JP7230766B2 - car body structural member - Google Patents

Description

The present invention relates to a vehicle body structural member.

Patent Literature 1 discloses a technique related to a side member formed by aluminum die casting. In the prior art described above, the rigidity of the side member is improved by providing the side member with ribs.

Japanese Patent No. 5606539

However, in the above prior art, depending on how the ribs are set, for example, the ribs intersect each other at an acute angle, considering the fluidity of the material during molding, a thick portion (hereinafter referred to as a It is necessary to provide a "meat pool"). In this case, the weight of the side member increases due to the provision of the meat pool.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body structural member capable of achieving weight reduction while ensuring necessary rigidity.

According to claim 1, the vehicle body structural member according to the present invention is a vehicle body structural member that extends along the vehicle front-rear direction, and is arranged along the vehicle front-rear direction and the vehicle width direction by connecting other members. It is provided on the front side or the rear side in the vehicle front-rear direction from the connecting portion to which a load along at least the vehicle front-rear direction and the vehicle vertical direction is input, and is upward in the vehicle vertical direction as it moves away from the connecting portion. a vertical wall portion inclined toward the side ; a lateral rib formed along the vehicle front-rear direction on the upper side of the connecting portion in the vehicle vertical direction; and a vertical rib formed along the vehicle vertical direction on the side of the vehicle, and a vertical rib formed along the vehicle front-rear direction on the connection portion side of the vertical wall portion, between the vertical rib, the connection portion, and the vertical wall portion. A wall portion connected to the vertical wall portion, the vertical rib, and the connecting portion by forming a concave shape with the vertical rib so that the angle formed by each of the above is not an acute angle, and the wall portion and the vertical wall portion and a first rib that bridges the longitudinal rib along the vehicle front-rear direction, and a second rib that bridges the connecting portion and the lateral rib along the vehicle vertical direction.

The vehicle body structural member according to the present invention described in claim 1 extends along the vehicle front-rear direction and includes a vertical wall portion, a horizontal rib, a vertical rib, a wall portion, a first rib, and a first rib . It has 2 ribs . The vertical wall portion is arranged in the vehicle front-rear direction and the vehicle width direction to which other members are connected, and is positioned further forward in the vehicle front-rear direction than the connection portion to which a load along at least the vehicle front- rear direction and the vehicle vertical direction is input. It is provided on the rear side and is inclined upward in the vertical direction of the vehicle as it moves away from the connecting portion . Further, the lateral rib is formed along the vehicle front-rear direction on the upper side of the connecting portion in the vehicle up-down direction, and the vertical rib is connected to the lateral rib and extends along the vehicle up-down direction on the upper side of the connecting portion in the vehicle up-down direction. formed by On the other hand, the wall portion is formed along the longitudinal direction of the vehicle on the connecting portion side of the vertical wall portion, and forms an acute angle with the vertical rib portion so that the angle between the wall portion and the connecting portion and the vertical wall portion is not acute. A concave shape is formed between the vertical wall portions, the vertical ribs and the connecting portions. Furthermore, the wall portion, the vertical wall portion, and the vertical rib are spanned along the vehicle longitudinal direction by the first rib, and the connecting portion and the lateral rib are spanned along the vehicle vertical direction by the second rib.

For example, a side member that supports a suspension member can be used as a vehicle body structural member that extends along the vehicle front-rear direction. The side member is provided with a connecting portion to which the suspension member is connected. When the vehicle is running, a load along at least the longitudinal direction and the vertical direction of the vehicle is input to the connecting portion.

In other words, a load along at least the longitudinal direction of the vehicle and the vertical direction of the vehicle is input to the side member via the connecting portion. Therefore, the area around the connecting portion of the side member is required to have a higher rigidity against the load along the vehicle front-rear direction and the vehicle vertical direction than other parts of the side member.

