vehicle

Abstract

To improve collision safety performance while allowing for seat repositioning. [Solution] The vehicle comprises a plurality of longitudinal structural members arranged at intervals from each other and extending in the longitudinal direction of the vehicle, a plurality of upper cross members arranged parallel to each other and each connected to the longitudinal structural members, and at least one lower cross member positioned lower than the upper cross members and connected to the longitudinal structural members, wherein the lower cross member, the longitudinal structural members and the upper cross members are arranged to form a truss structure.

Description

Technical Field

[0001] The present invention relates to a vehicle.

Background Art

[0002] Conventionally, in a vehicle, a cross member is provided in the vehicle width direction and absorbs a collision load during a side collision. Therefore, the cross member is required to have higher strength to absorb the collision load. In order to improve the collision safety performance, for example, in Patent Document 1, a front side tunnel member, a floor lower inclined member, and a floor upper inclined member are configured to form a substantially X shape in a plan view of the vehicle, and a truss shape is formed in the plan view of the vehicle by the front side tunnel member, a cross member closing portion, a floor upper inclined member closing portion, and a rear side tunnel member closing portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, the plurality of cross members forming the truss shape disclosed in Patent Document 1 are located on the same surface side with respect to the cabin floor. That is, the truss shape disclosed in Patent Document 1 is configured in a horizontal plane. However, further proposals for technologies to improve the collision safety performance are desired.

[0005] Therefore, an object of the present invention is to improve the collision safety performance.

Means for Solving the Problems

[0006] In order to solve the above problems, a vehicle according to an embodiment of the present invention is Multiple longitudinal structural members are arranged at intervals from each other and extend in the front-to-rear direction of the vehicle, Multiple upper cross members are arranged parallel to each other and connected to the vertical structural member, At least one lower cross member is positioned lower than the upper cross member and is connected to the vertical structural member, Equipped with, The lower cross member, the vertical structural member, and the upper cross member are arranged to form a truss structure. [Effects of the Invention]

[0007] According to the present invention, it is possible to improve collision safety performance. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a plan view showing the schematic configuration of the upper side of the floor structure of a vehicle according to an embodiment of the present invention. [Figure 2] Figure 2 is a bottom view showing a schematic configuration of the bottom side of the floor structure of the vehicle according to the same embodiment. [Figure 3] Figure 3 is a schematic diagram showing seats arranged on the upper cross member according to the same embodiment. [Figure 4] Figure 4 is a partially cutaway plan view showing the upper side of the lower cross member and longitudinal member joined together according to the same embodiment. [Figure 5] Figure 5 is a partially cutaway perspective view showing the unfolded state of the joint between the lower cross member and the longitudinal member according to the same embodiment. [Figure 6] Figure 6 is a schematic diagram showing the truss structure in a vehicle according to the same embodiment. [Figure 7] Figure 7 is a schematic diagram showing the connection position between the seat leg and the guide rail according to the same embodiment. [Figure 8] Figure 8 is a schematic diagram showing the movement of the seat according to the same embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the attached drawings. The specific dimensions, materials, numerical values, etc., shown in these embodiments are merely examples to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0010] <Vehicle 1 configuration> The configuration of vehicle 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 6.

[0011] Figure 1 is a plan view showing the schematic configuration of the upper side of the floor structure of a vehicle according to an embodiment of the present invention. Figure 2 is a bottom view showing the schematic configuration of the lower side of the floor structure of a vehicle according to the same embodiment. Figure 3 is a schematic diagram showing seats arranged on the upper cross member according to the same embodiment. As illustrated in Figures 1 and 2, the vehicle 1 has a cross member 10, a side sill 22, a longitudinal member 24, a cabin floor member 30, a battery unit 40, a guide rail 50, and seats 60.

[0012] The cross member 10 is a structural member installed across the vehicle width direction of the vehicle 1. The cross member 10 is included in the understructure of the vehicle body of the vehicle 1. The cross member 10 has an upper cross member 12 and a lower cross member 14.

