Vehicle body structural components

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 Art]

[0002] Patent Document 1 discloses a technology related to a vehicle body structure in which a front side member and a floor member are connected via a member formed by aluminum die casting and constituting a closed cross-section portion (hereinafter referred to as "vehicle body structural member"). In the above prior art, ribs are formed in a truss shape in the closed cross-section portion of the vehicle body structural member to improve rigidity. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2001-030961 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in the above prior art, when a collision load is input to the vehicle body structural member along the vehicle front-rear direction, the closed cross-section portion may undergo large bending deformation due to the generation of bending moment.

[0005] An object of the present invention, in consideration of the above facts, 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 described in claim 1 is a vehicle body structural member molded by a mold, comprising: a general portion constituting a main part of the vehicle body structural member; and a member erected from the general portion done rib, and Preparation , the vehicle body structural member is disposed along the vehicle front-rear direction, and the vehicle front-rear direction of the vehicle body structural member is From the rear side of the front section to the front side of the central section, at the lower end of the general section. downward in the vehicle vertical direction To the sideA protruding part is formed, The aforementioned protrusion is composed of a horizontal portion provided at the lower end of the protrusion in the vehicle's vertical direction and extending substantially horizontally, a steeply sloped portion provided on the rear side of the horizontal portion in the vehicle's longitudinal direction and rapidly sloping upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction, and a grid portion formed by the intersection of vertical ribs formed along the vehicle's vertical direction and horizontal ribs formed along the vehicle's longitudinal direction, wherein the ribs constituting the grid portion consist only of the vertical ribs and the horizontal ribs. .

[0007] The vehicle body structural member according to claim 1 is formed by a mold. Ribs are erected from the general part that constitutes the main part of the vehicle body structural member, and these ribs are formed in line with the direction of transmission of the collision load.

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

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

[0010] In contrast, in the present invention, the rib is Established from the general section Therefore, collision loads are applied to the vehicle body structural members. If , the collision load Gari It is transmitted along the line Then The rib is designed to be axially compressible. When the rib is axially compressed in this way, the impact energy is effectively absorbed by the deformation of the rib (elastic and plastic deformation). On the other hand, in the present invention, the vehicle body structural member is arranged along the longitudinal direction of the vehicle, and the front part of the vehicle body structural member in the longitudinal direction of the vehicle From the rear side to the front side of the central part, at the lower end of the general part Downward in the vertical direction of the vehicle To the side A protruding convex portion is formed. It is. This protrusion is composed of a horizontal section, a steeply sloped section, and a grid section. The horizontal section is located at the lower end of the protrusion in the vehicle's vertical direction and extends substantially horizontally. The steeply sloped section is located on the rear side of the horizontal section in the vehicle's longitudinal direction and slopes sharply upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction. Furthermore, the lattice section is formed by intersecting vertical ribs and horizontal ribs, which are erected from the general section and run along the vehicle's vertical direction. The ribs constituting the lattice section consist only of vertical and horizontal ribs. . The vehicle body structural member according to the present invention as set forth in claim 2 is a vehicle body structural member molded by a mold and extending along the vehicle front-rear direction, comprising: a general portion that constitutes a main part of the vehicle body structural member; the rib erected from the general portion done ; and a pair of side wall portions erected from an outer edge of the general portion and formed at both ends in a direction substantially orthogonal to the extending direction of the vehicle body structural member top and bottom , wherein Preparation , in the vehicle body structural member, a vertical rib protruding downward in the vehicle vertical direction in the vehicle front-rear direction From the rear side of the front section to the front side of the central section, at the lower end of the general section. downward in the vehicle vertical direction To the side protruding A protrusion is formed, and the protrusion is provided at the lower end of the protrusion in the vehicle's vertical direction and has a horizontal section that extends substantially horizontally, and a steep section provided on the rear side of the horizontal section in the vehicle's longitudinal direction and slopes sharply upward in the vehicle's vertical direction as it moves towards the rear side in the vehicle's longitudinal direction, and of the ribs, formed along the vehicle vertical direction Ta and the vertical rib 、 and a horizontal rib formed along the vehicle front-rear direction Toga are formed to intersect each other to form , connecting the pair of side wall sections a cross-shaped rib The system is composed of the above, and the ribs constituting the cross-shaped rib consist only of the longitudinal rib and the transverse rib. . In the vehicle body structural member according to the present invention as set forth in claim 2, the vehicle body structural member molded by a mold and extending along the vehicle front-rear direction includes a general portion, a rib and and a pair of side walls department . The general portion constitutes a main part of the vehicle body structural member, and the rib is erected from the general portion and . Further, the pair of side wall portions are erected from the outer edge of the general portion, and are formed at both ends in the direction substantially orthogonal to the extending direction of the vehicle body structural member top and bottom at both ends in said direction. Furthermore, in the vehicle body structural member, a protrusion is formed at the lower end of the general section, extending downward in the vehicle's vertical direction, from the rear of the front section in the vehicle's longitudinal direction to the front of the central section. This protrusion is composed of a horizontal section, a steeply sloped section, and a cross-shaped rib. The horizontal section is located at the lower end of the protrusion in the vehicle's vertical direction and extends substantially horizontally. The steeply sloped section is located on the rear side of the horizontal section in the vehicle's longitudinal direction and slopes sharply upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction. Furthermore, the cross-shaped ribs are formed by intersecting vertical ribs and horizontal ribs, which are erected from the general section and run along the vehicle's vertical direction. The ribs constituting the cross-shaped ribs consist only of vertical and horizontal ribs. . The vehicle body structural member according to the present invention as set forth in claim 3 is a vehicle body structural member molded by a mold and extending along the vehicle front-rear direction, comprising: a general portion that constitutes a main part of the vehicle body structural member; the rib erected from the general portion done ; and a pair of side wall portions erected from an outer edge of the general portion and formed at both ends in a direction substantially orthogonal to the extending direction of the vehicle body structural member top and bottom direction's both ends formed with the pair of side wall portions, and Preparation , in the vehicle body structural member, a connecting rib protruding downward in the vehicle vertical direction in the vehicle front-rear direction From the rear side of the front section to the front side of the central section, at the lower end of the general section. downward in the vehicle vertical direction To the side protruding A protrusion is formed, and the protrusion is provided at the lower end of the protrusion in the vehicle's vertical direction and has a horizontal section extending substantially horizontally, a steep section provided on the rear side of the horizontal section in the vehicle's longitudinal direction and slopes sharply upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction, a top section which is the part where the horizontal section and the steep section intersect, and of the ribs, connecting the pair of side wall portions First is the connecting rib The structure is composed of the above, and the lower end of the front part of the vehicle in the longitudinal direction of the vehicle body structure member is formed to extend downward in the vertical direction of the vehicle as it moves forward in the longitudinal direction of the vehicle, and the top part is at the front end of the vehicle in the longitudinal direction of the vehicle body structure member formed on an upper side in the vehicle vertical direction relative to a lower end doing . In the vehicle body structural member according to the present invention as set forth in claim 3, the vehicle body structural member molded by a mold and extending along the vehicle front-rear direction includes a general portion, a rib and and a pair of side walls department to constitute the structure. The general portion constitutes a main portion of the vehicle body structural member, and the rib is erected from the general portion and . Further, the pair of side wall portions are erected from an outer edge of the general portion, and are formed at both end portions in a direction substantially orthogonal to the extending direction of the vehicle body structural member top and bottom . Furthermore, in the vehicle body structural member, a protrusion is formed at the lower end of the general section, extending downward in the vehicle's vertical direction, from the rear of the front section in the vehicle's longitudinal direction to the front of the central section. This protrusion is composed of a horizontal section, a steep section, a top section, and a first connecting rib. The horizontal section is located at the lower end of the protrusion in the vehicle's vertical direction and extends substantially horizontally. The steep section is located on the rear side of the horizontal section in the vehicle's longitudinal direction and slopes sharply upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction. Furthermore, the top portion is the point where the horizontal portion and the steeply sloped portion intersect, and the first connecting rib connects a pair of side wall portions of the ribs erected from the general portion. The lower end of the front portion of the vehicle body structural member in the longitudinal direction of the vehicle extends downward in the vertical direction of the vehicle as it moves forward in the longitudinal direction of the vehicle, and the top portion is formed above the lower end of the front portion of the vehicle body structural member in the longitudinal direction of the vehicle in the vertical direction of the vehicle. The vehicle body structural member according to the present invention as set forth in claim 4 is the vehicle body structural member as set forth in claim 1, further comprising a pair of side wall portions erected from an outer edge of the general portion and formed at both end portions in a direction substantially orthogonal to the extending direction of the vehicle body structural member top and bottom . The 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 claim 2 or claim 4 , wherein Of the pair of side wall portions, this refers to the portion where the horizontal portion and the steeply sloped portion of the protrusion intersect. the side wall portion provided on a vehicle rear side relative to a top portion On the other hand side wall portion And, of the ribs, the second one is connected to the one side wall portion. and a connecting rib, wherein the 2nd connecting rib and the On the other hand side wall portion are connected via a thick-walled portion formed to be thicker than a plate thickness of the connecting rib 2nd . The vehicle body structural member according to claim 6 is the vehicle body structural member according to claim 3, wherein the first connecting rib that connects to one of the pair of side wall portions, which is located on the rearward side of the vehicle from the top portion, and the one side wall portion are connected via a thickened portion that is thicker than the plate thickness of the first connecting rib.

