Lower vehicle body structure of vehicle

Abstract

The invention relates to a lower vehicle body structure of a vehicle. The lower vehicle body structure can prevent collision load from being transmitted to a battery during lateral collision. In the present invention, a side member (2) having a closed cross-sectional structure extending in the front-rear direction of a vehicle has an outer wall section (13), an inner wall section (23), upper wall sections (11, 21), lower wall sections (12, 22), an outer reinforcement (30) fixed to the outer wall section (13), and an inner reinforcement (40) fixed to the inner upper wall section (21) and the inner wall section (23). A cross beam (60) extending in the vehicle width direction is fixed to the inner upper wall portion (21), a battery (B) is supported by the inner lower wall portion (22), the outer reinforcement (30) has an overlapping portion (connecting surface portion (33)) overlapping the position of the inner reinforcement (40) in the vertical direction, and the inner reinforcement (40) is separated from the inner lower wall portion (22) in the vertical direction.

Description

Technical Field

[0001] The technology disclosed herein belongs to the technical field related to the lower body structure of a vehicle. Background Art

[0002] In hybrid vehicles and electric vehicles, batteries are generally arranged on the lower side of the floor. In the above-mentioned vehicles, research has been conducted on a body structure for absorbing collision energy so that the collision load during a side collision does not transfer to the battery.

[0003] Patent Document 1 discloses a side sill member that includes: a first profile member located relatively on the outer side in the vehicle width direction and having a first extrudability, and a second profile member located relatively on the inner side in the vehicle width direction and having a second extrudability lower than the first extrudability. In Patent Document 1, during a side collision, the first profile member and the second profile member are extruded, thereby absorbing the collision energy.

[0004]

Prior Art Documents

Patent Documents

Patent Document 1

[0005]

Technical Problem to be Solved by the Invention

[0006] In view of the above points, the technology disclosed herein aims to suppress the transmission of the collision load during a side collision to the battery.

[0007]

Technical Means for Solving the Technical Problem

[0008] In the first aspect, when the outer wall portion is displaced inward in the vehicle width direction due to a side collision, the overlapping portion of the outer reinforcing member will abut against the inner reinforcing member. The inner reinforcing member is fixed to the upper wall portion and the inner wall portion of the side beam, so the load transmitted from the outer reinforcing member to the inner reinforcing member will be transmitted inward and upward in the vehicle width direction. Since the cross beam is fixed to the upper wall portion, the collision load will be transmitted from the inner reinforcing member to the cross beam. On the other hand, the inner reinforcing member is separated from the lower wall portion supporting the battery in the vertical direction, so it is difficult for the collision load to be transmitted from the inner reinforcing member to the battery. Through the above, it is possible to suppress the transmission of the collision load to the battery during a side collision.

[0009] A second aspect is that in the first aspect, the center of the inner reinforcing member in the vertical direction is located at a position above the center of the overlapping portion in the vertical direction.

[0010] In the second aspect, when the overlapping portion of the outer reinforcing member abuts against the inner reinforcing member, even if the inner reinforcing member rotates and displaces due to the collision load, the inner reinforcing member will rotate and displace inward and upward in the vehicle width direction. Therefore, it is easy to maintain the transmission path of the collision load from the outer reinforcing member to the cross beam. Thus, it is possible to suppress the transmission of the collision load to the battery during a side collision.

[0011] A third aspect is that in the first aspect, the fixing portion of the inner reinforcing member to the inner wall portion is located at a position above the center of the inner wall portion in the vertical direction.

[0012] In the third form, the collision load is liable to be transmitted from the inner reinforcing member to the upper portion of the inner side wall portion. Thereby, the collision load is liable to be transmitted from the inner reinforcing member to the cross member, and thus the collision load during a side collision can be inhibited from being transmitted to the battery.

[0013] The fourth form is the first form in which the overlapping portion has a surface extending in the vertical direction and the vehicle longitudinal direction, and coincides with the cross member in the vehicle longitudinal direction.

[0014] In the fourth form, the overlapping portion contacts the inner reinforcing member over as large a range as possible, and thus the collision load can be dispersed and input to the inner reinforcing member. Moreover, since the overlapping portion coincides with the cross member in the vehicle longitudinal direction, the transmission path of the collision load can be made as short as possible. Thereby, the collision load is efficiently transmitted from the outer reinforcing member to the cross member, and thus the collision load during a side collision can be inhibited from being transmitted to the battery.

[0015] The fifth form is one of the first to fourth forms in which the inner reinforcing member has a longitudinal surface fixed to the upper wall portion and the inner side wall portion and extending in the vertical direction and the vehicle width direction.

[0016] In the fifth form, the collision load is efficiently transmitted from the outer reinforcing member to the cross member via the longitudinal surface. Thereby, the collision load during a side collision can be inhibited from being transmitted to the battery.

[0017] The sixth form is the fifth form in which the longitudinal surface coincides with the cross member in the vehicle longitudinal direction.

[0018] In the sixth form, the transmission path of the collision load is as short as possible, and thus the collision load is efficiently transmitted from the outer reinforcing member to the cross member. Thereby, the collision load during a side collision can be inhibited from being transmitted to the battery.

[0019] The seventh form is the fifth form in which the inner reinforcing member has a horizontal surface that coincides with the installation area of the battery in the vehicle longitudinal direction and extends in the vehicle longitudinal direction and the vehicle width direction, and is fixed to the inner side wall portion. The horizontal surface is located below the longitudinal surface and is separated from the lower wall portion in the vertical direction.

[0020] In the seventh form, when the overlapping portion of the outer reinforcing member abuts against the inner reinforcing member, even if the longitudinal surface rotates and displaces due to the collision load, the downward displacement of the longitudinal surface can be inhibited by the horizontal surface. Thereby, the direct transmission of the collision load to the support portion of the battery can be inhibited.