[0013] The upper cross member 12 is a structural member provided in a pair on the left and right sides in the vehicle width direction, as illustrated in Figure 1. The upper cross member 12 includes an upper cross member 12A located on the right side of the vehicle 1, and an upper cross member 12B located on the left side of the vehicle 1. Note that the upper cross member 12A and the upper cross member 12B have substantially the same configuration, and unless there is a need to distinguish between them, they are simply referred to as the upper cross member 12. The upper cross member 12 is located higher than the lower cross member 14, which will be described later, in the height direction of the vehicle 1. Specifically, the upper cross member 12 is joined to the upper surface of the cabin floor member 30. The upper cross member 12 is an example of an upper cross member according to the present invention.

[0014] The upper cross member 12A comprises a front cross member 12A1 and a rear cross member 12A2. The front cross member 12A1 and the rear cross member 12A2 are arranged parallel to each other. In other words, the multiple upper cross members 12A are arranged parallel to each other. Each upper cross member 12A is also connected to the side sill 22 and the longitudinal member 24, respectively. The two upper cross members 12A are positioned diagonally between the side sill 22 or longitudinal member 24 extending in the longitudinal direction L of the vehicle 1 and the lower cross member 14 extending in the vehicle width direction W of the vehicle 1.

[0015] One end of the front cross member 12A1 is connected to the side sill 22A. The other end of the front cross member 12A1 is connected to the longitudinal member 24. One end of the rear cross member 12A2 is connected to the side sill 22A. The other end of the rear cross member 12A2 is connected to the front cross member 12B1. The rear cross member 12A2 is connected to the longitudinal member 24 at a position where it intersects with the longitudinal member 24. The front cross member 12A1 and the rear cross member 12A2 may also be provided with grooves having a rail-shaped cross section that can replace the rail portion of the guide rail 50 described later, in the longitudinal direction. These grooves may extend along the longitudinal direction of the front cross member 12A1 or the rear cross member 12A2.

[0016] The upper cross member 12B is arranged to be line-symmetrical with the upper cross member 12A. Specifically, the two upper cross members 12B are provided to be line-symmetrical with the two upper cross members 12A with the vertical through member 24 as the symmetry reference. The upper cross member 12B includes a front cross member 12B1 and a rear cross member 12B2. The front cross member 12B1 and the rear cross member 12B2 are arranged parallel to each other. That is, the plurality of upper cross members 12B are arranged parallel to each other. Also, each upper cross member 12B is coupled to the side sill 22 and the vertical through member 24 respectively. The two upper cross members 12B are arranged obliquely between the side sill 22 extending in the longitudinal direction L of the vehicle 1 and the vertical through member 24.

[0017] One end of the front cross member 12B1 is coupled to the side sill 22B. The other end of the front cross member 12B1 is coupled to the vertical through member 24. Also, one end of the rear cross member 12B2 is coupled to the side sill 22B. The other end of the rear cross member 12A2 is coupled to the front cross member 12A1. Also, the rear cross member 12B2 is coupled to the vertical through member 24 at a position where it intersects the vertical through member 24. Also, the front cross member 12B1 and the rear cross member 12B2 may be provided with a groove having a rail-shaped cross section that can be replaced with the rail of the guide rail 50 described later. The groove may extend along the length direction of the front cross member 12B1 or the rear cross member 12B2.

[0018] The lower cross member 14 is a structural member that extends in the vehicle width direction of the vehicle 1, as illustrated in Figure 2. The lower cross member 14 is positioned perpendicular to the side sill 22 and the longitudinal member 24. The lower cross member 14 is connected to the side sill 22 and the longitudinal member 24. In the height direction of the vehicle 1, the lower cross member 14 is positioned lower than the upper cross member 12. Specifically, the lower cross member 14 is joined to the bottom surface of the cabin floor member 30. One end of the lower cross member 14 is connected to the side sill 22A. The other end of the lower cross member 14 is connected to the side sill 22B. The lower cross member 14 is an example of a lower cross member according to the present invention.

[0019] The lower cross member 14 includes lower cross members 14A, 14B, and 14C. When there is no need to distinguish between them, the lower cross members 14A, 14B, and 14C are simply referred to as the lower cross member 14. The multiple lower cross members 14 are arranged parallel to each other and spaced apart in the longitudinal direction L of the vehicle 1. One end of each of the lower cross members 14A to 14C is connected to the side sill 22A. The other end of each of the lower cross members 14A to 14C is connected to the side sill 22B. That is, at least one lower cross member 14 is directly or indirectly connected to the side sill 22 or the longitudinal member 24.