Therefore, in the present invention, in the vehicle body structural member as described above, a vertical wall portion is formed along the vehicle front-rear direction on the front side or rear side of the connecting portion in the vehicle front-rear direction, and the connecting portion is provided in the vehicle vertical direction. A vertical rib is formed along the vehicle vertical direction on the upper side of the . The vertical wall portion, the connecting portion, and the vertical rib form a concave shape with the vertical rib so that the angles formed with the vertical wall portion, the connecting portion, and the vertical rib are not acute angles . Connected.

As a result, it is possible to improve the rigidity around the connecting portion against loads along the vehicle longitudinal direction and the vehicle vertical direction . The load input to the connecting portion is transmitted along the vehicle longitudinal direction and the vehicle vertical direction by the wall portion, the vertical wall portion and the vertical rib .

Here, since the wall portion is formed closer to the connection portion than the vertical wall portion, the cross-sectional area of the connection portion including the vertical wall portion is smaller than when the wall portion is not formed. For this reason, although the rigidity of the connecting portion is considered to be low, the cross-sectional area of the connecting portion including the vertical wall portion is reduced. It becomes possible to secure the rigidity of the member.

On the other hand, the wall portion connects the vertical wall portion and the connecting portion on the connecting portion side of the vertical wall portion. That is, the wall portion is positioned between the vertical wall portion and the connecting portion. Further, the wall portion is connected to the vertical ribs in a concave shape. This makes it possible to prevent the angles formed between the vertical wall portion and the wall portion, between the wall portion and the connecting portion , and between the wall portion and the vertical rib from becoming acute angles.

For example, if the angle formed between the vertical wall and the wall is an acute angle, consider the fluidity of the material during molding of the vehicle body structural member, so that the vertical wall and the base of the wall are not thickened. The weight of the vehicle body structural member is increased by the amount of the padding.

On the other hand, in the present invention, as described above, the wall portion connecting the vertical wall portion and the connecting portion is provided closer to the connecting portion than the vertical wall portion , and the wall portion forms a concave shape between the vertical rib. By doing so , it is possible to prevent the angles formed between the vertical wall portion and the wall portion, between the wall portion and the connecting portion , and between the wall portion and the vertical rib from becoming acute angles. Accordingly, in the present invention, there is no need to provide the pool of meat, and the weight can be reduced accordingly.

Here, "along the vehicle front-rear direction" does not need to be completely along the vehicle front-rear direction, and may include a component in the vehicle front-rear direction. For example, directions along the vertical direction of the vehicle and the longitudinal direction of the vehicle are also included.

The vehicle body structural member according to claim 1 has the excellent effect of being able to achieve weight reduction while ensuring necessary rigidity.

1 is a plan view showing the rear portion of a vehicle lower portion provided with a rear side member to which a vehicle body structural member according to an embodiment of the present invention is applied; FIG. 1 is a side view of a rear side member to which a vehicle body structural member according to an embodiment of the present invention is applied, viewed from the outside in the vehicle width direction; FIG. 1 is a perspective view of a main portion of a rear side member to which a vehicle body structural member according to an embodiment of the present invention is applied, viewed from the inside in the width direction of the vehicle and the bottom side in the vertical direction of the vehicle; FIG. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. 2; It is a comparative example and is a perspective view corresponding to FIG. It is a comparative example and is a cross-sectional view corresponding to FIG.

A vehicle body structural member according to an embodiment of the present invention will be described. An arrow FR appropriately shown in each figure 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 simply referring to front/rear, left/right, and up/down directions, the front/rear direction of the vehicle, left/right of the left/right direction of the vehicle (vehicle width direction), and top/bottom of the vehicle up/down direction are referred to unless otherwise specified. do.

