JP2020093572A - Vehicle body structure - Google Patents

Abstract

To provide a vehicle body structure that can obtain a high energy absorption efficiency in a wide range in the front to back direction of a vehicle body while preventing the weight of the vehicle body from being increased in the context of a side collision of a vehicle.SOLUTION: A vehicle body structure 10 includes: a pair of frame members 22 extending in the front to back direction; plural cross members 24, both ends of which are connected to the pair of frame members; and a load transmission member 30. The load transmission member protrudes outward from the frame member and extends in the front to back direction of the vehicle body. The load transmission member includes on the surface: first load transmission edge line portions 1A, 1B and second load transmission edge line portions 5 each formed between the adjacent first load transmission edge line portions. The first load transmission edge line portions are formed in a pair of linear portions in top view. Each of inner end portions 1c of the first load transmission edge line portions in the vehicle width direction protrudes to be opposed to a connection portion 24 between the cross member 24 and the frame member. The second load transmission edge line portion is formed substantially in a circular arc shape in top view to be convexed outward in the vehicle width direction, and either end of the second load transmission edge line portion is overlapped with the inner end portion.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle body structure applied to a vehicle such as an automobile.

BACKGROUND ART Conventionally, when a side surface of a vehicle such as an automobile collides with an object, for example, when a so-called pole collision occurs in which the vehicle laterally collides with a pillar or the like on the road, a collision load is applied by a load transmission member provided on a side portion of the vehicle body. A vehicle body structure has been developed that is transmitted to and dispersed in another vehicle body structure to protect an occupant and prevent damage to a battery module mounted on the vehicle.

As a vehicle body structure considering a side collision of a vehicle, for example, Patent Document 1 describes a structure in which an outrigger which is a load transmitting member for transmitting a collision load at the time of a side collision is provided on a side portion of the vehicle body. ..

This vehicle body structure has a pair of frame members extending in the vehicle front-rear direction, a plurality of cross members extending between the pair of frame members in the vehicle width direction, and a pair of frame members extending in the vehicle front-rear direction outside the vehicle width direction. Side sill and a plurality of outriggers arranged between the frame member and the side sill. Both ends of each of the cross members are connected to the pair of frame members. The outriggers are plate-shaped members extending in the vehicle width direction, are arranged on both sides of each cross member in the vehicle width direction, and extend on the extension line of the cross member. Both ends of the outrigger are connected to the side frame and the side sill, respectively. In this vehicle body structure, the collision load input to the side sill on the vehicle body side can be transmitted to the cross member via the outrigger.

JP, 2004-276904, A

In the vehicle body structure described in Patent Document 1, when a collision target collides with a position facing the outrigger in the vehicle width direction, the collision load is extended along the length direction of the outrigger (that is, the vehicle width direction). It can be transmitted to the cross member on the line, and high energy absorption efficiency can be obtained.

However, when a collision object collides between two outriggers arranged at intervals in the front-rear direction of the vehicle body, the load input position and the outrigger arrangement position are displaced in the front-rear direction, so that the load transmission to the cross member occurs. If not enough, the energy absorption efficiency will decrease and the load on the occupant will increase. Further, if the number of cross members or outriggers is increased in order to avoid such a situation, there is a problem that the vehicle body weight increases.

The present invention has been made in view of the above problems, and provides a vehicle body structure capable of obtaining high energy absorption efficiency in a wide range in the vehicle longitudinal direction while suppressing an increase in the weight of the vehicle body with respect to a side collision of the vehicle. Especially.

