as to face the front cross member 3, the intermediate cross member 4, and the rear cross member 5 in the vehicle width direction. The lower vertical wall portion 22 is arranged so as to retreat toward the outside in the vehicle width direction with respect to the upper vertical wall portion 21 on the lower side of the upper vertical wall portion 21 and faces the battery pack 7 in the vehicle width direction. The horizontal wall portion 23 is arranged so as to connect the upper end of the lower vertical wall portion 22 and the lower end of the upper vertical wall portion 21 and extend in the vehicle width direction.

[0027] The outer side wall includes an inclined wall portion opposite the upper longitudinal wall portion 21, and a straight wall portion opposite the lower end portion of the upper longitudinal wall portion 21 and the lower longitudinal wall portion 22. The inclined wall portion extends obliquely from the upper end of the straight wall portion toward the upper side and the inner side of the vehicle, so that the thickness of the side rocker 2 in the vehicle width direction becomes smaller as it approaches the upper end. The straight wall portion extends along the vehicle height direction.

[0028] In addition, in the hollow portion of the side rocker 2 (the interior of the side rocker 2, i.e., the space between the inner side wall and the outer side wall), three cross beams (201 to 203), three longitudinal beams (204 to 206), and one inclined beam 207 are provided for transmitting loads.

[0029] Among the three cross beams (201 to 203) of the side rocker 2, in the vehicle height direction, the first cross beam 201 is located at the uppermost position, the second cross beam 202 is located at the middle, and the third cross beam 203 is located at the lowermost position. The first cross beam 201 and the second cross beam 202 are arranged so as to span the upper longitudinal wall portion 21 and the outer side wall (inclined wall portion) of the side rocker 2. The third cross beam 203 is configured so that its position height coincides with the position height of the transverse wall portion 23 in the vehicle height direction, and is integrated with the transverse wall portion 23.

[0030] Fig. 3 is a perspective view showing a cross section of the intermediate cross member 4, in which "Fr" indicates the front side of the vehicle, and "Lh" indicates the left side of the vehicle.

[0031] As shown in Fig. 3, the intermediate cross member 4 has a hollow closed cross-sectional shape, and two cross beams (41, 42) and one longitudinal beam 43 are provided in the hollow portion thereof for transmitting loads. Among the two cross beams (41, 42), in the vehicle height direction, the first cross beam 41 is located at the upper position, and the second cross beam 42 is located at the lower position. The first cross beam 41 and the second cross beam 42 are arranged so as to span the front surface and the rear surface of the intermediate cross member 4. In addition, at the lower end portion of the front surface of the intermediate cross member 4, a eave portion 44 extending toward the front side of the vehicle is provided.

[0032] In addition, although not shown in detail, the front cross member 3 has the same structure as the intermediate cross member 4, except that the eave portion thereof (corresponding to the eave portion 44 of the intermediate cross member 4) is arranged to extend toward the rear side of the vehicle.

[0033] Next, the characteristic portions of the present application will be described in more detail.

[0034] As shown in Fig. 2, at the lower end portion of the upper longitudinal wall portion 21 of the inner side wall of the side rocker 2, a protruding portion 24 extending toward the inner side of the vehicle in the vehicle width direction below the cross members (3 to 5) is provided.

[0035] The battery pack 7 is housed in the space between the lower vertical wall portion 22 of the left lower side rocker and the lower vertical wall portion 22 of the right lower side rocker below the cross members (3-5) and the protruding portion 24 and the horizontal wall portion 23. Here, since the lower vertical wall portion 22 is retreated to the outside in the vehicle width direction with respect to the upper vertical wall portion 21, the housing space of the battery pack 7 is expanded from below the cross members (3-5) to below the horizontal wall portion 23, and thus the end portions on both sides of the battery pack 7 can enter the space formed below the horizontal wall portion 23.

[0036] In addition, the first cross beam 201 of the side rocker 2 is arranged such that the position height in the vehicle height direction coincides with the position height of the first cross beam 41 of the intermediate cross member 4. The second cross beam 202 of the side rocker 2 is arranged such that the position height in the vehicle height direction coincides with the position height of the second cross beam 42 of the intermediate cross member 4. Further, the third cross beam 203 of the side rocker 2 and the horizontal wall portion 23 are arranged such that the position height in the vehicle height direction coincides with the position height of the protruding portion 24.

