JP2020117061A - Body structure member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle body structural member capable of reducing the amount of deformation when a repetitive load is input. SOLUTION: In a rear floor side member 20, a vertical rib is formed on the extrusion pin seat 94 side of a vertical rib 66A connecting an extrusion pin seat 94 on the side wall portion 44 side and an extrusion pin seat 96 located inside the extrusion pin seat 94. A convex portion 98 is provided when viewed from the plate thickness direction of 66A. As a result, at least the extrusion pin seat 94 side of the vertical rib 66A is reinforced on the extrusion pin seat 94 side of the vertical rib 66A as compared with the case where a recess is formed when viewed from the plate thickness direction of the vertical rib 66A. , At least on the extrusion pin seat 94 side of the vertical rib 66A, the rigidity can be increased. As a result, the deformation of the vertical rib 66A can be suppressed, and the amount of deformation of the rear floor side member 20 when a repetitive load is input can be reduced. [Selection diagram] Fig. 4

Description

The present invention relates to a vehicle body structural member.

In Patent Document 1, a standing wall portion is erected at an outer edge of a flat surface portion (hereinafter, referred to as “general portion”) that constitutes a part of a skeleton member of the vehicle (hereinafter, referred to as “vehicle body structural member”) and faces each other. There is disclosed a technique for reinforcing the vehicle body structural member by connecting the arranged standing wall portions with ribs.

JP, 2017-114409, A

In the above-mentioned prior art, the rib is formed with an R-shaped recess that is recessed toward the general portion side when viewed from the thickness direction of the rib. Therefore, for example, when a vehicle is traveling (hereinafter referred to as “vehicle traveling”) or the like, when a load is repeatedly applied to the vehicle body structural member along the thickness direction of the general portion, the general portion of the rib is changed. The angle with respect to changes, and the displacement (deformation amount) of the vehicle body structural member may increase.

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to provide a vehicle body structural member capable of reducing the amount of deformation when a repeated load is input.

The vehicle body structural member according to the present invention according to claim 1 is a vehicle body structural member formed by a mold, wherein a general portion forming a main portion of the vehicle body structural member and a rib standing from the general portion. A thick portion that is erected from the outer edge of the general portion, is connected to the rib, and is formed thicker than the rib; and a plate of the rib that is provided on the thick portion side of the rib. When viewed from the thickness direction, a convex portion formed in a convex shape in the direction in which the thick portion is erected, or a straight line in a direction away from the thick portion including the tip surface of the thick portion And a linear portion formed in a shape.

The vehicle body structural member according to the first aspect of the present invention is formed by a mold. A rib is provided upright from a general portion that constitutes a main portion of the vehicle body structural member. Further, a thick portion is erected from the outer edge portion of the general portion, and the thick portion is formed to be connected to the rib and thicker than the rib. As described above, the thick portion is thicker than the rib, so that it is possible to obtain higher rigidity than the rib. Therefore, in the vehicle body structural member, the thick portion is formed in the portion where high rigidity is required.

Further, the thick portion is formed so as to be connected to the rib. By thus forming the thick portion and the rib in a continuous manner, it is possible to further improve the rigidity of the vehicle body structural member itself, as compared with the case where the thick portion and the rib are individually formed.

Then, on the thick portion side of the rib, when viewed from the plate thickness direction of the rib, the convex portion formed in a convex shape in the direction in which the thick portion is erected, or the tip surface of the thick portion A linear portion that is linearly formed is included in the direction away from the thick portion.

As described above, the rigidity of the vehicle body structural member itself can be improved by connecting the thick portion and the rib. Here, as a comparative example, for example, in the thick-walled portion side of the rib, when viewed from the plate thickness direction of the rib, when the concave portion formed in a concave shape toward the general portion side is provided, When a load is input, in the vehicle body structural member, a moment acts from the concave portion as a starting point, and the strain (deformation) in the rib may increase.

On the other hand, in the present invention, on the thick portion side of the rib, when viewed from the plate thickness direction of the rib, a convex portion formed in a convex shape in the direction in which the thick portion is erected, or A straight line portion including a front end surface of the thick wall portion and formed in a straight line in a direction away from the thick wall portion is provided. That is, in the present invention, the recess is not formed on the thick-walled portion side of the rib, which requires high rigidity, when viewed in the plate thickness direction of the rib.

Thereby, in the present invention, the thick-walled portion side of the rib is reinforced as compared with the case where the concave portion is formed toward the general portion side when viewed from the plate thickness direction of the rib. can do. As a result, the deformation of the ribs can be suppressed, and the amount of deformation of the vehicle body structural member body can be reduced even when the vehicle is traveling.

