Body structural members

Abstract

A vehicle body structural member capable of suppressing bending deformation when a collision load is input is obtained. [Solution] In an arch-shaped rear floor side member 20, horizontal ribs 68, 80, 92, etc. erected from a rear wall portion 40 of the rear floor side member 20 are formed along the input direction (vehicle longitudinal direction) of a collision load F. This makes it possible to suppress bending deformation of the rear floor side member 20 when a collision load is input to the rear floor side member 20 along the vehicle longitudinal direction.

Description

[Technical field]

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

[0002] Patent Document 1 discloses a technology relating to a vehicle body structure in which a front side member and a floor member are connected via a member (hereinafter referred to as a "vehicle body structural member") that is formed by aluminum die casting and that constitutes a closed cross-section. In the above prior art, a truss-shaped rib is formed on the closed cross-section of the vehicle body structural member to improve rigidity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-030961 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned prior art, when a collision load is input to a vehicle body structural member along the vehicle longitudinal direction, a bending moment is generated, which may cause a large bending deformation of the closed cross-sectional portion.

[0005] In consideration of the above, an object of the present invention is to provide a vehicle body structural member capable of suppressing bending deformation when a collision load is input. [Means for solving the problem]

[0006] The vehicle body structural member according to the present invention as set forth in claim 1 is a vehicle body structural member molded by a mold, and includes a general portion constituting a main portion of the vehicle body structural member, and a rib erected from the general portion and formed along an input direction of a collision load, the vehicle body structural member extending along a vehicle longitudinal direction and curved along a vehicle vertical direction or along a vehicle width direction to form an arch shape, a pair of side wall portions erected from outer edges of the general portion and formed at both ends in a width direction substantially perpendicular to the extending direction of the vehicle body structural member, a cross rib extending radially from an approximate center of curvature of a curved portion curved into an arch shape at an approximate center in the vehicle longitudinal direction of the vehicle body structural member, spanning between the pair of side wall portions and intersecting the rib, and a side wall portion of the pair of side wall portions that is on the approximate center side of the curvature of the curved portion. 1 The cross rib Only The connecting portion further includes a thick portion that is formed to be thicker than the plate thickness of the rib.

[0007] The vehicle body structural member according to the present invention recited in claim 1 is molded by a mold, and a rib is erected from a general portion constituting a main part of the vehicle body structural member, and the rib is formed along a transmission direction of a collision load.

[0008] By forming ribs on the general parts of the body structural member, the body structural member can be reinforced and the rigidity of the body structural member itself can be improved. In this way, by improving the rigidity of the body structural member itself, it becomes possible to suppress bending deformation in the body structural member when a collision load is input to the body structural member.

[0009] In the present invention, the rib is formed along the input direction of the collision load. As a comparative example, if the rib is formed along a direction intersecting the input direction of the collision load, when the collision load is input to the vehicle body structural member, a bending moment is generated in the vehicle body structural member, and the vehicle body structural member is bent and deformed, there is a possibility that the collision energy will not be sufficiently absorbed.

[0010] In contrast, in the present invention, as described above, the rib is formed along the input direction of the collision load, so that when a collision load is input to the vehicle body structural member, the collision load is transmitted along the rib. This allows the rib to be axially compressed. When the rib is axially compressed in this way, the deformation (elastic deformation and plastic deformation) of the rib effectively absorbs the collision energy.

[0012] On the other hand, in the present invention, Body structural members ,car Along both front and rear directions As it is extended, Curved along the vertical direction of the vehicle Also is curved along the vehicle width direction and formed into an arch shape.

[0013] For this reason, In the present invention, When a collision load is input in the vehicle front-to-rear direction of a vehicle due to a frontal collision of a vehicle (hereinafter referred to as a "vehicle frontal collision") or a rear-to-rear collision of a vehicle (hereinafter referred to as a "vehicle rear-to-rear collision"), the vehicle body structural member is formed in a so-called arch shape. So A bending moment is generated in the vehicle body structural members.

[0014] Therefore, in an arch-shaped vehicle body structural member as in the present invention, the ribs erected from the general portion of the vehicle body structural member are formed along the input direction of the collision load (the fore-aft direction of the vehicle), thereby making it possible to suppress the generation of bending moment when the collision load is input, and to suppress bending deformation of the vehicle body structural member. Further, in the present invention, a cross rib that crosses the rib extends radially from approximately the center of curvature of a curved portion that is curved in an arch shape at approximately the center in the vehicle front-rear direction of the vehicle body structural member, and the cross rib is bridged between a pair of side wall portions. 1 The cross rib Only The connecting portion is provided with a thick portion that is thicker than the plate thickness of the rib.

[0015] The vehicle body structural member according to the present invention described in claim 2 is a vehicle body structural member formed by a mold, the vehicle body structural member having a shape that protrudes upward in the vehicle up-down direction at an approximately central portion in the extension direction, and includes a general portion that constitutes a main portion of the vehicle body structural member, a rib that stands from the general portion and is formed along the input direction of a collision load, a pair of side wall portions that stand from outer edges of the general portion and are formed at both ends in a width direction that is approximately perpendicular to the extension direction of the vehicle body structural member, and a rib that stands from an outer edge of the general portion and is formed at both ends in a width direction that is approximately perpendicular to the extension direction of the vehicle body structural member, and a rib that is located below the approximately central portion from one of the side wall portions to the other of the side wall portions. The approximate curvature of the convex shape An intersecting rib extending radially from a center of curvature and intersecting the rib; and a side wall portion located on the lower side in the vehicle vertical direction out of the pair of side wall portions. 1 The cross rib Only and a thick portion provided at the connecting portion and formed to be thicker than the plate thickness of the rib. The vehicle body structural member according to the present invention as set forth in claim 2 is molded using a mold, and the vehicle body structural member has a shape that protrudes upward in the vehicle vertical direction at approximately the center in the extension direction, and is composed of a general portion, a rib, a pair of side wall portions, and a cross rib. The general portion constitutes the main portion of the vehicle body structural member, and the rib stands upright from the general portion and is formed along the input direction of the collision load. The pair of side wall portions stand upright from the outer edge of the general portion, and are formed at both ends in the width direction approximately perpendicular to the extension direction of the vehicle body structural member. The cross rib is located below approximately the center from one side wall portion to the other side wall portion. The approximate curvature of the convex shape The rib extends radially from the center of curvature and intersects with the rib. The lower side wall of the pair of side walls and 1 The cross rib Only The connecting portion is provided with a thick portion that is thicker than the plate thickness of the rib. The vehicle body structural member according to the present invention described in claim 3 is the vehicle body structural member according to the present invention described in claim 1 or 2, in which the connecting portions of the adjacent cross ribs to the side wall portions do not abut against each other. The vehicle body structural member of the present invention described in claim 4 is the vehicle body structural member of the present invention described in claim 2, in which the vehicle body structural member is curved in the vehicle up-down direction or the vehicle width direction and formed in an arch shape. A vehicle body structural member according to the present invention as set forth in claim 5 is the vehicle body structural member as set forth in any one of claims 1 to 4, wherein the rib includes a transverse rib formed along the vehicle front-rear direction.