[0021] The eighth form is the fifth form in which the longitudinal surface has a reinforcing rib that slopes upward from the outer side in the vehicle width direction toward the inner side in the vehicle width direction.

[0022] In the eighth form, through the reinforcing rib, the collision load is efficiently transmitted inward and upward in the vehicle width direction. Thus, the collision load is transmitted to the cross beam, so that the collision load during a side collision can be inhibited from being transmitted to the battery.

[0023] The ninth form is that in the fifth form, the fixing part of the longitudinal surface portion and the upper wall portion further overlap and the cross beam is fixed thereto.

[0024] In the ninth form, the rigidity of the fixing part of the longitudinal surface portion and the upper wall portion becomes higher. Thus, the collision load is efficiently transmitted from the outer reinforcing member to the cross beam via the longitudinal surface portion. Thus, the collision load during a side collision can be inhibited from being transmitted to the battery.

[0025] The tenth form is that in the seventh form, the longitudinal surface portion is fixed to the horizontal surface portion.

[0026] In the tenth form, even if the side collision position is at a position other than the position of the longitudinal surface portion, the collision load is transmitted to the longitudinal surface portion via the horizontal surface portion. Thus, the collision load is efficiently transmitted from the outer reinforcing member to the cross beam via the horizontal surface portion and the longitudinal surface portion. Thus, the collision load during a side collision can be inhibited from being transmitted to the battery.

[0027] The eleventh form is that in the seventh form, the inner reinforcing member has an inner bent portion that bends upward from the end portion on the inner side in the vehicle width direction of the horizontal surface portion, and the fixing part of the longitudinal surface portion and the inner side wall portion further overlap and the inner bent portion is fixed thereto.

[0028] In the eleventh form, the rigidity of the fixing part of the longitudinal surface portion and the inner side wall portion becomes higher. Thus, the collision load is efficiently transmitted from the outer reinforcing member to the cross beam via the longitudinal surface portion. Thus, the collision load during a side collision can be inhibited from being transmitted to the battery.

[0029]

Invention Effect

[0030] Figure 1 is a top view of the body of a vehicle having a lower body structure according to an exemplary embodiment; Figure 2 is equivalent to Figure 1 a sectional view taken along the plane of line II-II; Figure 3 is equivalent to Figure 2 a sectional view taken along the plane of line III-III; Figure 4 is equivalent to Figure 3 a sectional view taken along the plane of line IV-IV; Figure 5 Is a perspective view of the first inner reinforcement member; Figure 6 Is a perspective view of the second inner reinforcement member; Figure 7 Is a perspective view of the joint portion of the second inner reinforcement member and the inner panel; Figure 8 Is a perspective view of the joint portion of the first inner reinforcement member and the second inner reinforcement member; Figure 9 Is a sectional view taken along a plane corresponding to line IX-IX of Figure 3 ; Figure 10 Is a sectional view of the state where the collision body abuts against the side beam during a side collision; Figure 11 Is from Figure 10 In the state, a sectional view of the state where the collision body intrudes into the cockpit side; Figure 12 Is from Figure 11 In the state, a sectional view of the state where the collision body further intrudes into the cockpit side and the second inner reinforcement member is squeezed. Detailed implementation manners

[0031] The exemplary embodiments will be described in detail below with reference to the accompanying drawings. In the following description, the front, rear, left, right, top, and bottom of the vehicle 1 are simply referred to as front, rear, left, right, top, and bottom, respectively. The left-right direction corresponds to the vehicle width direction.

[0032] (Overall structure of the lower body) Figure 1 Is the lower body of the vehicle 1 to which the body structure according to the present embodiment is applied. The vehicle 1 is a 4-door passenger car. In the present embodiment, the body structure of the vehicle 1 is bilaterally symmetric.

[0033] The vehicle 1 includes a pair of left and right side beams 2. Each side beam 2 extends straight in the front-rear direction. Each side beam 2 has a closed cross-section structure that extends straight in the front-rear direction, which will be described in detail later.

[0034] The vehicle 1 includes a floor 3 that forms the cockpit floor. The floors 3 are provided in a pair on the left and right. Each floor 3 has a floor main body 3a (refer to Figure 2 etc.) that extends in the vehicle width direction and the front-rear direction, and a floor joint portion 3b (refer to Figure 2 etc.) that is fixed to the side beam 2 by welding. The floor joint portion 3b of the left floor 3 is provided at the left end and is fixed to the right portion of the left side beam 2 by welding. The floor joint portion 3b of the right floor 3 is provided at the right end and is fixed to the left portion of the right side beam 2 by welding. The right end of the left floor 3 and the left end of the right floor 3 are connected by a channel plate 4.

[0035] An upwardly curved portion 5 is configured at the rear end of the floor 3. The rear floor 6 extends rearward from the upwardly curved portion 5. The rear floor 6 mainly constitutes the floor of the luggage compartment. Left and right paired rear wheel housings 7 are arranged on both left and right sides of the rear floor 6.

[0036] Two cross beams 60 extending in the left - right direction are arranged above the floor 3. The two cross beams 60 are arranged in the front - rear direction. The front - rear position of the rear cross beam 60 is the same as the front - rear position of the center pillar 9 (refer to Figure 2 etc.).

[0037] The cross beam 60 has a cross beam main body 61 and brackets 62. The brackets 62 are respectively fixed to both left - right sides of the cross beam main body 61. The brackets 62 are fixed to the cross beam main body 61. The left bracket 62 is fixed to the left side beam 2 by welding, and the right bracket 62 is fixed to the right side beam 2 by welding. Thus, the left - right ends of the cross beam 60 are fixed to the side beam 2. The lower end of the cross beam main body 61 is fixed to the upper side surface of the floor 3 and the upper side surface of the tunnel plate 4.

[0038] Left and right paired floor frames 8 are arranged at a position in front of the front cross beam 60. The floor frames 8 extend in the front - rear direction.

[0039] As Figure 2 shown, a battery B is arranged below the floor 3. The battery B is arranged below the floor 3 in a state of being housed in a battery box 70.

