Lower structure of a vehicle

Abstract

A lower structure of a vehicle, which increases a mounting capacity of a battery while ensuring an energy absorption function at the time of a side collision. The lower structure of the vehicle includes a side beam (20) having a closed cross section, which is located at a side end portion of a floor panel (30) in a vehicle width direction and extends in a vehicle front-rear direction; a battery case (4) located below the floor panel and having a battery (41) housed in a housing space (40); and a fastening portion (6) that fastens the battery case to a lower portion of the side beam, the fastening portion being located at a position overlapping a cross-sectional center (C) of the side beam in the vehicle width direction or a position further outward than the cross-sectional center in the vehicle width direction.

Description

Technical Field

[0001] The technology disclosed here relates to the lower structure of the vehicle. Background Technology

[0002] Patent Document 1 describes a conventional vehicle body lower structure. This lower structure includes a battery pack for housing batteries located below the floor panel. A battery pack frame is mounted on the side wall of the battery pack. The battery pack frame has a fixing part and a frame body. The fixing part is fastened to the inner side member of the side beam at the lower part of the side beam, which is composed of an inner side member and an outer side member. The frame body stands upright along the inner wall of the side beam at a position inside the vehicle width direction of the side beam and engages with the side wall of the battery pack.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2018-188086 Summary of the Invention

[0004] The problem that the invention aims to solve In conventional vehicle body substructures, the side beams and battery pack frames are arranged in the width direction. The battery pack is located on the inside side of the battery pack frames in the width direction, thus shortening the width-direction length of the battery pack positioned between the left and right battery pack frames. Conventional substructures limit the capacity of the battery packs that can be mounted on the vehicle.

[0005] In conventional vehicle body lower structure designs, for example, the width of the battery pack frame in the vehicle width direction is considered to be narrower. If the width of the battery pack frame is narrowed, the battery pack can be correspondingly expanded outward in the vehicle width direction.

[0006] The battery pack frame, along with the side beams, functions to absorb energy during side impacts. If the width of the battery pack frame is narrowed, the energy it can absorb decreases. From the perspective of avoiding the input of impact loads to the battery pack, it is difficult to narrow the width of the battery pack frame.

[0007] The technology disclosed herein ensures energy absorption during side impacts and increases battery capacity.

[0008] Solution for solving the problem The technology disclosed herein relates to the lower structure of a vehicle. The lower structure of the vehicle includes: A side beam with a closed cross section is located at the side end of the floor panel in the vehicle width direction and extends in the vehicle longitudinal direction. A battery casing, located beneath the floor panel, and having a battery housed within a receiving space; and A fastening component secures the battery casing to the lower part of the side beam. The fastener is located in the vehicle width direction at a position that overlaps with the center of the cross section of the side beam, or at a position that is outside the vehicle width direction from the center of the cross section.

[0009] In the lower structure of this vehicle, the fastening part is located in the vehicle width direction at a position overlapping with the center of the side beam's cross-section or at a position further outward in the vehicle width direction than the center of the cross-section, fastening the side beam to the battery casing. Alternatively, the center of the cross-section can also be the geometric center of the side beam's cross-section.

[0010] A portion of the battery casing is located at least on the outer side of the fastener in the vehicle width direction. The fastener is located near the outer side of the side beam in the vehicle width direction, therefore the outer end of the battery casing in the vehicle width direction is located on the outer side of the fastener and close to the outer end of the side beam in the vehicle width direction.

[0011] If an initial collision load is applied to the side beam during a side collision, then an initial collision load is also applied to the battery casing at the same or substantially the same timing.

[0012] In addition, after the initial collision load is applied, the side beams and battery casing absorb energy in parallel.

[0013] As a result, the vehicle's lower structure is able to shorten the energy absorption path relative to the load input during a side collision.

[0014] Because the side beams and battery casing have a short energy absorption stroke, the battery storage space can be increased in the vehicle width direction. This increased storage space allows for a larger battery capacity.

[0015] Therefore, the aforementioned vehicle underbody structure can ensure energy absorption during side collisions and increase battery capacity.

[0016] Alternatively, the battery housing may have a frame located at the outer edge of the battery housing in the vehicle width direction and extending along the vehicle's longitudinal direction, forming the receiving space on the inner side in the vehicle width direction. The fastening part secures the frame to the lower part of the side beam.