[0016] In the vehicle body structural member according to the present invention described in claim 5, the rib is formed along the vehicle front-rear direction. The present invention relates to a method for manufacturing a lateral rib. Therefore, when a collision load is input in the vehicle body structural member along the vehicle longitudinal direction due to a frontal collision or a rearward collision of the vehicle, the collision load is The relevant side The force is transmitted along the rib. beside The ribs are axially compressible. beside The ribs are axially compressed, thereby enabling them to effectively absorb collision energy.

[0017] Claim 6 The vehicle body structural member according to the present invention described in claim 1 Any one of claims 5 to 5 In the vehicle body structural member according to the present invention, The rib is connected to at least one of the pair of side walls.

[0018] Claim 6 In the vehicle body structural member according to the present invention described above, At least one of the pair of side wall portions Connected to ribs Ruko This further reinforces the vehicle body structural member, thereby further improving the rigidity of the vehicle body structural member itself. The vehicle body structural member of the present invention described in claim 7 is a vehicle body structural member described in any one of claims 1 to 6, in which the rib and at least one of the pair of side wall portions are connected by a thick portion formed to be thicker than the plate thickness of the rib. The vehicle body structural member of the present invention described in claim 8 is a vehicle body structural member described in any one of claims 1 to 7, in which the pair of side wall portions are arranged above and below in the vehicle vertical direction, and the rib and the lower one of the pair of side wall portions are connected by a thick-wall portion formed to be thicker than the plate thickness of the rib.

[0019] Claim 9 The vehicle body structural member according to the present invention described above is Any one of claims 1 to 6 In the vehicle body structural member according to the present invention, the inner side wall portion curved in an arch shape is omitted A central portion is formed in at least one of the front and rear portions of the vehicle front-rear direction of the vehicle body structural member. Horizontal lines formed along the vehicle's fore-and-aft direction It is formed continuously with the rib along the front-rear direction of the vehicle.

[0020] Claim 9In the vehicle body structural member according to the present invention described above, beside The rib and the side wall portion are formed continuously along the vehicle front-rear direction, so that the side wall portion and beside The rib is integrated in the vehicle front-rear direction and becomes a part of the load transmitting member. beside The rib and the side wall portion are continuously formed along the vehicle front-rear direction, and the side wall portion is beside This allows the rib to be used as a part of the side wall. beside Compared to when ribs were formed, beside Since there is no need to form ribs, it is possible to reduce the weight of the vehicle body structural members. Claim 10 The vehicle body structural member according to the present invention described in claims 1 to 5 9 In the vehicle body structural member according to any one of claims 1 to 5, in a front portion of the vehicle front-rear direction of the vehicle body structural member, Horizontal lines formed along the vehicle's fore-and-aft direction The rib is a first horizontal rib extending between the pair of side wall portions. Claim 11 The vehicle body structural member according to the present invention described in claims 1 to 5 10 In the vehicle body structural member according to any one of claims 1 to 5, in a rear portion of the vehicle front-rear direction of the vehicle body structural member, Horizontal lines formed along the vehicle's fore-and-aft direction The rib is a second horizontal rib extending between the pair of side wall portions.

[0021] Claim 12 The vehicle body structural member according to the present invention described in claims 1 to 5 11 In the vehicle body structural member described in any one of claims 1 to 5, the vehicle body structural member is arranged along the vehicle fore-and-aft direction and is formed in an arch shape curved along the vehicle up-and-down direction, and the rib is arranged at both ends of the vehicle fore-and-aft direction of the vehicle body structural member above the vehicle up-and-down height position of the centroid of a cross section cut along a direction intersecting the vehicle fore-and-aft direction of the vehicle body structural member, and is arranged at a center of the vehicle fore-and-aft direction of the vehicle body structural member below the vehicle up-and-down height position of the centroid of a cross section cut along a direction intersecting the vehicle fore-and-aft direction of the vehicle body structural member.

[0022] Claim 12 The vehicle body structural member according to the present invention described above is disposed along the vehicle longitudinal direction and is formed in an arch shape curved along the vehicle vertical direction. In other words, the front and rear parts of the vehicle longitudinal direction of the vehicle body structural member are disposed lower in the vehicle vertical direction than the center part of the vehicle longitudinal direction of the vehicle body structural member. The vehicle body structural member of the present invention described in claim 13 is a vehicle body structural member described in any one of claims 1 to 12, in which a first vertical rib is provided at the front portion of the vehicle in the fore-and-aft direction of the vehicle, formed along the vehicle up-down direction and spanning between the pair of side wall portions. The vehicle body structural member of the present invention described in claim 14 is a vehicle body structural member described in any one of claims 1 to 13, in which a second vertical rib is provided at the rear of the vehicle in the fore-and-aft direction of the vehicle, formed along the vehicle up-down direction and spanning between the pair of side wall portions.

[0023] For this reason, at both ends of the vehicle body structural member in the vehicle fore-and-aft direction, the rib is disposed above the vehicle up-and-down height position of the centroid in a cross section cut along a direction intersecting the vehicle fore-and-aft direction of the vehicle body structural member (hereinafter referred to as "vehicle up-and-down direction and vehicle width direction"), while at the vehicle fore-and-aft center of the vehicle body structural member, the rib is disposed below the vehicle up-and-down height position of the centroid in a cross section of the vehicle body structural member cut along the vehicle up-and-down direction and vehicle width direction.

[0024] That is, in a vehicle body structural member formed in an arch shape curved along the vehicle vertical direction, by adjusting the vehicle vertical height positions of the ribs at both ends and the center of the vehicle front-rear direction of the vehicle body structural member, the vehicle vertical height positions of the centroids of each cross section of the vehicle front-rear direction of the vehicle body structural member can be made substantially constant in the vehicle vertical direction, thereby making it possible to suppress the occurrence of bending moments in the vehicle body structural member during a frontal collision or a rear-end collision. Effect of the Invention

[0025] Claim 1~Claim 4 The vehicle body structural member described in the above has an excellent effect of being able to suppress bending deformation when a collision load is input.