[Construction of car 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 shows a rear portion (hereinafter referred to as “vehicle rear portion”) 14 side of vehicle 10 in lower portion (hereinafter referred to as “vehicle lower portion”) 12 to which the 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 longitudinal direction of the vehicle are provided on the left and right sides of a side portion (hereinafter referred to as "vehicle side portion") 16 of the vehicle 10 . Each of the left and right rockers 18 has a closed cross-sectional shape when cut along a direction perpendicular to the longitudinal direction of the rocker 18 (vehicle vertical direction and vehicle width direction). It forms part of 16 skeletons.

Between the left and right rockers 18, a floor panel 24 is provided that extends along the vehicle front-rear direction and along the vehicle width direction and constitutes the floor surface of a vehicle interior (cabin) 22. The floor panel 24 extends along the vehicle width direction. are coupled to left and right rockers 18, respectively. A floor cross member 28 is arranged along the vehicle width direction between the left and right rockers 18 on the rear end side of the rocker 18 in the vehicle front-rear direction. attached above.

Rear floor side members (hereinafter referred to as “rear side members”) 20 extend in the vehicle front-rear direction on the rear sides of the left and right rockers 18 in the vehicle front-rear direction. Between the left and right rear side members 20 is a center floor positioned behind the floor panel 24 in the vehicle front-rear direction and extending along the vehicle front-rear direction and the vehicle width direction to form a floor surface on the rear side of the vehicle interior 22 . A panel 26 is provided. Both ends of the center floor panel 26 in the vehicle width direction are coupled to the left and right rear side members 20, respectively.

In addition, a floor cross member 30 is disposed along the vehicle width direction between the left and right rear side members 20 at the center portion 52 of the rear side member 20 in the vehicle front-rear direction. Bonded onto floor panel 26 .

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

A fuel tank 34 is arranged below the center floor panel 26 on the front portion 20A side of the left and right rear side members 20 in the longitudinal direction of the vehicle, that is, between the floor cross member 28 and the floor cross member 30 . . Suspension towers 36 and the like to which shock absorbers are attached are provided outside the left and right rear side members 20 in the vehicle width direction, although not shown.

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

<Rear side member>
Here, the rear side member 20 as a vehicle body structural member according to this embodiment will be described in detail. First, the basic configuration of the rear side member 20 will be described, and then the main part of the rear side member 20 will be described.

(Basic configuration of rear side member)
As shown in FIG. 1, the rear side member 20 is curved so as to protrude inward in the vehicle width direction in a plan view, and as shown in FIG. It is curved so as to protrude upward in the direction (so-called arched shape). 2 shows a side view of the rear side member 20 as seen from the inside in the vehicle width direction.

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

Briefly, the rear side member 20 includes a back wall portion (general portion) 40 constituting a main portion of the rear side member 20, an upper wall portion 42 standing from the upper edge of the back wall portion 40, A lower wall portion 44 standing from the lower edge of the inner wall portion 40 and facing the upper wall portion 42 is included.

Further, the rear side member 20 has an upper flange portion 46 extending upward from the tip of the upper wall portion 42 , and a lower flange portion 48 extending downward from the tip of the lower wall portion 44 . is served.

Further, as described above, the rear side member 20 has an arched shape that protrudes upward in the vehicle vertical direction when viewed from the side. are provided with suspension member attachment portions (hereinafter referred to as "suspension member attachment portions") 56 and 58, respectively, which are formed substantially horizontally along the longitudinal direction of the vehicle.

A front portion and a rear portion of a suspension member (not shown) are attached to the suspension attachment portions 56 and 58, respectively. The centerlines P and Q shown at the front portion 50 and the rear portion 54 of the rear side member 20 indicate the axis lines of the suspension mounting portions 56 and 58, respectively. Hereinafter, the center line P will be referred to as the "shaft core line P", and the center line Q will be referred to as the "shaft core line Q".

As shown in FIG. 1 , the front portion 50 of the rear side member 20 is connected to the rocker 18 extending in the vehicle front-rear direction at the vehicle side portion 16 . Note that the rocker 18 may have a configuration 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 side member 20 , a connecting portion 21 connected to the rocker 18 may be separately provided at the front portion 50 of the rear side member 20 .

