Vehicle body structure member

Abstract

To provide a vehicle body structure member that is able to prevent deformation of a floor cross member in a vertical direction of a vehicle.SOLUTION: A rocker 12 is divided in a fore-aft direction of a vehicle and includes a rocker front part 24 and a rocker rear part 26. A connection member 20 is connected to the rocker front part 24, the rocker rear part 26, a center pillar 14 and a floor cross member 16 while covering them from outside. Further, the connection member 20 has a rib 46 projecting in an extending direction of the floor cross member 16, between a third connection portion 34 and a fourth connection portion 44. Accordingly, the rigidity of the connection member 20 itself can be improved. Moreover, angles formed by the rocker 12, the center pillar 14, and the floor cross member 16 are maintained, making it possible to prevent the floor cross member 16 from deforming in a vertical direction of the vehicle due to road-surface input during traveling of the vehicle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle body structural member. [Background technology]

[0002] The following Patent Document 1 discloses technology relating to an automobile body structure in which at least one of the inner frame or outer frame is formed from a cast material and has a frame intersection that forms a closed cross section by joining the inner frame and the outer frame.

[0003] Furthermore, in this prior art, at the intersection of at least one of the inner frame or outer frame, a rib is extended from one frame toward the other frame, and the closed cross section is closed by the rib, thereby improving the rigidity of the intersection of the frames. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 07-267139 Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, in the case of an electric vehicle, if the floor panel does not have a tunnel portion extending in the longitudinal direction of the vehicle on the upper surface and a reinforcement provided on the lower surface, the surface rigidity of the floor panel will decrease. When the surface rigidity of the floor panel decreases, the floor cross member extending in the transverse direction of the vehicle on the upper surface side of the floor panel may deform in the vertical direction of the vehicle.

[0006] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle body structural member that can suppress deformation of a floor cross member in the vertical direction of the vehicle. [Means for solving the problem]

[0007] The vehicle body structural member according to the invention of claim 1 comprises a rocker provided at an end of a floor panel in the vehicle width direction, extending in the vehicle longitudinal direction and including a rocker front portion and a rocker rear portion separated into the front and rear of the vehicle, a center pillar extending in the vehicle vertical direction at approximately the center in the vehicle longitudinal direction, and a floor cross member extending along the vehicle width direction on the floor panel, the rocker front portion, the rocker rear portion, the center pillar, and the floor cross member being arranged at an intersection of these rocker front portion and the rocker rear portion, the rocker front portion and the rocker rear portion ... The connecting member is configured to include a connecting portion, a second connecting portion provided at the rear end of the connecting member in the vehicle longitudinal direction and connected to the front end of the rear portion of the rocker in a state of covering the outside, a third connecting portion provided at the center of the connecting member in the vehicle longitudinal direction and at the upper end of the vehicle vertical direction and connected to the lower end of the center pillar in a state of covering the outside, a fourth connecting portion provided lower in the vehicle vertical direction than the third connecting portion and connected to the end of the floor cross member in the vehicle width direction in a state of covering the outside, and a rib formed between the third connecting portion and the fourth connecting portion and protruding along the extension direction of the floor cross member.

[0008] The vehicle body structural member according to the invention of claim 1 includes a connecting member disposed at the intersection of a rocker, a center pillar, and a floor cross member. The rocker is divided into a front portion and a rear portion of the rocker and is capable of connecting the front portion of the rocker, the rear portion of the rocker, the center pillar, and the floor cross member.

[0009] Here, the connecting member includes a first connecting portion, a second connecting portion, a third connecting portion, a fourth connecting portion, and a rib. The first connecting portion is provided at the front end of the connecting member and is connected to the rear end of the front part of the rocker in a state where it covers the outside. The second connecting portion is provided at the rear end of the connecting member and is connected to the front end of the rear part of the rocker in a state where it covers the outside.

[0010] The third connecting portion is located at the upper end of the connecting member in the vehicle longitudinal direction and is connected to the lower end of the center pillar while covering the lower end of the center pillar from the outside. The fourth connecting portion is located below the third connecting portion and is connected to the end of the floor cross member in the vehicle width direction while covering the lower end of the floor cross member from the outside.