[0011] Claim 7 The vehicle body structural member according to the present invention as set forth in any one of claims 1 to 6 , wherein the vehicle body structural member is curved along the vehicle vertical direction or curved along the vehicle width direction to be formed in an arch shape.

[0012] Claim7 In the vehicle body structural member according to the present invention as described above, the vehicle body structural member is curved along the vertical direction of the vehicle or curved along the width direction of the vehicle to form an arch shape.

[0013] Therefore, when a collision load is applied to a vehicle body structural member along the longitudinal direction of the vehicle due to a frontal collision (hereinafter referred to as "vehicle front impact") or a rear collision (hereinafter referred to as "vehicle rear impact"), a bending moment is generated in the vehicle body structural member because it is formed in a so-called arch shape.

[0014] Therefore, in an arched vehicle body structural member, ribs extending from the general part of the vehicle body structural member are formed along the direction of input of the collision load (vehicle longitudinal direction), thereby suppressing the generation of bending moments and reducing bending deformation of the vehicle body structural member when a collision load is applied.

[0015] Claim 8 The vehicle body structural member according to the present invention described in claim 3 or claim 5 In the vehicle body structural member according to the present invention as described above, the rib is configured to include a transverse rib formed along the longitudinal direction of the vehicle.

[0016] Claim 8 In the vehicle body structural member according to the present invention as described above, the ribs are configured to include transverse ribs formed along the longitudinal direction of the vehicle. Therefore, when a collision load is applied to the vehicle body structural member along the longitudinal direction of the vehicle due to a frontal or rearward collision of the vehicle, the collision load is transmitted along the ribs, and the ribs are made axially compressible. In this way, the axial compression of the ribs makes it possible to effectively absorb collision energy.

[0017] Claim 9 The vehicle body structural member according to the present invention described in claim 8 In the vehicle body structural member described, the vehicle body structural member is The transverse rib is connected to at least one of the pair of side walls. .

[0018] Claim 9 In the vehicle body structural member according to the present invention described above, the outer edge of the general part is erected At least one of the pair of sidewalls is connected to the transverse rib. This further reinforces the vehicle body structural members, thereby further improving the rigidity of the vehicle body structural members themselves.

[0019] Claim 10 The vehicle body structural member according to the present invention described in claim 9 In the vehicle body structural member described above, beside Ribs and the above At least one The side walls are formed continuously along the front-to-rear direction of the vehicle.