In order to achieve the above-mentioned object, the invention according to claim 1 has a pair of frame members which are arranged at intervals in the vehicle width direction and extend in the vehicle body front-rear direction, and both ends of which are connected to the pair of frame members. In a vehicle body structure including a plurality of cross members extending in the vehicle width direction and a load transmission member fixed to the frame member, the load transmission member protrudes outward from the frame member in the vehicle width direction and Direction, and is installed so as to extend to the connecting portion of the plurality of cross members that are arranged at intervals in the front-rear direction of the vehicle body to the frame member, and the surface thereof corresponds to each of the plurality of cross members. The first load transmission ridgeline portion has a formed first load transmission ridgeline portion and a second load transmission ridgeline portion formed between the first load transmission ridgeline portions adjacent to each other in the vehicle body front-rear direction. The parts are formed in a pair of linear shapes that are separated from each other from the inner side in the vehicle width direction toward the outer side in a top view, and the inner ends on the inner side in the vehicle width direction are connected to the corresponding cross member and the frame member. The second load transmitting ridge line portions are butted with each other with or without the frame member interposed therebetween. The second load transmission ridge line portion has a substantially arc shape that is convex outward in the vehicle width direction in a top view, and both end portions thereof are , The first load transmitting ridge line portion and the inner end portion of the first load transmitting ridge line portion are overlapped with each other.

According to this configuration, no matter where the collision load is input from the load transmission member extending in the front-rear direction of the vehicle body, the collision load is applied to the load via the first load transmission ridgeline portion and/or the second load transmission ridgeline portion. Can be transmitted to cross members. This makes it possible to obtain high energy absorption efficiency in a wide range in the front-rear direction of the vehicle body against a side collision. Further, since the collision load can be appropriately transmitted by forming the first and second load transmission ridges on the surface of the load transmission member, it is possible to suppress an increase in weight of the entire vehicle body structure.

The invention according to claim 2 is the vehicle body structure according to claim 1, wherein the outermost apex of the second load transmitting ridgeline portion in the vehicle width direction is the vehicle width of the first load transmitting ridgeline portion. It is characterized in that it is located on the inner side in the vehicle width direction than the outer end portion on the outer side in the direction.

According to this configuration, the collision load input between the first load transmission ridges adjacent to each other in the vehicle body front-rear direction can be transmitted to the two cross members via the second load transmission ridges. High energy absorption efficiency can be obtained.

According to a third aspect of the present invention, in the vehicle body structure according to the first or second aspect, a plurality of wall members arranged within a closed cross section of the frame member are provided, and the first load transmission ridge line portion is provided. The inner end portions are abutted against each other through a connecting portion between the corresponding cross member and the frame member and the frame member in a top view, and each of the plurality of wall members is in a top view. It is characterized in that it extends in the vehicle width direction so as to connect the connecting portion and the inner end portion of the first load transmitting ridge line portion.

According to this structure, the collision load transmitted from the load transmitting member to the cross member via the frame member can be efficiently transmitted from the load transmitting member to the cross member via the wall member in the frame member.

The invention according to claim 4 is characterized in that, in the vehicle body structure according to any one of claims 1 to 3, the load transmission member has a closed cross section.

According to this configuration, it is possible to suppress the deformation of the load transmission member at the time of a side collision and appropriately transmit the collision load input to the load transmission member to the cross member.

According to the vehicle body structure of the present invention, it is possible to obtain a high energy absorption efficiency in a wide range in the front-rear direction of the vehicle body while suppressing an increase in the weight of the vehicle body with respect to a side collision of the vehicle.

1 is a perspective view showing a vehicle body structure that is an embodiment of the present invention. The top view of a vehicle body structure. Sectional drawing which follows the AA line of FIG. Sectional drawing which follows the BB line of FIG. 1A is an end view taken along the line CC of FIG. 1, and FIG. 1B is an end view taken along the line DD of FIG. The top view which shows another embodiment of the vehicle body structure which concerns on this invention. The top view which shows another embodiment of the vehicle body structure which concerns on this invention.

1 is a perspective view showing a vehicle body structure according to an embodiment of the present invention, FIG. 2 is a top view of the vehicle body structure, and FIG. 3 is a sectional view taken along the line AA of FIG. The vehicle body structure 10 according to the present invention is applied to a vehicle such as an automobile. In the present embodiment, the vehicle body structure 10 applied to an electric vehicle including a battery housing structure 20 in which a battery module BT is mounted will be described. 1 and 2, the battery accommodating structure 20 and the load transmitting member 30 fixed to the battery accommodating structure 20 are illustrated, and the other vehicle body structures illustrated in FIG. 3 are omitted. Further, the illustration of the battery module BT is omitted in FIG.