[0017] In a side impact, collision loads are input to both the side beams and the frame. If the frame has high energy absorption capabilities, the vehicle's substructure can further shorten the energy absorption path during a side impact. This structure facilitates an increase in battery capacity.

[0018] Alternatively, the inner end of the side beam in the vehicle width direction may be located at the same position as the inner end of the frame in the vehicle width direction, or at a position that is further outward in the vehicle width direction than the inner end of the frame.

[0019] The fact that the inner end of the side beam in the vehicle width direction is at the same position as the inner end of the frame in the vehicle width direction means that the frame is not located on the inner side of the side beam in the vehicle width direction. That is, the frame is located on the outer side in the vehicle width direction, so the battery housing space can be expanded in the vehicle width direction.

[0020] In addition, if the inner end of the side beam in the vehicle width direction is located on the outer side of the vehicle width direction than the inner end of the frame in the vehicle width direction, the side beam is narrow in the vehicle width direction, which is beneficial to improving the ride comfort of the vehicle.

[0021] Alternatively, the outer end of the frame in the vehicle width direction may be located at approximately the same position as the outer end of the side beam in the vehicle width direction.

[0022] If the outer ends of the frame and the outer ends of the edge beam are roughly at the same position, then in a side collision, both the edge beam and the frame can withstand the initial collision load. From the initial stage of the collision, both the edge beam and the frame bear the load, which helps to shorten the energy absorption path.

[0023] Alternatively, the vehicle's lower structure may also include a lifting fitting mounted on the lower surface of the frame.

[0024] The vehicle can also bear the jacking load through the frame.

[0025] Alternatively, the lifting accessory may have a fixing part that extends through the frame in the vertical direction and is fixed to the lower part of the side beam.

[0026] The lifting load is input to the side beams via the fixing parts of the lifting fittings. The frame and side beams are able to ensure the required rigidity relative to the lifting load.

[0027] Alternatively, the frame may be an extruded aluminum alloy.

[0028] Aluminum alloy extrusions are suitable for battery casings due to their lightweight, corrosion resistance, and heat dissipation properties.

[0029] In addition, although the rigidity of aluminum alloy extrusions is relatively low, the necessary rigidity for jacking loads can be ensured through the side beams and frame.

[0030] Alternatively, the side beam may have an inner and an outer member that joins in the vehicle width direction. The fastening part is fastened to the outer part.

[0031] The outermost component is the outermost part of the side beam relative to the vehicle width direction. Because the fasteners are secured to the outermost component, the outermost end of the frame in the vehicle width direction is located close to the outermost end of the side beam in the vehicle width direction. The side beam and frame bear the initial collision load and can absorb energy side-by-side. This further shortens the energy absorption path relative to the load input.

[0032] Alternatively, the fastening part may include a collar disposed between the lower part of the side beam and the frame, and a bolt inserted into the collar and fastening the frame to the side beam.

[0033] The fastening collar can also be located at a position overlapping with the center of the side beam section, or it can be located on the outer side of the section center in the vehicle width direction.

[0034] Invention Effects The aforementioned vehicle underbody structure ensures energy absorption during side collisions and increases battery capacity. Attached Figure Description

[0035] Figure 1 This refers to a vehicle that uses the lower structure disclosed herein.

[0036] Figure 2 yes Figure 1 Sectional view II-II.

[0037] Figure 3 yes Figure 1 Sectional view III-III.

[0038] Figure 4 This is a graph comparing the amount of travel relative to the collision load with both the conventional lower structure and the lower structure disclosed herein.

[0039] Figure 5 This indicates a variation of the lower structure.

[0040] Figure 6 This indicates a variation of the lower structure.

[0041] Explanation of reference numerals in the attached figures 1 vehicle 20 edge beams 200 edge beam 21 Inner part 22. Outer parts 30 Floor Panels 4. Battery casing 41 batteries 5 Framework 51 Main Body 52 Extension 6 Fastening parts 61 rings 62 bolts 70 Lifting Accessories 71 Fixing part Detailed Implementation

[0042] Hereinafter, embodiments of the vehicle's lower structure will be described with reference to the accompanying drawings. The vehicle's lower structure described herein is illustrative. The vehicle's lower structure relates to a vehicle in which a battery is mounted under the floor.