[0020] Claim 10 In the vehicle body structural member according to the present invention described above, beside Ribs and At least one The side wall portion is formed continuously along the front-rear direction of the vehicle, and beside The ribs are integrated in the longitudinal direction of the vehicle and become part of the load transmission member. beside The ribs and side walls are formed continuously along the longitudinal direction of the vehicle, so that the side walls are beside It can be used as part of the rib. This allows it to be used separately from the side wall. beside Compared to when ribs are formed, new beside Since there is no need to form ribs, it becomes possible to reduce the weight of the vehicle body structural components.

[0021] Claim 11 The vehicle body structural member according to the present invention described in Claims 1 to Claims 10 In the vehicle body structural member described in any one of the items, the vehicle body structural member is the convex portion The horizontal part It is formed to extend from the front end in the longitudinal direction of the vehicle, and as it moves towards the front in the longitudinal direction of the vehicle, it extends downward in the vertical direction of the vehicle. The vehicle body structural member according to claim 12 is, 2 ~Claims 4 In any of the vehicle body structural members described in item 1, The vehicle body structural member is curved along the vertical direction of the vehicle and formed in an arch shape, and of the pair of side wall portions, one side wall portion provided on the steep slope portion and the other side wall portion provided on the front end of the vehicle body structural member in the longitudinal direction of the vehicle are arranged opposite each other in the longitudinal direction of the vehicle. [Effects of the Invention]

[0025] Claim 1 ~ 6 The vehicle body structural members described have the excellent effect of suppressing bending deformation when a collision load is applied.

[0026] Claim 7 The vehicle body structural members described have the excellent effect of being able to suppress bending deformation.

[0027] Claim 8 The vehicle body structural member described herein has the excellent effect of being able to absorb greater collision energy in a given stroke.

[0028] Claim 9、11、12 The vehicle body structural members described herein have the excellent effect of further improving the rigidity of the vehicle body structural members themselves.

[0029] Claim 10 The vehicle body structural members described herein have the excellent effect of improving the rigidity of the vehicle body structural members themselves and reducing the weight of the vehicle body structural members. [Brief explanation of the drawing]

[0031] [Figure 1] This is a plan view showing the rear side of the underside of a vehicle equipped with a rear floor side member to which a vehicle body structural member according to one embodiment of the present invention is applied. [Figure 2] This is a side view showing a rear floor side member to which a vehicle body structural member according to one embodiment of the present invention is applied. [Figure 3] This is a side view of a rear floor side member to illustrate 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. [Figure 4] Figure 2 is a schematic side view showing the rear floor side member. [Figure 5] This is a comparative example and is a side view corresponding to Figure 4. [Figure 6] This is a side view showing a front side barrier to which a vehicle body structural member according to one embodiment of the present invention is applied. [Modes for carrying out the invention]

[0032] A vehicle body structural member according to one embodiment of the present invention will be described. In each figure, the arrow FR indicates the front side in the vehicle's longitudinal direction, and the arrow UP indicates the upper side in the vehicle's vertical direction. The arrow OUT indicates the outside in the vehicle's width direction. Hereafter, when simply referring to the longitudinal, left-right, and up-down directions, unless otherwise specified, they refer to the longitudinal direction of the vehicle, the left-right direction (vehicle width direction), and the up-down direction of the vehicle.

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

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

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

[0036] Between the left and right rockers 18, a floor panel 24 is provided that extends along the vehicle's longitudinal and vehicle width directions and constitutes the floor surface of the passenger compartment (cabin) 22. The ends of the floor panel 24 in the vehicle width direction are connected to the left and right rockers 18, respectively. In addition, at the rear end of the rocker 18 in the vehicle's longitudinal direction, a floor cross member is provided between the left and right rockers 18, extending along the vehicle width direction. (2nd floor cross member) A floor cross member 28 is provided, and the floor cross member 28 is connected to the floor panel 24.

[0037] Furthermore, rear floor side members 20 extend along the vehicle's longitudinal direction from the rear side of the left and right rockers 18 in the vehicle's longitudinal direction. Between the left and right rear floor side members 20, a center floor panel 26 is provided, located on the rear side of the floor panel 24 in the vehicle's longitudinal direction, extending along both the vehicle's longitudinal direction and vehicle width direction, and forming the rear floor surface of the passenger compartment 22. The vehicle width direction ends of this center floor panel 26 are connected to the left and right rear floor side members 20, respectively.

[0038] Furthermore, in the central part 52 of the rear floor side member 20 in the vehicle's longitudinal direction, a floor cross member is provided between the left and right rear floor side members 20, along the vehicle's width direction. (First floor cross member) A floor cross member 30 is installed, and the floor cross member 30 is connected to the center floor panel 26.

[0039] Furthermore, a floor cross member 32 is provided between the left and right rear floor side members 20, along the vehicle width direction, at the rear 54 in the vehicle longitudinal direction of the rear floor side member 20. Similar to the floor cross member 30 described above, this floor cross member 32 is also connected to the center floor panel 26.

[0040] Furthermore, a fuel tank 34 is located on the front 50 side of the left and right rear floor side members 20 in the vehicle's longitudinal direction, that is, between the floor cross member 28 and the floor cross member 30, below the center floor panel 26. In addition, although not shown in the figures, suspension towers 36 to which shock absorbers are attached are provided on the outer side of the left and right rear floor side members 20 in the vehicle's width direction.

[0041] Furthermore, rear floor side member barriers 38 extend along the vehicle's longitudinal direction from the rear side of the left and right rear floor side members 20 in the vehicle's longitudinal direction. In addition, a rear floor panel 37 is provided on the rear side of the center floor panel 26 in the vehicle's longitudinal direction, extending along the vehicle's longitudinal direction and vehicle width direction, and forming the floor surface of the cargo compartment 35. On both outer sides of this rear floor panel 37 in the vehicle width direction, rear floor side panels 39 are provided, extending along the vehicle's longitudinal direction and vehicle width direction, and the left and right rear floor side member barriers 38 are connected to these rear floor side panels 39, respectively.

[0042] [Rear floor side member] Here, we will describe in detail the rear floor side member 20 as a vehicle body structural component relating to the actual implementation. First, we will explain the basic configuration of the rear floor side member 20, and then we will explain the main parts of the rear floor side member 20.