In each drawing, the arrow Fr indicates the front side of the vehicle body, and the arrow Rr indicates the rear side of the vehicle body. The arrow L indicates the left side of the vehicle body, and the arrow R indicates the right side of the vehicle body. An arrow U indicates the upper side of the vehicle body, and an arrow D indicates the lower side of the vehicle body. The vehicle body structure 10 is configured substantially symmetrically with respect to a center line extending in the vehicle front-rear direction through the center of the vehicle width direction, and in the illustrated example, only the left side portion of the vehicle body structure 10 is shown. There is.

In the vehicle body structure 10, the battery housing structure 20 includes a pair of left and right battery side frames (frame members) 22 extending in the vehicle front-rear direction, a bottom panel 21, a plurality of lower cross members (cross members) 24, and a plurality of lower side cross members (cross members) 24. The upper cross member 26 and the battery module BT are provided. In the following description, the battery side frame 22 is simply referred to as “side frame 22”. The load transmitting member 30 is fixed to the side frame 22 and projects outward from the side frame 22 in the vehicle width direction and extends in the vehicle front-rear direction (hereinafter, also simply referred to as “front-rear direction”). The load transmitting member 30 has a first load transmitting ridgeline portion extending linearly and a second load transmitting ridgeline portion extending substantially arcuate on the surface. As will be described later, the first and second load transmitting ridge portions are formed by bending portions formed by bending the panel member, and are formed in a linear shape capable of transmitting the collision load.

The pair of side frames 22 are arranged on the left and right of the vehicle body at intervals in the vehicle width direction and extend substantially parallel to the front-rear direction. As shown in FIG. 3, the side frame 22 is a tubular structure having a quadrangular cross section, and includes an inner wall 22a located on the inner side in the vehicle width direction, an outer wall 22b located on the outer side in the vehicle width direction, an inner wall 22a, and The upper wall 22c connects the upper ends of the outer walls 22b, and the bottom wall 22d connects the lower ends of the inner wall 22a and the outer wall 22b.

In the present embodiment, the side frame 22 includes an upper frame panel 51 having a substantially L-shaped cross section forming the inner wall 22a and the upper wall 22c, and a lower frame panel 53 having a substantially L-shaped cross section forming the outer wall 22b and the bottom wall 22d. And the flange portions 52 and 54 at both side edges of the upper frame panel 51 and the lower frame panel 53 are joined to each other to form a closed cross section.

Inside the side frame 22, a wall member 23 extending in the vehicle width direction is arranged so as to close at least a part of the closed cross section. One end 23a of the wall member 23 is in contact with the inner surface of the inner wall 22a of the side frame 22, and the other end 23b is in contact with the inner surface of the outer wall 22b of the side frame 22. As shown in FIG. 2, the plurality of wall members 23 are arranged in the side frame 22 so as to be located on the extension lines of the front wall 26 a and the rear wall 26 b of each upper cross member 26.

The bottom panel 21 is a floor surface portion on which the battery module BT formed of a substantially flat panel member is mounted, is installed between the pair of side frames 22, and extends substantially horizontally in the vehicle body front-rear direction.

The lower cross member 24 is attached to the upper surface of the bottom panel 21, extends between the pair of side frames 22 in the vehicle width direction, and as shown in FIG. 1 and FIG. It is arranged. Both ends of the lower cross member 24 in the vehicle width direction are connected to the inner walls 22a of the left and right side frames 22. As shown in FIG. 4, the lower cross member 24 is formed of a panel having a hat-shaped cross section with an opening at the bottom, and includes a front wall 24a located on the front side of the vehicle body, a rear wall 24b located on the rear side of the vehicle body, It has an upper wall 24c connecting the upper ends of the front wall 24a and the rear wall 24b, and a flange portion 24d joined to the bottom panel 21.