[0011] In the present invention, the front and rear rocker sections, the center pillar and the floor cross member are joined with the connecting member in a state where a portion of each connecting member is covered from the outside, thereby making it possible to improve rigidity at the intersection compared to when the end faces of the members are abutted against each other and welded, glued, etc. to each other.

[0012] In addition, in the present invention, the rocker (front and rear parts of the rocker), center pillar and floor cross member are each connected via connecting members, which adds rigidity to the connecting members themselves and makes it possible to improve rigidity at the intersections compared to when no connecting members are provided.

[0013] Furthermore, in the present invention, a rib is formed between the third and fourth joints, which improves the rigidity of the joint member itself. The rib also protrudes along the extension direction of the floor cross member, which makes it possible to prevent the floor cross member from deforming upward in the vehicle starting from the rocker side.

[0014] With the above-described configuration, the present invention maintains the angles formed by the rocker, center pillar, and floor cross member relative to one another, making it possible to suppress deformation of the floor cross member in the vertical direction of the vehicle due to road input while the vehicle is in motion. In this way, by improving the rigidity of the floor cross member, seat vibration is suppressed, improving ride comfort and improving handling stability.

[0015] The vehicle body structural member of the invention described in claim 2 is a vehicle body structural member of the invention described in claim 1, in which the cross-sectional shape of the floor cross member when cut along a direction approximately perpendicular to the extension direction is approximately an inverted U-shape with an opening on the floor panel side, and the rib is formed front and rear in the fore-and-aft direction of the vehicle approximately along the ridge line of the floor cross member, and extends so as to bridge the third joint and the fourth joint.

[0016] In the vehicle body structural member according to the invention of claim 2, the cross section of the floor cross member cut along a direction substantially perpendicular to the extension direction has a substantially inverted U shape with the opening facing the floor panel. That is, the floor cross member includes a front wall portion constituting the front end in the vehicle longitudinal direction, a rear wall portion constituting the rear end in the vehicle longitudinal direction, and an upper wall portion constituting the upper end in the vehicle vertical direction, and ridge lines are provided at the boundary between the front wall portion and the upper wall portion and at the boundary between the rear wall portion and the upper wall portion.

[0017] The ribs are formed at the front and rear of the floor cross member in the vehicle longitudinal direction, approximately along the ridge line of the floor cross member, and extend between the third and fourth joints. By providing the ribs in this way, it is possible to improve the rigidity of the joint member itself.

[0018] In addition, by providing a rib along the ridge line, it is possible to effectively maintain the angle between the third joint and the fourth joint, making it possible to prevent the floor cross member from deforming toward the upper side of the vehicle, starting from the rocker side.

[0019] The vehicle body structural member of the invention described in claim 3 is a vehicle body structural member of the invention described in claim 1, in which a reinforcing member is provided on the inside of the floor cross member, including the third joint portion, and is fastened together with the third joint portion and the floor cross member.

[0020] In the vehicle body structural member according to the invention of claim 3, a reinforcing member is provided inside the floor cross member, including the third joint, and the reinforcing member is fastened together with the third joint and the floor cross member. This makes it possible to improve the rigidity of the floor cross member. Therefore, this invention makes it possible to suppress deformation of the floor cross member in the vehicle's vertical direction due to road surface input while the vehicle is traveling, suppressing seat vibration and improving ride comfort. In addition, handling stability is improved.

[0021] A vehicle body structural member according to the invention recited in claim 4 is the vehicle body structural member according to the invention recited in claim 1, wherein a solid portion is provided between the first joint portion and the second joint portion.

[0022] In the vehicle body structural member according to the invention of claim 4, a solid portion is provided between the first joint portion and the second joint portion. This forms a solid portion in the rocker between the front portion and the rear portion of the rocker. This makes it possible to suppress collapse of the cross section of the rocker that occurs as the floor cross member deforms in the vehicle's vertical direction.

