Body structural members

Abstract

To obtain a vehicle body structure member capable of suppressing bending deformation at the time of input of a collision load.SOLUTION: At a branch connection 98 for transferring from a main flow A flowing inside a lateral wall part 44 of a rear floor side member 20 to a branch flow B flowing in a longitudinal rib 78, an extrusion pin seat 94 formed to be thicker than the longitudinal rib 78 is disposed, thereby allowing suppression of fluidity failure. Accordingly, defects of the rear floor side member 20 due to a shrinkage cavity or the like can be prevented, and bending deformation at the time of input of a collision load can be suppressed so that cracking and breakage are prevented.SELECTED DRAWING: Figure 3

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 forms 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] Japanese Patent Application Laid-Open No. 2001-030961 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 longitudinal direction of the vehicle, a bending moment is generated, which may cause the closed cross-sectional portion to bend significantly and break.

[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 formed by a mold, and includes a general portion constituting a main portion of the vehicle body structural member, a rib erected from the general portion, and a branch portion erected from the general portion, which connects the general portion and the rib, and is disposed on the rib side of the branch portion and has a diameter larger than the plate thickness of the rib. 1stand a thick portion, and the vehicle body structural member is disposed along the vehicle longitudinal direction and curved along the vehicle vertical direction or along the vehicle width direction to form an arch shape, and the curved portion on the side of the vehicle body structural member with a larger curvature has a plurality of the 1st The thick portions are provided adjacent to each other, and the adjacent 1st No ribs are provided between the thick portions.

[0007] The vehicle body structural member according to the present invention as set forth in claim 1 is molded by a mold. The general portion constituting the main part of the vehicle body structural member is formed with a rib and a plate having a diameter larger than the plate thickness of the rib. 1st The thick portion is erected. 1st The thick portion is disposed on the rib side of the branch portion connecting the general portion and the rib.

[0008] Generally, when material is filled into a molded product through a sprue formed in the mold, the material flows from the main flow that forms the general part that constitutes the main part of the molded product to the branch flow that forms ribs and the like that are thinner than the general part. As the flow path becomes narrower, the flow of the material becomes poor (so-called poor flow), and there is a possibility that defects such as shrinkage cavities will occur in the molded product.

[0009] Therefore, in the present invention, at the branching portion where the main flow flowing through the general portion of the vehicle body structural member transitions to the branch flowing through the rib, a flow path formed with a diameter larger than the plate thickness of the rib is provided. 1st The thick-walled section prevents poor flow of the molten metal. As a result, it is possible to prevent defects in the body structural components due to shrinkage cavities and the like, suppress bending deformation when a collision load is applied, and prevent cracks and fractures when a collision load is applied. In the present invention, the vehicle body structural member is disposed along the vehicle longitudinal direction, and is curved along the vehicle vertical direction or along the vehicle width direction to form an arch shape. 1st The thick portions are provided adjacent to each other, and the adjacent thick portions 1stNo ribs are provided between the thick portions. As described above, the vehicle body structural member is disposed along the longitudinal direction of the vehicle and is formed in a so-called arch shape. Therefore, when a collision load is input to the vehicle body structural member along the longitudinal direction of the vehicle due to a frontal collision of the vehicle (hereinafter referred to as a "vehicle frontal collision") or a rearward collision of the vehicle (hereinafter referred to as a "vehicle rearward collision"), a bending moment is generated in the vehicle body structural member. In this case, in the arch-shaped vehicle body structural member, a tensile force acts on the curved portion on the side with the smaller curvature, and a compressive force acts on the curved portion on the side with the larger curvature. Therefore, in the present invention, at the curved portion on the side of the vehicle body structural member with a large curvature, a plurality of 1st The thick portions are provided adjacent to each other, and the adjacent thick portions 1st There are no ribs between the thick portions. This prevents the adjacent thick portions from being compressed when a compressive force is applied to the curved portion. 1st The thick portions directly interfere with each other, making it possible to suppress deformation of the curved portions.

[0010] A vehicle body structural member according to the present invention as set forth in claim 2 is the vehicle body structural member according to claim 1, wherein the rib includes a horizontal rib formed along the vehicle longitudinal direction and a vertical rib formed along the vehicle vertical direction and intersecting the horizontal rib, Second The thick portion is provided at the intersection where the horizontal rib and the vertical rib intersect. The diameter is larger than the thickness of the rib. are.