[0020] The lower cross member 14A is located on the front side of the vehicle 1 in the longitudinal direction L, and is positioned between the two side sills 22A and 22B. One end and the other end of the lower cross member 14A are joined to the two side sills 22A and 22B, respectively.

[0021] The lower cross member 14B is located on the central side in the longitudinal direction L of the vehicle 1 and is positioned between the two side sills 22A and 22B. One end and the other end of the lower cross member 14 are joined to the two side sills 22A and 22B, respectively. The lower cross member 14B also includes a lower cross member body 142B extending in the vehicle width direction W of the vehicle 1, and a flange portion 144B provided on the upper end surface of the lower cross member body 142B. The flange portion 144B is provided on both sides of the lower cross member body 142B in the longitudinal direction L and extends along the lower cross member body 142B in the vehicle width direction W. The lower cross member 14B is positioned with its flange portion 144B in contact with the bottom surface of the cabin floor member 30. Note that the same configuration of the flange portion 144B of the lower cross member 14B can be adopted for the lower cross members 14A and 14C.

[0022] The lower cross member 14C is located on the rear side of the vehicle 1 in the longitudinal direction L, and is positioned between the two side sills 22A and 22B. One end and the other end of the lower cross member 14C are joined to the two side sills 22A and 22B, respectively. The lower cross member 14C can be omitted if the battery unit 40, which will be described later, is provided.

[0023] The side sills 22, as illustrated in Figure 1, are structural members located on both sides of the vehicle width direction W of the vehicle 1 and extending in the longitudinal direction L of the vehicle 1. The side sills 22 are an example of a longitudinal structural member according to the present invention. The side sills 22 include a side sill 22A located at the right end of the vehicle width direction W of the vehicle 1 and a side sill 22B located at the left end of the vehicle width direction W of the vehicle 1. Note that the side sills 22A and 22B have substantially the same configuration and are simply referred to as side sills 22 unless there is a need to distinguish between them. The two side sills 22A and 22B are joined to both ends of the cabin floor member 30 in the vehicle width direction W, respectively. Note that the side sills 22 are an example of a longitudinal structural member according to the present invention.

[0024] As illustrated in Figure 1, the longitudinal member 24 is a structural member located in the center of the vehicle width direction W of the vehicle 1 and extending in the longitudinal direction L of the vehicle 1. The longitudinal member 24 is an example of a longitudinal structural member according to the present invention. One end (front end) of the longitudinal member 24 extends to a position overlapping with the front cross member 12A1, the front cross member 12B1, and the lower cross member 14A. The other end (rear end) of the longitudinal member 24 extends to a position overlapping with the lower cross member 14C. The longitudinal member 24 also includes a longitudinal member body 240 extending in the longitudinal direction L of the vehicle 1 and a flange portion 242 provided on the lower end surface of the longitudinal member body 240. The flange portion 242 is provided on both sides of the longitudinal member body 240 in the vehicle width direction W and extends in the longitudinal direction L along the longitudinal member body 240. The longitudinal member 24 is positioned with its flange portion 242 in contact with the upper surface of the cabin floor member 30. The longitudinal member 24 is positioned higher than the lower cross member 14 in the height direction of the vehicle 1. The longitudinal member 24 is directly or indirectly joined to the upper cross member 12 and the lower cross member 14 at a position where they overlap. From the viewpoint of suppressing deformation of the vehicle body understructure, the longitudinal member 24 is joined to the upper cross member 12 and the lower cross member 14, respectively, so that the entire vehicle body understructure member functions as a strong vehicle body understructure member. Note that the longitudinal member 24 is an example of a longitudinal structure member according to the present invention.

[0025] Furthermore, in the longitudinal member 24, the outer flange width dimension (A dimension) of the flange portion 242 is 90 mm or more and 110 mm or less, and in this example it is 100 mm. Also, the width dimension (B dimension) of the longitudinal member body 240 is 50 mm or more and 80 mm or less. Also, the thickness dimension (C dimension) of the longitudinal member 24 is 40 mm or more and 50 mm or less. Also, the plate thickness dimension (T dimension) of the flange portion 242 is 1.4 mm or more and 2.0 mm or less.

