Vehicle rear structure

Abstract

To provide a vehicle rear part structure enabling suppression of influence to a battery or a fuel tank at the time of a vehicle rear collision.SOLUTION: In a rear side member 14, a first bead 24 set so as to be more fragile than the other portions in the rear side member 14 is provided. The first bead 24 is set so as to guide the rear side member 14 to be deformed toward the inside and the lower side in a vehicle width direction when a buffer load is input from a rear cross member 16 at the time of rear collision of a vehicle 11. The rear side member 14 is deformed toward the inside in the vehicle width direction and also deformed toward the lower side with the first bead 24 as an original point when the buffer load is input from the rear cross member 16 at the time of rear collision of the vehicle 11. As a result of this, movement of the rear cross member 16 to the front side of the vehicle is suppressed, thereby making it possible to suppress the influence to a battery 18, for example, the collision load input into the rear cross member 16 being transferred to the battery 18.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rear structure of a vehicle.

Background Art

[0002] The following Patent Document 1 discloses a technology related to a rear structure of a vehicle in which a battery is mounted under the vehicle floor. In this prior art, a cross member (rear cross member) is provided to connect the rear extensions (rear ends) of a pair of rear side frames provided on the left and right of the vehicle body (vehicle). Thus, in this prior art, even when a collision load is inputted in a biased manner to one side of the rear side frame (rear side member) during a rear collision of the vehicle, the collision energy can be efficiently absorbed.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above prior art, when the rear cross member has a curved shape protruding toward the rear side of the vehicle during a rear collision of the vehicle (hereinafter referred to as "rear collision of the vehicle"), if the rear cross member is pushed toward the front side of the vehicle by a barrier, a lateral input to the rear side member in the lateral direction of the vehicle toward the outside in the vehicle width direction acts. In this case, the movement of the rear cross member toward the front side of the vehicle is further promoted, and there is a possibility of adversely affecting the battery or the fuel tank, such as the collision load inputted to the rear cross member being transmitted to the battery or the fuel tank.

[0005] In consideration of the above facts, an object of the present invention is to obtain a rear structure of a vehicle capable of suppressing the influence on the battery or the fuel tank during a rear collision of the vehicle. [Means for solving the problem]

[0006] The vehicle rear structure according to claim 1 comprises left and right rear side members provided on both sides of the rear floor pan in the vehicle width direction and each extending in the vehicle longitudinal direction, a rear cross member extending in the vehicle width direction and joined at both ends in the vehicle width direction to the rear ends of the left and right rear side members in the vehicle longitudinal direction, a battery or fuel tank provided between the left and right rear side members and positioned on the lower side of the rear floor pan in the vehicle vertical direction, and a part provided on the side of the rear side member where it connects to the rear cross member, which is weaker than other parts of the rear side member. The rear side member comprises a first bead provided on the inner side in the vehicle width direction and at the upper end in the vehicle vertical direction, formed in a recess toward the outer side in the vehicle width direction, and a second bead provided on the rear side of the rear side member, further rear than the battery or fuel tank and further forward than the first bead, and is weaker than other parts of the rear side member, provided on the lower side of the rear side member in the vehicle vertical direction, formed in a recess toward the upward side in the vehicle vertical direction, wherein the depth of the first bead is set to be deeper than that of the second bead, and the rear side member is composed of multiple members in the vehicle longitudinal direction, and the members are welded together between the second bead in the vehicle longitudinal direction and the battery or fuel tank, and the laser welding line used to weld the members together is formed to slope toward the upward side in the vehicle vertical direction as it moves toward the rear side in the vehicle longitudinal direction. .

[0007] In the vehicle rear structure according to the invention described in claim 1, the left and right rear side members, rear cross member, battery or fuel tank, First bead (first weak point) and second bead (second weak point) It is equipped with.

[0008] The left and right rear side members are located on both sides of the rear floor pan in the vehicle width direction and extend in the vehicle longitudinal direction. The rear cross member extends in the vehicle width direction, and both ends of the rear cross member in the longitudinal direction (vehicle width direction) are connected to the rear ends of the left and right rear side members in the vehicle longitudinal direction. The battery or fuel tank is located between the left and right rear side members and is positioned on the lower side of the rear floor pan in the vehicle vertical direction.