[0043] <Basic configuration of rear floor side members> As shown in Figure 1, the rear floor side member 20 is curved to protrude inward in the vehicle width direction when viewed from above, and as shown in Figure 2, it is curved to protrude upward in the vehicle vertical direction when viewed from the side (a so-called arch shape). Figure 2 shows a side view of the rear floor side member 20.

[0044] The rear floor side member 20 is formed from die-cast aluminum, and a mold is used that opens along the vehicle width direction of the rear floor side member 20. Furthermore, when the rear floor side member 20 is cut along the vehicle's vertical and vehicle width directions, the cross-sectional shape is a hat shape with an opening on the outside in the vehicle width direction.

[0045] In other words, the rear floor side member 20 is composed of a rear wall portion (general portion) 40 that constitutes the main part of the rear floor side member 20, a pair of side wall portions 42 and 44 that are erected from the outer edge of the rear wall portion 40 and arranged facing each other, and flange portions 46 and 48 that extend from the ends of the side wall portions 42 and 44, respectively.

[0046] For the sake of explanation, the rear floor side member 20 will be described by dividing it into a front section 50, a central section 52, and a rear section 54 along the longitudinal direction of the vehicle. In the rear floor side member 20 shown in Figure 2, the straight line P shown along the vertical direction indicates the boundary between the front section 50 and the central section 52 of the rear floor side member 20, and the straight line Q indicates the boundary between the central section 52 and the rear section 54 of the rear floor side member 20. Hereafter, the straight line P will be referred to as "boundary line P" and the straight line Q will be referred to as "boundary line Q".

[0047] Furthermore, the front 50 and rear 54 of the rear floor side member 20 are provided with so-called suspension member mounting sections 55 and 57, respectively, to which suspension members are attached (though these are not shown in the figures). The centerlines R and S shown in the front 50 and rear 54 indicate the axis lines of the suspension member mounting sections 55 and 57, respectively. Hereinafter, centerline R will be referred to as "axis line R" and centerline S as "axis line S".

[0048] (Front of the rear floor side member) First, let's describe the front portion 50 of the rear floor side member 20 (hereinafter referred to as "rear floor side member front portion 50").

[0049] As shown in Figure 1, the front portion 50 of the rear floor side member (the end portion of the vehicle body structural member in the vehicle longitudinal direction) is connected to a rocker 18 that extends in the vehicle longitudinal direction at the vehicle side portion 16. The rocker 18 may also be configured with a separate rocker rear 19 at the rear of the vehicle in the vehicle longitudinal direction. In addition, the rear floor side member 20 may have a separate connecting portion 21 at the front portion 50 of the rear floor side member that connects to the rocker 18.

[0050] As shown in Figure 2, the front portion 50 of the rear floor side member is composed of a rear wall portion 40A, side wall portions 42A and 44A, and flange portions 46A and 48A. The upper end 40A1 of the rear wall portion 40A has an inclined portion 41 formed from the front end 50A to the rear end 50B of the front portion 50 of the rear floor side member, which slopes in a gentle curve from the rearward side in the vehicle direction toward the upper side in the vehicle direction toward the rearward side in the vehicle direction toward.

[0051] On the other hand, the lower end 40A2 of the rear wall portion 40A is the front 50C side and rear 50 in the vehicle longitudinal direction of the front portion 50 of the rear floor side member D side The shapes differ between the two. Specifically, the front portion 50C side of the lower end 40A2 of the rear wall portion 40A is formed approximately parallel to the upper end 40A1 of the rear wall portion 40A, and a sloping portion 43 is formed that slopes in a gentle curve upward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction. In contrast, the rear portion 50D side of the lower end 40A2 of the rear wall portion 40A extends approximately horizontally towards the rear in the vehicle's longitudinal direction, and a horizontal portion 45 is formed.

[0052] Furthermore, from the upper end 40A1 and lower end 40A2 of the rear wall portion 40A, side wall portions 42A and 44A are formed, respectively, extending outward in the vehicle width direction, following the shape of the upper end 40A1 and lower end 40A2. Specifically, side wall portion 42A is composed of an inclined portion 41, and side wall portion 44A is composed of an inclined portion 43 and a horizontal portion 45.

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

[0054] (Center of the 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] As shown in Figure 2, the central part of the rear floor side member (the central part of the vehicle's structural member in the vehicle's longitudinal direction) 52 is composed of a back wall portion 40B, side wall portions 42B and 44B, and flange portions 46B and 48B. At the upper end 40B1 of the back wall portion 40B, a curved portion 59 is formed that bulges upward in the vehicle's vertical direction, extending from the front end 52A to the rear end 52B of the central part of the rear floor side member 52.

[0056] On the other hand, the lower end 40B2 of the rear wall portion 40B has a front portion 52C of the central portion 52 of the rear floor side member. (Constitutes another part of the convex section) In this section, a steep slope section 58 is formed that slopes sharply upward in the vertical direction of the vehicle as it moves towards the rear in the longitudinal direction of the vehicle. Furthermore, at the lower end 40B2 of the rear wall section 40B, a curved section 60 is formed that extends from the steep slope section 58 to the rear end 52B of the central part 52 of the rear floor side member, approximately parallel to the upper end 40B1 of the rear wall section 40B, and bulges out in a curved shape upward in the vertical direction of the vehicle.

[0057] From the upper end 40B1 and lower end 40B2 of the rear wall portion 40B, side wall portions 42B and 44B are formed, respectively, extending outward in the vehicle width direction, following the shape of the upper end 40B1 and lower end 40B2. Specifically, side wall portion 42B is composed of a curved portion 59, and side wall portion 44B is composed of a steep slope portion 58 and a curved portion 60.

[0058] Furthermore, the flange portion 46B extends upward in the vehicle's 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's vertical direction from the tip of the side wall portion 44B along the shape of the side wall portion 44B. In the steeply sloped portion 58 of the side wall portion 44B, the flange portion 48B extends towards the rear in the vehicle's longitudinal direction and downward in the vehicle's vertical direction.