[0011] In the vehicle body structural member according to the present invention, a horizontal rib is formed along the vehicle longitudinal direction, and a vertical rib is formed along the vehicle vertical direction. In addition, the horizontal rib and the vertical rib intersect, No. 2 The thickened portions are provided at the intersections where the horizontal ribs and the vertical ribs intersect.

[0012] In this way, by providing the horizontal ribs and the vertical ribs in the vehicle body structural member, the rigidity of the vehicle body structural member itself can be improved. No. 2By providing the thick portions, the horizontal ribs and vertical ribs can be reinforced, the rigidity of the vehicle body structural member itself can be further improved, and deformation of the vehicle body structural member can be suppressed.

[0017] A vehicle body structural member according to the present invention as set forth in claim 3 is the vehicle body structural member according to claim 1 or claim 2, wherein the vehicle body structural member further includes a side wall portion extending from an outer edge of the general portion and connected to the rib, 1st The thick portion is integrally formed with the side wall portion.

[0018] In the vehicle body structural member according to the present invention as set forth in claim 3, a side wall portion extending from an outer edge of the general portion and connected to the rib is provided in the vehicle body structural member, 1st The thick portion is provided integrally with the side wall portion. In this way, by providing the side wall portion in the vehicle body structural member, it is possible to further improve the rigidity of the vehicle body structural member itself and further suppress deformation of the vehicle body structural member.

[0019] Here, if a side wall portion connected to the rib is erected from the outer edge of the general portion, material will flow from the general portion and the side wall portion to the rib when the body structural member is molded. In other words, the general portion and the side wall portion are formed by the "main flow" described in claim 1. Therefore, the "general portion" in the body structural member described in claim 1 includes the flow of material from the "main flow" described in claim 1. 3 This concept also includes the "side wall portion" defined in the above.

[0020] A vehicle body structural member according to the present invention as set forth in claim 4 is a vehicle body structural member according to the present invention as set forth in any one of claims 1 to 3, wherein: At least the first The thick portion includes an ejection pin seat against which an ejection member protruding from the mold abuts and presses to release the vehicle body structural member from the mold when the mold is open.

[0021] In the vehicle body structural member according to the present invention as set forth in claim 4, At least the first The thick-walled portion is configured to include a so-called ejector pin seat, so that when molding a vehicle body structural member, with the mold open, the ejector member protruding from the mold comes into contact with the ejector pin seat and presses against the ejector pin seat, causing the vehicle body structural member to be released from the mold via the ejector pin seat.

[0022] That is, the ejector pin seat is an essential component for releasing a vehicle body structural member from a mold. For this reason, by using a thick-walled portion provided at a branching portion where the main flow that flows through the general portion of the vehicle body structural member transitions to a branch flow that flows through the rib in order to suppress poor molten metal flow, as the ejector pin seat, it is possible to reduce the weight of the vehicle body structural member compared to when a thick-walled portion is formed separately from the ejector pin seat. [Effects of the Invention]

[0023] The vehicle body structural member according to claim 1 has the excellent effect of being able to suppress bending deformation when a collision load is input.

[0024] The vehicle body structural member according to claim 2 has the excellent effect of improving the rigidity of the vehicle body structural member itself and suppressing deformation of the vehicle body structural member.

[0026] Claim 3 The vehicle body structural member described in (1) has the excellent effect of further improving the rigidity of the vehicle body structural member itself and further suppressing deformation of the vehicle body structural member.

[0027] Claim 4 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. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a plan view showing the rear side of a vehicle lower portion provided with a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied. [Figure 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. [Figure 3] 1 is an explanatory plan view showing a main flow and a branch flowing within a side wall portion and a vertical rib of a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied. FIG. [Figure 4] 1 is an enlarged perspective view of a main portion of a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied; [Figure 5] FIG. 4 is a comparative example and is a plan view corresponding to FIG. 3. [Figure 6] FIG. 5 is an enlarged perspective view of a main part corresponding to FIG. 4, showing a comparative example. [Figure 7] 1 is an enlarged perspective view of a main portion of a rear floor side member to which a vehicle body structural member according to an embodiment of the present invention is applied; FIG. [Figure 8] 8 is an enlarged perspective view of a main portion corresponding to FIG. 7 and showing a modified example of a rear floor side member to which a vehicle body structural member according to one embodiment of the present invention is applied. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] A vehicle body structural member according to one 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. Furthermore, 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 in the description, they refer to front / rear in the vehicle longitudinal direction, left / right in the vehicle horizontal direction (vehicle width direction), and up / down in the vehicle vertical direction, unless otherwise specified.