(Main part of rear side member)
In the present embodiment, as shown in FIG. 2, the back wall portion 40 of the rear side member 20 has an upper wall portion 42 and a lower wall portion 44 that face each other in the vertical direction of the vehicle. A plate-like vertical rib 60 is formed along the . A plurality of vertical ribs 60 are arranged along the longitudinal direction of the vehicle. It is considered an interval.

In addition, the inner wall portions 40 of the front portion 50 and the rear portion 54 of the rear side member 20 are provided so as to bridge between an upper wall portion 42 and a lower wall portion 44 that intersect with the longitudinal ribs 60 and face the front and rear of the vehicle. A plate-like lateral rib 62 is formed along the front-rear direction. A plurality of lateral ribs 62 are arranged along the vertical direction of the vehicle. It is considered an interval.

In addition, as described above, the rear side member 20 has an arch shape. For this reason, in the inner wall portion 40 of the central portion 52 of the rear side member 20, a plate-like horizontal rib 64 is formed substantially along the vehicle front-rear direction so as to intersect with the plurality of vertical ribs 60 and connect the vertical ribs 60 . ing. A plurality of lateral ribs 64 are formed along the vertical direction of the vehicle, and the interval between the lateral ribs 64 that are adjacent to each other in the vertical direction of the vehicle is a predetermined interval that is preset in consideration of the center of gravity and rigidity of the rear side member 20 . It is said that

In the central portion 52 of the rear side member 20 , the vertical ribs 60 are radially formed around the center of curvature of the lower wall portion 44 . Therefore, on the front portion 50 side of the central portion 52 of the rear side member 20, the vertical ribs 60 extending along the vehicle front-rear direction and the vehicle vertical direction are spanned between the vertical ribs 60 adjacent to each other in the vehicle front-rear direction. A bridging angled rib 66 is provided. Further, on the side of the rear portion 54 of the central portion 52 of the rear side member 20, between the lateral ribs 64 adjacent to each other in the vertical direction of the vehicle, there is an inclination extending along the longitudinal direction of the vehicle and the vertical direction of the vehicle and bridging the lateral ribs 64. A rib 68 is provided.

That is, these vertical ribs 60, horizontal ribs 62, 64, and inclined ribs 66, 68 are set so as to be arranged in a well-balanced manner over the entire rear side member 20 according to the shape thereof.

On the other hand, when the vehicle is running, loads are repeatedly input to the suspension mounting portions 56 and 58 of the rear side member 20 along the longitudinal direction of the vehicle via wheels and suspension members (not shown). For this reason, the suspension mounting portions 56 and 58 are required to have high rigidity against loads that are input to the suspension mounting portions 56 and 58 . Here, the "vehicle longitudinal direction" is not limited to a direction completely along the vehicle longitudinal direction, and may include at least a vehicle longitudinal direction component.

Here, FIG. 3 shows a perspective view of the periphery of the suspension mounting portion 56 of the rear side member 20 as seen from the inside in the vehicle width direction and the lower side in the vehicle vertical direction. Since the suspension mounting portion 58 has substantially the same configuration as the suspension mounting portion 56, in the following description, the suspension mounting portion 56 side will be described as a representative of both.

As shown in FIGS. 2 and 3 , the suspension mounting portion 56 forms a part of the lower wall portion 44 of the rear side member 20 , and the lower wall portion 44 has more space than the suspension mounting portion 56 in the longitudinal direction of the vehicle. A downwardly inclined wall portion 70 is formed on the front side of the vehicle and is inclined downward in the vertical direction of the vehicle toward the front side in the longitudinal direction of the vehicle. Further, the lower wall portion 44 has an upwardly inclined wall portion (vertical wall) that is inclined upward in the vertical direction of the vehicle toward the rear side in the vehicle front-rear direction on the rear side of the suspension mounting portion 56 in the vehicle front-rear direction. part) 72 is formed.