[0059] (Rear of the rear floor side member) Furthermore, 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 Figure 1, the rear portion 54 of the rear floor side member (the end of the vehicle body structural member in the vehicle longitudinal direction) is connected to a rear floor side member barrier 38 that extends in the vehicle longitudinal direction at the rear of the vehicle 14. As shown in Figure 2, the rear portion 54 of the rear floor side member is composed of a back wall portion 40C, side wall portions 42C, 44C, and flange portions 46C, 48C. At the upper end 40C1 of the back wall portion 40C, a curved portion 61 is formed that bulges slightly downward in the vehicle vertical direction, extending from the front end 54A to the rear end 54B of the rear floor side member 54.

[0061] On the other hand, at the lower end 40C2 of the rear wall portion 40C, an inclined portion 62 is formed at the front portion 54C of the rear floor side member rear portion 54, which slopes downward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction. Furthermore, at the lower end 40C2 of the rear wall portion 40C, a horizontal portion 63 is formed at the rear portion 54D of the rear floor side member rear portion 54, which extends substantially horizontally towards the rear in the vehicle's longitudinal direction.

[0062] From the upper end 40C1 and lower end 40C2 of the rear wall portion 40C, side wall portions 42C and 44C are formed, respectively, extending outward in the vehicle width direction, following the shapes of the upper end 40C1 and lower end 40C2. Specifically, the side wall portion 42C is composed of a curved portion 61, and the side wall portion 44C is composed of an inclined portion 62 and a horizontal portion 63. Furthermore, the flange portion 46C extends upward in the vehicle vertical direction from the tip of the side wall portion 42C along the shape of the side wall portion 42C, and the flange portion 48C extends downward in the vehicle vertical direction from the tip of the side wall portion 44C along the shape of the side wall portion 44C.

[0063] <Key part of the rear floor side member> In this embodiment, as shown in Figure 2, the rear wall 40 is provided with plate-shaped vertical ribs 66, 78, 86, etc., formed along the vertical direction of the vehicle, and plate-shaped horizontal ribs (ribs) 68, 80, 92, etc., formed along the longitudinal direction of the vehicle, extending between the side wall 42 and the side wall 44, and positioned approximately perpendicular to each other. The plate thickness of the vertical ribs 66, 78, 86, etc. and the horizontal ribs 68, 80, 92, etc. are set to be approximately the same. These vertical ribs 66, 78, 86 and horizontal ribs 68, 80, 92, etc. will be described in detail below.

[0064] (Front of the rear floor side member) First, let's describe the front part 50 of the rear floor side member (the area from the front end 50A of the front part 50 of the rear floor side member to the front end 52A (boundary line P) of the central part 52 of the rear floor side member).

[0065] Multiple vertical ribs 66 are provided on the front portion 50 of the rear floor side member. These vertical ribs 66 are spanned between the side wall portion 42A and the horizontal portion 45 of the side wall portion 44A of the front portion 50 of the rear floor side member. Here, the vertical rib 66A located in the center of the multiple vertical ribs 66 is positioned so as to coincide with the axis line R of the suspension mounting portion 55 described above when viewed from the side of the vehicle. In addition, a vertical rib 70 is provided on the inclined portion 43 side of the side wall portion 44A, and this vertical rib 70 is spanned between the side wall portion 42A and the horizontal rib 72 described later.

[0066] Furthermore, in the front portion 50 of the rear floor side member, multiple transverse ribs (ribs) 68 are provided, positioned substantially perpendicular to the multiple longitudinal ribs 66 mentioned above. These transverse ribs 68 are formed along the vehicle's longitudinal direction, extending from the front portion 50 of the rear floor side member to the front portion 52C of the central portion 52 of the rear floor side member, and are spanned between the side wall portion 42A of the front portion 50 of the rear floor side member and the side wall portion 44B of the central portion 52 of the rear floor side member.

[0067] Furthermore, in the front portion 50C of the front portion 50 of the rear floor side member, inclined ribs 74 and 76 are formed between the side wall portion 42A and the side wall portion 44A, arranged to be substantially parallel to the side wall portions 42A and 44A. The inclined rib 74 is connected to the longitudinal rib 70 and the transverse rib 72, and the inclined rib 76 is connected to the transverse rib 72.

[0068] (Center of the rear floor side member) Next, we will describe the rear floor side member central portion 52 shown in Figure 2 (the area 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 part 54 of the rear floor side member).

[0069] Multiple longitudinal ribs 78 are provided in the central portion 52 of the rear floor side member. These longitudinal ribs 78 are provided in multiples near the top Z of the central portion 52 of the rear floor side member, maintaining a predetermined interval along the longitudinal direction of the vehicle. The longitudinal ribs 78 are spanned between the side wall portion 42B and the side wall portion 44B of the central portion 52 of the rear floor side member, and are arranged to extend radially from approximately the center of curvature of the curved portion 60 of the side wall portion 44B.

[0070] Furthermore, multiple transverse ribs 80 are stretched along the vehicle's longitudinal direction between the longitudinal rib 78A located at the front and the longitudinal rib 78B located at the rear of the multiple longitudinal ribs 78. A longitudinal rib 78C is provided on the front side of the longitudinal rib 78A, and this longitudinal rib 78C is stretched between the side wall portion 42B and the side wall portion 44B.

[0071] Furthermore, between the longitudinal ribs 78C and 78A, there is an inclined rib 82 that is also connected to the side wall 42B and slopes downward in the vertical direction of the vehicle as it moves towards the rear in the longitudinal direction of the vehicle. This inclined rib 82 is also connected to the side wall 42B and the transverse rib (rib) 80A, which will be described later.

[0072] On the other hand, of the transverse ribs 80, the transverse rib 80A, located in the central part of the rear floor side member 52 in the vehicle's vertical direction, extends beyond the longitudinal rib 78B to the side wall 42B. Furthermore, the transverse rib 80B, located below the transverse rib 80A, extends from the side wall 42A, including the side wall 42B, to the side wall 42C of the rear part 54 of the rear floor side member, which will be described later. In addition, an inclined rib 84 is connected to the longitudinal rib 78B between the transverse rib 80A and the transverse rib 80B, and slopes downward in the vehicle's vertical direction as it moves towards the rear in the vehicle's longitudinal direction.