The upper cross member 26 is installed above each lower cross member 24. As shown in FIGS. 1 and 2, the upper cross member 26 extends between the pair of side frames 22 in the vehicle width direction, and both ends thereof are connected to the inner walls 22a of the left and right side frames 22.

As shown in FIG. 4, the upper cross member 26 of the present embodiment has a rectangular cross section, and has a front wall 26a located on the front side of the vehicle body, a rear wall 26b located on the rear side of the vehicle body, a front wall 26a, and The upper wall 26c connects the upper ends of the rear wall portions 26b, and the bottom wall 26d connects the lower ends of the front wall 26a and the rear wall 26b. The upper cross member 24 further has a cylindrical leg portion 25 projecting downward from the bottom wall 26d, and a plurality of leg portions 25 are provided at intervals in the length direction of the upper cross member 26. .. Each leg 25 is fixed to the upper wall 24c of the lower cross member 24.

The battery module BT is a housing that accommodates a battery that serves as a power source of the electric vehicle, and in the present embodiment, is disposed between a plurality of upper cross members 24 and a plurality of lower cross members 26 that are arranged at intervals in the front-rear direction. Each is arranged.

As shown in FIG. 3, the vehicle body structure 10 further extends in the vehicle width direction between a pair of left and right side sills 14 extending in the front-rear direction, a floor panel 15 installed on the pair of side sills 14, and a pair of side sills 14. The seat cross member 16 and a pair of left and right floor side frames 12 that extend in the front-rear direction inside the pair of side sills 14 in the vehicle width direction are provided.

The pair of side sills 14 are located on both sides of the lower portion of the floor panel 15 in the vehicle width direction and extend in the front-rear direction. The side sill 14 is a tubular structure having a closed cross section formed by joining the respective flange portions 72, 74 of the inner panel 71 and the outer panel 73 having a hat-shaped cross section to each other.

The floor panel 15 is a floor surface portion of a vehicle formed by pressing a steel plate, is arranged above the battery housing structure 20 so as to cover it, and extends substantially horizontally in the front-rear direction of the vehicle body.

The seat cross member 16 is arranged above the floor panel 15. Although only one seat cross member 16 is shown in FIG. 3, a plurality of seat cross members 16 are installed at intervals in the front-rear direction. The seat cross member 16 has a substantially rectangular closed cross section, and both ends of each seat cross member 16 are connected to the inner panel 71 of the side sill 14.

The pair of floor side frames 12 are attached to a lower portion of the floor panel 15, and are arranged inside the pair of side sills 14 in the vehicle width direction with a space therebetween in the vehicle width direction. The side frame 12 has a hat-shaped cross section, and is formed to have a substantially closed cross section by joining the flange portion to the lower surface of the floor panel 15. The bottom wall 12a of the floor side frame 12 is fixed to the upper wall 22c of the side frame 22 with fixing means 62 such as a long bolt in a state of being in surface contact with the upper wall 22c.

The load transmission member 30 is arranged between the side frame 22 and the side sill 14, and as shown in FIG. 3, the side edge portion of the load transmission member 30 on the inner side in the vehicle width direction is fixed by the fixing means 62. Is fixed to the lower surface of the side sill 14 by a fixing means 66 such as a long bolt. Further, a connection member 29 that connects the side frame 22 and the side sill 14 is arranged above the load transmission member 30. The connecting member 29 has an L-shaped cross section and extends in the vehicle front-rear direction. One side of the L-shape is joined to the inner panel 71 of the side sill 14, and the other side of the L-shape is attached to the side frame by the fixing means 64. It is fixed to the flange portions 53 and 54 of 22. 1 and 2, the connection member 29 and the long bolts that are the fixing means 62, 64, 66 are omitted, and only the through holes of each member into which these long bolts are inserted are shown. The positions of the fixing means 62, 64, 66 are shown by imaginary lines.