The vehicle body structural member according to the first aspect has an excellent effect that the deformation amount can be reduced when the repeated load is input.

FIG. 3 is a plan view showing a rear portion side in a vehicle lower portion including a rear floor side member to which the vehicle body structural member according to the embodiment of the present invention is applied. 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. FIG. 3 is an enlarged perspective view of an essential part of the rear floor side member to which the vehicle body structural member according to the embodiment of the present invention is applied. FIG. 3 is an enlarged cross-sectional view of an essential part in which an essential part of a rear floor side member is enlarged when cut along a line AA shown in FIG. 2. FIG. 6 is a schematic view for explaining the operation of the rear floor side member to which the vehicle body structural member according to the embodiment of the present invention is applied, and is an enlarged cross-sectional view of a main part in which a main part is enlarged in FIG. 4. FIG. 6 is a comparative example and is an enlarged perspective view of a main part corresponding to FIG. 3. FIG. 5 is a comparative example and is an enlarged cross-sectional view of a main part corresponding to FIG. 4. FIG. 6 is a comparative example and is an enlarged cross-sectional view of a main part corresponding to FIG. 5.

A vehicle body structural member according to an embodiment of the present invention will be described. In each figure, an arrow FR, which is shown as appropriate, indicates the front side in the vehicle front-rear direction, and an arrow UP indicates the upper side in the vehicle up-down direction. An arrow OUT indicates the outside in the vehicle width direction. In the following description, when only the front-rear direction, the left-right direction, and the up-down direction are used, the front-rear direction in the vehicle front-rear direction, the left-right direction in the vehicle left-right direction (vehicle width direction), and the up-down direction in the vehicle up-down direction are indicated unless otherwise specified. To do.

"Structure of body structural members"
First, the configuration of a vehicle to which the vehicle body structural member according to the present embodiment is applied will be described.

FIG. 1 illustrates a rear portion (hereinafter, referred to as “vehicle rear portion”) 14 side of a vehicle 10 in a lower portion (hereinafter, referred to as “vehicle lower portion”) 12 to which a vehicle body structural member according to the present embodiment is applied. A plan view is shown.

As shown in this figure, rockers 18 extending in the vehicle front-rear direction are provided on the left and right sides of a side portion (hereinafter referred to as “vehicle side portion”) 16 of the vehicle 10. The left and right rockers 18 have a closed cross-sectional shape when cut along a direction (vehicle up-down direction and vehicle width direction) orthogonal to the longitudinal direction of the rocker 18, and each side portion of the vehicle. It forms part of the 16 skeleton.

A floor panel 24 that extends along the vehicle front-rear direction and the vehicle width direction and constitutes the floor surface of the vehicle interior (cabin) 22 is provided between the left and right rockers 18, and the floor panel 24 has a vehicle width direction. Both end portions of the are connected to the left and right rockers 18, respectively. Further, a floor cross member 28 is disposed on the rear end side of the rocker 18 in the vehicle front-rear direction along the vehicle width direction between the left and right rockers 18, and the floor cross member 28 includes the floor panel 24. Is combined on.

Rear floor side members 20 extend along the vehicle front-rear direction behind the left and right rockers 18 in the vehicle front-rear direction. Between the left and right rear floor side members 20, a center that is located on the rear side in the vehicle front-rear direction of the floor panel 24 and extends along the vehicle front-rear direction and the vehicle width direction to form the floor surface on the rear side of the vehicle compartment 22. A floor panel 26 is provided. Both ends of the center floor panel 26 in the vehicle width direction are connected to the left and right rear floor side members 20, respectively.

Further, a floor cross member 30 is arranged in the vehicle longitudinal direction center portion 52 of the rear floor side member 20 between the left and right rear floor side members 20 along the vehicle width direction. , Is connected to the center floor panel 26.

Further, on the rear portion 54 of the rear floor side member 20 in the vehicle front-rear direction, a floor cross member 32 is arranged between the left and right rear floor side members 20 along the vehicle width direction. Similar to the floor cross member 30 described above, the floor cross member 32 is also connected to the center floor panel 26.

A fuel tank 34 is disposed below the center floor panel 26 between the left and right rear floor side members 20 in the front-rear direction 50 of the vehicle, that is, between the floor cross members 28 and 30. There is. Although not shown, suspension towers 36 and the like to which shock absorbers are attached are provided outside the left and right rear floor side members 20 in the vehicle width direction.