A suspension member side attachment portion (not shown) is fixed to the suspension member attachment portion 56 via a bolt, and a boss 74 (see FIG. 4) is erected on the suspension attachment portion 56 toward the upper side. are set up. 4 shows a cross-sectional view taken along line AA in FIG. 2. As shown in FIG.

As shown in FIG. 3 , the upwardly inclined wall portion 72 is provided forward of the suspension mounting portion 56 and formed along the vehicle front-rear direction. Further, the upwardly inclined wall portion 72 is provided with a wall portion 76 that bends toward the suspension mounting portion 56 side from the upwardly inclined wall portion 72 .

The wall portion 76 is formed closer to the suspension mounting portion 56 than the upwardly inclined wall portion 72, as shown in FIG. The wall portion 76 connects the upwardly inclined wall portion 72 and the boss 74 of the suspension mounting portion 56 at a position where the separation distance L is small. The angle formed between the tangent line R and the wall portion 76 is approximately 90°. Furthermore, as shown in FIG. 3 , the upwardly inclined wall portion 72 and the wall portion 76 are bridged by ribs 78 .

Around the suspension mounting portion 56, a rib 80 is erected from the inner wall portion 40 toward the inside in the vehicle width direction. The rib 80 is arranged between the downwardly inclined wall portion 70 and the upwardly inclined wall portion 72, and includes a horizontal rib 82 formed along the vehicle front-rear direction, a vertical rib 84 formed along the vehicle vertical direction, and formed in a substantially L shape. Ribs 86 and 88 are formed around the boss 74 along the vertical direction of the vehicle so as to bridge the lateral rib 82 and the suspension mounting portion 56 .

By the way, in this embodiment, as described above, the rear side member 20 is formed by aluminum die casting, and a mold (not shown) for molding the rear side member 20 is formed along the vehicle width direction of the rear side member 20. configured to open.

In order to release the rear side member 20 from the mold after the rear side member 20 is molded by the mold and the mold is opened, the fixed mold side forming a part of the mold (not shown) is moved. is provided with push pins. The push pin abuts on the rear side member 20 and presses the rear side member 20, thereby releasing the rear side member 20 from the fixed mold. Therefore, the rear side member 20 is provided with an ejector pin seat with which the ejector pin abuts.

Specifically, in this embodiment, as shown in FIG. 2 , a plurality of columnar ejector pin seats 90 , 92 , 94 are erected from the inner wall portion 40 of the rear side member 20 . The ejector pin seat 90 is formed integrally with the upper wall portion 42 , and the ejector pin seat 92 is formed integrally with the lower wall portion 44 . On the other hand, the ejector pin seats 94 are provided at intersections of the vertical ribs 60 and the horizontal ribs 64 and the like. The diameters of the ejector pin seats 90, 92, 94 are set to be thicker than the plate thickness of the vertical ribs 60, the horizontal ribs 64, and the like.

[Actions and effects of car body structural members]
Next, the operation and effects of the vehicle body structural member according to this embodiment will be described.

In this embodiment, the rear side member 20 shown in FIG. 2 is made of die-cast aluminum. In general, die-cast members have a high degree of freedom in design, so they are formed to be thicker depending on the part so that high rigidity can be obtained, but increasing the thickness increases the weight of the vehicle. .

For this reason, in the present embodiment, in the rear side member 20, between the upper wall portion 42 and the lower wall portion 44 that are provided facing each other, vertical ribs 60, 86, etc., formed along the vehicle vertical direction and the vehicle front and rear ribs 60, 86, etc. By providing the lateral ribs 64, 92 and the like formed along the direction, the rear side member 20 is reinforced with the minimum necessary thickness.

As a result, in the present embodiment, the rigidity of the rear side member 20 itself is improved, and bending deformation of the rear side member 20 can be suppressed when a collision load is applied to the rear side member 20 along the longitudinal direction of the vehicle. It becomes possible.