[0030] "Configuration of body structural members" First, the configuration of a vehicle to which the vehicle body structural member according to this embodiment is applied will be described.

[0031] FIG. 1 shows a plan view of the rear part 14 of a vehicle 10 (hereinafter referred to as the "vehicle rear") in a lower part 12 of a vehicle 10 to which a body structural member according to this embodiment is applied (hereinafter referred to as the "vehicle lower part").

[0032] As shown in this figure, rockers 18 extending in the fore-and-aft direction of the vehicle are provided on the left and right sides of the side portions 16 of the vehicle 10 (hereinafter referred to as "vehicle side portions") 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 (vehicle up-down direction and vehicle width direction), and each constitutes a part of the framework of the vehicle side portion 16.

[0033] A floor panel 24 is provided between the left and right rockers 18, extending in the vehicle longitudinal direction and 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 on the rear end side of the rocker 18 in the vehicle longitudinal direction, between the left and right rockers 18, along the vehicle width direction, and the floor cross member 28 is joined onto the floor panel 24.

[0034] Additionally, rear floor side members 20 extend along the vehicle longitudinal direction rearward of the left and right rockers 18. A center floor panel 26 is provided between the left and right rear floor side members 20, positioned rearward of the floor panel 24 in the vehicle longitudinal direction, extending along the vehicle longitudinal 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.

[0035] 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.

[0036] 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 portions 54 of the rear floor side members 20 in the vehicle fore-and-aft direction. Similar to the floor cross member 30 described above, the floor cross member 32 is also joined onto the center floor panel 26.

[0037] 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 longitudinal direction, i.e., between the floor cross member 28 and the floor cross member 30. Furthermore, although not shown, suspension towers 36 to which shock absorbers are attached are provided on the outer sides of the left and right rear floor side members 20 in the vehicle width direction.

[0038] Furthermore, rear floor side member barriers 38 extend along the vehicle longitudinal direction on the rear side of the left and right rear floor side members 20. A rear floor panel 37 extending along the vehicle longitudinal direction and the vehicle width direction and constituting the floor surface of the luggage compartment 35 is provided on the rear side of the center floor panel 26 in the vehicle longitudinal direction. Rear floor side panels 39 extending along the vehicle longitudinal 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.

[0039] [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.

[0040] <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.

[0041] The rear floor side member 20 is formed by aluminum die-casting, and a mold is used that opens along the vehicle width direction of the rear floor side member 20. Furthermore, the cross section of the rear floor side member 20 when cut along the vehicle up-down direction and vehicle width direction forms a hat shape that opens on the outer side in the vehicle width direction.

[0042] That is, the rear floor side member 20, simply put, 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.

[0043] For ease of explanation, the rear floor side member 20 will be described by dividing it 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 Figure 2, a straight line P extending in 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."

[0044] Although not shown, the front portion 50 and rear portion 54 of the rear floor side member 20 are provided with so-called suspension member mounting portions 55, 57, respectively, to which suspension members are attached, and the center lines R, S shown in the front portion 50 and rear portion 54 respectively indicate the axial lines of the suspension member mounting portions 55, 57. Hereinafter, the center line R will be referred to as the "axial line R," and the center line S will be referred to as the "axial line S."

[0045] (Front 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.

[0046] 1, the rear floor side member front portion 50 is connected to a rocker 18 extending in the vehicle longitudinal direction at the vehicle side portion 16. The rocker 18 may be configured such that a rear rocker 19 is provided as a separate member at the rear in the vehicle longitudinal direction. Furthermore, the rear floor side member 20 may be provided with a separate connection portion 21 at the rear floor side member front portion 50 that is connected to the rocker 18.

[0047] 2, rear floor side member front portion 50 includes a rear wall portion 40A, side wall portions 42A and 44A, and flange portions 46A and 48A. An upper end 40A1 of rear wall portion 40A is formed with an inclined portion 41 that slopes gently in a curve from the front end 50A to the rear end 50B of rear floor side member front portion 50 toward the rear in the vehicle longitudinal direction and then upward in the vehicle vertical direction.