[0026] The cabin floor member 30 is, for example, a thin metal plate with a thickness of about 1 mm. The cabin floor member 30 is a component that constitutes the floor of the passenger compartment of the vehicle 1, and is not a structural component of the vehicle body. The cabin floor member 30 is positioned between the upper cross member 12 and the longitudinal member 24 and the lower cross member 14. The cabin floor member 30 is directly or indirectly joined to the upper cross member 12, the lower cross member 14, the side sill 22, and the longitudinal member 24. Note that the cabin floor member 30 is an example of a cabin floor member according to the present invention. By joining the cabin floor member 30 to the upper cross member 12, the lower cross member 14, the side sill 22, and the longitudinal member 24, these components are integrated.

[0027] The battery unit 40 is a power supply device in which at least a portion of the outer wall (battery unit structural member 42) is composed of structural members, as illustrated in Figure 2. The battery unit 40 is located below the cabin floor member 30 in the height direction of the vehicle 1 and is positioned on the bottom surface of the cabin floor member 30. Both ends of the battery unit 40 in the vehicle width direction W are joined to two side sills 22A and 22B. The battery unit 40 includes a drive battery (not shown) that supplies power to a drive motor which is the power source of the vehicle 1, and a battery unit structural member 42 that houses this drive battery. The battery unit structural member 42 has all or part of its outer wall having the same mechanical properties as the lower cross member 14C. Therefore, the battery unit structural member 42 of the battery unit 40 can function as a structural member of the vehicle body and may be connected to the side sill 22 instead of the lower cross member 14C. Alternatively, the battery unit structural member 42 of the battery unit 40 may be connected to the side sill 22 as a structural member together with the lower cross member 14C. Furthermore, if vehicle 1 is an engine-powered vehicle that does not require a battery unit 40, the battery unit 40 can be omitted. Note that the battery unit 40 is an example of a battery unit according to the present invention.

[0028] As illustrated in Figures 1 and 3, the guide rail 50 is a rail that slidably connects the upper cross member 12 and the seat legs 64 of the seat 60, which will be described later. The guide rail 50 includes a guide rail 50A located on the right side of the vehicle body and a guide rail 50B located on the left side of the vehicle body. Guide rails 50A and 50B have substantially the same configuration, and unless there is a need to distinguish between them, they are simply referred to as guide rail 50. The guide rail 50 is installed in an inclined direction M that is inclined with respect to both the longitudinal direction L and the vehicle width direction W of the vehicle 1. The guide rail 50 is positioned in the inclined direction M between the side sill 22 and the longitudinal member 24 that extend in the longitudinal direction L of the vehicle 1. Therefore, the guide rail 50 allows the seat 60 to slide in the inclined direction M. The inclined direction M of the guide rail 50 is the same direction as the direction in which the upper cross member 12 extends (length direction). The guide rail 50 allows the seat 60 to slide linearly along the upper cross member 12 in the longitudinal direction (i.e., the inclination direction M) of the upper cross member 12. The width dimension of the guide rail 50 is, for example, 50 mm or more and 70 mm or less. Note that the guide rail 50 is an example of a guide rail according to the present invention.

[0029] The guide rail 50A is a guide rail for moving the seat 60A (for example, the driver's seat) on the right side of the vehicle body. The guide rail 50A is provided on the upper cross member 12A. The guide rail 50A comprises a front guide rail 50A1 and a rear guide rail 50A2. The front guide rail 50A1 and the rear guide rail 50A2 have substantially the same configuration, and unless there is a need to distinguish between them, they are simply referred to as guide rail 50A. The guide rail 50A is slidably connected to the seat 60A in the inclined direction M1. The front guide rail 50A1 and the rear guide rail 50A2 are arranged parallel to each other.