[0040] The battery B is supported by the lower wall portion (inner lower wall portion 22 described later) of the side beam 2 via a support portion 80 together with the battery box 70. Specifically, a bracket 71 extending outward in the vehicle width direction is fixed to a portion outside the vehicle width direction of the battery box 70 ( Figure 2 the right - hand portion in this case). A hole 71a for inserting a bolt 81 is formed at the end portion outside the vehicle width direction of the bracket 71 ( Figure 2 the right - hand end portion in this case). The bolt 81 is engaged with a nut 82 fixed to a portion within the closed cross - section of the lower wall portion of the side beam 2. The bolt 81 is inserted into the hole 71a of the bracket 71 from below and fixed to the nut 82. Thus, the battery B is supported by the side beam 2 via the battery box 70 and the bracket 71. The bolt 81 and the nut 82 constitute the support portion 80. A bushing 72 is arranged around the bolt 81 between the bracket 71 and the inner lower wall portion 22. The bushing 72 is composed of an elastic member. The center portion in the vehicle width direction of each battery box 70 is mounted on the tunnel plate 4 and supported, and the illustration is omitted.

[0041] (Structure of the side beam) The structure of the side beam 2 will be described in detail below. As described above, the body structure of the vehicle 1 is symmetrical about the left and right. Therefore, the structure of the right side beam 2 will be described in detail below, and the detailed description of the left side beam 2 will be omitted. In the description of the right side beam 2, the right side corresponds to the outer side in the vehicle width direction, and the left side corresponds to the inner side in the vehicle width direction.

[0042] 〈Outer panel, inner panel〉 As Figure 2 shown, the side beam 2 has an outer panel 10 located relatively on the right side and an inner panel 20 located relatively on the left side.

[0043] The outer panel 10 has a hat-shaped cross-sectional shape that opens to the left. The outer panel 10 has: an outer upper wall portion 11 that extends in the left-right direction and the front-rear direction, an outer lower wall portion 12 that is disposed opposite to the outer upper wall portion 11 in the up-down direction below the outer upper wall portion 11 and extends in the left-right direction and the front-rear direction, and an outer side wall portion 13 that connects the right end portion of the outer upper wall portion 11 and the right end portion of the outer lower wall portion 12 in the up-down direction and extends in the up-down direction and the front-rear direction. Outer flanges 14 extend in the up-down direction from the left end portion of the outer upper wall portion 11 and the left end portion of the outer lower wall portion 12. The outer upper wall portion 11 slopes downward toward the right side. The outer lower wall portion 12 slopes upward toward the right side.

[0044] At the position of the center pillar 9 in the front-rear direction, the lower end portion of the center pillar 9 is located on the right side of the outer panel 10. The lower end portion of the center pillar 9 is fixed to the outer panel 10 by welding.

[0045] The inner panel 20 has a hat-shaped cross-sectional shape that opens to the right. It has: an inner upper wall portion 21 that extends in the left-right direction and the front-rear direction, an inner lower wall portion 22 that is disposed opposite to the inner upper wall portion 21 in the up-down direction below the inner upper wall portion 21 and extends in the left-right direction and the front-rear direction, and an inner side wall portion 23 that connects the left end portion of the inner upper wall portion 21 and the left end portion of the inner lower wall portion 22 in the up-down direction and extends in the up-down direction and the front-rear direction. Inner flanges 24 extend in the up-down direction from the right end portion of the inner upper wall portion 21 and the right end portion of the inner lower wall portion 22. The inner upper wall portion 21 slopes downward toward the left side. The inner lower wall portion 22 extends straight in the left-right direction. The inner lower wall portion 22 has a hole 22a for inserting a bolt 81.

[0046] With the outer panel 10 and the inner panel 20 in a state where their openings face each other in the left-right direction, the outer flanges 14 and the inner flanges 24 overlap in the left-right direction. The outer flanges 14 and the inner flanges 24 are joined by welding. Thus, the side beam 2 is composed of an outer upper wall portion 11, an outer lower wall portion 12, an outer side wall portion 13, an inner upper wall portion 21, an inner lower wall portion 22, and an inner side wall portion 23, and has a rectangular closed cross-sectional structure.

[0047] The floor 3 and the cross beam 60 are fixed to the inner panel 20. Specifically, as Figure 2As shown, the floor joint 3b of the floor 3 is formed by bending the right end of the floor main body 3a upward, extending along the inner side wall portion 23 and joining the left side surface of the inner side wall portion 23. The bracket 62 of the cross beam 60 is arranged to cover the corner of the inner upper wall portion 21 and the inner side wall portion 23. The bracket 62 has a welding margin 63 that continuously extends along the inner upper wall portion 21 and the inner side wall portion 23. The portion of the welding margin 63 along the inner upper wall portion 21 joins the inner upper wall portion 21. The portion of the welding margin 63 along the inner side wall portion 23 overlaps the right end of the floor 3 in the left-right direction and joins the inner side wall portion 23 via the floor 3. In Figure 2 Figure 2, the fixing structure of the rear cross beam 60 and the inner panel 20 is shown. The structure of the front cross beam 60 and the inner panel 20 is the same as the fixing structure of the rear cross beam 60 and the inner panel 20.

[0048] 〈Outer Reinforcement〉 As Figure 2 shown, inside the closed cross-section structure of the side beam 2, an outer reinforcement 30 is fixed to the outer panel 10. The outer reinforcement 30 is formed by bending a single plate. The material strength of the outer reinforcement 30 is lower than the material strength of the cross beam main body 61. The material strength referred to here means the strength of the plate that constitutes the member. The material strength is a parameter determined by, for example, the material and thickness of the plate.