[0043] Figure 1 This refers to vehicle 1, which uses the lower structure disclosed herein. Figure 1 The top image is a side view of the lower part of vehicle 1 from the left, and the bottom image is a bottom view of vehicle 1 from below, looking up at the floor. Additionally, Figure 2 yes Figure 1 Sectional view II-II, Figure 3 yes Figure 1 Sectional view III-III.

[0044] Furthermore, in each diagram, Fr represents the front of vehicle 1, Rr represents the rear of vehicle 1, Rt represents the right side of vehicle 1, and Lt represents the left side of vehicle 1. The left and right directions of vehicle 1 are in the vehicle width direction, In represents the inside in the vehicle width direction, Out represents the outside in the vehicle width direction, Up represents the top of vehicle 1, and Lw represents the bottom of vehicle 1.

[0045] The lower structure of vehicle 1 includes side beams 20. The side beams 20 are located on the right and left sides of the floor panel 30 in the vehicle width direction. The floor panel 30 extends in the vehicle longitudinal direction and the vehicle width direction to form the floor of the passenger compartment.

[0046] The side beam 20 extends continuously along the front-rear direction of the vehicle on the right and left sides of the floor panel 30, respectively.

[0047] like Figure 2 or Figure 3 As shown, the side beam 20 has an inner member 21 and an outer member 22. The inner member 21 and the outer member 22 are arranged in the vehicle width direction and engage with each other. The side beam 20 has a closed section formed by the inner member 21 and the outer member 22.

[0048] More specifically, the inner member 21 has a first flange 211 and a second flange 212, and is generally laterally cap-shaped. The outer member 22 has a third flange 223 and a fourth flange 224, and is generally laterally cap-shaped. The inner member 21 and the outer member 22 are made of, for example, steel plates machined into a cap shape.

[0049] The first flange 211 and the third flange 223 are opposite to each other and engage in the vehicle width direction at the upper part of the side beam 20. The second flange 212 and the fourth flange 224 are opposite to each other and engage in the vehicle width direction at the lower part of the side beam 20. The engagement position of the second flange 212 and the fourth flange 224 is offset inward in the vehicle width direction compared to the engagement position of the first flange 211 and the third flange 223. The engagement position of the second flange 212 and the fourth flange 224 is located near the inner sidewall 201 of the side beam 20 in the vehicle width direction. The inner sidewall 201 is the sidewall of the side beam 20 formed by the inner side member 21, and is the sidewall located inside the side beam 20 in the vehicle width direction.

[0050] The outer wall 202 of the side beam 20 is formed by the outer member 22, and the lower wall 203 of the side beam 20 is also substantially formed by the outer member 22. The outer wall 202 is the outer side wall of the side beam 20 located in the vehicle width direction. The lower wall 203 is the wall that constitutes the lower part of the side beam 20. The upper wall 204 of the side beam 20 is formed by the inner member 21 and the outer member 22. The upper wall 204 is the wall that constitutes the upper part of the side beam 20. The side end of the floor panel 30 in the vehicle width direction is joined to the inner member 21 in the upper wall 204.

[0051] The height H2 of the outer member 22 is higher than the height H1 of the inner member 21. The side beam 20 ensures high rigidity.

[0052] Furthermore, reference numeral 31 in the attached drawing refers to a crossbeam 31. The crossbeam 31 extends along the lower surface of the floor panel 30 in the vehicle width direction. The end of the crossbeam 31 in the vehicle width direction engages with the inner sidewall 201 of the side beam 20.

[0053] The lower structure of vehicle 1 includes a battery housing 4. The battery housing 4 is located below the floor panel 30.

[0054] The battery casing 4 has a battery 41 housed within a housing space 40. The battery 41 referred to here is a battery module containing multiple battery cells. For example... Figure 1 As shown, the battery housing 4 has multiple batteries 41. The multiple battery housings 4 are arranged in the longitudinal direction and the width direction of the vehicle.

[0055] Furthermore, the number of batteries 41 housed in the housing space 40 is not limited to a specific number. Alternatively, battery modules can be omitted, and individual battery cells can be housed directly in the housing space 40.