[0009] Here, the first vulnerable point is located on the side of the rear side member where it connects with the rear cross member, and is more vulnerable than other parts of the rear side member. Furthermore, this first vulnerable point is designed to induce deformation of the rear side member inward in the vehicle width direction and downward in the vehicle vertical direction during a rear-end collision.

[0010] Thus, in this invention, by providing the first weak point, when a collision load is applied from the rear cross member during a rear-end collision, the rear side member deforms inward in the vehicle width direction and downward in the vehicle vertical direction, starting from the first weak point.

[0011] As a comparative example, in a rear-end collision, if the rear cross member is pushed forward, and a lateral force acting outward in the vehicle width direction is applied to the rear side member, the forward movement of the rear cross member may be further accelerated. In this case, the collision load applied to the rear cross member may be transmitted to the battery or fuel tank, potentially causing adverse effects on the battery or fuel tank.

[0012] In contrast, in the present invention, when a collision load is applied to the rear cross member during a rear-end collision, the rear side member deforms inward in the vehicle width direction and downward in the vehicle vertical direction, thereby suppressing the forward movement of the rear cross member. Therefore, in the present invention, it is possible to suppress the impact on the battery or fuel tank, such as the collision load applied to the rear cross member being transmitted to the battery or fuel tank.

[0013] Examples of the first weak point include a bead or a notch. In addition, the first weak point may be formed by the formation of a bend or the like, as long as it serves as a starting point for inducing deformation. The same applies to the second weak point, which will be described later.

[0015] Furthermore, the present invention Furthermore, it is equipped with a second weak point. The second weak point is located on the rear side member, further rearward than the battery or fuel tank and further forward than the first weak point. It is more vulnerable than other parts of the rear side member and is designed to induce downward deformation in the vertical direction of the vehicle during a rear-end collision.

[0016] Thus, in the present invention, by further providing a second weak point, when a collision load is applied from the rear cross member during a rear-end collision, the rear side member deforms inward in the vehicle width direction and downward in the vehicle vertical direction, starting from the first weak point, and the rear side member also deforms downward in the vehicle vertical direction, starting from the second weak point.

[0017] In this invention, when a collision load is applied from the rear cross member during a rear-end collision, the second weak point causes the rear side member to deform further downward in the vertical direction of the vehicle, thereby further suppressing the forward movement of the rear cross member. Therefore, in this invention, it is possible to further suppress the impact on the battery or fuel tank.

[0019] Furthermore, the present invention The first vulnerable point is a first bead located on the rear side member, on the inner side in the vehicle width direction and at the upper end in the vehicle vertical direction, and formed in a recessed shape toward the outer side in the vehicle width direction. As a result, when a collision load is applied from the rear cross member during a rear-end collision, it becomes possible to deform the rear side member toward the inward side in the vehicle width direction and toward the downward side in the vehicle vertical direction, starting from the first bead.

[0020] Furthermore, the second weak point is located on the lower side of the rear side member in the vertical direction of the vehicle, and is a second bead formed by being recessed toward the upward side in the vertical direction of the vehicle. As a result, when a collision load is applied from the rear cross member during a rear-end collision, it becomes possible to deform the rear side member toward the downward side in the vertical direction of the vehicle, starting from the second bead.

[0021] Here, in the present invention, the depth of the first bead is set to be deeper than that of the second bead. As a result, in the present invention, when a collision load is input from the rear cross member during a rear-end collision of the vehicle, after deforming the rear side member starting from the first bead, it becomes possible to deform the rear side member starting from the second bead, and it becomes possible to stabilize the deformation shape of the rear side member.

[0023] Furthermore, the present invention Then, the rear side member is composed of a plurality of members in the vehicle front-rear direction, and the members are welded to each other between the second bead in the rear side member and the battery or the fuel tank.

[0024] In this way, by configuring the rear side member with a plurality of members in the vehicle front-rear direction and welding the members to each other, it is possible to improve the rigidity of the rear side member with respect to the vehicle front-rear direction. Further, by welding the members to each other (welding portion), the rigidity difference between the welding portion and the second bead becomes larger, and it becomes possible to make the deformation position starting from the second bead more stable.