[0073] (Rear of the rear floor side member) Next, we will describe the rear 54 side of the rear floor side member shown in Figure 2 (the area from the front end 52A (boundary line P) of the central part 52 of the rear floor side member to the rear end 54B of the rear floor side member).

[0074] A longitudinal rib 86 is provided on the rear portion 54 of the rear floor side member. This longitudinal rib 86 spans between the side wall portion 42C and the side wall portion 44C of the rear portion 54 of the rear floor side member. Here, the longitudinal rib 86 is provided at a position that coincides with the axis line S of the suspension mounting portion 57 described above when viewed from the side of the vehicle. In addition, longitudinal ribs 88 and 90 are provided on the front and rear sides of the longitudinal rib 86, respectively. The longitudinal rib 88 spans between the side wall portion 42C and the transverse rib (rib) 92A described later, and the longitudinal rib 90 spans between the side wall portion 42C and the transverse rib (rib) 91 described later.

[0075] Furthermore, at the rear 54 of the rear floor side member, transverse ribs 80B, 92, and 92A are provided, positioned approximately perpendicular to the aforementioned longitudinal ribs 86, 88, and 90. The transverse rib 80B extends from the front 54C of the rear 54 of the rear floor side member to the rear 52D of the central 52 of the rear floor side member, and spans between the side wall 44B of the central 52 of the rear floor side member and the side wall 42C of the rear 54 of the rear floor side member. The transverse rib 92 is formed to connect the side wall 44C with the longitudinal ribs 86, 88, and 90, and the transverse rib 92A is formed to connect the side wall 44C with the longitudinal ribs 86 and 88.

[0076] Here, Figure 3 shows a side view of the rear floor side member 20. As shown in Figure 3, at the front part 50 of the rear floor side member, the centroid of the cross section cut along a direction intersecting the vehicle's longitudinal direction (vehicle vertical direction and vehicle width direction), that is, the centroid of the cross section at a predetermined position X1 along the vehicle's longitudinal direction, is indicated by O1. Also, at the central part 52 of the rear floor side member, the centroid of the cross section at a predetermined position X2 along the vehicle's longitudinal direction is indicated by O2. Furthermore, at the rear part 54 of the rear floor side member, the centroid of the cross section at a predetermined position X3 along the vehicle's longitudinal direction is indicated by O3.

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

[0078] By the way, in this embodiment, as described above, the rear floor side member 20 is formed from aluminum die-cast, and the mold (not shown) for forming the rear floor side member 20 is configured to open along the vehicle width direction in the rear floor side member 20.

[0079] The rear floor side member 20 is formed by the mold, and in order to release the rear floor side member 20 from the mold when the mold is open, an ejection pin is provided on the fixed mold side, which is part of the mold, although it is not shown in the figure. This ejection pin contacts the rear floor side member 20 and presses against it, causing the rear floor side member 20 to be released from the fixed mold.

[0080] Therefore, the rear floor side member 20 is provided with an ejector pin seat against which the ejector pin abuts. Specifically, in this embodiment, multiple cylindrical ejector pin seats 93, 94, and 96 are erected from the back wall portion 40 of the rear floor side member 20. The diameters of the ejector pin seats 93, 94, and 96 are set to be thicker than the plate thickness of the vertical ribs 66, 78 and the horizontal ribs 68, 80.

[0081] Furthermore, the ejection pin seat 93 is provided at least at the intersections of the longitudinal ribs 66A, 86 and the side wall portion 42, and at the intersections of the other longitudinal ribs 66, 78, or the transverse ribs 68, 80, 92 and the side wall portion 42, and the ejection pin seat 93 and the side wall portion 42 are integrally formed.

[0082] Furthermore, the ejection pin seat 94 is provided at least at the intersections of the longitudinal ribs 66A, 86 and the side wall portion 44, and at the intersections of the other longitudinal ribs 66, 78, or the transverse ribs 68, 72, 92 and the side wall portion 44, and the ejection pin seat 94 and the side wall portion 44 are integrally formed.

[0083] Furthermore, the ejection pin seats 96 are provided at some of the intersections where the longitudinal ribs 66 and 70 intersect with the transverse rib 68, and at some of the intersections where the longitudinal rib 78 intersects with the transverse rib 80, etc.

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

[0085] [Function and Effects of Vehicle Body Structural Components] Next, the operation and effects 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 Figure 2 is made of die-cast aluminum. Generally, die-cast members have a high degree of design freedom, so they are formed with increased wall thickness in certain areas to obtain high rigidity. However, increasing the wall thickness increases the vehicle weight.

[0087] Therefore, in this embodiment, the rear floor side member 20 is reinforced with the minimum necessary thickness by providing longitudinal ribs 66, 78, 86 etc. formed along the vertical direction of the vehicle and transverse ribs 68, 80, 92 etc. formed along the longitudinal direction of the vehicle between the opposing side wall portions 42 and 44.

[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 applied to the rear floor side member 20 along the longitudinal direction of the vehicle, bending deformation of the rear floor side member 20 can be suppressed.

[0089] Furthermore, in this embodiment, the transverse ribs 68, 80, 92, etc., are formed along the direction of input of the collision load (vehicle longitudinal direction). As a comparative example, for example, consider the case in which, as shown in Figure 5, a rib 202 is formed along a direction intersecting the input direction of the collision load F' (vehicle longitudinal direction) in an arch-shaped rear floor side member 200. When a collision load F' is applied 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 will bend and deform, and there is a possibility that the collision energy will not be absorbed sufficiently. Note that Figure 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 transverse ribs 68, 80, 92, etc., that rise from the rear wall portion 40 of the rear floor side member 20 are formed along the input direction of the collision load F (vehicle longitudinal direction).

[0091] Here, the uppermost of the transverse ribs 68, transverse rib 68A, spans between the side wall portion 42A of the front portion 50 of the rear floor side member and the side wall portion 44B of the central portion 52 of the rear floor side member. Also, the central transverse rib 80B of the transverse ribs 80 spans between the side wall portion 44B of the central portion 52 of the rear floor side member and the side wall portion 42C of the rear portion 54 of the rear floor side member.