[0027] Claim 5 The vehicle body structural member described in the above has an excellent effect of being able to absorb a larger collision energy in a given stroke.

[0028] Claim6~ Claim 8 The vehicle body structural member described in has the excellent effect of further improving the rigidity of the vehicle body structural member itself.

[0029] Claim 9 The vehicle body structural member described in the above has the excellent effect of improving the rigidity of the vehicle body structural member itself and reducing the weight of the vehicle body structural member. Claim 10 , claim 13 The vehicle body structural member described in has the excellent effect of further improving the rigidity of the vehicle body structural member itself at a front portion of the vehicle in the longitudinal direction of the vehicle. Claim 11 , claim 14 The vehicle body structural member described in has the excellent effect of further improving the rigidity of the vehicle body structural member itself at a rear portion of the vehicle in the longitudinal direction of the vehicle.

[0030] Claim 12 The vehicle body structural member described in the above has an excellent effect of suppressing the occurrence of bending moment in the event of a frontal collision or a rearward collision of the vehicle. [Brief description of the drawings]

[0031] [Figure 1] 1 is a plan view showing the rear side of a vehicle lower portion equipped with a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied. [Diagram 2] 1 is a side view showing a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied. [Diagram 3] 1 is a side view of a rear floor side member for explaining the arrangement of ribs formed on the rear floor side member to which a vehicle body structural member according to one embodiment of the present invention is applied. FIG. [Figure 4] 3 is a side view showing a schematic view of the rear floor side member shown in FIG. 2. [Diagram 5] FIG. 5 is a side view of a comparative example and corresponds to FIG. [Figure 6] 1 is a side view showing a front side member barrier to which a vehicle body structural member according to an embodiment of the present invention is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] A vehicle body structural member according to an embodiment of the present invention will be described. Note that the arrow FR shown as appropriate in each drawing indicates the front side in the vehicle longitudinal direction, and the arrow UP indicates the upper side in the vehicle vertical direction. Also, the arrow OUT indicates the outside in the vehicle width direction. Hereinafter, when the directions of front / rear, left / right, and up / down are simply used for the description, they refer to front / rear in the vehicle longitudinal direction, left / right in the vehicle lateral direction (vehicle width direction), and up / down in the vehicle vertical direction, unless otherwise specified.

[0033] "Configuration of vehicle body structural components" First, the configuration of a vehicle to which the vehicle body structural member according to the present embodiment is applied will be described.

[0034] FIG. 1 shows a plan view of a lower part 12 of a vehicle 10 (hereinafter referred to as the "vehicle lower part") to which a vehicle body structural member according to this embodiment is applied, showing the rear part 14 of the vehicle 10 (hereinafter referred to as the "vehicle rear part").

[0035] As shown in this figure, rockers 18 extending in the vehicle front-rear direction are provided on the left and right sides of a side portion 16 of a vehicle 10 (hereinafter referred to as "vehicle side portion") of the vehicle. The left and right rockers 18 have a closed cross-sectional shape when cut in a direction perpendicular to the longitudinal direction of the rockers 18 (the vehicle vertical direction and the vehicle width direction), and each of them constitutes a part of the framework of the vehicle side portion 16.

[0036] A floor panel 24 is provided between the left and right rockers 18, extending in the vehicle fore-and-aft direction and in the vehicle width direction, and constituting the floor surface of the vehicle interior (cabin) 22, and both ends of the floor panel 24 in the vehicle width direction are respectively joined to the left and right rockers 18. In addition, a floor cross member 28 is disposed along the vehicle width direction between the left and right rockers 18 on the rear end side of the rocker 18 in the vehicle fore-and-aft direction, and the floor cross member 28 is joined onto the floor panel 24.

[0037] Additionally, rear floor side members 20 extend along the vehicle front-rear direction on the rear sides of the left and right rockers 18. A center floor panel 26 is provided between the left and right rear floor side members 20, located rearward of the floor panel 24 in the vehicle front-rear direction, extending along the vehicle front-rear direction and the vehicle width direction to form the floor surface on the rear side of the passenger compartment 22. Both ends of the center floor panel 26 in the vehicle width direction are joined to the left and right rear floor side members 20, respectively.

[0038] In addition, a floor cross member 30 is arranged along the vehicle width direction between the left and right rear floor side members 20 in the central portion 52 of the rear floor side member 20 in the vehicle fore-and-aft direction, and the floor cross member 30 is joined onto the center floor panel 26.

[0039] Furthermore, a floor cross member 32 is disposed along the width direction of the vehicle between the left and right rear floor side members 20 at the rear portion 54 in the vehicle front-rear direction of the rear floor side members 20. Like the floor cross member 30 described above, the floor cross member 32 is also joined onto the center floor panel 26.

[0040] A fuel tank 34 is disposed below the center floor panel 26 on the front 50 side of the left and right rear floor side members 20 in the vehicle fore-and-aft direction, that is, between the floor cross member 28 and the floor cross member 30. In addition, although not shown, a suspension tower 36 to which a shock absorber is attached and the like are provided on the outer sides of the left and right rear floor side members 20 in the vehicle width direction.

[0041] Furthermore, rear floor side member barriers 38 extend along the vehicle front-rear direction on the rear sides of the left and right rear floor side members 20. A rear floor panel 37 that extends along the vehicle front-rear direction and the vehicle width direction and forms the floor surface of the luggage compartment 35 is provided on the rear side of the center floor panel 26 in the vehicle front-rear direction. Rear floor side panels 39 that extend along the vehicle front-rear direction and the vehicle width direction are provided on both outer sides of the rear floor panel 37 in the vehicle width direction, and the left and right rear floor side member barriers 38 are each joined to these rear floor side panels 39.

[0042] [Rear floor side member] Here, the rear floor side member 20 as a vehicle body structural member according to this embodiment will be described in detail. First, the basic structure of the rear floor side member 20 will be described, and then the main parts of the rear floor side member 20 will be described.

[0043] <Basic configuration of rear floor side member> As shown in Fig. 1, the rear floor side member 20 is curved so as to protrude inward in the vehicle width direction in a plan view, and as shown in Fig. 2, the rear floor side member 20 is curved so as to protrude upward in the vehicle up-down direction in a side view (so-called arch shape). Note that Fig. 2 shows a side view of the rear floor side member 20.