[0048] Meanwhile, the lower end 40A2 of the rear wall portion 40A has different shapes at the front 50C side and the rear 50D side in the vehicle front-rear direction of the rear floor side member front portion 50. Specifically, the front 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 extends rearward in the vehicle front-rear direction. In contrast, the rear 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 in the vehicle front-rear direction.

[0049] Side wall portions 42A and 44A are formed from upper end 40A1 and lower end 40A2 of rear wall portion 40A toward the outside in the vehicle width direction, following the shapes of upper end 40A1 and lower end 40A2. That is, side wall portion 42A includes an inclined portion 41, and side wall portion 44A includes an inclined portion 43 and a horizontal portion 45.

[0050] Flange portion 46A extends upward in the vehicle up-down 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 up-down direction from the tip of side wall portion 44A along the shape of side wall portion 44A. Flange portion 46A is cut out on the front portion 50C side of rear floor side member front portion 50 (cutout portion 56). At inclined portion 43 of side wall portion 44A, flange portion 48A extends rearward in the vehicle fore-and-aft direction and downward in the vehicle up-and-down direction.

[0051] (Center of rear floor side member) Next, the center portion 52 of the rear floor side member 20 (hereinafter referred to as "rear floor side member center portion 52") will be described.

[0052] 2, rear floor side member central portion 52 includes rear wall portion 40B, side wall portions 42B, 44B, and flange portions 46B, 48B. A curved portion 59 that bulges upward in the vehicle vertical direction is formed at the upper end 40B1 of rear wall portion 40B, from front end 52A to rear end 52B of rear floor side member central portion 52.

[0053] Meanwhile, a steeply inclined portion 58 that slopes sharply upward in the vehicle vertical direction as it approaches the rear side in the vehicle longitudinal 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 (a curved portion on the side with a larger curvature of the vehicle body structural member) 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 out in a curved shape upward in the vehicle vertical direction.

[0054] 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, following 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 sloped portion 58 and a curved portion 60.

[0055] Furthermore, flange portion 46B extends upward in the vehicle up-down direction from the tip of side wall portion 42B along the shape of side wall portion 42B, and flange portion 48B extends downward in the vehicle up-down direction from the tip of side wall portion 44B along the shape of side wall portion 44B. Note that, at steeply sloped portion 58 of side wall portion 44B, flange portion 48B extends rearward in the vehicle fore-and-aft direction and downward in the vehicle up-down direction.

[0056] (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.

[0057] As shown in Fig. 1, the rear floor side member rear portion 54 is connected to the rear floor side member barrier 38, which extends 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.

[0058] Meanwhile, an inclined portion 62 that slopes downward in the vehicle up-down direction as it extends rearward in the vehicle longitudinal direction is formed at the lower end 40C2 of the rear wall portion 40C, at the front portion 54C of the rear floor side member rear portion 54. Furthermore, a horizontal portion 63 that extends substantially horizontally toward the rear in the vehicle longitudinal direction is formed at the rear portion 54D of the rear floor side member rear portion 54, at the lower end 40C2 of the rear wall portion 40C.

[0059] Side wall portions 42C, 44C are formed from upper end 40C1 and lower end 40C2 of rear wall portion 40C outward in the vehicle width direction, following the shapes of upper end 40C1 and lower end 40C2. That is, side wall portion 42C includes a curved portion 61, and side wall portion 44C includes an inclined portion 62 and a horizontal portion 63. Furthermore, flange portion 46C extends upward in the vehicle up-down direction from the tip of side wall portion 42C following the shape of side wall portion 42C, and flange portion 48C extends downward in the vehicle up-down direction from the tip of side wall portion 44C following the shape of side wall portion 44C.

[0060] <Main parts of rear floor side member> 2, in the present embodiment, plate-like vertical ribs (ribs) 66, 78, 86, etc. formed along the vehicle up-down direction and plate-like horizontal ribs (ribs) 68, 80, 92, etc. formed along the vehicle front-rear direction are provided on the rear wall 40 so as to bridge between the side wall 42 and the side wall 44 and intersect substantially perpendicularly to one another. The plate thicknesses of the vertical ribs 66, 78, 86, etc. and the horizontal ribs 68, 80, 92, etc. are set to be substantially the same. The vertical ribs 66, 78, 86 and the horizontal ribs 68, 80, 92, etc. will be described in detail below.

[0061] (Front 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) side will be described.