[0092] Therefore, when a collision load F is applied to the rear floor side member 20 along the longitudinal direction of the vehicle, the collision load F is transmitted from the side wall portion 42C of the rear part 54 of the rear floor side member to the side wall portion 44B via the transverse rib 80B, and then transmitted to the side wall portion 44A via the transverse rib 68A. At the same time, in the other transverse ribs 92 and 92A provided on the rear part 54 of the rear floor side member, the collision load F is transmitted to the side wall portion 44C, and then transmitted to the side wall portion 44A via the transverse rib 68 through the side wall portion 44B.

[0093] In other words, since the transverse ribs 68, 80, 92, etc. are formed along the direction of input of the collision load F, when a collision load F is applied to the rear floor side member 20, the collision load F is transmitted along the transverse ribs 68, 80, 92, etc. (more precisely, in the order of transverse rib 92, transverse rib 80, transverse rib 68), and the transverse ribs 68, 80, 92, etc. are made axially compressible.

[0094] Thus, when the transverse ribs 68, 80, 92, etc. are axially compressed, the impact energy is effectively absorbed by the deformation (elastic and plastic deformation) of the transverse ribs 68, 80, 92, etc. during the axial compression process. This allows for the absorption of greater impact energy in a given stroke. Conversely, it becomes possible to absorb impact energy in a shorter stroke, preventing cracking even in aluminum die-cast, which has lower ductility than steel plates. Figure 4 is a schematic diagram showing a side view of the rear floor side member 20 shown in Figure 2.

[0095] Furthermore, in this embodiment, side wall portions 42 and 44 are provided, which are erected from the outer edge of the rear wall portion 40 of the rear floor side member 20 and connected to the transverse rib 68. This further reinforces the rear floor side member 20 and improves the rigidity of the rear floor side member 20 itself. However, these side wall portions 42 and 44 are not necessarily required.

[0096] Furthermore, in this embodiment, the transverse ribs 68A and 80B and the side wall portion 44 are formed continuously along the vehicle's longitudinal direction. As a result, the transverse rib 68A, the side wall portion 44, and the transverse rib 80B become integrated in the vehicle's longitudinal direction and form part of the load transmission member.

[0097] In this way, the transverse rib 68A, the side wall portion 44, and the transverse rib 80B are formed continuously along the longitudinal direction of the vehicle, allowing the side wall portion 44 to be used as part of the transverse ribs 68A and 80B. As a result, although not shown in the figures, compared to a case where a rib is formed separately from the side wall portion 44, it becomes possible to reduce the weight of the rear floor side member 20 by eliminating the need to form a new rib.

[0098] Furthermore, the addition of new ribs avoids forging challenges, such as the problem of securing cooling space on the mold side or problems with molten metal flow on the rear floor side member 20 side. Note that, depending on the shape of the rear floor side member 20, the transverse ribs 68A and 80B and the side wall portion 44 do not necessarily need to be formed continuously along the vehicle's longitudinal direction.

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

[0100] The rear floor side member 20 is formed in an arch shape that curves along the vertical direction of the vehicle. In other words, the front portion 50 and the rear portion 54 of the rear floor side member 20 are located below the central portion 52 of the rear floor side member in the vertical direction of the vehicle.

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

[0102] In other words, in this embodiment, in the rear floor side member 20 which is formed in an arch shape that curves along the vertical direction of the vehicle, the height positions of the transverse ribs 68A, 80B, and 80A in the vertical direction of the vehicle are adjusted at the front portion 50, rear portion 54, and central portion 52 of the rear floor side member 20, respectively. As a result, the height positions of the centroids O1, O1, and O3 in the vertical direction of the vehicle can be made substantially constant at each cross section of the rear floor side member 20 in the longitudinal direction of the vehicle.

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

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

[0105] Furthermore, in this embodiment, the rear floor side member 20 has an arch shape that curves along the vertical direction of the vehicle, but it may also be formed in an arch shape that curves along the width direction of the vehicle, and moreover, it is not necessarily required to have an arch shape.

[0106] Furthermore, although the rear floor side member 20 has been described in this embodiment, it is not limited to this. For example, as shown in Figure 6, it may also be applied to a front side member barrier 106 that connects a front side member 102 disposed along the longitudinal direction of the vehicle on the front part 100 side of the vehicle body and a floor under reinforcement 104 disposed along the longitudinal direction of the vehicle on the rear side of the front side member 102 in the longitudinal direction of the vehicle. By forming a rib 106A along the longitudinal direction of the vehicle in the front side member barrier 106, the generation of bending moment can be suppressed during a frontal collision of the vehicle, and the load transmission efficiency can be increased via the rib 106A.

[0107] Furthermore, the present invention may be applied to any vehicle body structural member other than those mentioned above. For this reason, it may be applied to tunnel sections or floor cross members 28 (see Figure 1), etc., in addition to side members.

[0108] Although an example of an embodiment of the present invention has been described above, the embodiments of the present invention are not limited to those described above. One embodiment and various modifications may be used in appropriate combinations, and it goes without saying that the invention can be implemented in various forms without departing from the spirit of the present invention. [Explanation of Symbols]

[0109] 10 vehicles 20. Rear floor side member (vehicle body structural component) 28 Floor cross member (vehicle body structural member, second rear floor cross member) 40 Back wall section (general section) 42 Side wall section 44 Side wall section 50. Front of the rear floor side member (the end of the vehicle's structural member in the vehicle's longitudinal direction) 52. Center of the rear floor side member (the central part of the vehicle's structural member in the vehicle's longitudinal direction) 54 Rear floor side member rear end (vehicle body structural member in the longitudinal direction) 68 Transverse Rib (Rib) 68A Transverse Rib (Rib) 72 Transverse Ribs (Ribs) 80 horizontal ribs (ribs) 80A Transverse Rib (Rib) 80B Transverse Rib (Rib) 91 Transverse rib (rib) 92 Transverse Rib (Rib) 92A Transverse Rib (Rib) 106 Front side barrier (vehicle body structural component) 106A Rib O1 Centroid O2 centroid O3 Center of gravity