[0044] The rear floor side member 20 is formed by aluminum die casting, using a mold that opens along the vehicle width direction of the rear floor side member 20. In addition, the cross-sectional shape of the rear floor side member 20 when cut in the vehicle up-down direction and along the vehicle width direction forms a hat shape that opens on the outer side in the vehicle width direction.

[0045] That is, the rear floor side member 20, simply described, is composed of a rear wall portion (general portion) 40 which constitutes the main part of the rear floor side member 20, a pair of side wall portions 42, 44 which are erected from the outer edge of the rear wall portion 40 and arranged opposite each other, and flange portions 46, 48 which extend from the tips of the side wall portions 42, 44, respectively.

[0046] For ease of explanation, the rear floor side member 20 will be described divided into a front portion 50, a central portion 52, and a rear portion 54 along the vehicle longitudinal direction. In the rear floor side member 20 shown in Fig. 2, a straight line P shown along the vertical direction indicates the boundary between the front portion 50 and the central portion 52 of the rear floor side member 20, and a straight line Q indicates the boundary between the central portion 52 and the rear portion 54 of the rear floor side member 20. Hereinafter, the straight line P will be referred to as the "boundary line P" and the straight line Q will be referred to as the "boundary line Q."

[0047] Although not shown, so-called suspension member mounting portions 55, 57 to which suspension members are attached are provided at the front portion 50 and rear portion 54 of the rear floor side member 20, and center lines R, S shown at the front portion 50 and rear portion 54 respectively indicate the axial lines of the suspension member mounting portions 55, 57. Hereinafter, center line R will be referred to as the "axial line R" and center line S will be referred to as the "axial line S."

[0048] (Front part of rear floor side member) First, the front portion 50 of the rear floor side member 20 (hereinafter referred to as "rear floor side member front portion 50") will be described.

[0049] 1, a rear floor side member front portion (an end portion of a vehicle body structural member in the vehicle fore-and-aft direction) 50 is connected to a rocker 18 extending in the vehicle fore-and-aft direction at a vehicle side portion 16. The rocker 18 may be configured such that a rocker rear 19 is provided as a separate member at the rear portion in the vehicle fore-and-aft direction. Also, a connecting portion 21 that is connected to the rocker 18 may be provided separately at the rear floor side member front portion 50 of the rear floor side member 20.

[0050] 2, the rear floor side member front portion 50 includes a back wall portion 40A, side wall portions 42A, 44A, and flange portions 46A, 48A. An upper end 40A1 of the back wall portion 40A is formed with an inclined portion 41 that slopes in a gentle curve from the front end 50A to the rear end 50B of the rear floor side member front portion 50 toward the rear side in the vehicle front-rear direction and toward the upper side in the vehicle up-down direction.

[0051] On the other hand, the lower end 40A2 of the rear wall portion 40A has a different shape between the front portion 50C side and the rear portion 50D side in the vehicle front-rear direction of the rear floor side member front portion 50. Specifically, the front portion 50C side of the lower end 40A2 of the rear wall portion 40A is formed substantially parallel to the upper end 40A1 of the rear wall portion 40A, and has an inclined portion 43 that slopes in a gentle curve upward in the vehicle up-down direction as it approaches the rear side in the vehicle front-rear direction. In contrast, the rear portion 50D side of the lower end 40A2 of the rear wall portion 40A has a horizontal portion 45 that extends substantially horizontally toward the rear side in the vehicle front-rear direction.

[0052] Side wall portions 42A, 44A are formed from upper end 40A1 and lower end 40A2 of rear wall portion 40A toward the outside in the vehicle width direction along the shapes of upper end 40A1 and lower end 40A2. That is, side wall portion 42A is configured to include an inclined portion 41, and side wall portion 44A is configured to include an inclined portion 43 and a horizontal portion 45.

[0053] Furthermore, flange portion 46A extends upward in the vehicle vertical direction from the tip of side wall portion 42A along the shape of side wall portion 42A, and flange portion 48A extends downward in the vehicle vertical direction from the tip of side wall portion 44A along the shape of side wall portion 44A. Note that flange portion 46A is cut out on the front portion 50C side of rear floor side member front portion 50 (cutout portion 56). Furthermore, flange portion 48A extends rearward in the vehicle longitudinal direction and downward in the vehicle vertical direction at inclined portion 43 of side wall portion 44A.

[0054] (Center of rear floor side member) Next, the central portion 52 of the rear floor side member 20 (hereinafter referred to as "rear floor side member central portion 52") will be described.

[0055] 2, rear floor side member central portion 52 (the central portion of the vehicle body structural member in the vehicle front-rear direction) is configured to include a rear wall portion 40B, side wall portions 42B, 44B, and flange portions 46B, 48B. A curved portion 59 is formed at an upper end 40B1 of rear wall portion 40B, extending from a front end 52A to a rear end 52B of rear floor side member central portion 52, bulging upward in the vehicle up-down direction.

[0056] Meanwhile, a steeply inclined portion 58 that steeply inclines upward in the vehicle vertical direction as it approaches the rear side in the vehicle front-rear direction is formed at the lower end 40B2 of the rear wall portion 40B in the front portion 52C of the rear floor side-member central portion 52. Furthermore, a curved portion 60 is formed at the lower end 40B2 of the rear wall portion 40B from the steeply inclined portion 58 to the rear end 52B of the rear floor side-member central portion 52, and is formed substantially parallel to the upper end 40B1 of the rear wall portion 40B, bulging upward in the vehicle vertical direction.

[0057] Side wall portions 42B, 44B are formed from upper end 40B1 and lower end 40B2 of rear wall portion 40B toward the outside in the vehicle width direction along the shapes of upper end 40B1 and lower end 40B2. That is, side wall portion 42B is configured to include a curved portion 59, and side wall portion 44B is configured to include a steeply inclined portion 58 and a curved portion 60.

[0058] Furthermore, the flange portion 46B extends upward in the vehicle vertical direction from the tip of the side wall portion 42B along the shape of the side wall portion 42B, and the flange portion 48B extends downward in the vehicle vertical direction from the tip of the side wall portion 44B along the shape of the side wall portion 44B. Note that, at the steep slope portion 58 of the side wall portion 44B, the flange portion 48B extends rearward in the vehicle front-rear direction and downward in the vehicle vertical direction.

[0059] (Rear part of rear floor side member) Next, the rear portion 54 of the rear floor side member 20 (hereinafter referred to as "rear floor side member rear portion 54") will be described.