[0062] The rear floor side member front portion 50 is provided with a plurality of vertical ribs 66. The vertical ribs 66 span 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 in the center of the plurality of vertical ribs 66 is provided at a position overlapping with the axial center 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 side wall portion 44A on the side of the inclined portion 43, and the vertical rib 70 spans between the side wall portion 42A and a horizontal rib 72 described below.

[0063] Additionally, a plurality of horizontal ribs 68 are provided in the rear floor side member front portion 50 so as to be substantially perpendicular to the aforementioned plurality of vertical ribs 66. The horizontal ribs 68 are formed 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.

[0064] In addition, in the front portion 50C of the rear floor side member front portion 50, inclined ribs (ribs) 74, 76 are formed between the side wall portion 42A and the side wall portion 44A and are arranged so as to be approximately parallel to the side wall portions 42A, 44A, and 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.

[0065] (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) side will be described.

[0066] A plurality of vertical ribs 78 are provided on the rear floor side member central portion 52. The vertical ribs 78 are provided at predetermined intervals along the vehicle front-rear direction near the top Z of the rear floor side member central portion 52. The vertical ribs 78 bridge between the side wall portion 42B and the side wall portion 44B of the rear floor side member central portion 52, and are each arranged so as to extend radially from approximately the center of curvature of the curved portion 60 of the side wall portion 44B.

[0067] Among the vertical ribs 78, a plurality of horizontal ribs 80 are bridged between a vertical rib 78A located at the front and a vertical rib 78B located at the rear. A vertical rib 78C is provided in front of the vertical rib 78A, and the vertical rib 78C bridges between the side wall portion 42B and the side wall portion 44B. An inclined rib (rib) 82, which is also connected to the side wall portion 42B and inclined downward in the vehicle up-down direction as it extends rearward in the vehicle fore-and-aft direction, bridges between the vertical rib 78C and the vertical rib 78A. The inclined rib 82 is also connected to the side wall portion 42B and a horizontal rib 80A, which will be described later.

[0068] On the other hand, of the lateral ribs 80, the lateral rib 80A located in 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. Furthermore, the lateral rib 80B located below the lateral rib 80A extends from the side wall portion 42A to include the side wall portion 42B and across to a side wall portion 42C of the rear floor side member rear portion 54, which will be described later. Note that an inclined rib (rib) 84, which is also connected to the vertical rib 78B and inclined downward in the vehicle up-down direction as it extends rearward in the vehicle fore-and-aft direction, spans between the lateral rib 80A and the lateral rib 80B.

[0069] (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) side will be described.

[0070] A vertical rib (rib) 86 is provided on the rear floor side member rear portion 54. This vertical rib 86 spans 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 axial center 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 rearward of the vertical rib 86, respectively. The vertical rib 88 spans between the side wall portion 42C and a horizontal rib 92 described later, and the vertical rib 90 spans between the side wall portion 42C and a horizontal rib 91 described later.

[0071] Additionally, a plurality of horizontal ribs 92 are provided in the rear floor side member rear portion 54 so as to be substantially perpendicular to the aforementioned plurality of vertical ribs 86, 88, 90. A portion of the horizontal rib 92 is formed extending from the rear portion 52D of the rear floor side member central portion 52 to the front portion 54C of the rear floor side member rear portion 54. In other words, the horizontal rib 92 spans 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. Additionally, the horizontal ribs 91, 92 are formed so as to connect the vertical ribs 86, 88, 90 between the side wall portion 42C or the side wall portion 44C.

[0072] In this embodiment, as described above, the rear floor side member 20 is formed by aluminum die-casting, and the mold (not shown) that forms the rear floor side member 20 is configured to open along the vehicle width direction of the rear floor side member 20.

[0073] After the rear floor side member 20 is molded by the mold and the mold is opened, an ejector pin (not shown) is provided on the movable mold side that constitutes part of the mold in order to release the rear floor side member 20 from the mold. This ejector pin comes into contact with the rear floor side member 20 and presses against the rear floor side member 20, causing the rear floor side member 20 to be released from the movable mold.

[0074] For this reason, ejector pin seats against which the ejector pins come into contact are provided on the rear floor side member 20. Specifically, in this embodiment, a plurality of cylindrical ejector pin seats 93, 94, 96 are erected from the rear wall portion 40 of the rear floor side member 20. The diameters of the ejector pin seats 93, 94, 96 are set to be thicker than the plate thicknesses of the vertical ribs 66, 78, 86 and the horizontal ribs 68, 80, 92, etc.