[0049] The outer reinforcement 30 has a hat-shaped cross-sectional shape that opens to the right. The outer reinforcement 30 has: an upper side face portion 31 that extends in the left-right direction and the front-back direction, a lower side face portion 32 that is disposed opposite to the upper side face portion 31 below the upper side face portion 31 and extends in the left-right direction and the front-back direction, and a connecting face portion 33 that connects the left end portion of the upper side face portion 31 and the left end portion of the lower side face portion 32 in the up-down direction and extends in the up-down direction and the front-back direction. The outer reinforcement 30 also has: an upper flange 34 that extends upward along the outer side wall portion 13 from the right end portion of the upper side face portion 31 and is fixed to the outer side wall portion 13 by welding, and a lower flange 35 that extends downward along the outer side wall portion 13 from the right end portion of the lower side face portion 32 and is fixed to the outer side wall portion 13 by welding. The upper flange 34 and the lower flange 35 are fixed to the outer side wall portion 13, whereby the outer side wall portion 13, the upper side face portion 31, the lower side face portion 32, and the connecting face portion 33 form a rectangular closed cross-section.

[0050] The upper side face 31 slopes upward to the right from the upper end of the connecting face 33. The lower side face 32 slopes downward to the right from the lower end of the connecting face 33. The connecting face 33 is a vertical face that extends straight in the vertical and front-rear directions. The upper side face 31 is in the same position as the floor main body 3a in the vertical direction. The connecting face 33 is separated from the outer wall part 13 in the left-right direction and is located on the left side of other parts of the outer reinforcing member 30. The lower end of the connecting face 33 is located above the outer lower wall part 12 and the inner lower wall part 22. The lower end of the connecting face 33 is located above the top of the bolt 81 of the support part 80. The connecting face 33 corresponds to the overlapping part that overlaps with the inner reinforcing member 40 described later in the vertical direction.

[0051] As Figure 3 shown, the outer reinforcing member 30 extends straight in the front-rear direction. The closed cross-section of the outer reinforcing member 30 and the outer wall part 13 also extends straight in the front-rear direction. The front end of the outer reinforcing member 30 is located in front of the front cross beam 60, and the rear end of the outer reinforcing member 30 is located behind the rear cross beam 60. That is, the outer reinforcing member 30 and the cross beam 60 overlap in the front-rear direction. In particular, the position of the connecting face 33 of the outer reinforcing member 30 in the front-rear direction overlaps with the cross beam 60. The outer reinforcing member 30 also overlaps with the arrangement area of the battery B in the front-rear direction.

[0052] As Figure 4 shown, the corner between the lower side face 32 and the lower flange 35 has a deformation promoting part 36. The deformation promoting part 36 is used to make the lower side face 32 easily displace upward with the corner as the center. The deformation promoting part 36 is a reinforcing rib that protrudes to the left and downward at the corner. The bottom surface of the deformation promoting part 36 is in an inclined surface shape and connects the right end of the lower side face 32 and the upper end of the lower flange 35. The above-mentioned deformation promoting part is not provided at the corner between the upper side face 31 and the upper flange 34. The position of the deformation promoting part 36 in the front-rear direction coincides with the horizontal face 44 of the second inner reinforcing member 42 described later. The bottom surface of the deformation promoting part 36 can also be a curved surface, and its radius of curvature is greater than the radius of curvature of the part other than the deformation promoting part 36 at the corner. The deformation promoting part 36 can also be formed by cutting off a part of the corner between the lower side face 32 and the lower flange 35.

[0053] 〈Inner Reinforcing Member〉 Inside the closed cross-section of the side beam 2, the inner reinforcing member 40 is fixed to the inner plate 20. As Figure 3As shown, the positions of the inner reinforcement member 40 and the outer reinforcement member 30 coincide in the front-rear direction. That is, the connecting surface portion 33 of the outer reinforcement member 30 coincides with the inner reinforcement member 40 in the front-rear direction. The inner reinforcement member 40 is separated from the inner lower wall portion 22 in the up-down direction. The inner reinforcement member 40 is located above the tip of the bolt 81.

[0054] The inner reinforcement member 40 has a first inner reinforcement member 41 and a second inner reinforcement member 42.

[0055] As Figure 4 shown, the first inner reinforcement member 41 is composed of a single plate. The material strength of the first inner reinforcement member 41 is lower than that of the outer reinforcement member 30.

[0056] As Figure 4 and Figure 5 shown, the first inner reinforcement member 41 has a U-shaped cross-sectional shape that opens upward. The first inner reinforcement member 41 has: a horizontal surface portion 41a that extends in the left-right and front-rear directions, an inner bent portion 41b that bends upward from the left end portion of the horizontal surface portion 41a and extends in the up-down and front-rear directions, and an outer bent portion 41c that bends upward from the right end portion of the horizontal surface portion 41a and extends in the up-down and front-rear directions.

[0057] As Figure 4 shown, the horizontal surface portion 41a is located above the inner lower wall portion 22 and is separated from the inner lower wall portion 22 in the up-down direction. The horizontal surface portion 41a is located above the tip of the bolt 81. The horizontal surface portion 41a is located below the second inner reinforcement member 42. The horizontal surface portion 41a is located below the lower end of the connecting surface portion 33. The horizontal surface portion 41a coincides with the installation area of the battery B in the front-rear direction.

[0058] The length of the inner bent portion 41b in the up-down direction is longer than the length of the outer bent portion 41c in the up-down direction. The inner bent portion 41b coincides with the connecting surface portion 33 in the up-down direction. The inner bent portion 41b is fixed to the right side surface of the inner side wall portion 23 by welding. Thus, the horizontal surface portion 41a is fixed to the inner side wall portion 23. The fixing portion of the inner bent portion 41b and the inner side wall portion 23 is located above the center of the inner side wall portion in the up-down direction.

[0059] As Figure 5 shown, the outer bent portion 41c has a plurality of ( Figure 5 in this case, 5) protruding portions 41d that protrude upward. The protruding portions 41d are separated from each other in the front-rear direction. The upper end portions of the protruding portions 41d are located below the upper end portion of the inner bent portion 41b. As Figure 4 shown, the protruding portions 41d coincide with the connecting surface portion 33 in the up-down direction. As Figure 2As shown, the portion of the outer bent portion 41c other than the protruding portion 41d is located below the connecting surface portion 33.