[0025] Furthermore, in the laser welding line where the members are welded to each other, the rigidity is higher than the portions before and after the laser welding line, and accordingly, the reaction force against an impact also increases. Therefore, by forming the laser welding line to incline upward in the vehicle vertical direction as it goes toward the rear side in the vehicle front-rear direction, after the rear side member deforms downward in the vehicle vertical direction starting from the second bead, the front end portion of the deformed portion of the rear side member is stabilized by the laser welding line having substantially the same shape, and it becomes possible to suppress the movement of the deformed portion toward the front side.

[0026] Claim 2The vehicle rear structure according to the invention described in [reference] is, in the vehicle rear structure according to the invention described in claim 1, wherein the rear side member is composed of a plurality of members in the vehicle front-rear direction, and the position in the vehicle front-rear direction of the welding portion where the members are welded to each other is set to be different between the inner side and the outer side in the vehicle width direction of the rear side member.

[0027] Claim 2 In the vehicle rear structure according to the invention described in [reference], the rear side member is composed of a plurality of members in the vehicle front-rear direction of the rear side member. And the position in the vehicle front-rear direction of the welding portion where the members are welded to each other is set to be different between the inner side and the outer side in the vehicle width direction of the rear side member.

[0028] Thus, in the present invention, by changing the rigid and weak parts between the inner side and the outer side in the vehicle width direction in the vehicle front-rear direction of the rear side member, it is possible to adjust the deformation mode in the rear side member.

Effect of the Invention

[0029] The vehicle rear structure according to the present invention can suppress the influence on the battery or the fuel tank during a rear-end collision of the vehicle.

Brief Description of the Drawings

[0030] [Figure 1] It is a left side view seen from the left side showing the vehicle rear to which the vehicle rear structure according to the present embodiment is applied. [Figure 2] It is a top view seen from the upper side showing the left side of the vehicle rear to which the vehicle rear structure according to the present embodiment is applied. [Figure 3] It is a left side view corresponding to FIG. 1 showing the state during a rear-end collision of the vehicle. [Figure 4] It is a top view corresponding to FIG. 2 showing the state during a rear-end collision of the vehicle. [Figure 5] It is a left side view showing a further deformed state with respect to FIG. 3. [Figure 6] It is a top view showing a further deformed state with respect to FIG. 4. [Modes for carrying out the invention]

[0031] A vehicle rear structure 10 according to an embodiment of the present invention will be described below with reference to the drawings. The arrows FR, UP, and RH indicated in each figure as appropriate represent the forward direction (direction of vehicle travel), upward direction, and right direction (one side of the vehicle width direction), respectively. When the directions front / back, left / right, and up / down are used in the following description, unless otherwise specified, they refer to the front / back in the vehicle's front-rear direction, the left / right in the vehicle's left-right direction (vehicle width direction), and the up / down in the vehicle's up-down direction.

[0032] <Configuration of the rear structure of the vehicle> First, the configuration of the vehicle rear structure 10 according to the embodiment of the present invention will be described.

[0033] Figure 1 is a side view of the left side of the rear of a vehicle (rear of the vehicle body) 12 to which the vehicle rear structure 10 according to an embodiment of the present invention is applied, and Figure 2 is a top view of the left side of the vehicle rear 12. As shown in Figures 1 and 2, the vehicle rear structure 10 comprises left and right rear side members 14, a rear cross member 16, and a battery (or fuel tank) 18. Although only the left side of the vehicle rear 12 is shown in Figure 2, the right side is substantially the same as the left side.

[0034] The rear side members 14 are provided on the left and right sides of the rear floor pan (not shown) and extend in the front-rear direction. The rear cross member 16 extends in the vehicle width direction, and both ends 16A of the rear cross member 16 are connected to the rear ends 14A of the left and right rear side members 14 via connecting parts 20 by welding or the like. The rear cross member 16 also has a gently curved shape that protrudes toward the rear of the vehicle.

[0035] The battery 18 is mounted on the left and right rear side members 14, located between the left and right rear side members 14, and positioned below the rear floor pan. A cross member 22 spans between the left and right rear side members 14, behind the battery 18.

[0036] Note that the battery 18 does not necessarily have to be mounted on the rear side member 14, and may be mounted on other components, although this is not shown in the diagram.

[0037] (Rear side member) Now, let's explain the rear side member 14.

[0038] In this embodiment, the rear side member 14 has a rectangular tubular shape, for example, in a cross-sectional shape that forms a closed section when cut along the vehicle width direction.