As shown in FIG. 2, the load transmission member 30 projects outward from the side frame 22 in the vehicle width direction, extends in the vehicle front-rear direction, and further includes a plurality of lower cross members 24 and a plurality of lower cross-members 24 arranged side by side in the front-rear direction. The upper cross member 26 is installed so as to extend to the connecting portions 24e, 26e of the side frame 22. In the present embodiment, three lower cross members 24 and three upper cross members 26 are arranged in the front-rear direction, but the number of each cross member 24, 26 may be two or more. The load transmitting member 30 preferably extends over the entire area of the battery housing structure 20 in the front-rear direction.

As shown in FIGS. 1 and 2, the load transmission member 30 includes an outer edge 30a that linearly extends in the vehicle width direction outside in the vehicle width direction and an inner edge that extends in the vehicle width direction inside in the vehicle length direction in a top view. It is a relatively thin member surrounded by 30b, a front side edge 30c connecting the front ends of the outer edge 30a and the inner edge 30b, and a rear side edge 30d connecting the outer edges 30a and the rear ends of the inner edges 30b. A plurality of substantially arcuate notches 6 (two in the illustrated example) are formed on the inner edge 30b in the vehicle width direction so as to project outward in the vehicle width direction, and the protrusions between the notches 6 are formed. As shown in FIG. 3, the thin fixing portion 35 is fixed to the bottom wall 22d of the side frame 22 by the fixing means 62.

The load transmission member 30 of the present embodiment has a lower panel 31 and an upper panel 32, and a plurality of upper panels 32 are arranged so as to correspond to each lower cross member 24.

The lower panel 31 is a substantially flat plate-shaped panel member that forms the outer edge 30a, the inner edge 30b, the front edge 30c, and the rear edge 30d of the load transmission member 30, and has a small unevenness. It has an arc-shaped ridge line portion 5 which is a part. Hereinafter, this ridge line portion 5 is referred to as an arc-shaped ridge line portion 5.

The arcuate ridge line portions 5 are formed at intervals radially outside the notch 6 so as to form a double arc with the notch 6. The arcuate ridge line portion 5 constitutes an arc-shaped second load transmitting ridge line portion for transmitting a collision load.

As shown in FIGS. 1 and 5A and 5B, each upper panel 32 is joined to the upper surface of the lower panel 31, and is bent in an uneven shape so as to form a closed cross section together with the lower panel 31. Specifically, as shown in FIG. 5, the upper panel 32 includes a flange portion 33a joined to the lower panel 31 and a first wall portion 32a rising upward from the flange portion 33a in this order from the front side of the vehicle to the rear side. , A first top surface portion 32b that is bent from the upper end of the first wall portion 32a and extends rearward of the vehicle body, a second wall portion 32c that is bent and extends downward from the rear end of the first top surface portion 32b, and a lower end of the second wall portion 32 A bottom surface portion 32d that bends from the bottom surface and extends substantially horizontally to the rear of the vehicle body and is joined to the lower panel 31, a third wall portion 32e that rises upward from a rear end of the bottom surface portion 32d, and a top portion of the third wall portion 32e. A second top surface portion 32f extending rearward of the vehicle body, a fourth wall portion 32g bent from a rear end of the second top surface portion 32f and extending downward, and a flange bent from the fourth wall portion 32g and joined to the lower panel 31. It has a portion 33b.

As shown in FIGS. 3 and 5A and 5B, the closed cross section formed by the lower panel 31 and the upper panel 32 is formed such that the cross-sectional area becomes wider from the outer side toward the inner side in the vehicle width direction. Preferably. In this embodiment, the height of the closed cross section is larger on the inner side than on the outer side in the vehicle width direction.

As shown in FIGS. 1 and 2, the bent portion between the first wall portion 32a and the first top surface portion 32b of the upper panel 32 and the bent portion between the fourth wall portion 32g and the second top surface portion 32f are In a top view, a pair of linear ridge portions 1A and 1B are formed which are separated from each other from the inner side to the outer side in the vehicle width direction. Hereinafter, the ridgeline portions 1A and 1B are referred to as first linear ridgeline portions 1A and 1B. The first linear ridge line portions 1A and 1B form a first load transmission ridge line portion that transmits a collision load.