[0056] The battery housing 4 has a frame 5. The frame 5 is located at the outer edge, i.e., the right edge and the left edge, of the battery housing 4 in the vehicle width direction. The frame 5 extends continuously from the front end to the rear end of the side beam 20 in the vehicle longitudinal direction. The frame 5 forms a receiving space 40 on the inner side in the vehicle width direction.

[0057] The frame 5 has a horizontally T-shaped cross-section. The frame 5 has a main body 51. The main body 51 has an inner surface 511 that extends vertically and horizontally and extends longitudinally in the vehicle direction. The inner surface 511 forms a receiving space 40. The height of the main body 51 is approximately the same as the height of the battery 41 received in the receiving space 40.

[0058] A cover 42 is joined to the upper part of the main body 51. The cover 42 extends in the vehicle's longitudinal and width directions, forming the upper part of the receiving space 40. The central part of the cover 42 is positioned higher than the periphery, closer to the floor panel 30, relative to the outer periphery of the cover 42, which is joined to the upper part of the main body 51. Because the receiving space 40 expands vertically, it facilitates an increase in the battery 41's mounting capacity.

[0059] A base 43 is joined to the lower part of the main body 51. The base 43 extends in the longitudinal and width directions of the vehicle, forming the lower part of the receiving space 40. A battery 41 is placed on the base 43. The battery 41 is also supported by a bracket 53 fixed to the inner surface 511 of the main body 51.

[0060] Sealing elements 44 are respectively sandwiched between the main body 51 and the cover 42 and between the main body 51 and the base 43. The receiving space 40 is a sealed space.

[0061] The frame 5 has an extension 52. The extension 52 protrudes outward from the outer surface 512 of the main body 51 in the vehicle width direction. The extension 52 is located below the side beam 20.

[0062] The length of the extension 52 in the vehicle width direction is longer than the length of the main body 51 in the vehicle width direction. The length of the extension 52 in the vehicle width direction is the same as or approximately the same as the width of the side beam 20 in the vehicle width direction. Most of the main body 51 is located inside the side beam 20 in the vehicle width direction.

[0063] The extension 52 is located near the center of the main body 51 in the height direction. The height of the extension 52 is lower than the height of the main body 51. The extension 52 is located near the lower ends of the second flange 212 and the fourth flange 224 in the vertical direction. The upper part of the main body 51 overlaps with the second flange 212 and the fourth flange 224 in the vertical direction.

[0064] The extension 52 also extends continuously from the front end to the rear end of the side beam 20 in the front-rear direction of the vehicle.

[0065] Frame 5 is constructed, for example, from an extruded aluminum alloy. The main body 51 and the extension 52 are integrally formed. Frame 5 has multiple closed sections internally. As described later, frame 5 possesses rigidity to withstand lateral impact loads and ensures the required energy absorption. Furthermore, the cross-sectional shape of frame 5 shown in the figure is an example.

[0066] like Figure 1 As shown, the battery housing 4 also includes frames 54 located at the front and rear edges in the vehicle longitudinal direction. The frames 54 extend from the right frame 5 to the left frame 5 in the vehicle width direction, forming a receiving space 40.

[0067] The lower structure of vehicle 1 includes a fastening part 6. The fastening part 6 secures the battery casing 4 to the lower part of the side beam 20. More specifically, the fastening part 6 secures the extension 52 of the frame 5 to the lower wall 203 of the side beam 20. The fastening part 6 secures the frame 5 to the lower part of the side beam 20 at multiple locations spaced apart along the longitudinal direction of the vehicle.

[0068] The fastening part 6 has a collar 61. The collar 61 engages with the lower wall 203 of the side beam 20 and extends downward from the lower wall 203. The lower end of the collar 61 is inserted from above into a hole formed in the extension 52 of the frame 5.

[0069] The fastening part 6 has a bolt 62. The bolt 62 is inserted into the collar 61 from the lower surface of the extension 52 and passes through the lower wall 203 of the side beam 20. The extension 52 is supported by the lower wall 203 of the side beam 20, i.e., the outer part 22, by the engagement of the nut 63 with the bolt 62.