Further, rear floor side member rears 38 extend along the vehicle front-rear direction on the rear sides of the left and right rear floor side members 20 in the vehicle front-rear direction. Further, on the rear side of the center floor panel 26 in the vehicle front-rear direction, there is provided a rear floor panel 37 that extends along the vehicle front-rear direction and the vehicle width direction and constitutes the floor surface of the luggage compartment 35. Rear floor side panels 39 extending along the vehicle front-rear direction and along the vehicle width direction are provided on both outsides of the rear floor panel 37 in the vehicle width direction, and the left and right rear floor side members rears 38 are the rear floor side members. Each is connected to the panel 39.

[Rear floor side member]
Here, the rear floor side member 20 as the vehicle body structural member according to the present embodiment will be described in detail. First, the basic configuration 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.

<Basic configuration of rear floor side members>
As shown in FIG. 1, the rear floor side member 20 is curved so as to project inward in the vehicle width direction in a plan view, and as shown in FIG. It is curved so as to project upward in the vehicle up-down direction (so-called arched shape). Note that FIG. 2 shows a side view of the rear floor side member 20.

The rear floor side member 20 is formed by aluminum die casting, and a mold that opens in the vehicle width direction of the rear floor side member 20 is used. Further, the rear floor side member 20 has a hat-shaped cross-sectional shape when cut along the vehicle up-down direction and the vehicle width direction and has an opening on the outside in the vehicle width direction.

That is, the rear floor side member 20 will be briefly described. The rear wall portion (general portion) 40 that constitutes a main part of the rear floor side member 20 and the rear wall side member 20 that are erected from the outer edge of the rear wall portion 40 and are arranged to face each other. And a pair of side wall portions 42 and 44, and flange portions 46 and 48 extending from the tips of the side wall portions 42 and 44, respectively.

Here, for convenience of description, the rear floor side member 20 will be described by being divided into a front portion 50, a central portion 52, and a rear portion 54 along the vehicle front-rear direction. In the rear floor side member 20 shown in FIG. 2, a straight line P shown along the vertical direction indicates a 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 rear floor side member 20. The boundary between the central portion 52 and the rear portion 54 is shown. Hereinafter, the straight line P is referred to as a "boundary line P", and the straight line Q is referred to as a "boundary line Q".

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

(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.

As shown in FIG. 1, the rear floor side member front portion 50 is connected to the rocker 18 that extends in the vehicle front-rear direction on the vehicle side portion 16. The rocker 18 may have a structure in which a rocker rear 19 is provided as a separate member at the rear portion in the vehicle front-rear direction. Further, in the rear floor side member 20, the connection portion 21 connected to the rocker 18 may be separately provided in the rear floor side member front portion 50.

As shown in FIG. 2, the rear floor side member front portion 50 is configured to include a back 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 forms a gentle curve from the front end 50A of the rear floor side member front portion 50 to the rear end 50B toward the rear side in the vehicle front-rear direction toward the upper side in the vehicle up-down direction. Then, an inclined portion 41 that is inclined is formed.

On the other hand, the lower end 40A2 of the rear wall portion 40A has different shapes on the front portion 50C side and the rear portion 50D side of the rear floor side member front portion 50 in the vehicle front-rear direction. Specifically, the front portion 50C side of the lower end 40A2 of the back wall portion 40A is formed substantially parallel to the upper end 40A1 of the back wall portion 40A, and the vehicle up-down direction in the vehicle up-down direction becomes closer to the rear side in the vehicle front-rear direction. An inclined portion 43 is formed which inclines in a gentle curve toward the upper side. On the other hand, on the rear portion 50D side of the lower end 40A2 of the inner wall portion 40A, a horizontal portion 45 extending substantially horizontally toward the rear side in the vehicle front-rear direction is formed.

Then, from the upper end 40A1 and the lower end 40A2 of the inner wall portion 40A, side wall portions 42A and 44A are formed toward the outside in the vehicle width direction along the shapes of the upper end 40A1 and the lower end 40A2, respectively. That is, the side wall portion 42A includes the inclined portion 41, and the side wall portion 44A includes the inclined portion 43 and the horizontal portion 45.

The flange portion 46A extends from the tip of the side wall portion 42A toward the upper side in the vehicle vertical direction along the shape of the side wall portion 42A, and the flange portion 48A extends from the tip of the side wall portion 44A to the side wall portion 44A. It extends toward the lower side in the vehicle up-down direction along the shape of. In the flange portion 46A, the front floor portion 50C side of the rear floor side member front portion 50 is notched (notch portion 56). Further, in the inclined portion 43 of the side wall portion 44A, the flange portion 48A extends toward the rear side in the vehicle front-rear direction and the lower side in the vehicle up-down direction.

(Center part of rear floor side member)
Next, the central portion 52 of the rear floor side member 20 (hereinafter, referred to as “rear floor side member central portion 52”) will be described.