Claims

1. A vehicle body structural member formed by a mold, The general part that constitutes the main part of the vehicle body structural member, Ribs erected from the aforementioned general section, Equipped with, The aforementioned vehicle body structural members are arranged along the longitudinal direction of the vehicle, In the vehicle body structural member, a protrusion is formed at the lower end of the general portion, extending downward in the vehicle's vertical direction, from the rear of the front of the front portion in the vehicle's longitudinal direction to the front of the central portion. The aforementioned protrusion is, A horizontal portion is provided at the lower end of the protrusion in the vehicle's vertical direction and extends along a substantially horizontal direction, A steeply sloping section is provided on the rear side in the vehicle's longitudinal direction in the horizontal section, and as it approaches the rear side in the vehicle's longitudinal direction, it slopes sharply upward in the vehicle's vertical direction. Among the aforementioned ribs, a grid portion is formed where longitudinal ribs formed along the vertical direction of the vehicle and transverse ribs formed along the longitudinal direction of the vehicle intersect with each other. It consists of, The ribs constituting the lattice portion are a vehicle body structural member consisting only of the vertical ribs and the horizontal ribs.

2. A vehicle body structural member that is molded by a mold and extends along the longitudinal direction of the vehicle, The general part that constitutes the main part of the vehicle body structural member, Ribs erected from the aforementioned general section, A pair of side wall portions are formed at both ends in the vertical direction, which is substantially perpendicular to the extending direction of the vehicle body structural member, and are erected from the outer edge of the general portion. Equipped with, In the vehicle body structural member, a protrusion is formed at the lower end of the general portion, extending downward in the vehicle's vertical direction, from the rear of the front portion in the vehicle's longitudinal direction to the front of the central portion. The aforementioned protrusion is, A horizontal portion is provided at the lower end of the protrusion in the vehicle's vertical direction and extends along a substantially horizontal direction, A steeply sloping section is provided on the rear side in the vehicle's longitudinal direction in the horizontal section, and as it approaches the rear side in the vehicle's longitudinal direction, it slopes sharply upward in the vehicle's vertical direction. Of the aforementioned ribs, the longitudinal ribs formed along the vertical direction of the vehicle and the transverse ribs formed along the longitudinal direction of the vehicle intersect with each other, and a cross-shaped rib connects the pair of side wall portions, It consists of, The ribs constituting the cross-shaped rib consist only of the longitudinal ribs and the transverse ribs, forming a vehicle body structural member.

3. A vehicle body structural member that is molded by a mold and extends along the longitudinal direction of the vehicle, The general part that constitutes the main part of the vehicle body structural member, Ribs erected from the aforementioned general section, A pair of side wall portions are formed at both ends in the vertical direction, which is substantially perpendicular to the extending direction of the vehicle body structural member, and are erected from the outer edge of the general portion. Equipped with, In the vehicle body structural member, a protrusion is formed at the lower end of the general portion, extending downward in the vehicle's vertical direction, from the rear of the front portion in the vehicle's longitudinal direction to the front of the central portion. The aforementioned protrusion is, A horizontal portion is provided at the lower end of the protrusion in the vehicle's vertical direction and extends along a substantially horizontal direction, A steeply sloping section is provided on the rear side in the vehicle's longitudinal direction in the horizontal section, and as it approaches the rear side in the vehicle's longitudinal direction, it slopes sharply upward in the vehicle's vertical direction. The top portion is the part where the horizontal portion and the steep slope portion intersect, Of the ribs, the first connecting rib that connects the pair of side wall portions, It consists of, The lower end of the front portion of the vehicle body structural member in the longitudinal direction of the vehicle is formed to extend downward in the vertical direction of the vehicle as it moves forward in the longitudinal direction of the vehicle. The aforementioned top portion is a vehicle body structural member formed above the lower end of the front end in the vehicle's longitudinal direction, in the vehicle's vertical direction.

4. The vehicle body structural member according to claim 1, further comprising a pair of side wall portions that are erected from the outer edge of the general portion and formed at both ends in the vertical direction substantially perpendicular to the extending direction of the vehicle body structural member.

5. Of the pair of side wall portions, one side wall portion is provided on the rearward side of the vehicle from the top portion which is the part where the horizontal portion and the steeply sloped portion of the protrusion intersect, Of the aforementioned ribs, a second connecting rib is connected to one of the aforementioned side wall portions, Includes, The vehicle body structural member according to claim 2 or claim 4, wherein the second connecting rib and the one side wall portion are connected via a thickened portion formed to be thicker than the plate thickness of the second connecting rib.

6. The vehicle body structural member according to claim 3, wherein the first connecting rib, which connects to one of the pair of side wall portions that is located on the rearward side of the vehicle from the top portion, and the one side wall portion are connected via a thickened portion that is thicker than the plate thickness of the first connecting rib.

7. The vehicle body structural member according to any one of Claims 1 to 6, wherein the vehicle body structural member is curved along the vertical direction of the vehicle or curved along the width direction of the vehicle to form an arch shape.

8. The vehicle body structural member according to claim 3 or claim 5, wherein the rib is configured to include a transverse rib formed along the longitudinal direction of the vehicle.

9. The vehicle body structural member according to claim 8, wherein at least one of the pair of side wall portions is connected to the transverse rib.

10. The vehicle body structural member according to claim 9, wherein the transverse rib and at least one of the side wall portions are formed continuously along the longitudinal direction of the vehicle.

11. The vehicle body structural member according to any one of Claims 1 to 10, wherein the vehicle body structural member is formed to extend downward in the vertical direction of the vehicle as it moves forward in the longitudinal direction of the vehicle from the front end of the horizontal portion of the protrusion in the longitudinal direction of the vehicle.

12. The vehicle body structural member is formed in an arch shape, curved along the vertical direction of the vehicle, The vehicle body structural member according to any one of claims 2 to 4, wherein, of the pair of side wall portions, one side wall portion provided on the steep slope portion and the other side wall portion provided on the front end in the vehicle longitudinal direction of the vehicle body structural member are arranged facing each other in the vehicle longitudinal direction.

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