[0060] As Figure 3 shown, a plurality (five in this case) of second inner reinforcing members 42 are provided. The second inner reinforcing members 42 are arranged separately in the front-rear direction. The protruding portions 41d of the first inner reinforcing member 41 are arranged corresponding to the positions of the second inner reinforcing members 42. One of the second inner reinforcing members 42 coincides with the front cross beam 60 in the front-rear direction. Another one of the second inner reinforcing members 42 coincides with the rear cross beam 60 in the front-rear direction. The second inner reinforcing members 42 coincide with the connecting surface portion 33 in the front-rear direction.

[0061] As Figure 6 shown, the second inner reinforcing member 42 is composed of a single plate. The material strength of the second inner reinforcing member 42 is the same as that of the first inner reinforcing member 41 and lower than the material strength of the outer reinforcing member 30.

[0062] The second inner reinforcing member 42 has: a pair of longitudinal surface portions 43 that face each other in the front-rear direction and extend in the up-down direction and the left-right direction, and a transverse surface portion 44 that extends in the front-rear direction and the up-down direction and connects the right end portions of the pair of longitudinal surface portions 43. The transverse surface portion 44 is provided at the center of the right end portions of the longitudinal surface portions 43. At the right end portions of the longitudinal surface portions 43, the transverse surface portion 44 is not connected to the upper end portion and the lower end portion. The distance in the front-rear direction between the pair of longitudinal surface portions 43 is smaller than the width in the front-rear direction of the cross beam 60. In the second inner reinforcing member 42 that coincides with the cross beam 60 in the front-rear direction, both of the pair of longitudinal surface portions 43 coincide with the cross beam 60 in the vehicle front-rear direction.

[0063] As Figure 4 shown, the longitudinal surface portion 43 is rectangular. The longitudinal surface portion 43 coincides with the connecting surface portion 33 in the up-down direction. The center in the up-down direction of the longitudinal surface portion 43 is located above the center C1 in the up-down direction of the connecting surface portion 33. Compared with the center C2 in the up-down direction of the inner reinforcing member 40, the center in the up-down direction of the longitudinal surface portion 43 is slightly deviated by the amount of the thickness of the horizontal surface portion 41a, but can also be regarded as coinciding with the center C2 in the up-down direction of the inner reinforcing member 40.

[0064] The longitudinal surface portion 43 has a reinforcing rib 43a that extends obliquely upward from the right side toward the left side. As Figure 2 and Figure 4As shown, the lower end portion of the reinforcing rib 43a coincides with the connecting surface portion 33 of the outer reinforcing member 30 in the vertical direction. The upper end portion of the reinforcing rib 43a is located above the floor 3 and coincides with the cross beam 60 in the vertical direction. The rigidity of a part of the reinforcing rib 43a is higher than that of other parts of the longitudinal surface portion 43. The longitudinal surface portion 43 has through holes 43b on the upper right side and the lower left side of the reinforcing rib 43a.

[0065] As Figure 6 shown, the longitudinal surface portion 43 has a first upper side joint portion 45 and a second upper side joint portion 46 at the upper end portion. The first upper side joint portion 45 is located on the right side of the second upper side joint portion 46. The longitudinal surface portion 43 has a first inner side joint portion 47 and a second inner side joint portion 48 at the left end portion. The first inner side joint portion 47 is located above the second inner side joint portion 48. The longitudinal surface portion 43 has a lower side joint portion 49 at the lower end portion. The first upper side joint portion 45, the second upper side joint portion 46, the first inner side joint portion 47, the second inner side joint portion 48, and the lower side joint portion 49 extend forward in the front longitudinal surface portion 43 and extend backward in the rear longitudinal surface portion 43.

[0066] As Figure 7 and Figure 9 shown, the first upper side joint portion 45 and the second upper side joint portion 46 are joined to the lower side surface of the inner upper wall portion 21. As Figure 9 shown, the first upper side joint portion 45 and the second upper side joint portion 46 are located above the connecting surface portion 33. The fixed portion of the second upper side joint portion 46 and the inner upper wall portion 21 further overlap in the vertical direction and are joined with the welding margin 63 of the bracket 62. That is, at the position of the second upper side joint portion 46, the second upper side joint portion 46, the inner upper wall portion 21, and the welding margin 63 of the bracket 62 are joined together in three layers.

[0067] As Figure 7 and Figure 9 shown, the first inner side joint portion 47 is joined to the right side surface of the inner side wall portion 23. As Figure 9 shown, the fixed portion of the first inner side joint portion 47 and the inner side wall portion 23 further overlap in the left - right direction and are joined with the floor joint portion 3b. That is, at the position of the first inner side joint portion 47, the first inner side joint portion 47, the inner side wall portion 23, and the floor joint portion 3b are joined together in three layers. The first inner side joint portion 47 coincides with the upper end portion of the reinforcing rib 43a in the vertical direction.

[0068] As Figure 7 and Figure 9 shown, the second inner side joint portion 48 is joined to the right side surface of the inner side bent portion 41b. As Figure 9As shown, the fixed part of the second inner joint portion 48 and the inner bent portion 41b also overlaps in the left-right direction and the inner wall portion 23 is joined thereto. That is, at the position of the second inner joint portion 48, the second inner joint portion 48, the inner bent portion 41b, and the inner wall portion 23 are joined together in three layers. The second inner joint portion 48 and the connecting surface portion 33 are coincident in the up-down direction.

[0069] As Figure 8 and Figure 9 shown, the lower joint portion 49 is joined to the upper side surface of the horizontal surface portion 41a. Compared with the first upper joint portion 45, the second upper joint portion 46, the first inner joint portion 47, and the second inner joint portion 48, the joint width of the lower joint portion 49 is larger. As Figure 9 shown, the lower joint portion 49 is located at a position lower than the connecting surface portion 33.