[0023] Furthermore, by providing solid portions in the connecting members that connect the rocker, center pillar, and floor cross member, the path of sound penetration during vehicle travel is blocked, reducing high-frequency road noise. Furthermore, by reducing floor panel noise, muffled noise is reduced. Furthermore, this invention eliminates the need for foaming agents that are used to reduce noise, enabling corresponding cost savings. [Effects of the Invention]

[0024] As described above, the vehicle body structural member according to the present invention can suppress deformation of the floor cross member in the vertical direction of the vehicle. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view showing a state in which a connecting member that constitutes a vehicle body structural member according to an embodiment is connected to a rocker, a center pillar, and a floor cross member. FIG. [Figure 2] FIG. 2 is a perspective view showing a connecting member that constitutes a vehicle body structural member according to the embodiment. [Figure 3] 1 is a side view seen from the inside in the vehicle width direction, showing a state in which a connecting member that constitutes a vehicle body structural member according to an embodiment is connected to a rocker, a center pillar, and a floor cross member. FIG. [Figure 4] FIG. 2 is an end view taken along the line AA shown in FIG. [Figure 5A] FIG. 2 is an end view taken along line BB shown in FIG. [Figure 5B] 2 is an end view taken along line CC shown in FIG. 1. FIG. [Figure 6] 1 is a diagram illustrating the operation of a vehicle to which a vehicle body structural member according to an embodiment is applied; DETAILED DESCRIPTION OF THE INVENTION

[0026] The vehicle body structural member according to the present invention will be described below with reference to the drawings. Note that the arrow FR shown as appropriate in each drawing indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow RH indicates the right side in the vehicle width direction. Hereinafter, when the directions of front-rear, up-down, and left-right are simply used in the description, they refer to front-rear in the front-rear direction of the vehicle, up-down in the vehicle up-down direction, and left-right in the vehicle width direction when facing the direction of travel, unless otherwise specified.

[0027] (Configuration of body structural members) First, the configuration of the vehicle body structural member according to this embodiment will be described.

[0028] 1 is applicable to electric vehicles, fuel cell vehicles, etc., which run on power generated by a power unit (not shown). The vehicle body structural member 10 in this embodiment is configured to include a connecting member 20 disposed at an intersection 18 between a rocker 12, a center pillar 14, and a floor cross member 16.

[0029] The rockers 12 extend in the front-to-rear direction of the vehicle at both ends in the vehicle width direction of a floor panel 22 that forms the floor of the vehicle interior. A pair of rockers 12 are provided, one on the left and one on the right, and although not shown, a battery is disposed inside the pair of rockers 12 in the vehicle width direction.

[0030] The rocker 12 is divided into a front portion and a rear portion of the vehicle, and is configured to include a front portion 24 and a rear portion 26. The rocker 12 has a closed cross-sectional structure in which a cross-section cut substantially perpendicular to the extension direction forms a substantially rectangular shape. The rocker 12 is formed, for example, by extrusion molding, and in this embodiment, as an example, it is formed from an extruded aluminum alloy material.

[0031] Although not shown, the rocker 12 may be composed of an outer panel disposed on the outside in the vehicle width direction and an inner panel disposed on the inside in the vehicle width direction and forming a closed cross-sectional structure between the outer panel and the inner panel. In this case, the outer panel and the inner panel are press-formed from steel plate or the like.

[0032] On the other hand, the center pillar 14 extends in the vertical direction of the vehicle at approximately the center in the longitudinal direction of the vehicle. Furthermore, the center pillar 14 is, for example, configured with an outer panel (not shown) disposed on the outer side in the vehicle width direction, and an inner panel (not shown) disposed on the inner side in the vehicle width direction and constituting a closed cross-sectional structure with a substantially rectangular cross-sectional shape between the outer panel and the inner panel. A plate-shaped reinforcement may be provided between the outer panel and the inner panel.

[0033] The floor cross member 16 extends along the vehicle width direction on the floor panel 22. The cross section of the floor cross member 16 cut along a direction substantially perpendicular to the extension direction has a substantially inverted U shape with an opening on the floor panel 22 side. The floor cross member 16 is formed, for example, by extrusion molding, and is formed from an extruded aluminum alloy material.

[0034] The floor cross member 16 is configured to include a front wall portion 16A that forms the front end of the floor cross member 16, a rear wall portion 16B that forms the rear end of the floor cross member 16, and an upper wall portion 16C that forms the upper end of the floor cross member 16 and connects the upper end of the front wall portion 16A with the upper end of the rear wall portion 16B. In the floor cross member 16, a ridge line P is provided at the boundary between the front wall portion 16A and the upper wall portion 16C, and a ridge line Q is provided at the boundary between the rear wall portion 16B and the upper wall portion 16C.