[0030] The front guide rail 50A1 is positioned on the front cross member 12A1. The front guide rail 50A1 includes a rail and a slider that slides along the rail. The slider of the front guide rail 50A1 is connected to the front side of the seat leg 64 of the seat 60A. Furthermore, the rear guide rail 50A2 is positioned on the rear cross member 12A2. The rear guide rail 50A2 includes a rail and a slider that slides along the rail. The slider of the rear guide rail 50A2 is connected to the rear side of the seat leg 64 of the seat 60A.

[0031] Guide rail 50B is a guide rail for moving the seat 60B (e.g., passenger seat) on the left side of the vehicle body. Guide rail 50B is provided on the upper cross member 12B. Guide rail 50B is provided so as to be symmetrical with respect to guide rail 50A. Specifically, guide rail 50B is provided symmetrically with respect to guide rail 50A, using the longitudinal member 24 as the reference point for symmetry. Guide rail 50B comprises a front guide rail 50B1 and a rear guide rail 50B2. Note that the front guide rail 50B1 and the rear guide rail 50B2 have substantially the same configuration, and unless there is a need to distinguish between them, they are simply referred to as guide rail 50B. Guide rail 50B is connected to the seat 60B so as to be slidable in the inclined direction M2. The front guide rail 50B1 and the rear guide rail 50B2 are arranged parallel to each other.

[0032] The front guide rail 50B1 is located on the front cross member 12B1. The front guide rail 50B1 includes a rail and a slider that slides along the rail. The slider of the front guide rail 50B1 is connected to the front side of the seat leg 64 of the seat 60B. The rear guide rail 50B2 is located on the rear cross member 12B2. The rear guide rail 50B2 includes a rail and a slider that slides along the rail. The slider of the rear guide rail 50B2 is connected to the rear side of the seat leg 64 of the seat 60B.

[0033] The seat 60 is a device for the crew to sit on. As illustrated in Figure 1, the seat 60 is located on the front side L in the longitudinal direction of the vehicle 1 and is slidably connected to the upper cross member 12. The seat 60 includes seat 60A and seat 60B. Since seats 60A and 60B have substantially the same configuration, they are simply referred to as seat 60 unless there is a need to distinguish between them.

[0034] Seat 60A is positioned to slide freely along the upper cross member 12A, which is located in the inclination direction M1. Seat 60A is connected to the front guide rail 50A1 and the rear guide rail 50A2. Seat 60B is also positioned to slide freely along the upper cross member 12A, which is located in the inclination direction M2. Seat 60B is connected to the front guide rail 50B1 and the rear guide rail 50B2.

[0035] Furthermore, the seat 60 includes a seat back 61, a seat cushion 62, a seat leg 64, and a side airbag unit 65, as illustrated in Figure 3.

[0036] The seat back 61 is the backrest member of the seat 60. The seat back 61 is rotatably connected to the seat cushion 62, which will be described later. The seat back 61 is also equipped with a side airbag unit 65, which will be described later, on its side facing the passenger compartment (door D side) in the vehicle width direction W. The seat cushion 62 is a member that includes the seat surface of the seat 60. The seat cushion 62 is equipped with a seat leg 64, which will be described later, on its underside.

[0037] A seat leg 64 is a unit including a seat rail, etc., that moves and adjusts the position of a seat 60 in the longitudinal direction L of the vehicle 1. Multiple seat legs 64 are arranged parallel to each other with space between them. In this example, a pair of left and right seat legs 64 are arranged for one seat 60. Each seat leg 64 is connected to two parallel guide rails 50. The seat legs 64 are slidably connected via the guide rails 50 to a plurality of parallel upper cross members 12. The seat leg 64 includes seat legs 64A and seat legs 64B. Seat legs 64A and seat legs 64B have substantially the same configuration and are simply referred to as seat legs 64 unless there is a need to distinguish between them.

[0038] The side airbag unit 65 is a bag unit that deploys a side airbag 65A from the side of the seat 60. The side airbag unit 65 is installed on the outside in the vehicle width direction W within the seat frame of the seat back 61. The side airbag unit 65 protects occupants in the passenger compartment of vehicle 1 during a side collision by deploying the side airbag 65A. The side airbag unit 65 inflates and deploys the side airbag 65A by piercing the surface and urethane material of the seat back 61.