As shown in FIG. 2, the rear floor side member central portion 52 is configured to include a back wall portion 40B, side wall portions 42B and 44B, and flange portions 46B and 48B. A curved portion 59 that bulges upward in the vehicle vertical direction is formed on the upper end 40B1 of the back wall portion 40B from the front end 52A of the rear floor side member central portion 52 to the rear end 52B.

On the other hand, at the lower end 40B2 of the back wall portion 40B, at the front portion 52C of the rear floor side member central portion 52, a steep slope portion that steeply inclines toward the upper side in the vehicle up-down direction toward the rear side in the vehicle front-rear direction. 58 is formed. Further, the lower end 40B2 of the inner wall portion 40B is formed substantially parallel to the upper end 40B1 of the inner wall portion 40B from the steep slope portion 58 to the rear end 52B of the rear floor side member central portion 52, and is arranged in the vehicle vertical direction. A curved portion 60 that expands in a curved shape toward the upper side is formed.

Side walls 42B and 44B are formed from the upper end 40B1 and the lower end 40B2 of the inner wall 40B toward the outer side in the vehicle width direction along the shapes of the upper end 40B1 and the lower end 40B2, respectively. That is, the side wall portion 42B is configured to include the curved portion 59, and the side wall portion 44B is configured to include the steep slope portion 58 and the curved portion 60.

The flange portion 46B extends from the tip of the side wall portion 42B toward the upper side in the vehicle vertical direction along the shape of the side wall portion 42B, and the flange portion 48B extends from the tip of the side wall portion 44B to the side wall portion 44B. It extends toward the lower side in the vehicle up-down direction along the shape of. In the steep slope portion 58 of the side wall portion 44B, the flange portion 48B extends toward the rear side in the vehicle front-rear direction and the lower side in the vehicle up-down direction.

(Rear part of rear floor side member)
Further, 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.

As shown in FIG. 1, the rear floor side member rear portion 54 is connected to the rear floor side member rear 38 that extends in the vehicle front-rear direction in 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 and 44C, and flange portions 46C and 48C. A curved portion 61 that slightly bulges downward in the vehicle vertical direction is formed on 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.

On the other hand, on the lower end 40C2 of the rear wall portion 40C, an inclined portion 62 is formed in the front portion 54C of the rear floor side member rear portion 54 so as to incline downward in the vehicle vertical direction toward the rear side in the vehicle longitudinal direction. ing. Further, at the lower end 40C2 of the inner wall portion 40C, a horizontal portion 63 is formed in the rear portion 54D of the rear floor side member rear portion 54 and extends along a substantially horizontal direction toward the rear side in the vehicle front-rear direction.

Side walls 42C and 44C are formed from the upper end 40C1 and the lower end 40C2 of the inner wall 40C toward the outer side in the vehicle width direction along the shapes of the upper end 40C1 and the lower end 40C2, respectively. That is, the side wall portion 42C includes the curved portion 61, and the side wall portion 44C includes the inclined portion 62 and the horizontal portion 63. Also, the flange portion 46C extends from the tip of the side wall portion 42C toward the upper side in the vehicle vertical direction along the shape of the side wall portion 42C, and the flange portion 48C extends from the tip of the side wall portion 44C to the side wall portion 44C. It extends toward the lower side in the vehicle up-down direction along the shape of.

<Main part of rear floor side member>
By the way, in the present embodiment, as shown in FIG. 2, the back wall portion 40 has a plate-like shape formed along the vehicle up-down direction so as to bridge between the side wall portion 42 and the side wall portion 44. Vertical ribs (ribs) 66, 78, 86, etc., and plate-shaped horizontal ribs (ribs) 68, 80, 92, etc. formed along the vehicle front-rear direction are provided substantially orthogonal to each other. The vertical ribs 66, 78, 86, etc. and the horizontal ribs 68, 80, 92, etc. are set to have substantially the same plate thickness. The vertical ribs 66, 78, 86, the horizontal ribs 68, 80, 92, etc. will be described in detail below.

(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) will be described.

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

In the rear floor side member front portion 50, a plurality of horizontal ribs 68 are provided so as to be substantially orthogonal to the above-described plurality of vertical ribs 66. The lateral 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 the side wall portion 42A of the rear floor side member front portion 50 and the side wall of the rear floor side member central portion 52. It is bridged between the parts 44B.

Further, in the front portion 50C of the rear floor side member front portion 50, inclined ribs (ribs) 74 and 76 are formed between the side wall portions 42A and 44A so as to be substantially parallel to the side wall portions 42A and 44A. The inclined ribs 74 are connected to the vertical ribs 70 and the horizontal ribs 72, and the inclined ribs 76 are connected to the horizontal ribs 72.