[0070] As described above, the vertical surface portion 43 is joined and fixed to the horizontal surface portion 41a, the inner bent portion 41b, the inner upper wall portion 21, and the inner wall portion 23. The three edges of the upper end portion, the left end portion, and the lower end portion of the vertical surface portion 43 are fixed, so that the shape is easily maintained even when a load is input from the right side.

[0071] As Figure 6 shown, the horizontal surface portion 44 is located at a position lower than the first upper joint portion 45 and the second upper joint portion 46, and is located at a position higher than the lower joint portion 49. The horizontal surface portion 44 has a recessed portion 44a that is recessed downward in the center in the front-rear direction. As Figure 4 shown, the horizontal surface portion 44 and the connecting surface portion 33 are coincident in the up-down direction. The horizontal surface portion 44 and the connecting surface portion 33 are separated in the left-right direction. The horizontal surface portion 44 is located at a position to the right of the protruding portion 41d and overlaps the protruding portion 41d in the left-right direction. The horizontal surface portion 44 is fixed to the protruding portion 41d by welding.

[0072] (Action of side beam during side collision) Here, in the structure in which the battery B is disposed below the floor 3, it is necessary to prevent the collision load during side collision from being input to the battery B as much as possible. Therefore, in the present embodiment, as described above, the outer reinforcing member 30 and the inner reinforcing member 40 are disposed to transmit the collision load during side collision to the floor 3 and the cross beam 60. The following refers to Figures 10 to 12 , and the action of the side beam during side collision will be described. Figures 10 to 12 The figure shows a case where a collision body M collides with a position near the center column 9 from the right side.

[0073] As Figure 10As shown, it is assumed that the collision body M advances to the left and abuts against the side beam 2. At this time, the outer panel 10 deforms and the outer reinforcement 30 is displaced to the left. As a result, the connecting surface portion 33 of the outer reinforcement 30 abuts against the second inner reinforcement 42. The connecting surface portion 33 abuts against a portion of the second inner reinforcement 42 that is located below the first upper joint portion 45 and the second upper joint portion 46 and above the lower joint portion 49.

[0074] The connecting surface portion 33 and the second inner reinforcement 42 abut against each other, and thus the collision load is transmitted from the outer reinforcement 30 to the second inner reinforcement 42. The second inner reinforcement 42 is fixed to the inner upper wall portion 21 and the inner side wall portion 23. Therefore, the load transmitted from the outer reinforcement 30 to the second inner reinforcement 42 is transmitted to the left and upward. The floor 3 and the cross beam 60 are fixed to the left and upper portions of the side beam 2. Therefore, the collision load is transmitted from the second inner reinforcement 42 to the floor 3 and the cross beam 60. The second inner reinforcement 42 includes a longitudinal surface portion 43 having a reinforcing rib 43a. Therefore, the collision load is efficiently transmitted from the outer reinforcement 30 to the floor 3 and the cross beam 60 via the reinforcing rib 43a.

[0075] As Figure 11 shown, from Figure 10 this state, if the collision body M invades to the left, the outer reinforcement 30 deforms due to the repulsive load from the longitudinal surface portion 43. The lower side surface portion 32 of the outer reinforcement 30 has a deformation promoting portion 36 at the corner between the lower side surface portion 32 and the lower flange 35, and thus is more likely to be displaced than the upper side surface portion 31. Therefore, after the repulsive load is input, the lower side surface portion 32 rotates and displaces upward with the corner as a fulcrum. As the lower side surface portion 32 is displaced, the upper side surface portion 31 and the connecting surface portion 33 are displaced upward. As a result, the second inner reinforcement 42 is in a state of being pushed upward toward the left. Thereby, the collision load is efficiently transmitted from the outer reinforcement 30 to the floor 3 and the cross beam 60.

[0076] In addition, the inner reinforcement 40 rotates and displaces due to the collision load. The center of the inner reinforcement 40 in the up-down direction is located above the center C1 of the connecting surface portion 33 in the up-down direction. Therefore, the inner reinforcement 40 rotates and displaces upward toward the left. Therefore, even if the inner reinforcement 40 rotates and displaces, the collision load is efficiently transmitted from the outer reinforcement 30 to the floor 3 and the cross beam 60.

[0077] As Figure 12 shown, from Figure 11From the state where [description of the initial state], if the collision body M invades to the left, the second inner reinforcing member 42 is squeezed. The material strength of the second inner reinforcing member 42 is lower than that of the outer reinforcing member 30. Therefore, the second inner reinforcing member 42 will be squeezed before the outer reinforcing member 30. A part of the collision load is absorbed by squeezing the second inner reinforcing member 42. The connecting surface portion 33 abuts against a portion of the second inner reinforcing member 42 that is located below the first upper joint portion 45 and the second upper joint portion 46 and above the lower joint portion 49. Therefore, it is easy to maintain the shapes of the upper end portion, the left end portion, and the lower end portion. Thus, it is possible to simultaneously absorb the collision load by squeezing the second inner reinforcing member 42 and transmit the load via the second inner reinforcing member 42.