Further, in the present embodiment, as shown in FIGS. 1, 2 and 5, the bent portion between the first top surface portion 32b and the second wall portion 32c of the upper panel 32, the second top surface portion 32f, and the third top surface portion 32f. The bent portion between the wall portions 32e forms a pair of linear ridge line portions 3A and 3B that are separated from each other from the inner side to the outer side in the vehicle width direction in a top view. Hereinafter, the ridgeline portions 3A and 3B are referred to as second linear ridgeline portions 3A and 3B. The second linear ridge line portions 3A and 3B form ridge lines that transmit a collision load to the upper cross member 26 when the vehicle has a side collision.

Next, the positional relationship between the first linear ridge line portions 1A and 1B that are the first load transmission ridge line portions and the arc-shaped ridge line portion 5 that is the second load transmission ridge line portion will be described.

As shown in FIG. 2, in a top view, both end portions 5c of the arc-shaped ridge line portion 5 are formed by inner end portions 1c (that is, the inner end portions 1c) of the first linear ridge line portions 1A and 1B that are adjacent to each other in the vehicle front-rear direction. The first linear ridgeline portion 1B on the front side of the vehicle body and the inner end portions 1c) of the first linear ridgeline portion 1A on the rear side of the vehicle body overlap each other.

Further, in a top view, the outermost apex portion 5a of the arc-shaped ridgeline portion 5 is located on the inner side in the vehicle widthwise direction than the outer end portion 1d of the first linear ridgeline portions 1A and 1B on the outer side in the vehicle widthwise direction. doing.

Next, the positional relationship between the first load transmission ridge line portion and the second load transmission ridge line portion and the lower cross member 24 will be described.

As shown in FIG. 2, the inner ends 1c of the pair of first linear ridge portions 1A and 1B are respectively connected to the side frames 22 of the front wall 24a and the rear wall 24b of the lower cross member 24 in a top view. Are joined to each other via the side frame 22 (that is, with a gap of the side frame 22 in plan view).

Further, in a top view, both end portions 5c of the arc-shaped ridge line portion 5 are connected to the rear wall 24b of the lower cross member 24 and the front wall 24a of the lower cross member 24 adjacent to the lower wall portion 24e, respectively, to be connected to the side frames 22. , But the side frame 22 is not interposed (that is, the connecting portion 24e and the both end portions 5c are continuous with each other in a top view).

Further, the inner end portions 3c of the pair of second linear ridge portions 3A and 3B on the inner side in the vehicle width direction are respectively attached to the side frames 22 of the front wall 26a and the rear wall 26b of the upper cross member 26 in a top view. Are abutted against each other via the connecting part 26e of the side frame 22 (that is, with a gap of the side frame 22 in top view). The wall member 23 in the side frame 22 extends in the vehicle width direction so as to connect the connecting portion 26e and the inner end portion 1c in a top view.

Next, the operation and effect of the vehicle body structure 10 described above will be described.

When an automobile including the vehicle body structure 10 collides sideways and receives a collision load from the left side, that is, when the collision load inward in the vehicle width direction is input to the side sill 14 and the outer edge 30a of the load transmission member 30 in the illustrated example, The collision load is transmitted to the side frame 22 via the load transmission member 30.

At this time, when the collision object collides with a position facing the ends of the lower cross member 24 and the upper cross member 26 in the vehicle width direction, the load transmission member 30 is broken and deformed by the collision load, and the collision direction is also generated. The collision load is transmitted to the lower cross member 24 and the upper cross member 26 along the vehicle width direction. As a result, the load can be transmitted to the right side portion of the vehicle, which is the non-collision side, to absorb energy, and high energy absorption efficiency can be obtained. Further, the collision stroke can be secured by breaking and deforming the load transmission member 30 at the time of collision. As a result, it is possible to reduce the load on the occupant and prevent the battery module BT from being destroyed.