(Center part of rear floor side member)
Next, the rear floor side member central portion 52 (the area from the front end 52A of the rear floor side member central portion 52 (boundary line P) to the front end 54A (boundary line Q) of the rear floor side member rear portion 54) will be described.

A plurality of vertical ribs 78 are provided in the central portion 52 of the rear floor side member. A plurality of the vertical ribs 78 are provided near the apex Z of the central portion 52 of the rear floor side member with a predetermined space therebetween along the vehicle front-rear direction. The vertical ribs 78 are bridged between the side wall portion 42B and the side wall portion 44B of the rear floor side member central portion 52, and are arranged so as to extend radially from the substantial curvature center of the curved portion 60 of the side wall portion 44B. Has been done.

Then, among the plurality of 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 on the front side of the vertical rib 78A, and the vertical rib 78C is bridged between the side wall portion 42B and the side wall portion 44B. An inclined rib (rib) 82 is connected between the vertical rib 78C and the vertical rib 78A and is also connected to the side wall portion 42B, and is inclined toward the lower side in the vehicle vertical direction toward the rear side in the vehicle longitudinal direction. Has been done. The inclined rib 82 is also connected to the side wall portion 42B and a lateral rib 80A described later.

On the other hand, of the lateral ribs 80, the lateral rib 80A located at the central portion of the rear floor side member central portion 52 in the vehicle vertical direction extends to the side wall portion 42B beyond the vertical rib 78B. The horizontal rib 80B located below the horizontal rib 80A extends from the side wall portion 42A to the side wall portion 42B to the side wall portion 42C of the rear floor side member rear portion 54, which will be described later. An inclined rib (rib) 84 that is connected to the vertical rib 78B and that inclines downward in the vehicle vertical direction as it goes to the rear side in the vehicle front-rear direction is provided between the horizontal ribs 80A and 80B. ing.

(Rear part of rear floor side member)
The rear floor side member rear portion 54 (the area from the front end 52A of the rear floor side member central portion 52 (boundary line P) to the front end 54A to the rear end 54B of the rear floor side member rear portion 54) will be described.

Vertical ribs 86 are provided on the rear portion 54 of the rear floor side member. The vertical rib 86 is bridged between the side wall portion 42C and the side wall portion 44C of the rear floor side member rear portion 54. Here, the vertical rib 86 is provided at a position that overlaps with the axial center line S of the above-mentioned suspension member mounting portion 57 in a vehicle side view. Further, vertical ribs 88 and 90 are provided on the front side and the rear side of the vertical rib 86, respectively. The vertical rib 88 is bridged between the side wall portion 42C and a horizontal rib 92 described later, and the vertical rib 90 is bridged between the side wall portion 42C and a horizontal rib 91 described later.

Further, in the rear floor side member rear portion 54, a plurality of horizontal ribs 92 are provided so as to be substantially orthogonal to the above-described plurality of vertical ribs 86, 88, 90. The lateral ribs 92 are partially formed 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. That is, the lateral ribs 92 are bridged between the side wall portion 44B of the rear floor side member central portion 52 and the side wall portion 42C of the rear floor side member rear portion 54. The horizontal ribs 91, 92 are formed so as to connect the vertical ribs 86, 88, 90 between the side wall portions 42C or the side wall portions 44C.

By the way, in the present embodiment, as described above, the rear floor side member 20 is formed by aluminum die casting, and the mold (not shown) for molding the rear floor side member 20 is formed in the vehicle width direction of the rear floor side member 20. It is configured to open along the mold. Although the rear floor side member 20 is molded by the mold and the mold is opened, the rear floor side member 20 is released from the mold. Therefore, although not shown, a movable part forming a part of the mold. Extrusion pins are provided on the mold side. The push-out pin contacts the rear floor side member 20 and presses the rear floor side member 20, whereby the rear floor side member 20 is released from the movable die.

Therefore, the rear floor side member 20 is provided with a push pin seat with which the push pin abuts. More specifically, in the present embodiment, a plurality of columnar push-out pin seats 93, 94, 96 are erected from the back wall portion 40 of the rear floor side member 20. The diameter of the push-out pin seats 93, 94, 96 is set to be thicker than the plate thickness of the vertical ribs 66, 78, the horizontal ribs 68, 80 and the like.

The push pin seat (thick portion) 93 includes at least the intersection of the vertical ribs 66A and 86 and the side wall portion 42, and the intersection of the other vertical ribs 66 and 78 or the horizontal ribs 68, 80 and 92 and the side wall portion 42. The push-out pin seat 93 and the side wall portion 42 are integrally formed.