[0078] (Effect of the embodiment) As described above, in the present embodiment, the side beam 2 has: an outer wall portion 13, which is a wall surface located on the outer side in the vehicle width direction and extending in the vertical direction and the front-rear direction; an inner wall portion 23, which is a wall surface located on the inner side in the vehicle width direction and extending in the vertical direction and the front-rear direction; an outer upper wall portion 11, which extends in the vehicle width direction from the upper end portion of the outer wall portion 13; an inner upper wall portion 21, which extends in the vehicle width direction from the upper end portion of the inner wall portion 23; an outer lower wall portion 12, which extends in the vehicle width direction from the lower end portion of the outer wall portion 13; an inner lower wall portion 22, which extends in the vehicle width direction from the lower end portion of the inner wall portion 23; an outer reinforcing member 30, which is fixed to the outer wall portion 13 inside the closed cross-section structure; an inner reinforcing member 40, which is fixed to the inner upper wall portion 21 and the inner wall portion 23 inside the closed cross-section structure; wherein, a cross beam 60 is fixed to the inner upper wall portion 21, the battery B is supported by the inner lower wall portion 22, the outer reinforcing member 30 has a connecting surface portion 33 located on the inner side in the vehicle width direction compared to other parts of the outer reinforcing member 30 and coinciding with the inner reinforcing member 40 in the vertical direction, and the inner reinforcing member 40 is separated from the inner lower wall portion 22 in the vertical direction. If the connecting surface portion 33 of the outer reinforcing member 30 abuts against the inner reinforcing member 40, the collision load will be transmitted to the inner side and the upper side in the vehicle width direction via the inner reinforcing member 40. Since the cross beam 60 is fixed to the inner upper wall portion 21, the collision load will be transmitted from the inner reinforcing member 40 to the cross beam 60. On the other hand, the inner reinforcing member 40 is separated from the inner lower wall portion 22 that supports the battery B in the vertical direction. Therefore, it is difficult for the collision load to be transmitted from the inner reinforcing member 40 to the battery B. Through the above, it is possible to suppress the transmission of the collision load to the battery B during a side collision.

[0079] In the present embodiment, the vertical center C2 of the inner reinforcement 40 is located above the vertical center C1 of the connecting surface portion 33. Thus, when the connecting surface portion 33 abuts against the inner reinforcement 40, even if the inner reinforcement 40 rotates and displaces due to a collision load, the inner reinforcement 40 rotates and displaces inward and upward in the vehicle width direction. Therefore, it is easy to maintain the transfer path of the collision load from the inner reinforcement 40 to the floor 3 and the cross member 60. Thereby, it is possible to suppress the transfer of the collision load to the battery B during a side collision.

[0080] In the present embodiment, the fixing portion of the inner reinforcement 40 to the inner side wall portion 23 is located above the vertical center of the inner side wall portion 23. Thus, the collision load is easily transferred from the inner reinforcement 40 to the upper portion of the inner side wall portion 23. Thereby, the collision load is easily transferred from the inner reinforcement 40 to the cross member 60, and therefore it is possible to suppress the transfer of the collision load to the battery B during a side collision.

[0081] In the present embodiment, the connecting surface portion 33 has a surface extending in the vertical direction and the front-rear direction, and coincides with the cross member 60 in the front-rear direction. The connecting surface portion 33 contacts the inner reinforcement 40 over as large a range as possible, so that the collision load can be dispersed and input into the inner reinforcement 40. Moreover, since the connecting surface portion 33 coincides with the cross member 60 in the front-rear direction, the transfer path of the collision load can be made as short as possible. Thereby, the collision load is efficiently transferred from the outer reinforcement 30 to the cross member 60, and therefore it is possible to suppress the transfer of the collision load to the battery B during a side collision.

[0082] In the present embodiment, the inner reinforcement 40 has a longitudinal surface portion 43 fixed to the inner upper wall portion 21 and the inner side wall portion 23 and extending in the vertical direction and the vehicle width direction. Thus, the collision load is efficiently transferred from the outer reinforcement 30 to the cross member 60 via the longitudinal surface portion 43. Thereby, it is possible to suppress the transfer of the collision load to the battery B during a side collision.

[0083] In the present embodiment, the longitudinal surface portion 43 coincides with the cross member 60 in the vehicle front-rear direction. Thus, the transfer path of the collision load is made as short as possible, so that the collision load is efficiently transferred from the outer reinforcement 30 to the cross member 60. Thereby, it is possible to suppress the transfer of the collision load to the battery B during a side collision.

[0084] In the present embodiment, the inner reinforcing member 40 has a horizontal surface portion 41a, which coincides with the battery B in the vehicle front-rear direction in the position of the arrangement area, extends in the vehicle front-rear direction and the vehicle width direction, and is fixed to the inner side wall portion. The horizontal surface portion 41a is located below the vertical surface portion 43 and is separated from the inner lower wall portion 22 in the up-down direction. Through the horizontal surface portion 41a, the collision load is transmitted to the inner side wall portion 23 in the front-rear direction over as large a range as possible. When the connecting surface portion 33 abuts against the inner reinforcing member 40, even if the vertical surface portion 43 rotates and displaces due to the collision load, the downward displacement of the vertical surface portion 43 can be suppressed by the horizontal surface portion 41a. Thus, it is possible to suppress the direct transmission of the collision load to the support portion of the battery.

[0085] In the present embodiment, the vertical surface portion 43 has a reinforcing rib 43a that slopes upward from the outside in the vehicle width direction toward the inside in the vehicle width direction. Through the reinforcing rib 43a, the collision load is efficiently transmitted to the inside and upward in the vehicle width direction. Thus, the collision load is transmitted to the cross member 60, and therefore it is possible to suppress the transmission of the collision load to the battery B during a side collision.

[0086] In the present embodiment, the vertical surface portion 43 and the fixing portion of the inner upper wall portion 21 are further overlapped and fixed with a cross member 60. As a result, the rigidity of the fixing portion of the vertical surface portion 43 and the inner upper wall portion 21 becomes higher, and therefore the collision load is efficiently transmitted from the outer reinforcing member 30 to the cross member 60 via the vertical surface portion 43. Thus, it is possible to suppress the transmission of the collision load to the battery B during a side collision.

[0087] In the present embodiment, the vertical surface portion 43 is fixed to the horizontal surface portion 41a. Thus, even if the side collision position is outside the position of the vertical surface portion 43, the collision load is transmitted to the vertical surface portion 43 via the horizontal surface portion 41a. Therefore, the collision load is efficiently transmitted from the outer reinforcing member 30 to the cross member 60 via the horizontal surface portion 41a and the vertical surface portion 43. Thus, it is possible to suppress the transmission of the collision load to the battery B during a side collision.