[0035] Furthermore, the lower ends of the front wall portion 16A and the rear wall portion 16B are provided with joint pieces 16D that bend toward each other, and these joint pieces 16D abut against the upper surface of the floor panel 22 so that they can be joined by spot welding or the like.

[0036] Furthermore, a bulk (reinforcing member) 28 is provided within the floor cross member 16 at the end 17 of the floor cross member 16. The bulk 28 is formed along the extension direction of the floor cross member 16, and as shown in Figure 5B, the cross section cut along a direction approximately perpendicular to the extension direction has a generally hat-like shape with an opening on the floor panel 22 side. Note that Figure 5B is an end view cut along line CC shown in Figure 1.

[0037] The bulk 28 is composed of a front wall portion 28A that faces the front wall portion 16A of the floor cross member 16, a rear wall portion 28B that faces the rear wall portion 16B of the floor cross member 16, and an upper wall portion 28C that abuts against the upper wall portion 16C of the floor cross member 16 and is spot welded (weld portion 29).

[0038] In addition, a joint piece 28D that bends away from each other is provided at the lower ends of the front wall portion 16A and the rear wall portion 16B, and this joint piece 28D can be joined to the joint piece 16D of the floor cross member 16 by arc welding (welding portion 31) or the like.

[0039] (Connecting member) Here, the connecting member 20 will be described.

[0040] The connecting member 20 shown in Fig. 2 is a cast member made of, for example, an aluminum alloy, a magnesium alloy, etc. As shown in Fig. 3, the connecting member 20 has a generally triangular shape with each apex cut off when viewed from the side of the vehicle, and is disposed between a rocker front portion 24 and a rocker rear portion 26.

[0041] 1 and 2, a first joint portion 30 is provided at the front end of the connecting member 20. The first joint portion 30 is generally U-shaped and opens downward. The first joint portion 30 includes an outer wall 30A provided on the outer side in the vehicle width direction, an inner wall 30B provided on the inner side in the vehicle width direction and capable of facing the outer wall 30A, and an upper wall portion 30C connecting the upper ends of the outer wall 30A and the inner wall 30B, and is configured to cover the rear end 25 of the rocker front portion 24 from the outside.

[0042] A second connecting portion 32 is provided at the rear end of the connecting member 20. The second connecting portion 32 is generally U-shaped and opens downward. The second connecting portion 32 includes an outer wall 32A provided on the outer side in the vehicle width direction, an inner wall 32B provided on the inner side in the vehicle width direction and capable of facing the outer wall 32A, and an upper wall portion 32C connecting the upper ends of the outer wall 32A and the inner wall 32B, and is configured to cover the front end 27 of the rocker rear portion 26 from the outside.

[0043] Furthermore, a third joint portion 34 is provided at the center and upper end of the connecting member 20 in the vehicle longitudinal direction. The third joint portion 34 is generally U-shaped with an opening facing outward from the vehicle. The third joint portion 34 includes a front wall portion 34A provided on the front side in the vehicle longitudinal direction, a rear wall portion 34B provided on the rear side in the vehicle longitudinal direction and capable of facing the front wall portion 34A, and an inner wall portion 34C connecting the inner ends of the front wall portion 34A and the rear wall portion 34B, and is configured to cover the lower end portion 15 of the center pillar 14 from the outside.

[0044] On the other hand, the connecting member 20 has a solid portion 36 between the first connecting portion 30 and the second connecting portion 32 and below the third connecting portion 34 .

[0045] Therefore, with the first connecting portion 30 of the connecting member 20 covering the rear end portion 25 of the rocker front portion 24 from the outside, the rear end of the rocker front portion 24 is positioned in contact with the solid portion 36. In this state, the rear end portion 25 of the rocker front portion 24 is fastened (connected) to the first connecting portion 30 by a bolt 38 via a weld nut or the like (not shown).

[0046] Furthermore, with the second connecting portion 32 of the connecting member 20 covering the front end portion 27 of the rocker rear portion 26 from the outside, the front end of the rocker rear portion 26 is positioned in contact with the solid portion 36. In this state, the front end portion 27 of the rocker rear portion 26 is fastened to the second connecting portion 32 with a bolt 40.

[0047] Furthermore, with the third connecting portion 34 of the connecting member 20 covering the lower end portion 15 of the center pillar 14 from the outside, the lower end of the center pillar 14 is positioned in contact with the solid portion 36. In this state, the lower end portion 15 of the center pillar 14 is fastened to the third connecting portion 34 with a bolt 42.