[0037] In this way, the first cross beam 201 of the side rocker 2 and the first cross beam 41 of the intermediate cross member 4, the second cross beam 202 of the side rocker 2 and the second cross beam 42 of the intermediate cross member 4, and the third cross beam 203 of the side rocker 2 and the horizontal wall portion 23 and the protruding portion 24 are respectively located in the same plane, and thus the side rocker 2 is more likely to transmit the collision load in the vehicle width direction to the intermediate cross member 4.

[0038] In addition, as shown in FIG. 1, the rear cross member 5 located at the rear of the vehicle is configured in a flat plate shape; the front cross member 3 located at the front side of the vehicle has the same cross-sectional structure as the intermediate cross member 4 except that the eave portion extends toward the rear side of the vehicle, and thus the detailed description thereof is omitted here.

[0039] As described above, the vehicle lower structure 1 according to the above embodiment of the present application can sufficiently ensure the housing space of the battery pack 7 since the end portions on both sides of the battery pack 7 can enter the space formed below the horizontal wall portion 23.

[0040] Meanwhile, since the first cross member 201 of the side rocker 2 and the first cross members of the intermediate cross member 4 and the front cross member 3, the second cross member 202 of the side rocker 2 and the second cross members of the intermediate cross member 4 and the front cross member 3, and the third cross member 203 of the side rocker 2 and the lateral wall portion 23 and the protruding portion 24 are respectively located on the same plane, when the side rocker 2 is deformed to the inside in the vehicle width direction due to a side collision of the vehicle, for example, the first cross member 201 and the second cross member 202 of the side rocker 2 come into contact with the first cross members and the second cross members of the intermediate cross member 4 and the front cross member 3 to directly transmit the collision load received thereby to the respective cross members of the intermediate cross member 4 and the front cross member 3 located above the battery pack 7, and at the same time, the third cross member 203 of the side rocker 2 pushes the protruding portion 24 via the lateral wall portion 23 to the inside in the vehicle width direction, thereby absorbing the collision load by the movement of the protruding portion 24. As a result, the collision load transmitted to the battery pack 7 can be greatly reduced, and the protection performance of the battery pack 7 can be effectively improved.

[0041] In addition, the present application is not limited to the above-described embodiments, and various modifications and applications can be made. For example, in the present embodiment, the rear cross member 5 located at the rear portion of the vehicle is configured in a solid flat plate shape, but the same hollow closed cross-sectional shape as the intermediate cross member 4 can be adopted.

Claims

1. A vehicle lower structure, comprising side sills extending along the length of the vehicle at its lower left and lower right portions, a transverse member mounted on the lower left and lower right side sills, and a battery pack mounted on the floor of the vehicle, characterized in that: The inner wall of the side sill has an upper longitudinal wall portion that is arranged facing the transverse member in the vehicle width direction, a lower longitudinal wall portion that is recessed to the outside of the upper longitudinal wall portion in the vehicle width direction relative to the upper longitudinal wall portion on the lower side of the upper longitudinal wall portion, and a transverse wall portion that connects the upper end of the lower longitudinal wall portion to the lower end of the upper longitudinal wall portion and extends in the vehicle width direction. At the lower end of the upper longitudinal wall, a protrusion extending toward the inside of the vehicle along the vehicle width direction is provided below the transverse member; The side sill has a hollow closed cross-section shape, and one or more crossbeams for transmitting loads are provided in the hollow part, the crossbeams spanning the upper longitudinal wall and the outer wall of the side sill. The battery pack is housed in the space between the lower longitudinal wall of the lower left side sill and the lower longitudinal wall of the lower right side sill, below the transverse member, the protrusion, and the transverse wall.

2. The vehicle substructure as described in claim 1, characterized in that: The transverse member has a hollow closed cross-section shape, and one or more crossbeams for transmitting loads are provided in the hollow part, the crossbeams spanning the front and rear surfaces of the transverse member. The position height of the crossbeam of the transverse member in the vehicle height direction is the same as the position height of the crossbeam of the side sill.

3. The vehicle substructure as described in claim 1, characterized in that: The side sill has a crossbeam connected to the transverse wall portion, and the position height of the crossbeam and the transverse wall portion is consistent with the position height of the protrusion in the vehicle height direction.

4. The vehicle substructure as described in any one of claims 1 to 3, characterized in that: The lateral members refer to the front lateral member, the middle lateral member, and the rear lateral member, which are spaced apart and arranged parallel to each other in the length direction of the vehicle.

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