[0088] In the present embodiment, the inner reinforcing member 40 has an inner bent portion 41b that bends upward from the end portion on the inner side in the vehicle width direction of the horizontal surface portion 41a, and the vertical surface portion 43 and the fixing portion of the inner side wall portion 23 are further overlapped and fixed with the inner bent portion 41b. The rigidity of the fixing portion of the vertical surface portion 43 and the inner side wall portion 23 becomes higher, and therefore the collision load is efficiently transmitted from the outer reinforcing member 30 to the cross member 60 via the vertical surface portion 43. Thus, it is possible to suppress the transmission of the collision load to the battery B during a side collision.

[0089] (Other embodiments) The technology disclosed herein is not limited by the foregoing embodiments and can be used interchangeably within the scope not exceeding the gist of the claims.

[0090] In the described embodiment, the center of the inner reinforcing member 40 in the vertical direction is located above the center of the connecting surface portion 33 in the vertical direction. The present invention is not limited to this, and the center of the inner reinforcing member 40 in the vertical direction may also be located at the same position as the center of the connecting surface portion 33 in the vertical direction.

[0091] In the described embodiment, the inner reinforcing member 40 has a first inner reinforcing member 41 and a second inner reinforcing member. The present invention is not limited to this, and the inner reinforcing member 40 may also be composed only of the second inner reinforcing member.

[0092] In the described embodiment, the vertical surface portion 43 is fixed to the horizontal surface portion 41a. The present invention is not limited to this, and the vertical surface portion 43 may not be fixed to the horizontal surface portion 41a.

[0093] In the described embodiment, the second inner reinforcing member 42 has a transverse surface portion 44, but the transverse surface portion 44 is not an essential structure and may be omitted.

[0094] In the described embodiment, the vertical surface portion 43 has a reinforcing rib 43a, but the reinforcing rib 43a is not an essential structure and may be omitted.

[0095] In the described embodiment, the corner portion between the lower side surface portion 32 and the lower side flange 35 has a deformation promoting portion 36, but the deformation promoting portion 36 is not an essential structure and may be omitted.

[0096] The foregoing embodiments are merely illustrative, and no limiting interpretation should be made on the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications or changes within the equivalent scope of the claims belong to the scope of the present disclosure.

[0097]

Practicality

[0098]

Number Explanation

Claims

1. A lower body structure of a vehicle, characterized in that Comprising: Left and right paired side beams having a closed cross-section structure extending in the vehicle longitudinal direction; A floor fixed to the side beams and constituting the floor of the cockpit; A battery disposed below the floor; A cross beam extending in the vehicle width direction, and both end portions in the vehicle width direction are fixed to the side beams at positions above the floor; wherein, The side beam has: An outer wall portion which is a wall surface located on the outer side in the vehicle width direction and extending in the vertical direction and the vehicle longitudinal direction; An inner wall portion which is a wall surface located on the inner side in the vehicle width direction and extending in the vertical direction and the vehicle longitudinal direction; An upper wall portion extending in the vehicle width direction from the upper end portions of the outer wall portion and the inner wall portion; A lower wall portion extending in the vehicle width direction from the lower end portions of the outer wall portion and the inner wall portion; An outer reinforcing member fixed to the outer wall portion inside the closed cross-section structure; An inner reinforcing member fixed to the upper wall portion and the inner wall portion inside the closed cross-section structure; The cross beam is fixed to the upper wall portion, The battery is supported by the lower wall portion, The outer reinforcing member has a overlapping portion which is located on the inner side in the vehicle width direction compared with other portions of the outer reinforcing member and overlaps with the inner reinforcing member in the vertical direction, The inner reinforcing member is separated from the lower wall portion in the vertical direction.

2. The lower body structure of a vehicle according to claim 1, characterized in that: The center of the inner reinforcing member in the vertical direction is located at a position above the center of the overlapping portion in the vertical direction.

3. The lower body structure of a vehicle according to claim 1, characterized in that: The fixing portion of the inner reinforcing member and the inner wall portion is located at a position above the center of the inner wall portion in the vertical direction.

4. The lower body structure of a vehicle according to claim 1, characterized in that: The overlapping portion has a surface extending in the vertical direction and the vehicle longitudinal direction and coincides with the cross beam in the vehicle longitudinal direction.

5. The lower body structure of a vehicle according to any one of claims 1 to 4, characterized in that: The inner reinforcing member has a longitudinal surface portion fixed to the upper wall portion and the inner wall portion and extending in the vertical direction and the vehicle width direction.

6. The lower body structure of a vehicle according to claim 5, characterized in that: The longitudinal surface portion coincides with the cross beam in the vehicle longitudinal direction.

7. The lower body structure of a vehicle according to claim 5, characterized in that: The inner reinforcing member has a horizontal surface portion which coincides with the battery arrangement area in the vehicle longitudinal direction and extends in the vehicle longitudinal direction and the vehicle width direction and is fixed to the inner wall portion, The horizontal surface portion is located below the longitudinal surface portion and is separated from the lower wall portion in the vertical direction.

8. The lower body structure of a vehicle according to claim 5, characterized in that: The longitudinal surface portion has a reinforcing rib inclined upward from the outer side in the vehicle width direction toward the inner side in the vehicle width direction.

9. The lower body structure of a vehicle according to claim 5, characterized in that: The longitudinal surface further overlaps with the fixed portion of the upper wall portion and the cross beam is fixed thereto.

10. The lower body structure of a vehicle according to claim 7, characterized in that: The longitudinal surface is fixed to the horizontal surface.

11. The lower body structure of a vehicle according to claim 7, characterized in that: The inner reinforcing member has an inner bent portion that bends upward from the end portion on the inner side in the vehicle width direction of the horizontal surface, The fixed portion of the longitudinal surface and the inner side wall portion further overlap and the inner bent portion is fixed thereto.

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