[0070] like Figure 3 As shown, the lower structure of vehicle 1 includes a jack-up attachment 70. The jack-up attachment 70 forms the jacking point for jacking up vehicle 1 (see also...). Figure 1 ).

[0071] The lifting fitting 70 is mounted on the lower surface of the extension 52 of the frame 5. The lifting fitting 70 also has a fixing part 71. The fixing part 71 extends upward from the upper surface of the lifting fitting 70 and passes through the extension 52 in the vertical direction. The upper end of the fixing part 71 is fixed to the lower wall 203 of the side beam 20 by bolts 72.

[0072] like Figure 2 As shown, in this lower structure, the side beam 20 overlaps with the frame 5 in the vehicle width direction (see reference). Figure 2 (Wf). That is, the side beam 20 does not protrude outwards from the frame 5 in the vehicle width direction. The side beam 20 and the frame 5 substantially overlap in the vertical direction.

[0073] Since the side beam 20 does not protrude further outward in the vehicle width direction than the frame 5, in a side collision, both the side beam 20 and the frame 5, which overlap vertically, bear the initial collision load. Furthermore, since the side beam 20 and the frame 5 substantially overlap vertically, they absorb energy side-by-side.

[0074] Figure 4 This diagram compares the previous lower structure with the lower structure disclosed herein. Figure 4 Figure 401 above schematically shows a conventional lower structure, and Figure 403 below schematically shows the lower structure disclosed herein.

[0075] In the conventional lower structure, the side beams are located on the outer side of the battery housing frame in the vehicle width direction. The side beams and the frame are arranged in the vehicle width direction. A battery housing space is formed on the inner side of the frame in the vehicle width direction.

[0076] When a side-impact load is applied to a vehicle with a conventional substructure, as shown in the load-stroke diagram 402, only the side beams bear the initial impact load. In this case, the substructure's stroke is determined solely by the rigidity of the side beams, and therefore the stroke relative to the load is relatively large.

[0077] Furthermore, after the edge beams are crushed and absorb the energy of the collision load, the frame begins to absorb the energy of the collision load.

[0078] In conventional substructures, only the side beams bear the initial collision load, and the side beams absorb energy in series with the frame. Compared to the substructure disclosed herein (see dashed lines in Table 402), the conventional substructure (see solid lines in Table 402) results in initial energy absorption loss during a collision. In conventional substructures, the travel distance must be extended by an amount corresponding to the energy absorption loss (see hollow arrows in Table 402). To ensure a longer travel distance, the battery housing space cannot be expanded outwards in the vehicle width direction in conventional substructures.

[0079] In the lower structure disclosed herein, as described above, the side beams 20 and frame 5, which overlap vertically, both bear the initial collision load. Furthermore, the side beams 20 and frame 5 absorb energy side-by-side from the initial stage of the collision. As shown in Table 404, the energy absorption loss in the initial stage of the collision disappears; therefore, compared to conventional lower structures, the lower structure disclosed herein can shorten the energy absorption path relative to the load input. As a result, in the lower structure disclosed herein, the storage space 40 for the battery 41 can be expanded outward in the vehicle width direction (see reference). Figure 2 (The arrow of Ws).

[0080] The increased housing space 40 allows for a larger battery capacity for the vehicle 1. The lower structure of the vehicle 1 disclosed herein, with its vertically arranged side beams 20 and frame 5, ensures energy absorption during side collisions and increases the battery capacity.

[0081] In addition, such as Figure 2As shown, the outer end of the extension 52 of the frame 5 is located approximately at the same position as the outer side wall 202 of the side beam 20 in the vehicle width direction. Therefore, in a side collision, both the side beam 20 and the frame 5 can withstand the initial collision load. Since both the side beam 20 and the frame 5 bear the load from the initial stage of the collision, this helps to shorten the energy absorption path.

[0082] Furthermore, the position of the outer end of the extension 52 and the outer wall 202 of the side beam 20 are not limited to being exactly the same, and slight offset is allowed. The outer end of the extension 52 may be located on the inner side in the vehicle width direction or on the outer side of the outer wall 202 of the side beam 20.

[0083] Furthermore, the main body 51 of the frame 5 has a height approximately the same as that of the battery 41. Because the main body 51 is relatively tall, it helps to ensure the high rigidity of the frame 5.