[0039] Figure 4 is a partially cutaway plan view showing the upper side of the lower cross member 14B and the longitudinal member 24 joined together according to the same embodiment. Figure 5 is a partially cutaway perspective view showing the joined lower cross member 14B and the longitudinal member 24 unfolded according to the same embodiment. As illustrated in Figures 4 and 5, the lower cross member 14B is joined to the longitudinal member 24 with the cabin floor member 30 in between. Specifically, the lower cross member 14B is positioned with its upper end surface, including the upper and lower flange portions 144B, in contact with the cabin floor member 30. The longitudinal member 24 is also positioned with its lower end surface, including the left and right flange portions 242, in contact with the cabin floor member 30. The flange portions 144B of the lower cross member 14B and the flange portions 242 of the longitudinal member 24 are joined mechanically or metallurgically. In the case of mechanical joining of the lower cross member 14B and the longitudinal member 24, for example, a bolt and nut joint is used. Furthermore, if the joining method for the lower cross member 14B and the longitudinal member 24 is a metallurgical joining method, it may be a joining method belonging to fusion welding such as arc welding, or pressure welding such as spot welding. In this example, the joining method is a bolt and nut joining as shown in Figure 5, but other joining methods may also be used.

[0040] Figure 6 is a schematic diagram showing a truss structure in a vehicle according to the same embodiment. As illustrated in Figure 6, the lower cross member 14A, the front cross member 12A1, and the side sill 22A are arranged to form a triangular truss structure T1 on the front right side of the vehicle 1 in the longitudinal direction L. The lower cross member 14A, the front cross member 12B1, and the side sill 22B are arranged to form a triangular truss structure T2 on the front left side of the vehicle 1 in the longitudinal direction L. The lower cross member 14B, the rear cross member 12A2, and the longitudinal member 24 are arranged to form a triangular truss structure T3 on the center right side of the vehicle 1 in the longitudinal direction L. The lower cross member 14B, the rear cross member 12B2, and the longitudinal member 24 are arranged to form a triangular truss structure T4 on the center left side of the vehicle 1 in the longitudinal direction L.

[0041] Therefore, the lower cross member 14, the side sill 22, and the upper cross member 12 are arranged in combination, or the lower cross member 14, the longitudinal member 24, and the upper cross member 12 are arranged in combination to form a truss structure. In this way, by forming a truss structure with the upper cross member 12 positioned on the upper surface of the cabin floor member 30, the lower cross member 14 positioned on the lower surface of the cabin floor member 30, and the side sill 22 or the longitudinal member 24, deformation of the underbody structure of the vehicle 1 can be suppressed, and the collision safety performance of the vehicle 1 can be improved.

[0042] Figure 7 is a schematic diagram showing the connection position between the seat leg 64 and the guide rail 50 according to the same embodiment. As illustrated in Figure 7, focusing on the seat 60A, two parallel guide rails 50 (front guide rail 50A1, rear guide rail 50A2) slidably connect two parallel upper cross members 12 (front cross member 12A1, rear cross member 12A2) and two parallel seat legs 64A and 64B. The seat leg 64, which is slidably mounted in the longitudinal direction L of the vehicle 1, is connected to the guide rail 50 which extends in an inclined direction M1 that is inclined with respect to the longitudinal direction L and the vehicle width direction W of the vehicle 1. In detail, at the connection position 100A where the seat leg 64A and the front guide rail 50A1 overlap, the front portion of the seat leg 64A is connected to the front guide rail 50A1. At connection point 100B where the seat leg 64A and the rear guide rail 50A2 overlap, the rear portion of the seat leg 64A is connected to the rear guide rail 50A2. Similarly, at connection point 100C where the seat leg 64B and the front guide rail 50A1 overlap, the front portion of the seat leg 64B is connected to the front guide rail 50A1. At connection point 100D where it overlaps with the rear guide rail 50A2, the rear portion of the seat leg 64B is connected to the rear guide rail 50A2. Thus, the seat 60A can slide in the inclined direction M1 toward the center of the vehicle width direction W of the vehicle 1. Although this explanation has focused on seat 60A, the same configuration applies to seat 60B, which is symmetrical to seat 60A using the longitudinal member 24 as the reference of symmetry.