[0039] Furthermore, the rear side member 14 is provided with a first bead (first weak point) 24 and a second bead (second weak point) 26, respectively, which are designed to be weaker than other parts of the rear side member 14.

[0040] The first bead 24 is configured to induce deformation in the inward and downward direction in the vehicle width direction relative to the rear side member 14 when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11. For example, the first bead 24 is provided on the side of the rear side member 14 where it connects with the rear cross member 16, and is located on the inward and upper end of the rear side member 14 in the vehicle width direction, and is formed as a recess toward the outward direction in the vehicle width direction. Furthermore, the depth of the first bead 24 is configured to be deeper than that of the second bead 26, which will be described later.

[0041] On the other hand, the second bead 26 is configured to induce a downward deformation of the rear side member 14 when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11. For example, the second bead 26 is located on the rear side member 14, behind the battery 18 and in front of the first bead 24, on the lower side of the rear side member 14, and is formed in a recessed shape toward the upward side.

[0042] In this embodiment, the rear side member 14 is composed of, for example, a plurality of members 28, 30, and 32 in the longitudinal direction of the vehicle, and adjacent members 28, 30, and 32 are welded (joined) together by laser welding. Here, the welded portion 34 where member 30 and member 32 are welded is set to be located between the second bead 26 and the battery 18. In addition, the laser welding line 36 formed in the welded portion 34 is formed to be inclined upward as it approaches the rear.

[0043] Furthermore, the positions of the welds 31, 33, and 34 on the rear side member 14 in the vehicle's longitudinal direction are set to be different on the inner and outer sides in the vehicle's width direction. The laser welding line 36 is located on the outer side of the rear side member 14 in the vehicle's width direction.

[0044] <Function and effect of the rear structure of the vehicle> Next, the operation and effects of the vehicle rear structure 10 according to the embodiment of the present invention will be described.

[0045] In this embodiment, as shown in Figures 1 and 2, the rear side member 14 is provided with a first bead 24 and a second bead 26, respectively, which are set to be weaker than other parts of the rear side member 14.

[0046] The first bead 24 is configured to induce deformation of the rear side member 14 inward and downward in the vehicle width direction when a collision load is input from the rear cross member 16 during a rear-end collision of the vehicle 11. In other words, in this embodiment, with the provision of the first bead 24, when a collision load is input from the rear cross member 16 during a rear-end collision of the vehicle 11, as shown in Figures 3 and 4, the rear side member 14 deforms inward in the vehicle width direction and downward, starting from the first bead 24.

[0047] As a comparative example, although not shown in the diagram, if the rear cross member 16 is pushed forward by a rearward collision of vehicle 11, the rear cross member 16 has a curved shape that protrudes toward the rear of the vehicle. Therefore, the deformation (e.g., extension) of the rear cross member 16 may cause the left and right rear side members 14 to be pushed outward in the vehicle width direction. In this case, the forward movement of the rear cross member 16 is accelerated, and the collision load applied to the rear cross member 16 may be transmitted to the battery 18, potentially having an adverse effect on the battery 18.

[0048] In contrast, in this embodiment, as described above, when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11, the rear side member 14 deforms inward in the vehicle width direction and also deforms downward. When the rear side member 14 deforms inward in the vehicle width direction, the length in the vehicle width direction at the rear end 14A of the left and right rear side members 14 becomes shorter, and as a result, the rear cross member 16 deforms such that, for example, the central part 16B in the longitudinal direction bulges upward.

[0049] Thus, in this embodiment, the rear side members 14 deform inward in the vehicle width direction and downward, thereby suppressing outward input in the vehicle width direction to the left and right rear side members 14, and suppressing the forward movement of the rear cross member 16. As a result, in this embodiment, it is possible to suppress the impact on the battery 18, such as the transmission of the collision load input to the rear cross member 16 to the battery 18.

[0050] In other words, in this embodiment, the rear of the vehicle 12 is divided into a deformable region 38 that includes the rear side member 14 and is deformable, and a non-deformable region 40 that suppresses deformation, with the battery 18 and the like provided in the non-deformable region 40. For example, the area in front of the cross member 22 is designated as the non-deformable region 40, and the area behind the cross member 22 is designated as the deformable region 38. In the deformable region 38, collision energy is absorbed by deforming the rear side member 14, and in the non-deformable region 40, the battery 18 and the like are protected by suppressing the deformation of the rear side member 14.