[0048] Meanwhile, a fourth joint portion 44 extends inward in the vehicle width direction from the center of the connecting member 20 in the vehicle fore-and-aft direction and below the third joint portion 34. The fourth joint portion 44 is generally U-shaped with an opening on the lower side. The fourth joint portion 44 includes a front wall portion 44A provided on the front side in the vehicle fore-and-aft direction, a rear wall portion 44B provided on the rear side in the vehicle fore-and-aft direction and capable of facing the front wall portion 44A, and an upper wall portion 44C connecting the upper ends of the front wall portion 44A and the rear wall portion 44B, and is configured to cover the end portion 17 of the floor cross member 16 from the outside.

[0049] Additionally, a pair of ribs 46 are provided along the vehicle width direction between the third joint portion 34 and the fourth joint portion 44. The ribs 46 extend so as to bridge the third joint portion 34 and the fourth joint portion 44 substantially along the ridge lines P, Q of the floor cross member 16, with the end portion 17 of the floor cross member 16 covered from the outside by the fourth joint portion 44.

[0050] Then, with the fourth connecting portion 44 of the connecting member 20 covering the end portion 17 of the floor cross member 16 from the outside, the end portion 17 of the floor cross member 16 is fastened to the fourth connecting portion 44 with bolts 48, 50, as shown in Figure 4. Note that Figure 4 is an end view taken along line AA shown in Figure 1.

[0051] Here, as mentioned above, at the end 17 of the floor cross member 16, the bulk 28 is provided inside the floor cross member 16. Therefore, the floor cross member 16 and the bulk 28 are fastened to the fourth joint 44.

[0052] As shown in Fig. 1, a seat rail 52 that allows a vehicle seat to slide is attached onto the end portion 17 of the floor cross member 16. For this reason, as shown in Fig. 5A, the seat rail 52 is fixed to the floor cross member 16 and the bulkhead 28 via a bolt 54. Note that Fig. 5A is an end view taken along line BB shown in Fig. 1.

[0053] (Actions and Effects of Body Structural Members) Next, the operation and effect of the vehicle body structural member according to this embodiment will be described.

[0054] As shown in Fig. 1, this embodiment includes a casting connecting member 20 that is arranged at an intersection 18 between the rocker 12, the center pillar 14, and the floor cross member 16. The rocker 12 is divided into a front and a rear part 24 and a rear part 26 of the vehicle, and the connecting member 20 is capable of connecting the rocker front part 24, the rocker rear part 26, the center pillar 14, and the floor cross member 16. In this embodiment, the connecting member 20 is formed by casting, which improves the degree of freedom in designing the connecting member 20.

[0055] In this embodiment, the connecting member 20 includes a first connecting portion 30, a second connecting portion 32, a third connecting portion 34, a fourth connecting portion 44, and a rib 46. The first connecting portion 30 is provided at the front end of the connecting member 20, and is connected to the rear end 25 of the rocker front portion 24 in a state where it covers the outside. The second connecting portion 32 is provided at the rear end of the connecting member 20, and is connected to the front end 27 of the rocker rear portion 26 in a state where it covers the outside.

[0056] The third connecting portion 34 is provided at the upper end and central portion of the connecting member 20 in the vehicle longitudinal direction, and is connected to the lower end 15 of the center pillar 14 while covering it from the outside. The fourth connecting portion 44 is provided below the third connecting portion 34, and is connected to the end 17 of the floor cross member 16 while covering it from the outside.

[0057] In this embodiment, the connecting member 20 is connected to the front rocker portion 24, the rear rocker portion 26, the center pillar 14, and the floor cross member 16 with a portion of the connecting member 20 being covered from the outside. As a comparative example (not shown), this embodiment makes it possible to improve rigidity compared to a case where the end faces of the members are abutted against each other at the intersection 18 and welded, glued, etc.

[0058] Furthermore, in this embodiment, the rocker front portion 24, rocker rear portion 26, center pillar 14, and floor cross member 16 are each connected at the intersection 18 via connecting member 20, so that the rigidity of the connecting member 20 itself is added, making it possible to improve the rigidity at the intersection 18 compared to when the connecting member 20 is not provided.