[0060] As shown in Fig. 1, the rear floor side member rear portion (the end portion in the vehicle front-rear direction of the vehicle body structural member) 54 is connected to the rear floor side member barrier 38 extending in the vehicle front-rear direction at the vehicle rear portion 14. As shown in Fig. 2, the rear floor side member rear portion 54 is configured to include a rear wall portion 40C, side wall portions 42C, 44C, and flange portions 46C, 48C. A curved portion 61 that bulges slightly downward in the vehicle up-down direction is formed at the upper end 40C1 of the rear wall portion 40C from the front end 54A to the rear end 54B of the rear floor side member rear portion 54.

[0061] Meanwhile, an inclined portion 62 is formed at the lower end 40C2 of the rear wall portion 40C, which is inclined downward in the vehicle up-down direction as it approaches the rear side in the vehicle front-to-rear direction, at the front portion 54C of the rear floor side member rear portion 54. Furthermore, a horizontal portion 63 is formed at the lower end 40C2 of the rear wall portion 40C, which is in the rear portion 54D of the rear floor side member rear portion 54, and which extends substantially horizontally toward the rear side in the vehicle front-to-rear direction.

[0062] From the upper end 40C1 and the lower end 40C2 of the rear wall portion 40C, side wall portions 42C and 44C are respectively formed toward the outside in the vehicle width direction along the shapes of the upper end 40C1 and the lower end 40C2. That is, the side wall portion 42C is configured to include a curved portion 61, and the side wall portion 44C is configured to include an inclined portion 62 and a horizontal portion 63. In addition, the flange portion 46C extends from the tip of the side wall portion 42C toward the upper side in the vehicle up-down direction along the shape of the side wall portion 42C, and the flange portion 48C extends from the tip of the side wall portion 44C toward the lower side in the vehicle up-down direction along the shape of the side wall portion 44C.

[0063] <Main parts of rear floor side member> In this embodiment, as shown in Fig. 2, the rear wall 40 is provided with plate-shaped vertical ribs 66, vertical ribs (cross ribs) 78, vertical ribs 86, etc. formed along the vehicle up-down direction, and plate-shaped horizontal ribs (first horizontal rib, rib) 68, horizontal ribs (rib) 80, horizontal ribs (second horizontal rib, rib) 92, etc. formed along the vehicle front-rear direction, so as to bridge between the side wall 42 and the side wall 44, and are generally perpendicular to each other. (First vertical rib) 66, Vertical rib (first vertical rib) 70 , Vertical ribs 78, Vertical rib (second vertical rib) 86 、88 The thicknesses of the vertical ribs 66, 78, 86 and the horizontal ribs 68, 80, 92, etc. are set to be approximately the same. The vertical ribs 66, 78, 86 and the horizontal ribs 68, 80, 92, etc. will be described in detail below.

[0064] (Front part of rear floor side member) First, the rear floor side member front portion 50 (the region from the front end 50A of the rear floor side member front portion 50 to the front end 52A (boundary line P) of the rear floor side member central portion 52) will be described.

[0065] The rear floor side member front portion 50 is provided with a plurality of vertical ribs 66. The vertical ribs 66 are bridged between the side wall portion 42A of the rear floor side member front portion 50 and the horizontal portion 45 of the side wall portion 44A. Here, the vertical rib 66A located at the center of the plurality of vertical ribs 66 is provided at a position overlapping with the axis line R of the suspension member mounting portion 55 described above in a side view of the vehicle. In addition, a vertical rib 70 is provided on the inclined portion 43 side of the side wall portion 44A, and the vertical rib 70 is bridged between the side wall portion 42A and a horizontal rib 72 described later.

[0066] Further, in the rear floor side member front portion 50, a plurality of horizontal ribs (ribs) 68 are provided so as to be substantially perpendicular to the above-mentioned plurality of vertical ribs 66. The horizontal ribs 68 are formed along the vehicle front-rear direction from the rear floor side member front portion 50 to the front portion 52C of the rear floor side member central portion 52, and bridge between the side wall portion 42A of the rear floor side member front portion 50 and the side wall portion 44B of the rear floor side member central portion 52.

[0067] In addition, in the front portion 50C of the rear floor side member front portion 50, inclined ribs 74, 76 are formed between the side wall portion 42A and the side wall portion 44A and arranged so as to be approximately parallel to the side wall portions 42A, 44A, the inclined rib 74 is connected to the vertical rib 70 and the horizontal rib 72, and the inclined rib 76 is connected to the horizontal rib 72.

[0068] (Center of rear floor side member) Next, the rear floor side member central portion 52 (the region from the front end 52A (boundary line P) of the rear floor side member central portion 52 to the front end 54A (boundary line Q) of the rear floor side member rear portion 54) shown in FIG. 2 will be described.

[0069] The rear floor side member central portion 52 is provided with a plurality of vertical ribs 78. The vertical ribs 78 are provided at a predetermined interval in the vehicle front-rear direction near the top Z of the rear floor side member central portion 52. The vertical ribs 78 are bridged between the side wall portion 42B and the side wall portion 44B of the rear floor side member central portion 52, and extend from approximately the center of curvature of the curved portion 60 of the side wall portion 44B to Radial The respective portions are arranged so as to extend in the direction perpendicular to the axis of the arrow.

[0070] A plurality of horizontal ribs 80 are bridged in the vehicle front-rear direction between a vertical rib 78A located at the front and a vertical rib 78B located at the rear of the plurality of vertical ribs 78. A vertical rib 78C is provided in front of the vertical rib 78A, and the vertical rib 78C is bridged between the side wall portion 42B and the side wall portion 44B.

[0071] An inclined rib 82 is connected to the side wall portion 42B between the vertical rib 78C and the vertical rib 78A, and inclines downward in the vehicle up-down direction as it approaches the rear side in the vehicle front-rear direction. The inclined rib 82 is also connected to the side wall portion 42B and a horizontal rib (rib) 80A described later.

[0072] On the other hand, among the lateral ribs 80, the lateral rib 80A located at the center of the rear floor side member central portion 52 in the vehicle up-down direction extends beyond the vertical rib 78B to the side wall portion 42B. The lateral rib 80B located below the lateral rib 80A extends from the side wall portion 42A to the side wall portion 42B, including the side wall portion 42C of the rear floor side member rear portion 54 described below. An inclined rib 84 that is also connected to the vertical rib 78B and inclined downward in the vehicle up-down direction as it approaches the rear side in the vehicle fore-and-aft direction is bridged between the lateral rib 80A and the lateral rib 80B.