The push pin seat (thick portion) 94 includes at least the intersection of the vertical ribs 66A and 86 and the side wall portion 44, and the intersection of the other vertical ribs 66 and 78 or the horizontal ribs 68, 72 and 92 and the side wall portion 44. The push-out pin seat 94 and the side wall portion 44 are integrally formed.

Further, the push-out pin seat 96 has a part of a plurality of intersections of the vertical ribs 66 and 70 and the horizontal rib 68, and a part of a plurality of intersections of the vertical ribs 78 and the horizontal rib 80. It is provided at the intersection, etc.

As described above, since the push-out pin seat 93 is integrally formed with the side wall portion 42 and the push-out pin seat 94 is integrally formed with the side wall portion 44, the push-out pin seats 93, 94 are the push-out pin seats. It is said to be thicker than 96.

Then, in the present embodiment, as shown in FIGS. 3 and 4, the vertical rib 66A of the vertical rib 66A connecting the push-pin seat 94 and the push-pin seat 96 on the side wall portion 44 side of the vertical rib 66A. When viewed from the plate thickness direction, there is provided a convex portion 98 that extends from the front end surface 94A of the push-out pin seat 94 and is formed in a convex shape in the direction in which the push-out pin seat 94 is erected. That is, on the ridgeline T of the vertical rib 66A, the protrusion 98 is provided on the push pin seat 94 side when viewed from the plate thickness direction of the vertical rib 66A.

On the other hand, in the present embodiment, the push pin seat 96 is formed lower than the push pin seat 94. Therefore, on the push pin seat 96 side of the vertical rib 66A, after the ridge line T extends linearly toward the push pin seat 94 including the tip surface 96A of the push pin seat 96, it is connected to the push pin seat 94 side. ing. When the heights of the pushing pin seat 96 and the pushing pin seat 94 are the same, the ridgeline T of the vertical rib 66A including the tip surface 94A of the pushing pin seat 94 and the tip surface 96A of the pushing pin seat 96 is the pushing pin. The convex portion 98 may be formed to extend substantially linearly on the seat 94 side.

Here, FIG. 3 is an enlarged perspective view of a main portion of the rear floor side member 20 in which a portion including the vertical rib 66A and the push pin seats 93 and 94 is enlarged. Further, in FIG. 4, the vertical ribs 66A, the push-out pin seats 93 and 94, and the suspension member mounting portion 55, which are main parts of the rear floor side member 20 when cut along the line AA shown in FIG. 2, are enlarged. It is a principal part expanded sectional view.

[Operation and effect of body structural member]
Next, the operation and effect of the vehicle body structural member according to the present embodiment will be described.

In this embodiment, the rear floor side member 20 shown in FIG. 2 is made of aluminum die cast. Generally, a die-cast member made of die-cast has a high degree of freedom in design, so it is formed so that the wall thickness is increased depending on the part to obtain high rigidity. However, if the wall thickness is increased, the vehicle weight increases. ..

Therefore, in the present embodiment, in the rear floor side member 20, the vertical ribs 66, 78, 86 and the like formed along the vehicle up-down direction between the side wall portion 42 and the side wall portion 44 that are provided so as to face each other and the vehicle. By providing the lateral ribs 68, 80, 92 and the like formed along the front-rear direction, the rear floor side member 20 is reinforced with a minimum necessary thickness.

Further, in the present embodiment, the diameters of the push pin seats 93, 94, 96 are set to be thicker than the plate thickness of the vertical ribs 66, 78, the horizontal ribs 68, 80 and the like. The push pin seat 93 is formed integrally with the side wall portion 42, and the push pin seat 94 is formed integrally with the side wall portion 44. Therefore, the push-out pin seats 93 and 94 are thicker than the push-out pin seats 96 arranged inside the push-out pin seats 93 and 94, that is, between the side wall portion 42 and the side wall portion 44.

Further, in the present embodiment, for example, as shown in FIG. 4, the plate of the vertical rib 66A on the side of the push pin 94 of the vertical rib 66A connecting the push pin seat 94 and the push pin seat 96 on the side wall portion 44 side. When viewed from the thickness direction, a protruding portion 98 is provided that is formed in a protruding shape in the direction in which the push pin seat 94 is erected.

As a comparative example, for example, as shown in FIGS. 6 and 7, in the rear floor side member 100, the push pin seat 102 is provided integrally with the side wall portion 101 and is located inside the push pin seat 102. In the rib 106 that connects the push-out pin seat 104, a case where an R-shaped recess 110 that is recessed toward the back wall 108 side is formed when viewed in the plate thickness direction of the rib 106 will be examined. 6 is an enlarged perspective view of an essential part corresponding to FIG. 3, and FIG. 7 is an enlarged sectional view of an essential part corresponding to FIG.