Further, in the present embodiment, the collision load can be transmitted to the front wall 26a and the rear wall 26b of the upper cross member 26 along the second linear ridgeline portions 3A and 3B, so that the energy absorption efficiency is further improved. Further, by disposing the wall member 23 in the side frame 22, it is possible to further improve the load transmission efficiency from the second linear ridgeline portions 3A and 3B to the upper cross member 26.

On the other hand, when the collision object collides between the lower cross member 24 and the upper cross member 26 that are adjacent to each other in the front-rear direction, the load transmission member 30 is destroyed and deformed by the collision load, and the position between these cross members is increased. The collision load can be transmitted to the rear wall 24b of the lower cross member 24 on the front side of the vehicle body along the first linear ridge line portion 1B on the front side of the vehicle body. The collision load can be transmitted to the front wall 24a of the lower cross member 24 on the vehicle body rear side along 1A. Accordingly, even if the load input position and the arrangement positions of the lower cross member 24 and the upper cross member 26 deviate in the front-rear direction, high energy absorption efficiency can be obtained. Further, the collision stroke can be secured by breaking and deforming the load transmission member 30 at the time of collision. As a result, it is possible to reduce the load on the occupant and prevent the battery module BT from being destroyed.

Further, by inputting the collision load to the arc-shaped ridge line portion 5, the collision load is transmitted to the two lower cross members 24 and the two upper cross members 26 arranged in the front-rear direction along the arc-shaped ridge line portion 5. The energy absorption efficiency can be further improved. Moreover, by adopting a configuration in which the load is dispersed into a plurality of parts, it is possible to suppress an increase in the mass of the load transmission member 30 itself and to reduce the weight. Further, by forming the cutout portion 6 in the load transmission member 30, it is possible to further reduce the weight.

Further, since the load transmission member 30 has a closed cross section in the formation portion of the first and second linear ridge portions 1A, 1B and 3A, 3B, crushing is suppressed and the collision load is appropriately applied to the lower cross member 24. And can be transmitted to the upper cross member 26. Further, since the area of the closed cross section increases from the outer side to the inner side in the vehicle width direction, the area of the closed cross section is small and it is possible to crush in order from the outer side to the inner side in the vehicle width direction, which easily collapses. In addition, in the portion where the closed cross section is not formed in the load transmitting member 30, it is possible to promote the breakage of the load transmitting member 30 and secure the collision stroke.

Next, another embodiment of the vehicle body structure 10 according to the present invention will be described with reference to FIGS. 6 and 7.

In the vehicle body structure 10 of the embodiment shown in FIG. 6, a plurality of lower cross members 24 extending in the vehicle width direction are installed between the pair of side frames 22, and an upper cross member 26 is not installed. Further, the load transmission member 30 is formed of one panel 34 and does not have a closed cross section. On the surface of the load transmission member 30, a pair of linear ridge line portions 2A and 2B and an arc-shaped ridge line portion 7 formed by bending the panel 34 are formed. The arc-shaped ridge line portion 7 is formed along the inner edge 30b of the load transmission member 30. The pair of linear ridge line portions 2A and 2B configure a first load transmission ridge line portion formed corresponding to each lower cross member 24, and the arcuate ridge line portion 7 is the first load transmission ridge line in a top view. It constitutes a second load transmission member formed between the portions. The inner ends 2c of the pair of linear ridge portions 2A and 2B are butted to the connecting portions 24e of the front wall 24a and the rear wall 24b of the lower cross member 24 to the side frames 22 via the side frames 22. Moreover, both ends of the arc-shaped ridge line portion 7 overlap with the inner end portions 2c of the linear ridge line portions 2A and 2B in a top view. Inside the side frame 22, a plurality of wall members 23 extending in the vehicle width direction are arranged so as to connect the inner end portions 2c of the linear ridgeline portions 2A and 2B and the connecting portion 27e in a top view.