[0075] The ejector pin seat (thick portion) 93 includes at least the intersection of the vertical ribs 66A, 86 and the side wall portion 42, and is provided at the intersection of other vertical ribs 66, 78 or 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.

[0076] Further, the ejector pin seat (thick portion) 94 includes at least the intersection of the vertical ribs 66A, 86 and the side wall portion 44, and is provided at the intersection of other vertical ribs 66, 78 or 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.

[0077] 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.

[0078] 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.

[0079] As described above, the rear floor side member 20 is disposed along the vehicle longitudinal direction and curved along the vehicle vertical direction to form an arch shape. For this reason, in this embodiment, the rear floor side member 20 has a plurality of ejector pin seats 94 provided adjacent to each other along the curvature of the curved portion 60 on the side with the larger curvature.

[0080] Although not shown here, a notch may be formed in the flange 48 of the rear floor side member 20 to avoid interference with the fuel pipe. Since the notch is weaker than a portion where the notch is not formed, if a notch is formed, the ejector pin seat 94 is located directly above the notch.

[0081] [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.

[0082] In this embodiment, the rear floor side member 20 shown in Fig. 2 is made of die-cast aluminum. Generally, die-cast members have a high degree of design freedom, so they are formed to have a thicker wall in some locations to obtain high rigidity, but increasing the wall thickness increases the vehicle weight.

[0083] For this reason, in this embodiment, vertical ribs 66, 78, 86, etc. formed along the vehicle vertical direction and horizontal ribs 68, 80, 92, etc. formed along the vehicle longitudinal direction are provided between the opposing side wall portions 42 and 44 of the rear floor side member 20, thereby reinforcing the rear floor side member 20 with the minimum necessary thickness.

[0084] In this embodiment, the diameters of the ejector pin seats 93, 94, 96 are set to be thicker than the plate thicknesses of the vertical ribs 66, 78 and the horizontal ribs 68, 80, etc. The ejector pin seat 93 is formed integrally with the side wall portion 42, and the ejector pin seat 94 is formed integrally with the side wall portion 44. For this reason, the ejector pin seats 93, 94 are thicker than the ejector pin seat 96 located inside the ejector pin seats 93, 94, that is, between the side wall portions 42 and 44.

[0085] In this embodiment, as shown in Fig. 3, for example, the ejector pin seat 94 is disposed in a branch portion 98 where the material forming the rear floor side member 20 transitions from a main flow A flowing from the flange portion 48 of the rear floor side member 20 through the side wall portion 44 to a branch flow B flowing through the longitudinal rib 78 during molding of the rear floor side member 20, and is formed to be thicker than the longitudinal rib 78. Note that Fig. 3 is an explanatory plan view showing the main flow A and the branch flow B flowing through the side wall portion 44 and the longitudinal rib 78 of the rear floor side member 20, and in this embodiment, the outer end side of the flange portion 48 serves as a sprue through which material is filled from the mold. Here, the "general portion" recited in claim 1 refers to the side wall portion 44 in Fig. 3.

[0086] Generally, although not shown, in a molded product formed using a mold, when the material for forming the molded product is filled into the mold, the material is filled through a sprue formed in the mold, and it is desirable that the flow path when filling the material into the hollow portion formed in the mold (hereinafter referred to as the "cavity") is uniform across each cross section of the molded product. In other words, it is desirable that the thickness of each cross section of the molded product is approximately constant. However, since molded products can be formed into complex shapes, the thickness of each cross section of the molded product is often not constant.

[0087] Therefore, when material is filled into the mold from the sprue, as shown in Fig. 5, the flow path suddenly narrows as the material flows from the general portion 202 of the molded product 200 to the rib 204, which can cause poor flow of the molten metal (so-called poor flow), potentially resulting in defects such as shrinkage cavities in the molded product 200. As a result, when a collision load is applied, the molded product 200 can be significantly bent and deformed, as shown in Fig. 6. Fig. 5 is an explanatory plan view showing a main flow A and a branch flow B flowing through the molded product 200 as a comparative example. Fig. 6 is an enlarged perspective view of a main portion of the molded product 200 as a comparative example, showing the bent and deformed state.