[0051] On the other hand, the second bead 26 is configured to induce downward deformation of the rear side member 14 when a collision load is input from the rear cross member 16 during a rear-end collision of the vehicle 11. Thus, in this embodiment, by further providing the second bead 26, when a collision load is input from the rear cross member 16 during a rear-end collision of the vehicle 11, the rear side member 14 deforms downward, as shown in Figures 5 and 6. As a result, the forward movement of the rear cross member 16 is further suppressed, and the impact on the battery 18, such as the transmission of the collision load input to the rear cross member 16 to the battery 18, is further suppressed.

[0052] (First bead, second bead) Here, we will explain the first bead 24 and the second bead 26 in more detail.

[0053] In this embodiment, as shown in Figures 1 and 2, for example, the first bead 24 is provided on the side of the rear side member 14 where it connects with the rear cross member 16, and is located on the inner side and upper end of the rear side member 14 in the vehicle width direction, and is formed to be recessed toward the outer side in the vehicle width direction.

[0054] As a result, when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11, it becomes possible to deform the rear side member 14 inward in the vehicle width direction and downward, starting from the first bead 24, as shown in Figures 3 and 4.

[0055] On the other hand, the second bead 26 is located on the rear side member 14, behind the battery 18 and in front of the first bead 24. It is located on the lower side of the rear side member 14 and is formed in a recessed shape toward the upward. As a result, when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11, it becomes possible to deform the rear side member 14 toward the downward, starting from the second bead 26, as shown in Figures 5 and 6.

[0056] Furthermore, the depth of the first bead 24 is set to be deeper than that of the second bead 26. This allows that when a collision load is applied from the rear cross member 16 during a rear-end collision of the vehicle 11, the rear side member 14 is deformed starting from the first bead 24, as shown in Figures 3 and 4, and then the rear side member 14 is deformed starting from the second bead 26, as shown in Figures 5 and 6.

[0057] In other words, when a collision load is applied to the rear cross member 16 during a rear-end collision of the vehicle 11, the rear side member 14 is deformed inward in the vehicle width direction and downward, starting from the first bead 24, and then deformed downward, starting from the second bead 26. This makes it possible to stabilize the deformed shape of the rear side member 14.

[0058] Furthermore, in this embodiment, as shown in Figures 1 and 2, the rear side member 14 is composed of, for example, a plurality of members 28, 30, and 32 along the longitudinal direction of the vehicle, and the members 30 and 32 are welded to each other between the second bead 26 of the rear side member 14 in the longitudinal direction of the vehicle and the battery 18.

[0059] In this way, by constructing the rear side member 14 from multiple members 28, 30, and 32 and welding the members 28, 30, and 32 to each other (welded sections 31, 33, and 34), the rigidity of the rear side member 14 in the longitudinal direction of the vehicle can be improved. Furthermore, by welding the members 28, 30, and 32 to each other, the difference in rigidity between the welded section 34 and the second bead 26 becomes larger, making it possible to stabilize the deformation position originating from the second bead 26.

[0060] Furthermore, the laser welding line 36 that welds the members 30 and 32 together has higher rigidity than the parts before and after the laser welding line 36, and consequently the reaction force against impact also increases. For this reason, by forming the laser welding line 36 to incline upward in the vertical direction of the vehicle as it moves towards the rear in the longitudinal direction of the vehicle, after the rear side member 14 deforms downward starting from the second bead 26, the front end 42A of the deformed portion 42 of the rear side member 14 is stabilized by the laser welding line 36 which has substantially the same shape, and the forward movement of the deformed portion 42 is suppressed.

[0061] Furthermore, in this embodiment, the rear side member 14 is composed of a plurality of members 28, 30, and 32 along the vehicle's longitudinal direction. The positions of the welds 31, 33, and 34, where the members 28, 30, and 32 are welded together, are set to be different on the inner and outer sides of the rear side member 14 in the vehicle's width direction.

[0062] Thus, in this embodiment, the deformation mode of the rear side member 14 can be adjusted by changing the rigidity of the rear side member 14 between the inner and outer sides in the vehicle width direction in the vehicle longitudinal direction.

[0063] <Note> Furthermore, the following configurations may be combined as appropriate to form the vehicle understructure according to the present invention.