[0073] (Rear part of rear floor side member) Next, the rear floor side member rear portion 54 (the region from the front end 52A (boundary line P) of the rear floor side member central portion 52 to the front end 54A to the rear end 54B of the rear floor side member rear portion 54) shown in FIG. 2 will be described.

[0074] A vertical rib 86 is provided on the rear floor side member rear portion 54. This vertical rib 86 is bridged between the side wall portion 42C and the side wall portion 44C of the rear floor side member rear portion 54. Here, the vertical rib 86 is provided at a position overlapping with the axis line S of the suspension member mounting portion 57 described above in a side view of the vehicle. Furthermore, vertical ribs 88, 90 are provided on the front side and rear direction of the vertical rib 86, respectively. The vertical rib 88 is bridged between the side wall portion 42C and a horizontal rib (rib) 92A described later, and the vertical rib 90 is bridged between the side wall portion 42C and a horizontal rib (rib) 91 described later.

[0075] In addition, in the rear floor side member rear portion 54, horizontal ribs 80B, 92, 92A are provided so as to be approximately perpendicular to the above-mentioned multiple vertical ribs 86, 88, 90. The horizontal rib 80B is formed from the front portion 54C of the rear floor side member rear portion 54 to the rear portion 52D of the rear floor side member central portion 52, and is bridged between the side wall portion 44B of the rear floor side member central portion 52 and the side wall portion 42C of the rear floor side member rear portion 54. In addition, the horizontal rib 92 is formed so as to connect the side wall portion 44C and the vertical ribs 86, 88, 90, and the horizontal rib 92A is formed so as to connect the side wall portion 44C and the vertical ribs 86, 88.

[0076] Here, Fig. 3 shows a side view of the rear floor side member 20. As shown in Fig. 3, in the rear floor side member front portion 50, a cross section cut along a direction intersecting the vehicle front-rear direction of the rear floor side member 20 (vehicle up-down direction and vehicle width direction), that is, a centroid of a cross section at a predetermined position X1 along the vehicle front-rear direction of the rear floor side member 20 is indicated by O1. In addition, in the rear floor side member central portion 52, a centroid of a cross section at a predetermined position X2 along the vehicle front-rear direction is indicated by O2. Furthermore, in the rear floor side member rear portion 54, a centroid of a cross section at a predetermined position X3 along the vehicle front-rear direction is indicated by O3.

[0077] In this embodiment, in the rear floor side member front portion 50, the transverse rib 68 is disposed above the centroid O1 of the cross section at the predetermined position X1 in the vehicle vertical direction (region A). In the rear floor side member central portion 52, the transverse rib 80A is disposed below the centroid O2 of the cross section at the predetermined position X2 in the vehicle vertical direction (region B). Furthermore, in the rear floor side member rear portion 54, the transverse ribs 80B, 92 are disposed above the centroid O3 of the cross section at the predetermined position X3 in the vehicle vertical direction (region C).

[0078] In this embodiment, as described above, the rear floor side member 20 is formed by aluminum die casting, and the mold (not shown) for molding the rear floor side member 20 is configured to open along the vehicle width direction of the rear floor side member 20.

[0079] The rear floor side member 20 is molded by the die, and in order to release the rear floor side member 20 from the die when the die is opened, an ejection pin (not shown) is provided on the fixed die side that constitutes part of the die. This ejection pin comes into contact with the rear floor side member 20 and presses the rear floor side member 20, thereby releasing the rear floor side member 20 from the fixed die.

[0080] For this reason, a push-out pin seat against which the push-out pin abuts is provided on the rear floor side member 20. More specifically, in this embodiment, a plurality of cylindrical push-out pin seats 93, 94, 96 are erected from the rear wall portion 40 of the rear floor side member 20. The diameters of the push-out pin seats 93, 94, 96 are set to be thicker than the plate thicknesses of the vertical ribs 66, 78, the horizontal ribs 68, 80, etc.

[0081] The ejector pin seat 93 is provided at the intersection of at least the vertical ribs 66A, 86 and the side wall portion 42, and at the intersection of the other vertical ribs 66, 78 or the horizontal ribs 68, 80, 92 and the side wall portion 42, and the ejector pin seat 93 and the side wall portion 42 are integrally formed.

[0082] Further, the ejector pin seat 94 is provided at the intersection of at least the vertical ribs 66A, 86 and the side wall portion 44, and at the intersection of the other vertical ribs 66, 78 or the horizontal ribs 68, 72, 92 and the side wall portion 44, and the ejector pin seat 94 and the side wall portion 44 are integrally formed.

[0083] Furthermore, the ejector pin seats 96 are provided at some of the intersections where the vertical ribs 66, 70 and the horizontal ribs 68 intersect, and at some of the intersections where the vertical ribs 78 and the horizontal ribs 80 intersect, etc.

[0084] As described above, ejector pin seat 93 is formed integrally with side wall portion 42, and ejector pin seat 94 is formed integrally with side wall portion 44, so that ejector pin seats 93, 94 are thicker than ejector pin seat 96.

[0085] [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.

[0086] In this embodiment, the rear floor side member 20 shown in Fig. 2 is made of aluminum die-cast. Generally, die-cast members have a high degree of design freedom, so they are formed to have a thicker wall in some places to obtain high rigidity, but making the wall thicker increases the vehicle weight.

[0087] For this reason, in this embodiment, vertical ribs 66, 78, 86, etc. formed along the vehicle up-down direction and horizontal ribs 68, 80, 92, etc. formed along the vehicle fore-aft direction are provided between the opposing side wall portions 42 and 44 in the rear floor side member 20, thereby reinforcing the rear floor side member 20 with the minimum necessary thickness.

[0088] As a result, in this embodiment, the rigidity of the rear floor side member 20 itself is improved, and when a collision load is input to the rear floor side member 20 in the fore-and-aft direction of the vehicle, bending deformation in the rear floor side member 20 can be suppressed.

[0089] In this embodiment, the horizontal ribs 68, 80, 92, etc. are formed along the input direction of the collision load (vehicle front-rear direction). As a comparative example, for example, as shown in Fig. 5, a case will be considered in which a rib 202 is formed along a direction intersecting the input direction of the collision load F' (vehicle front-rear direction) in an arch-shaped rear floor side member 200. When the collision load F' is input to the rear floor side member 200 and a bending moment M is generated in the rear floor side member 200, the rear floor side member 200 is bent and deformed, and there is a possibility that the collision energy is not sufficiently absorbed. Note that Fig. 5 is a schematic diagram showing a side view of the rear floor side member 200.