[0084] On the other hand, the extension 52 has a lower height than the main body 51. Because the extension 52, located below the side beam 20, is low in height, the battery housing 4 can be brought closer to the side beam 20 and the floor panel 30. This helps to prevent the vehicle height from increasing and expands the storage space 40 for the battery 41 in the vertical direction.

[0085] Furthermore, when a collision load is applied, the relatively tall main body 51 supports the shorter extension 52, thus ensuring high rigidity as a whole frame 5 and also facilitating energy absorption.

[0086] Furthermore, since the extension 52 is located at the center of the outer surface 512 of the main body 51 in the height direction, the frame 5 can exhibit stable deformation behavior during a side impact. Additionally, the extension 52 can also be located at the upper or lower end of the outer surface 512 of the main body 51 in the height direction. The cross-section of the frame 5 can also have an L-shape.

[0087] The extension 52 extends continuously from the front end to the rear end of the side beam 20 on the underside of the side beam 20 in the longitudinal direction of the vehicle. Regardless of where the collision load is input to the side of the vehicle 1, the extension 52 can withstand the initial collision load together with the side beam 20.

[0088] Since the extension 52 extends continuously in the longitudinal direction of the vehicle, the jacking accessory 70 is mounted on the lower surface of the extension 52. The jacking accessory 70 has a fixing part 71, so the jacking load is mainly input to the side beam 20 via the fixing part 71. The frame 5 and the side beam 20 are able to ensure the required rigidity relative to the jacking load partially input to the vehicle 1.

[0089] Frame 5 is an extruded aluminum alloy, which is suitable for battery housing 4 in terms of lightweight, corrosion resistance, and heat dissipation. On the other hand, the rigidity of frame 5, which is made of extruded aluminum alloy, is lower than that of side beam 20, which is made of steel plate. However, since the fixing part 71 inputs a lifting load to side beam 20, the rigidity required at the lifting point can be ensured by both side beam 20 and frame 5.

[0090] This construction will not adversely affect the seal 44 between the frame 5 and the cover 42, or the seal 44 between the frame 5 and the base 43. The battery housing 4 can stably maintain the airtight structure of the receiving space 40.

[0091] Furthermore, the extension 52 extends continuously from the front end to the rear end of the side beam 20 in the vehicle's longitudinal direction, therefore, as Figure 2 As shown by the double-dotted line, during the manufacture of vehicle 1, the hanger 10 supporting vehicle 1 supports vehicle 1 via the extension 52 of frame 5. The load input from hanger 10 to vehicle 1 is not localized but distributed. Even though hanger 10 supports frame 5, it does not adversely affect the seal 44 between frame 5 and cover 42 or between frame 5 and base 43. The frame 5 does not have a notch for hanger 10 to directly support side beam 20.

[0092] In addition, frame 5 is not limited to being made of extruded parts.

[0093] In the aforementioned lower structure of vehicle 1, the fastener 6 is located in the vehicle width direction at a position overlapping with the cross-sectional center C of the side beam 20. The cross-sectional center C mentioned here can also be the geometric center of the cross-section of the side beam 20, which has a generally quadrilateral shape.

[0094] The fastener 6 is located at a position overlapping with the cross-sectional center C of the side beam 20, therefore a portion of the frame 5 of the battery housing 4, i.e., a portion of the extension 52, is located at least on the outer side in the vehicle width direction beyond the fastener 6. In the vehicle width direction, the outer end of the extension 52 is located near the outer wall 202 of the side beam 20. Figure 2 In the example, the outer end of the extension 52 in the vehicle width direction is at the same position as the outer wall 202 of the side beam 20.

[0095] Since the outer end of the extension 52 in the vehicle width direction is at the same position as the outer side wall 202 of the side beam 20, as mentioned above, if the initial collision load is input to the side beam 20 during a side collision, the initial collision load is also input to the frame 5 at the same or substantially the same timing.

[0096] In addition, after the initial collision load is applied, the side beam 20 absorbs energy alongside the frame 5.

[0097] The fastener 6 is located in the vehicle width direction at a position that overlaps with the cross-sectional center C of the side beam 20, thereby enabling the lower structure of the vehicle 1 to shorten the energy absorption path relative to the load input during a side collision.