When the vehicle is running, a load is repeatedly input to the suspension mounting portion 112 of the rear floor side member 100 through wheels (not shown) and suspension members along the thickness direction (arrow direction) of the rear floor side member 100. In this case, as shown in FIG. 8, in the vicinity of the suspension mounting portion 112 of the rear floor side member 100, especially at the ridgeline T′ of the vertical rib 66A between the back wall portion 108 and the pushing pin seat 102, tensile stress or Compressive stress acts. As a result, at the ridgeline T′ of the vertical rib 66</b>A, a moment (M) acts from the recess 110 as a starting point, and the back wall 108 may be deformed via the rib 106. As a result, the displacement (deformation amount) of the rear floor side member 100 may increase.

Note that FIG. 8 is a cross-sectional view schematically showing the deformation of the rear floor side member 100 in the vicinity of the suspension mounting portion 112. Further, in FIG. 8, the state before deformation of the rear floor side member 100 is shown by a solid line, and the state after deformation is shown by a chain double-dashed line. The recess 110 is provided between the push pin seat 102 and the push pin seat 104 as shown in FIG. 8 except when the recess 110 is provided on the push pin seats 102 and 104 side, respectively. The case where it is provided large is included.

On the other hand, in the present embodiment, as described above, in the rear floor side member 20 shown in FIG. 4, the pushing pin seat 94 on the side wall portion 44 side and the pushing pin seat 96 located inside the pushing pin seat 94 are provided. On the push pin seat 94 side of the vertical rib 66</b>A that connects the vertical ribs 66</b>A, a convex portion 98 is provided when viewed in the plate thickness direction of the vertical rib 66</b>A. That is, in the present embodiment, on the push pin seat 94 side of the vertical rib 66A, when viewed from the plate thickness direction of the vertical rib 66A, a recess formed in a convex shape in the direction in which the push pin seat 94 is erected. 110 (see FIG. 7) is not formed.

Therefore, in the present embodiment, as compared with the case where the recess 110 (see FIG. 7) is formed on the push pin seat 94 side of the vertical rib 66A, the push pin seat 94 side of the vertical rib 66A is reinforced, The rigidity can be increased at least on the push pin seat 94 side of the vertical rib 66A.

Therefore, when the vehicle is traveling, a load is repeatedly applied to the suspension mounting portion 55 of the rear floor side member 20 along the thickness direction (arrow direction) of the rear floor side member 20, and as shown in FIG. Even if a tensile stress or a compressive stress acts on the ridgeline T of the vertical rib 66A between the wall portion 40 and the push pin seat 94, the rigidity is high on the push pin seat 94 side of the vertical rib 66A as described above. As a result, the deformation of the vertical rib 66A is suppressed.

That is, the vertical ribs 66A can bear a part of the tensile stress or the compressive stress. As a result, the deformation of the vertical ribs 66A can be suppressed, and the amount of deformation of the rear floor side member 20 can be reduced when the repeated load is input while the vehicle is traveling.

As described above, in the present embodiment, as shown in FIG. 5, the protrusion 98 is provided on the push pin seat 94 side of the vertical rib 66A when viewed from the plate thickness direction of the vertical rib 66A, whereby the rear floor side is provided. The amount of deformation of the member 20 can be reduced. As a result, the weight of the rear floor side member 20 can be ensured when reinforcing the rear floor side member 20.

Note that, in the present embodiment, as shown in FIG. 2, the vertical rib 66A provided at a position overlapping the axis R of the suspension mounting portion 55 in a vehicle side view has been described, but the axis S of the suspension mounting portion 57 is described. The same effect as the vertical rib 66A can be obtained also with respect to the vertical rib 86 provided at a position overlapping with the vehicle side view.

5 is a cross-sectional view schematically showing the deformation of the rear floor side member 20 in the vicinity of the suspension mounting portion 55. In FIG. 5, the state of the rear floor side member 20 before the deformation is shown by a solid line and after the deformation. The state of is indicated by a chain double-dashed line.

By the way, in this embodiment, in order to reinforce the vertical rib 66A, the vertical rib 66A is connected to the push-out pin seat 94. The push-out pin seat is an indispensable structure in terms of the mold structure, and as shown in FIG. 2, the push-out pin seats 93, 94, 96 are located at the intersections of the vertical ribs 66, 78 and the horizontal ribs 68, 80. It is provided. The diameter of the push-out pin seats 93, 94, 96 is set to be thicker than the plate thickness of the vertical ribs 66, 78, the horizontal ribs 68, 80 and the like. Therefore, by using the push-out pin seat 94 that is a thick portion to reinforce the vertical rib 66A, as compared with the case where a thick portion is separately provided to reinforce the vertical rib 66A, the rear floor side member 20 is provided. The weight can be reduced.