[0064] (Composition 1) The rear structure of the vehicle comprises left and right rear side members provided on both sides of the rear floor pan in the vehicle width direction and each extending in the vehicle longitudinal direction; a rear cross member extending in the vehicle width direction and joined at both ends in the vehicle width direction to the rear ends of the left and right rear side members in the vehicle longitudinal direction; a battery or fuel tank provided between the left and right rear side members and positioned on the lower side of the rear floor pan in the vehicle vertical direction; and a first vulnerable portion provided on the side of the rear side member where it is joined to the rear cross member, which is weaker than other parts of the rear side member and is set to induce deformation of the rear side member in the vehicle width direction and downward in the vehicle vertical direction during a collision from the rear of the vehicle.

[0065] (Configuration 2) The rear side member further includes a second weak point, which is located on the rearward side of the vehicle beyond the battery or fuel tank and on the forward side of the vehicle beyond the first weak point, and is weaker than other parts of the rear side member, and is configured to induce downward deformation in the vertical direction of the vehicle when a collision occurs from the rear of the vehicle.

[0066] (Composition 3) The first weak portion is a first bead provided on the rear side member on the inner side in the vehicle width direction and at the upper end in the vehicle vertical direction, and is formed as a recess toward the outer side in the vehicle width direction. The second weak portion is a second bead provided on the lower side in the vehicle vertical direction of the rear side member, and is formed as a recess toward the upper side in the vehicle vertical direction. The depth of the first bead is set to be deeper than that of the second bead.

[0067] (Composition 4) The rear side member is composed of multiple members in the longitudinal direction of the vehicle, and the members are welded together between the second bead in the longitudinal direction of the rear side member and the battery or the fuel tank, and the laser welding line used to weld the members together is formed to be inclined upward in the vertical direction of the vehicle as it moves towards the rear in the longitudinal direction of the vehicle.

[0068] (Composition 5) The rear side member is composed of multiple members in the longitudinal direction of the vehicle, and the position of the welded joints where the members are welded together is set to be different on the inside and outside in the vehicle width direction of the rear side member.

[0069] Furthermore, the present invention can be implemented with various modifications without departing from its essence. Of course, the scope of the present invention is not limited to the embodiments described above. [Explanation of Symbols]

[0070] 10. Rear structure of the vehicle 11 vehicles 12 Rear of the vehicle 14 Rear side member 14A Rear end (rear end of the rear side member in the vehicle's longitudinal direction) 16 Rear cross member 16A End (End in the vehicle width direction of the rear cross member) 18 batteries 20 Joint 24. First Bead (First Vulnerable Area) 26. Second Bead (Second Vulnerable Area) 28 components 30 components 31 Welded section 32 components 33 Welded section 34 Welded section 36 Laser Welding Lines

Claims

1. The rear floor pan is provided on both sides in the vehicle width direction, and the left and right rear side members extend in the vehicle front-rear direction, A rear cross member is provided, which extends in the vehicle width direction and has both ends in the vehicle width direction connected to the rear ends in the vehicle front-rear direction of the left and right rear side members, A battery or fuel tank is provided between the left and right rear side members and positioned on the lower side of the rear floor pan in the vehicle's vertical direction, A first bead is provided on the side of the rear side member where it connects with the rear cross member, is weaker than other parts of the rear side member, is provided on the inner side in the vehicle width direction and at the upper end in the vehicle vertical direction, and is formed to be recessed toward the outer side in the vehicle width direction, A second bead is provided on the rear side member, further rearward than the battery or fuel tank and further forward than the first bead, and is weaker than other parts of the rear side member, and is provided on the lower side of the rear side member in the vertical direction of the vehicle, and is formed to be recessed upward in the vertical direction of the vehicle. Equipped with, The depth of the first bead is set to be deeper than that of the second bead, and the rear side member is composed of multiple members in the longitudinal direction of the vehicle, and the members are welded together between the second bead in the longitudinal direction of the vehicle and the battery or the fuel tank, and the laser welding line used to weld the members together is formed to be inclined upward in the vertical direction of the vehicle as it moves towards the rear in the longitudinal direction of the vehicle.

2. The rear vehicle structure according to Claim 1, wherein the positions of the welded portions where the plurality of members are welded together are set to be different on the inside and outside in the vehicle width direction of the rear side member.

Images