[0098] Because the energy absorption stroke of the side beam 20 and frame 5 is short, the storage space 40 of the battery 41 can be increased in the vehicle width direction. By increasing the storage space 40, the battery 41 of the vehicle 1 can be installed in a larger capacity.

[0099] Therefore, the lower structure of vehicle 1 can increase the battery 41's capacity while ensuring energy absorption during a side collision.

[0100] Furthermore, the second flange 212 and the fourth flange 224 of the side beam 20 are located between the fastening part 6 and the main body 51 to avoid interference with the fastening part 6 and the main body 51 of the frame 5.

[0101] Here, Figure 5 This shows a variation related to the position of the fastener 6. For example... Figure 5 As shown in Figure 501 above, the fastener 6 can also be located on the outer side of the cross-section center C of the side beam 20 in the vehicle width direction. Additionally, as... Figure 5 As shown in Figure 502 below, the collar 61 in the fastening part 6 can also be located at a position that overlaps with the center C of the cross section of the side beam 20.

[0102] In addition, examples of fastener 6 being located at a position overlapping with the cross-sectional center C of the side beam 20 or at a position further outward in the vehicle width direction than the cross-sectional center C include... Figure 2 or Figure 5 In addition to the examples mentioned above, various other examples can also be included.

[0103] In addition, such as Figure 2 As shown, the inner end of the side beam 20 in the vehicle width direction, i.e., the inner sidewall 201, is located on the outer side in the vehicle width direction compared to the inner end of the frame 5. The narrow side beam 20 in the vehicle width direction improves the passenger comfort of the vehicle 1.

[0104] Figure 6 This illustrates a variation related to the shape of the side beam. The inner wall 201 of the side beam 200 is located at the same position as the inner end of the frame 5 in the vehicle width direction. The side beam 200 overlaps the frame 5 entirely in the vehicle width direction. The main body 51 of the frame 5 is located below the inner member 21 of the side beam 20.

[0105] In other words, the frame 5 is not located inside the side beam 200 in the vehicle width direction. Since the frame 5 is located outside in the vehicle width direction, the storage space 40 for the battery 41 can be expanded in the vehicle width direction.

Claims

1. A lower structure for a vehicle, characterized in that, have: A side beam with a closed cross section is located at the side end of the floor panel in the vehicle width direction and extends in the vehicle longitudinal direction. A battery casing located below the floor panel and having a battery housed within a receiving space; as well as A fastening component secures the battery casing to the lower part of the side beam. The fastener is located in the vehicle width direction at a position that overlaps with the center of the cross section of the side beam, or at a position that is outside the vehicle width direction from the center of the cross section.

2. The lower structure of the vehicle according to claim 1, characterized in that, The battery housing has a frame located at the outer edge of the battery housing in the vehicle width direction and extending along the vehicle's longitudinal direction, forming the receiving space on the inner side in the vehicle width direction. The fastening part secures the frame to the lower part of the side beam.

3. The lower structure of the vehicle according to claim 2, characterized in that, The inner end of the side beam in the vehicle width direction is located at the same position as the inner end of the frame in the vehicle width direction, or at a position that is further outward in the vehicle width direction than the inner end of the frame.

4. The lower structure of the vehicle according to claim 2, characterized in that, The outer end of the frame in the vehicle width direction is located at approximately the same position as the outer end of the side beam in the vehicle width direction.

5. The lower structure of the vehicle according to claim 2, characterized in that, The vehicle's lower structure also includes a lifting fitting mounted on the lower surface of the frame.

6. The lower structure of the vehicle according to claim 5, characterized in that, The lifting fitting has a fixing part that extends through the frame in the vertical direction and is fixed to the lower part of the side beam.

7. The lower structure of the vehicle according to claim 5 or 6, characterized in that, The frame is an extruded aluminum alloy.

8. The lower structure of the vehicle according to claim 2, characterized in that, The side beam has an inner and an outer member that join in the vehicle width direction. The fastening part is fastened to the outer part.

9. The lower structure of the vehicle according to claim 2, characterized in that, The fastening part includes a collar disposed between the lower part of the side beam and the frame, and a bolt inserted into the collar and fastening the frame to the side beam.

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