[0043] <Seat movement> Figure 8 is a schematic diagram showing the movement of the seat 60 according to the same embodiment. As illustrated in Figure 8, the vehicle 1 receives a side collision impact I on the side sill 22A. After receiving the impact I, the seat 60A moves along the upper cross member 12A on the guide rail 50A in an inclined direction M1 toward the center in the vehicle width direction W. Specifically, the seat 60A slides forward in the inclined direction M1 from the position of the seat 60A0 before receiving the impact I to the position of the seat 60A1 after receiving the impact I.

[0044] On the other hand, after receiving an impact I, seat 60B moves along the upper cross member 12B on the guide rail 50B in an inclined direction M2 toward the periphery in the vehicle width direction W. Specifically, seat 60B slides backward in the inclined direction M2 from the position of seat 60B0 before receiving the impact I to the position of seat 60B1 after receiving the impact I. In this way, vehicle 1 can move seat 60A, which is located on the side that received the impact I, to the center of the vehicle interior. Furthermore, seat 60B can be moved backward in parallel with seat 60A, which has been moved to the center of the vehicle interior, so as not to obstruct its path.

[0045] As described above, according to the vehicle 1 of this embodiment, a truss structure can be formed in the underbody structure by combining an upper cross member 12 extending in an inclined direction M with respect to the vehicle's longitudinal direction L and vehicle width direction W, a lower cross member 14 extending in the vehicle width direction W, and a side sill 22 or longitudinal member 24 extending in the vehicle's longitudinal direction L. This suppresses vehicle body deformation. Furthermore, the guide rail 50 arranged on the upper cross member 12 allows the seat 60 to slide diagonally forward or backward with respect to the vehicle's longitudinal direction. This allows the seat 60 to be moved to the center in the vehicle width direction. As a result, the collision safety performance for passengers is further improved.

[0046] Furthermore, according to the vehicle 1 of this embodiment, when the vehicle 1 is an electric vehicle or hybrid vehicle equipped with a battery unit 40, the housing of the battery unit 40 can be used as part of the lower cross member 14, thereby combining the function of the battery unit 40 with the function of the lower cross member 14. This makes it possible to omit some of the multiple lower cross members 14. As a result, the weight of the vehicle body's understructure can be reduced.

[0047] Embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these embodiments. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. [Explanation of symbols]

[0048] 1 vehicle 10 Crossmembers 12 Upper cross member 12A1, 12B1 Front Crossmember 12A2, 12B2 Rear Crossmember 14, 14A, 14B, 14C Lower cross members 142B Lower cross member body 144B Flange section 22 Side sill 24 Vertical members 240 Vertical member body 242 Flange section 30 Cabin floor components 40 Battery Units 42 Battery unit structural components 50 Guide Rails 50A1, 50B1 Front Guide Rail 50A2, 50B2 Rear Guide Rail 60 seats 64 seat legs 100 connection position

Claims

1. Multiple longitudinal structural members are arranged at intervals from each other and extend in the front-to-rear direction of the vehicle, Multiple upper cross members are arranged parallel to each other and connected to the vertical structural member, At least one lower cross member is positioned lower than the upper cross member and is connected to the vertical structural member, Equipped with, The lower cross member, the vertical structural member, and the upper cross member are arranged to form a truss structure. vehicle.

2. A cabin floor member disposed between the upper cross member and the lower cross member, A seat leg positioned on a plurality of the aforementioned upper cross members, A guide rail that slidably connects the upper cross member and the seat leg, Furthermore, The vehicle according to claim 1.

3. A battery unit located beneath the cabin floor member, with at least a portion of its outer wall made of structural material. Furthermore, A portion of the outer wall of the battery unit is connected to the vertical structural member as the lower cross member. The vehicle according to claim 2.

4. The longitudinal structural member includes side sills extending in the longitudinal direction of the vehicle on both sides in the vehicle width direction, and a longitudinal member extending in the longitudinal direction of the vehicle in the central part in the vehicle width direction. The aforementioned longitudinal member is a structural member having a flange portion on its lower end surface. The lower cross member is a structural member having a flange portion on its upper end surface. The flange portion of the longitudinal member is connected to the flange portion of the lower cross member. The vehicle according to claim 3.

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