Here, in the present embodiment, an upwardly inclined wall portion 72 is formed around the suspension mounting portion 56 on the rear side of the suspension mounting portion 56 in the longitudinal direction of the vehicle. A wall portion 76 that bends (is formed) toward the suspension mounting portion 56 side from the upwardly inclined wall portion 72 is provided.

As shown in FIG. 4, the wall portion 76 connects the upwardly inclined wall portion 72 and the boss 74 of the suspension mounting portion 56 at a position where the separation distance L becomes small. Furthermore, in this embodiment, as shown in FIG.

As described above, the suspension mounting portions 56, 58 provided on the rear side member 20 shown in FIG.

Therefore, in the present embodiment, in the rear side member 20 as described above, the upwardly inclined wall portion 72 in the vehicle front-rear direction is formed on the front side in the vehicle front-rear direction or the rear side in the vehicle front-rear direction of the suspension mounting portion 56 . A wall portion 76 connecting the upwardly inclined wall portion 72 and the suspension mounting portion 56 is provided.

This makes it possible to improve the rigidity around the suspension mounting portion 56 . The load input to the suspension mounting portion 56 is transmitted along the vehicle front-rear direction by the wall portion 76 formed along the vehicle front-rear direction and the upwardly inclined wall portion 72 . Here, in the present embodiment, the wall portion 76 is formed closer to the suspension mounting portion 56 than the upwardly inclined wall portion 72 is.

As a comparative example, for example, the wall portion 76 (see FIG. 3) is not formed in the upwardly inclined wall portion 102 shown in FIG. Compared with the upwardly inclined wall portion 102, the upwardly inclined wall portion 72 shown in FIG. The cross-sectional area of the mounting portion 56 is reduced. Therefore, it is considered that the rigidity of the suspension mounting portion 56 is lowered.

However, in the present embodiment, a rib 78 bridging the upwardly inclined wall portion 72 and the wall portion 76 is provided because the cross-sectional area of the suspension mounting portion 56 including the upwardly inclined wall portion 72 is reduced. Thereby, in this embodiment, the rigidity of the rear side member 20 can be ensured.

In other words, in the present embodiment, in the suspension mounting portion 56, the periphery of the suspension mounting portion 56 can be efficiently reinforced against the input in the longitudinal direction of the vehicle, and the force application point rigidity required in the suspension mounting portion 56 can be improved. It becomes possible to secure with a simple structure.

On the other hand, as shown in FIG. 4, the wall portion 76 connects the upwardly inclined wall portion 72 and the boss 74 of the suspension mounting portion 56 at a position where the separation distance L is small. The angle formed between the tangent line R of the outer peripheral surface 74A of the boss 74 of 56 and the wall portion 76 is approximately 90°.

As a comparative example, for example, as shown in FIG. Consider the case where they are crossed at an acute angle. In this case, in consideration of the fluidity of the material during molding of the rear side member 100, it is necessary to provide a thickening 112 (cross-hatched portion) at the root portion 110 of the upwardly inclined wall portion 102 and the wall portion 108. The weight of the rear side member 100 is increased by the provision of the meat pool 112 .

On the other hand, in the present embodiment, as shown in FIG. 4, the wall portion 76 connects the upwardly inclined wall portion 72 and the suspension mounting portion 56 at a position where the separation distance L is small. Therefore, the angle formed between the upwardly inclined wall portion 72 and the wall portion 76 is not an acute angle. For this reason, there is no need to provide the pool of meat, and the weight can be reduced accordingly. The angle formed between the tangent line R of the outer peripheral surface 74A of the boss 74 of the suspension mounting portion 56 and the wall portion 76 need not be an acute angle, and thus does not necessarily need to be substantially 90°.