[0059] Furthermore, in this embodiment, a rib 46 is formed between the third joint portion 34 and the fourth joint portion 44, protruding along the extension direction of the floor cross member 16. This improves the rigidity of the joint member 20 itself.

[0060] With the above-described configuration, in this embodiment, the angle formed by the rocker 12, center pillar 14, and floor cross member 16 is maintained, making it possible to suppress deformation of the floor cross member 16 in the vertical direction of the vehicle due to road surface input while the vehicle is traveling.

[0061] In addition, in this embodiment, a bulk 28 is provided inside the floor cross member 16, and the bulk 28 is fastened together with the third joint 34 and the floor cross member 16. This makes it possible to improve the rigidity of the floor cross member 16.

[0062] Therefore, in this embodiment, it is possible to suppress deformation of the floor cross member 16 in the vertical direction of the vehicle due to road surface input while the vehicle is running, thereby suppressing seat vibration and improving ride comfort. Also, handling stability is improved. Note that the bulk 28 is not necessarily required, and it may be eliminated by changing the shape of the floor cross member 16, such as by increasing the plate thickness of the floor cross member 16.

[0063] On the other hand, the floor cross member 16 is composed of a front wall portion 16A, a rear wall portion 16B, and an upper wall portion 16C, and ridge lines P and Q are provided at the boundary between the front wall portion 16A and the upper wall portion 16C, and at the boundary between the rear wall portion 16B and the upper wall portion 16C, respectively.

[0064] The ribs 46 are formed at the front and rear in the vehicle longitudinal direction substantially along the ridgelines P and Q, and extend so as to bridge the third joint portion 34 and the fourth joint portion 44. Because the ridgelines P and Q have higher rigidity than other portions of the floor cross member 16, by providing the ribs 46 along the ridgelines P and Q, it is possible to effectively maintain the angle formed between the third joint portion 34 and the fourth joint portion 44.

[0065] Therefore, in this embodiment, it is possible to prevent the floor cross member 16 from deforming upwardly of the vehicle due to a moment M generated from the rocker 12 side as a result of road surface input while the vehicle is traveling, as shown in Figure 6. Note that the solid line is a diagram showing the state in which the floor cross member has been deformed, and the two-dot chain line is a diagram showing the state before the floor cross member is deformed.

[0066] In Figure 6, so-called cross-sectional collapse occurs in the rocker 12, but in this embodiment, as shown in Figures 1 and 2, a solid portion 36 is provided between the first joint portion 30 and the second joint portion 32. In other words, in the rocker 12, the solid portion 36 is formed between the rocker front portion 24 and the rocker rear portion 26. Therefore, in this embodiment, it is possible to suppress cross-sectional collapse in the rocker 12 that occurs as the floor cross member 16 deforms in the vehicle's up-down direction.

[0067] In this embodiment, the solid portion 36 is provided in the connecting member 20 that connects the rocker 12, center pillar 14, and floor cross member 16, thereby blocking the path of sound penetration while the vehicle is running and reducing high-frequency road noise. Furthermore, the reduction in noise generated by the floor panel 22 reduces muffled noise. Furthermore, in this embodiment, a foaming agent used to reduce noise is not required, which allows for cost savings. However, the solid portion 36 is not necessarily required.

[0068] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment may be appropriately combined with various modified examples, and the present invention may of course be embodied in various forms as long as it does not deviate from the gist of the present invention.

[0069] <Additional Notes> The following configurations may be appropriately combined to form a vehicle body structural member according to the present invention.

[0070] (Configuration 1) The vehicle body structural member is provided with a rocker provided at an end of the floor panel in the vehicle width direction, extending in the vehicle longitudinal direction, and including a rocker front portion and a rocker rear portion that are divided into the front and rear of the vehicle, a center pillar extending in the vehicle vertical direction at approximately the center in the vehicle longitudinal direction, and a floor cross member extending along the vehicle width direction on the floor panel, and is arranged at an intersection of these rocker, a center pillar extending in the vehicle vertical direction at approximately the center in the vehicle longitudinal direction, and a floor cross member, and is provided with connecting members that can connect the rocker front portion, the rocker rear portion, the center pillar, and the floor cross member, and the connecting member is provided at a front end of the connecting member in the vehicle longitudinal direction, and is connected to a rear end of the rocker front portion in the vehicle longitudinal direction while covering it from the outside, and a front connecting member The connecting member is configured to include a second connecting portion provided at the rear end portion in the vehicle longitudinal direction of the connecting member and connected to the front end portion in the vehicle longitudinal direction of the rear portion of the rocker in a state of covering the outside, a third connecting portion provided at the center portion in the vehicle longitudinal direction and at the upper end portion in the vehicle vertical direction of the connecting member and connected to the lower end portion in the vehicle vertical direction of the center pillar in a state of covering the outside, a fourth connecting portion provided lower in the vehicle vertical direction than the third connecting portion and connected to the end portion in the vehicle width direction of the floor cross member in a state of covering the outside, and a rib formed between the third connecting portion and the fourth connecting portion and protruding along the extension direction of the floor cross member.