Also in the vehicle body structure 10 shown in FIG. 6, the collision load can be appropriately transmitted from the load transmitting member 30 to the lower cross member 24 by the linear ridge line portions 2A and 2B and the arc-shaped ridge line portion 7 with respect to a side collision. It is possible to reduce the weight of the load transmission member 30 and suppress an increase in weight of the vehicle body.

In the vehicle body structure 10 of the embodiment shown in FIG. 7, the bending line forming the arcuate ridge line portion 7 is formed so as to have a substantially arc shape by connecting a plurality of straight lines in a top view. Further, the wall member 23 is not arranged inside the side frame 22. Also in this vehicle body structure 10, the collision load can be appropriately transmitted from the load transmission member 30 to the lower cross member 24 by the linear ridge portions 2A and 2B and the arc-shaped ridge portion 7 with respect to a side collision. It is possible to reduce the weight of the member 30 and suppress an increase in the weight of the vehicle body.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

For example, the load transmission member 30 may be fixed to the side sill 14 so as to project outward from the side sill 14 in the vehicle width direction, instead of the side frame 22. In such a case, the collision load input to the load transmitting member 30 is passed through the side sills 14 to a plurality of cross members (for example, the seat cross member 16) that are arranged between the pair of side sills 22 and extend in the vehicle width direction. Can be transmitted.

10 Body Structure 14 Side Sill 16 Seat Cross Member 20 Battery Housing Structure 21 Bottom Panel 22 Side Frame (Side Frame)
24 Upper cross member 26 Lower cross member (Cross member)
30, 37 Load transmitting member 31 Lower panel 32 Upper panel 1A, 1B First linear ridge portion (first load transmitting ridge portion)
1c Inner end 1d Outer end 2A, 2B Linear ridge (first load transmission ridge)
2c Inner end portion 3A, 3B Second linear ridge portion 5, 7 Arc-shaped ridge portion (second load transmitting ridge portion)
5a Top BT battery module

Claims (4)

A pair of frame members arranged at intervals in the vehicle width direction and extending in the vehicle body front-rear direction,
Both ends are connected to the pair of frame members, a plurality of cross members extending in the vehicle width direction,
In a vehicle body structure including a load transmission member fixed to the frame member,
The load transmission member is installed so as to extend outward in the vehicle width direction from the frame member, extend in the vehicle front-rear direction, and extend to a connecting portion of the plurality of cross members lined up at intervals in the vehicle front-rear direction to the frame member. And is formed on the surface between a first load transmission ridgeline portion formed corresponding to each of the plurality of cross members and a first load transmission ridgeline portion adjacent in the vehicle body front-rear direction. And a second load transmitting ridge line portion,
The first load transmission ridges are formed in a pair of linear shapes that are separated from each other from the inner side in the vehicle width direction toward the outer side in a top view, and the inner end portion on the inner side in the vehicle width direction corresponds to the corresponding cross member. Butt with or without the frame member to the connecting portion with the frame member,
The second load transmitting ridgeline portion has a substantially arcuate shape that is convex outward in the vehicle width direction in a top view, and both ends thereof are the same as the inner end portions of the first load transmitting ridgeline portion. Car body structure characterized by overlapping. An outermost apex portion of the second load transmission ridgeline portion in the vehicle width direction is positioned on an inner side in the vehicle width direction than an outer end portion of the first load transmission ridgeline portion on the outer side in the vehicle width direction. The vehicle body structure according to Item 1. A plurality of wall members arranged in a closed cross section of the frame member,
The inner end portions of the first load transmission ridge line portions are abutted with each other through a connecting portion between the corresponding cross member and the frame member and the frame member in a top view,
The plurality of wall members each extend in the vehicle width direction so as to connect the connecting portion and the inner end portion of the first load transmitting ridgeline portion in a top view. Or the vehicle body structure according to 2. The vehicle body structure according to claim 1, wherein the load transmitting member has a closed cross section.

Images