[0088] In contrast to this, in this embodiment, as shown in Figure 3, poor molten metal flow can be suppressed by providing an ejection pin seat 94 that is thicker than the vertical rib 78 at a branch section 98 where the main current A flowing inside the side wall section 44 of the rear floor side member 20 transitions to the branch current B flowing along the vertical rib 78. This makes it possible to prevent defects in the rear floor side member 20 due to shrinkage cavities and the like, suppress bending deformation when a collision load is input, and prevent cracks and breaks when a collision load is input.

[0089] 2, in the rear floor side member 20, horizontal ribs 68, 80, 92, etc. are formed along the vehicle longitudinal direction, and vertical ribs 66, 78, 86, etc. are formed along the vehicle vertical direction. The horizontal ribs 68, 80, 92 intersect with the vertical ribs 66, 78, 86, and ejector pin seats 96 are provided at the intersections where the horizontal ribs 68 and the vertical ribs 66 intersect, the intersections where the horizontal ribs 80 and the vertical ribs 78 intersect, and the intersections where the horizontal ribs 92 and the vertical ribs 86 intersect.

[0090] In this way, by providing the horizontal ribs 68, 80, 92, etc. and the vertical ribs 66, 78, 86, etc. in the rear floor side member 20, the rigidity of the rear floor side member 20 itself can be improved. Then, by providing extrusion pin seats 96 at the intersections of the horizontal ribs 68 and the vertical ribs 66, the intersections of the horizontal ribs 80 and the vertical ribs 78, and the intersections of the horizontal ribs 92 and the vertical ribs 86, the horizontal ribs 68, 80, 92 and the vertical ribs 66, 78, 86 can be reinforced. This further improves the rigidity of the rear floor side member 20 itself, making it possible to suppress deformation of the rear floor side member 20.

[0091] 2, the rear floor side member 20 is disposed along the vehicle longitudinal direction and curved along the vehicle vertical direction to form an arch shape. In the rear floor side member 20, a plurality of ejector pin seats 94 are provided adjacent to each other along the curvature of the curved portion 60 on the side with the larger curvature.

[0092] As described above, the rear floor side member 20 is disposed along the vehicle longitudinal direction and is formed in a so-called arch shape, so when a collision load is input to the rear floor side member 20 along the vehicle longitudinal direction due to a frontal or rearal collision of the vehicle, a bending moment is generated in the rear floor side member 20. In this case, in the arch-shaped rear floor side member 20, a tensile force acts on the curved portion 59 on the side with the smaller curvature, and a compressive force acts on the curved portion 60 on the side with the larger curvature.

[0093] For this reason, as described above, in this embodiment, as shown in Fig. 4, in the curved portion 60 on the side with the larger curvature of the rear floor side member 20, a plurality of ejector pin seats 94 are provided adjacent to each other along the curvature of the curved portion 60. As a result, when a compressive force is applied to the curved portion 60, the adjacent ejector pin seats 94 interfere with each other, making it possible to suppress deformation of the curved portion 60 and effectively suppress bending deformation of the rear floor side member 20. Note that Fig. 4 is an enlarged perspective view of a main portion of the rear floor side member central portion 52, which is a main portion of the rear floor side member 20.

[0094] Furthermore, in this embodiment, the rear floor side member 20 has side wall portions 42, 44 that extend from the outer edge of the rear wall portion 40 and connect to the horizontal ribs 68, 80, 92 and the vertical ribs 66, 78, 86, etc., and the ejector pin seats 93, 94 are formed integrally with the side wall portions 42, 44. In this way, by providing the side wall portions 42, 44 in the rear floor side member 20, the rigidity of the rear floor side member 20 itself can be further improved, and deformation of the rear floor side member 20 can be further suppressed.

[0095] Furthermore, in this embodiment, the thick portions are so-called ejector pin seats. Therefore, when molding the rear floor side member 20, with a mold (not shown) opened, an ejector member protruding from the mold comes into contact with and presses against the ejector pin seats 93, 94, causing the rear floor side member 20 to be released from the mold via the ejector pin seats 93, 94.

[0096] That is, the ejector pin seats 93, 94 are essential components for releasing the rear floor side member 20 from the mold. For this reason, as shown in Fig. 3, by using a thick portion provided at a branch portion 98 where the main flow A flowing through the side wall portion 44 of the rear floor side member 20 transitions to the branch flow B flowing through the vertical rib 78 as the ejector pin seat 94 in order to suppress poor molten metal flow, it is possible to reduce the weight of the rear floor side member 20 compared to when a thick portion is formed separately from the ejector pin seat 94.