By the way, as described above, the rear side member 20 is removed from the rear wall portion 40 of the rear side member 20 shown in FIG. A plurality of ejector pin seats 90, 92, and 94 are erected against which the ejector pins to be pressed come into contact.

In the comparative example, for example, as shown in FIG. 6, the upwardly inclined wall portion 102 is not provided with the wall portion 76 (see FIG. 4) that bends from the upwardly inclined wall portion 102 toward the suspension mounting portion 104 side. . In this case, the height of the upwardly inclined wall portion 102 is increased. That is, the depth of the inner wall portion 112 is increased. As a result, the height of the ejector pin seat 114 is increased, and considering the rigidity of the ejector pin seat 114, the thickened portion 112 for reinforcing the ejector pin seat 114 is required at the root portion of the ejector pin seat 114. becomes.

In contrast, in the present embodiment, as described above, in the upwardly inclined wall portion 72 formed around the suspension mounting portion 56 , the wall portion 76 is bent toward the suspension mounting portion 56 side from the upwardly inclined wall portion 72 . is provided to connect the upwardly inclined wall portion 72 and the boss 74 of the suspension mounting portion 56 . Therefore, the height of the upwardly inclined wall portion 72 is reduced by the amount of the wall portion 76 formed. That is, the depth of the inner wall portion 40 becomes shallow.

Therefore, in the present embodiment, the height of the ejector pin seat 92 is lower than in the comparative example, and the thickened portion 112 (see FIG. 6) at the root portion of the ejector pin seat 92 is not required. Therefore, the weight of the rear side member 20 can be reduced by the amount corresponding to the elimination of the thickened portion 112 .

As described above, in the present embodiment, the rear side member 20 can achieve weight reduction while ensuring necessary rigidity.

(Supplementary matter of this embodiment)
In this embodiment, the rear side member 20 is made of die-cast 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. good too. Furthermore, the rear side member 20 may be molded from fiber reinforced resin (FRP).

Further, in the present embodiment, the rear side member 20 has an arch shape that curves along the vehicle up-down direction, but may be curved along the vehicle width direction to form an arch shape. It is not necessary to form an arch shape.

Furthermore, in the present embodiment, the rear side member 20 has been described as an example of the vehicle body structural member, but the vehicle body structural member in the present invention is not limited to the rear side member 20 . For example, although not shown, it may be applied to a front side member provided in the front part of the vehicle, or may be applied to other vehicle body structural members.

An example of the embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above. It goes without saying that various aspects can be implemented without departing from the gist of the above.

10 vehicle 20 rear side member (body structural member)
56 suspension mounting part (connecting part)
58 suspension mounting part (connecting part)
72 upward slope wall (vertical wall)
76 wall portion 78 rib

Claims (1)

A vehicle body structural member extending along the longitudinal direction of the vehicle,
It is provided on the front side or the rear side in the vehicle front-rear direction of the connection portion to which other members are connected and arranged along the vehicle front-rear direction and the vehicle width direction and to which loads are input at least along the vehicle front-rear direction and the vehicle vertical direction. , a vertical wall portion that slopes upward in the vertical direction of the vehicle as it moves away from the connecting portion ;
a lateral rib formed along the vehicle front-rear direction on the upper side of the connection portion in the vehicle vertical direction;
a vertical rib connected to the lateral rib and formed along the vehicle vertical direction on an upper side of the connecting portion in the vehicle vertical direction;
It is formed along the vehicle front-rear direction on the connecting portion side of the vertical wall portion, and is aligned with the vertical rib so that the angles formed by the vertical rib, the connecting portion, and the vertical wall portion are not acute angles. a wall portion forming a concave shape between and connected to the vertical wall portion, the vertical rib and the connecting portion ;
a first rib that bridges the wall portion, the vertical wall portion, and the vertical rib along the vehicle front-rear direction;
a second rib that bridges the connecting portion and the lateral rib along the vehicle vertical direction;
A vehicle body structural member having a

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