In addition, in the present embodiment, when reinforcing the rear floor side member 20, the protruding portion 98 is provided on the push pin seat 94 side of the vertical rib 66A when viewed from the plate thickness direction of the vertical rib 66A. For this reason, in the current die, the application in the present embodiment can be performed by cutting the portion corresponding to the convex portion 98, so that the current die can be used at the minimum necessary cost.

(Supplementary items of this embodiment)
In the present embodiment, the rear floor side member 20 is formed by aluminum die casting, 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 formed by casting. May be. Further, the rear floor side member 20 may be molded of fiber reinforced resin (FRP).

Further, in the present embodiment, the vertical rib 66A connects the push-out pin seat 94 and the push-out pin seat 96 on the side wall portion 44 side, but at least the push-out pin seat 94 side of the vertical rib 66A can be reinforced. Since it is good, the vertical rib 66A does not necessarily need to be connected to the push pin seat 96.

Further, in the present embodiment, the push-out pin seat 93 is integrally formed with the side wall part 42 and the push-out pin seat 94 is integrally formed with the side wall part 44, but the side wall parts 42, 44 are not always required. is not.

Further, in the present embodiment, in the rear floor side member 20 shown in FIG. 4, the push-out pin of the vertical rib 66A that connects the push-out pin seat 94 on the side wall portion 44 side and the push-out pin seat 96 located inside the push-out pin seat 94. Although the protrusions 98 are provided on the seat 94 side when viewed from the plate thickness direction of the vertical rib 66A, the protrusions 98 are extruded including the tip surface 94A of the extrusion pin seat 94 (not shown). A linear portion that is linearly formed in the direction away from the pin seat 94 may be provided.

Further, in the present embodiment, the protruding portion 98 is provided on the push pin seat 94 side of the vertical rib 66A when viewed from the plate thickness direction of the vertical rib 66A. However, not only the push pin seat 94 side but also the push pin seat 94 is provided. The convex portion 98 may be provided on the 93 side. Further, although not formed integrally with the side wall portions 42 and 44, the convex portion 98 may be provided on the side of the push pin seat 96.

Further, although the vertical rib 66A has been described in the present embodiment, from the viewpoint of reinforcing the rear floor side member 20, the vertical rib 66A is not limited to the vertical rib 66A, and other vertical ribs 66 and other vertical ribs 78, 86, and horizontal ribs. It may be applied to the ribs 68 and 80, the inclined ribs 74 and 76, and the like.

Further, in the present embodiment, the ridge line T of the vertical rib 66A is formed to include the tip surface 96A of the push pin seat 96 on the push pin seat 96 side of the vertical rib 66A, but the tip of the push pin seat 96 is not always required. It is not necessary to include face 96A. That is, the push pin seat 96 side may be formed to be connected to the back wall portion 40 side with respect to the tip end surface 96A. However, in this case, similarly to the push pin seat 94 side, although not shown, it is preferable that the convex portion is provided also on the push pin seat 96 side of the vertical rib 66A.

Furthermore, in the present embodiment, the rear floor side member 20 has been described, but the present invention is not limited to this as long as it is a vehicle body structural member.

Although an example of the 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 modifications may be appropriately combined and used. Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.

10 vehicle 20 rear floor side member (body structural member)
40 Back wall part (general part)
66 Vertical ribs
66A Vertical rib (rib)
68 Horizontal ribs
70 Vertical rib (rib)
72 Horizontal rib (rib)
74 Inclined rib (rib)
76 Inclined rib (rib)
78 Vertical rib (rib)
80 horizontal ribs
82 Inclined rib (rib)
84 Inclined rib (rib)
86 Vertical ribs
88 vertical ribs
90 vertical ribs
91 Horizontal rib (rib)
92 Horizontal ribs
93 Extruded pin seat (thick part)
94 Extruded pin seat (thick part)
94A Tip surface (tip surface of thick part)
98 convex

Claims (1)

A vehicle body structural member formed by a mold,
A general part constituting a main part of the vehicle body structural member,
A rib standing upright from the general portion,
A thick portion that is erected from the outer edge portion of the general portion, is connected to the rib, and is formed thicker than the rib,
A protrusion provided on the thick portion side of the rib and formed in a convex shape toward the direction in which the thick portion is erected when viewed from the plate thickness direction of the rib, or the tip of the thick portion A straight portion formed linearly in a direction away from the thick portion including a surface,
A vehicle body structural member configured to include.