[0097] That is, in this embodiment, the rigidity of the rear floor side member 20 itself can be improved, and the weight of the rear floor side member 20 can be reduced. Note that in this embodiment, the outer end side of the flange portion 48 of the rear floor side member 20 shown in FIG. 2 serves as a sprue through which material is poured from a mold, but the sprue is not limited to this. For example, the outer end side of the flange portion 48 and the outer end side of the flange portion 46 of the rear floor side member 20 may serve as sprues.

[0098] In this embodiment, as shown in FIG. 7, an ejector pin seat 94 is integrally provided on the side wall portion 44 of the rear floor side member 20 as a thick portion connected to the vertical rib 78, and the ejector pin seat 94 is cylindrical, but this is not limited to this. For example, as shown in FIG. 8, an ejector pin seat 100 does not necessarily have to be cylindrical. Furthermore, the thick portion connected to the vertical rib 78 only needs to be thicker than the vertical rib 78, and does not necessarily have to be an ejector pin seat that an ejector pin of a mold abuts against. Note that FIG. 7 is an enlarged perspective view of a main portion of the rear floor side member 20, and FIG. 8 is an enlarged perspective view of a main portion corresponding to FIG. 7.

[0099] (Supplementary information about 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 such as zinc, magnesium, or copper, or may be formed by casting. Furthermore, the rear floor side member 20 may be molded from fiber reinforced plastic (FRP).

[0100] In addition, in this embodiment, the rear floor side member 20 is formed in 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 furthermore, it does not necessarily have to be formed in an arch shape.

[0101] In addition, in this embodiment, the ejector pin seat 93 is formed integrally with the side wall portion 42, and the ejector pin seat 94 is formed integrally with the side wall portion 44, but the side wall portions 42, 44 are not necessarily required.

[0102] Furthermore, in this embodiment, the rear floor side member 20 has been described, but the present invention is not limited to this and may be applied to any vehicle body structural member. For example, the present invention may be applied to a tunnel portion or a floor cross member 28 (see FIG. 1) other than the side member.

[0103] Although one example of an embodiment of the present invention has been described above, 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 goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0104] 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 part (general part) 44 Side wall part (general part) 60 Curved section (curved section on the side of the body structural member with a larger curvature) 66 Vertical rib (rib) 68 Horizontal rib (rib) 70 Vertical rib (rib) 72 Horizontal rib (rib) 74 Inclined Rib (Rib) 76 Inclined Rib (Rib) 78 Vertical rib (rib) 80 Horizontal rib (rib) 82 Inclined Rib (Rib) 84 Inclined Rib (Rib) 86 Vertical rib (rib) 88 Vertical rib (rib) 90 Vertical rib (rib) 91 Horizontal rib (rib) 92 Horizontal rib (rib) 93 Extrusion pin seat (thick part) 94 Extrusion pin seat (thick part) 96 Extrusion pin seat (thick part) 98 Branch 100 ejector pin seat A Mainstream B tributary

Claims

1. A vehicle body structural member formed by a mold, a general portion that constitutes a main portion of the vehicle body structural member; a rib extending from the general portion; a first thick-walled portion that stands upright from the general portion, is arranged on the rib side of a branch portion that connects the general portion and the rib, and is formed with a diameter larger than a plate thickness of the rib; The invention comprises: The body structural member is arranged along the fore-and-aft direction of the vehicle, and is curved along the up-and-down direction of the vehicle or along the width direction of the vehicle to form an arch shape, and a plurality of the first thick portions are provided adjacent to each other at the curved portion on the side of the body structural member with a larger curvature, and no ribs are provided between adjacent first thick portions.

2. The rib is configured to include a horizontal rib formed along the vehicle front-rear direction and a vertical rib formed along the vehicle up-down direction and intersecting the horizontal rib, 2. The vehicle body structural member according to claim 1, wherein the second thick portion is provided at an intersection of the horizontal rib and the vertical rib, and is formed with a diameter larger than the thickness of the rib.

3. 2. The vehicle body structural member according to claim 1, further comprising a side wall portion extending from an outer edge of the general portion and connected to the rib, and the first thick portion is formed integrally with the side wall portion.

4. A vehicle body structural member described in any one of claims 1 to 3, wherein at least the first thick-walled portion includes an extrusion pin seat against which an extrusion member protruding from the mold abuts and presses in order to release the vehicle body structural member from the mold when the mold is open.

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