[0090] In contrast, as shown in Figures 3 and 4, in this embodiment, as described above, in the arch-shaped rear floor side member 20, the horizontal ribs 68, 80, 92, etc. erected from the rear wall portion 40 of the rear floor side member 20 are formed along the input direction of the collision load F (the fore-and-aft direction of the vehicle).

[0091] Here, the uppermost lateral rib (rib) 68A of the lateral ribs 68 is bridged between the side wall portion 42A of the rear floor side member front portion 50 and the side wall portion 44B of the rear floor side member central portion 52. In addition, the central lateral rib (rib) 80B of the lateral ribs 80 is bridged between the side wall portion 44B of the rear floor side member central portion 52 and the side wall portion 42C of the rear floor side member rear portion 54.

[0092] Therefore, when a collision load F is input to the rear floor side member 20 in the vehicle front-rear direction, the collision load F is transmitted from the side wall portion 42C of the rear floor side member rear portion 54 to the side wall portion 44B via the horizontal rib 80B, and then transmitted via the side wall portion 44B to the side wall portion 44A via the horizontal rib 68A. Also, at this time, the collision load F is transmitted to the side wall portion 44C by the other horizontal ribs 92, 92A provided on the rear floor side member rear portion 54, and then transmitted via the side wall portion 44B to the side wall portion 44A via the horizontal rib 68.

[0093] In other words, since the transverse ribs 68, 80, 92, etc. are formed along the input direction of the collision load F, when the collision load F is input to the rear floor side member 20, the collision load F is transmitted along the transverse ribs 68, 80, 92, etc. (strictly speaking, the order is transverse rib 92, transverse rib 80, transverse rib 68), and the transverse ribs 68, 80, 92, etc. are capable of axial compression.

[0094] In this way, when the transverse ribs 68, 80, 92, etc. are axially compressed, the transverse ribs 68, 80, 92, etc. are deformed (elastic deformation and plastic deformation) during the axial compression process, and the collision energy is effectively absorbed. This makes it possible to absorb a larger collision energy with a given stroke. On the other hand, it becomes possible to absorb collision energy with a short stroke, and even aluminum die-cast, which has less ductility than steel plate, does not crack. Note that FIG. 4 is a schematic diagram showing a side view of the rear floor side member 20 shown in FIG. 2.

[0095] In this embodiment, side walls 42, 44 are further provided that stand upright from the outer edge of the rear wall 40 of the rear floor side member 20 and connect to the horizontal rib 68. This further reinforces the rear floor side member 20, improving the rigidity of the rear floor side member 20 itself. However, the side walls 42, 44 are not necessarily required.

[0096] Furthermore, in this embodiment, the lateral ribs 68A, 80B and the side wall portion 44 are formed continuously along the vehicle front-rear direction, so that the lateral ribs 68A, the side wall portion 44 and the lateral rib 80B are integrated in the vehicle front-rear direction to form a part of the load transmitting member.

[0097] In this way, the lateral rib 68A, the side wall portion 44, and the lateral rib 80B are continuously formed along the vehicle front-rear direction, so that the side wall portion 44 can be used as part of the lateral ribs 68A, 80B. As a result, although not shown, compared to a case in which a rib is formed separately from the side wall portion 44, it is not necessary to form a new rib, and therefore it is possible to reduce the weight of the rear floor side member 20.

[0098] Furthermore, there are no problems with forging due to the provision of new ribs, such as the problem of securing a cooling space on the die side, or the problem of molten metal running on the rear floor side member 20 side. Depending on the shape of the rear floor side member 20, the horizontal ribs 68A, 80B and the side wall portion 44 do not necessarily need to be formed continuously along the vehicle fore-and-aft direction.

[0099] 3, in this embodiment, on the rear floor side member front portion 50 side of the rear floor side member 20, the transverse rib 68A is disposed above the centroid O1 of the cross section at a predetermined position X1 along the vehicle longitudinal direction (region A). Also, on the rear floor side member central portion 52, the transverse rib 80A is disposed below the centroid O2 of the cross section at a predetermined position X2 along the vehicle longitudinal direction (region B). Furthermore, on the rear floor side member rear portion 54 side, the transverse rib 80B is disposed above the centroid O3 of the cross section at a predetermined position X3 along the vehicle longitudinal direction (region C).

[0100] The rear floor side member 20 is formed in an arch shape that curves along the vehicle up-down direction. In other words, the rear floor side member front portion 50 and the rear floor side member rear portion 54 of the rear floor side member 20 are disposed lower in the vehicle up-down direction than the rear floor side member central portion 52.

[0101] For this reason, as described above, on the rear floor side member front portion 50 side of the rear floor side member 20, the transverse rib 68A is disposed above the centroid O1 of the cross section at a predetermined position X1 along the vehicle longitudinal direction, and on the rear floor side member rear portion 54 side, the transverse rib 80B is disposed above the centroid O3 of the cross section at a predetermined position X3 along the vehicle longitudinal direction. On the other hand, on the rear floor side member central portion 52, the transverse rib 80A is disposed below the centroid O2 of the cross section at a predetermined position X2 along the vehicle longitudinal direction.

[0102] That is, in this embodiment, in the rear floor side member 20 formed in an arch shape curved along the vehicle up-down direction, the vehicle up-down direction height positions of the lateral ribs 68A, 80B, 80A are adjusted at the rear floor side member front portion 50, the rear floor side member rear portion 54, and the rear floor side member central portion 52 of the rear floor side member 20. This makes it possible to make the vehicle up-down direction height positions of the centroids O1, O1, O3 in each cross section of the rear floor side member 20 in the vehicle fore-aft direction approximately constant.

[0103] This makes it possible to suppress the occurrence of bending moment during a rear collision of the vehicle, and also to increase the load transmission efficiency via the transverse ribs 68A, 80A, and 80B. Of course, ribs may be formed in areas other than the areas A, B, and C.

[0104] (Supplementary information regarding this embodiment) In this embodiment, the rear floor side member 20 is formed by die-casting aluminum, but it is not limited to aluminum, and may be a die-cast product made of an alloy of zinc, magnesium, copper, etc., or may be formed by casting. Furthermore, the rear floor side member 20 may be molded from fiber reinforced plastic (FRP).

[0105] In addition, in this embodiment, the rear floor side member 20 is arch-shaped and curved along the vertical direction of the vehicle, but it may also be formed into an arch shape curved along the width direction of the vehicle, and furthermore, it does not necessarily have to be arch-shaped.