[0071] (Configuration 2) The cross-sectional shape of the floor cross member when cut along a direction approximately perpendicular to the extension direction is approximately an inverted U-shape with the opening facing the floor panel, and the rib is formed at the front and rear of the vehicle in the fore-and-aft direction approximately along the ridge line of the floor cross member, and extends so as to bridge the third joint and the fourth joint.

[0072] (Configuration 3) A reinforcing member is provided on the inside of the floor cross member, including the third joint portion, and is fastened together with the third joint portion and the floor cross member.

[0073] (Configuration 4) A solid portion is provided between the first connecting portion and the second connecting portion. [Explanation of symbols]

[0074] 10 Body structural members 12 Rocca 14 Center pillar 15 Lower end (lower end of center pillar) 16 Floor cross member 17 End (end of floor cross member) 18 Intersection 20 Connecting member 22 Floor Panel 24 Front of the locker 25 Rear end (rear end of front of rocker) 26 Rear of the rocker 27 Front end (front end of rear of rocker) 28 Bulk (reinforcement member) 30 Joint part (1st joint part) 32 Joint part (second joint part) 34 Joint part (3rd joint part) 36 Solid part 44 Joint part (4th joint part) 46 Ribs P ridgeline Q Ridgeline

Claims

1. a rocker provided at an end of the floor panel in the vehicle width direction, extending in the vehicle longitudinal direction and including a rocker front portion and a rocker rear portion separated into the front and rear of the vehicle; a center pillar extending in the vehicle vertical direction at approximately the center in the vehicle longitudinal direction; and a floor cross member extending along the vehicle width direction on the floor panel, and connecting members are arranged at the intersection of these members, by which the rocker front portion, the rocker rear portion, the center pillar, and the floor cross member can be connected to each other; The coupling member is a first coupling portion provided at a front end portion of the coupling member in the vehicle longitudinal direction and coupled to a rear end portion of the rocker front portion in the vehicle longitudinal direction in a state of covering the rear end portion from the outside; a second coupling portion provided at a rear end portion of the coupling member in the vehicle longitudinal direction and coupled to a front end portion of the rocker rear portion in the vehicle longitudinal direction in a state of covering the front end portion from the outside; a third connecting portion that is provided at a central portion of the connecting member in the vehicle longitudinal direction and at an upper end portion of the connecting member in the vehicle vertical direction, and that is connected to a lower end portion of the center pillar in the vehicle vertical direction in a state where the third connecting portion covers the lower end portion of the center pillar from the outside; a fourth joint portion that is provided lower than the third joint portion in the vehicle up-down direction and that is joined to the end portion of the floor cross member in the vehicle width direction while covering the end portion from the outside; a rib formed between the third joint portion and the fourth joint portion and protruding along the extending direction of the floor cross member; A vehicle body structural member comprising:

2. The floor cross member has a cross section cut along a direction substantially perpendicular to the extending direction, the cross section having a substantially inverted U shape with an opening on the floor panel side, The vehicle body structural member of claim 1, wherein the rib is formed at the front and rear of the vehicle in the fore-and-aft direction approximately along the ridge line of the floor cross member and extends so as to bridge the third joint portion and the fourth joint portion.

3. 2. The vehicle body structural member according to claim 1, further comprising a reinforcing member provided on the inner side of the floor cross member, the reinforcing member including the third joint portion and fastened together with the third joint portion and the floor cross member.

4. The vehicle body structural member according to claim 1 , wherein a solid portion is provided between the first joint portion and the second joint portion.

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