[0106] Furthermore, in this embodiment, the rear floor side member 20 has been described, but the present invention is not limited thereto. For example, as shown in Fig. 6, the present invention may be applied to a front side member barrier 106 that connects a front side member 102 arranged along the vehicle front-rear direction at the vehicle body front portion 100 side and a floor under reinforcement 104 arranged along the vehicle front-rear direction at the rear side of the front side member 102 in the vehicle front-rear direction. By forming a rib 106A along the vehicle front-rear direction in the front side member barrier 106, it is possible to suppress the occurrence of bending moment in the event of a frontal collision of the vehicle, and to increase the load transmission efficiency via the rib 106A.

[0107] Furthermore, the present invention may be applied to any vehicle body structural member other than the above, and may therefore be applied to a tunnel portion or floor cross member 28 (see FIG. 1) other than the side member.

[0108] An example of an embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0109] 10 Vehicles 20 Rear floor side member (body structural member) 28 Floor cross member (body structural member) 40 Back wall section (general section) 42 Side wall 44 Side wall 50 Front part of rear floor side member (end part of body structural member in the vehicle longitudinal direction) 52 Center of rear floor side member (center of body structural member in the vehicle longitudinal direction) 54 Rear floor side member rear part (end part of body structural member in the vehicle longitudinal direction) 68 Horizontal rib (rib) 68A Horizontal rib (rib) 72 Horizontal rib (rib) 80 Horizontal rib (rib) 80A Horizontal rib (rib) 80B Horizontal rib (rib) 91 Horizontal rib (rib) 92 Horizontal rib (rib) 92A Horizontal rib (rib) 106 Front side member barrier (body structural member) 106A Rib O1 centroid O2 centroid O3 centroid

Claims

1. A vehicle body structural member formed by a die, A general part constituting a main part of the vehicle body structural member; A rib is provided upright from the general portion and formed along an input direction of a collision load; The present invention relates to a method for manufacturing a computer-implemented ... The vehicle body structural member extends along a vehicle front-rear direction, and is curved along a vehicle up-down direction or a vehicle width direction to form an arch shape, and a pair of side wall portions are erected from an outer edge of the general portion and formed at both ends in a width direction substantially perpendicular to the extending direction of the vehicle body structural member; a cross rib extending radially from an approximate center of curvature of a curved portion curved in an arch shape at an approximate center in the vehicle front-rear direction of the vehicle body structural member, spanning between the pair of side wall portions, and crossing the rib; a thick portion provided at a connecting portion where only one of the cross ribs is connected to a side wall portion of the pair of side wall portions that is approximately on the side of the curvature center of the curved portion, and formed to be thicker than a plate thickness of the rib; A vehicle body structural member further comprising:

2. A vehicle body structural member formed by a die, The vehicle body structural member has a convex shape that protrudes upward in a vehicle up-down direction at a substantially central portion in an extension direction, A general part constituting a main part of the vehicle body structural member; A rib is provided upright from the general portion and formed along an input direction of a collision load; a pair of side wall portions formed on both ends in a width direction substantially perpendicular to an extension direction of the vehicle body structural member, the side wall portions being erected from an outer edge of the general portion; a cross rib located below the approximately central portion from one of the side wall portions toward the other of the side wall portions, extending radially from an approximate center of curvature of a curved portion of the convex shape and crossing the rib; a thick portion provided at a connecting portion where only one of the cross ribs is connected to a side wall portion of the pair of side wall portions that is located on the lower side in the vehicle up-down direction, and formed to be thicker than a plate thickness of the rib; A vehicle body structural member comprising:

3. 3. The vehicle body structural member according to claim 1, wherein adjacent ones of the cross ribs are not in contact with each other at their connecting portions with the side wall portions.

4. The vehicle body structural member according to claim 2 , wherein the vehicle body structural member is curved in a vertical direction or a width direction of the vehicle to have an arch shape.

5. 5. The vehicle body structural member according to claim 1, wherein the rib includes a transverse rib formed along a vehicle front-rear direction.

6. The vehicle body structural member according to any one of claims 1 to 5, wherein the rib is connected to at least one of the pair of side wall portions.

7. The vehicle body structural member according to any one of claims 1 to 6, wherein the rib and at least one of the pair of side wall portions are connected by a thick portion that is formed to be thicker than a plate thickness of the rib.

8. The vehicle body structural member according to any one of claims 1 to 7, wherein the pair of side wall portions are arranged above and below in the vehicle vertical direction, and the rib and the lower one of the pair of side wall portions are connected by a thick portion formed to be thicker than the plate thickness of the rib.

9. A vehicle body structural member according to any one of claims 1 to 8, wherein the arch-shaped inner side wall portion is formed in approximately the center of the vehicle in the fore-and-aft direction of the vehicle body structural member, and is continuous along the vehicle fore-and-aft direction with a transverse rib formed in at least one of the front and rear portions of the vehicle in the fore-and-aft direction of the vehicle body structural member and extending along the vehicle fore-and-aft direction.

10. A vehicle body structural member as described in any one of claims 1 to 9, wherein a transverse rib formed along the vehicle fore-and-aft direction at a front portion of the vehicle body structural member in the vehicle fore-and-aft direction is a first transverse rib spanning between the pair of side wall portions.

11. A vehicle body structural member as described in any one of claims 1 to 10, wherein a transverse rib formed along the vehicle fore-and-aft direction at the rear of the vehicle body structural member in the vehicle fore-and-aft direction is a second transverse rib spanning between the pair of side wall portions.

12. The vehicle body structural member is disposed along a front-rear direction of the vehicle and is formed in an arch shape curved along a vertical direction of the vehicle, The vehicle body structural member according to any one of claims 1 to 11, wherein the rib is arranged at both ends of the vehicle structural member in the vehicle fore-and-aft direction above the vehicle vertical height position of the centroid in a cross section cut along a direction intersecting the vehicle fore-and-aft direction of the vehicle body structural member, and is arranged at a center of the vehicle fore-and-aft direction of the vehicle body structural member below the vehicle vertical height position of the centroid in a cross section cut along a direction intersecting the vehicle fore-and-aft direction of the vehicle body structural member.

13. A vehicle body structural member according to any one of claims 1 to 12, wherein a first vertical rib is provided at a front portion of the vehicle in the fore-and-aft direction, the first vertical rib being formed along the vehicle up-down direction and spanning between the pair of side wall portions.

14. The vehicle body structural member is provided at a rear portion in a vehicle front-rear direction and is formed along a vehicle up-down direction. The vehicle body structural member according to any one of claims 1 to 13, further comprising a second vertical rib extending across the pair of side wall portions.

Images