JP2019026237A - Vehicle rear structure - Google Patents

Abstract

To provide a vehicle rear structure that can strike a balance between usability of a luggage room and battery protective performance at rear collision, in a vehicle of which vehicle rear part is mounted with a hydrogen tank and a battery.SOLUTION: In a vehicle rear structure, a third hydrogen tank 28 is disposed between a pair of right and left rear side members 20 extending in a vehicle longitudinal direction while constituting part of a vehicle body in a vehicle rear part 12 of a vehicle 10, and an auxiliary battery 78 is disposed on an outer side in a vehicle width direction of the rear side member 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle rear structure, and more particularly to a vehicle rear structure in which a hydrogen tank and a battery are arranged at the vehicle rear.

  In a fuel cell vehicle, a hydrogen tank that stores hydrogen may be mounted at the rear of the vehicle.

  In the vehicle rear portion structure described in Patent Document 1, two hydrogen tanks adjacent to the front and rear are attached below the rear side member via a tank frame at the vehicle rear portion. Further, a kick-up portion as an easily deformable portion for bending the rear side member up and down by a collision load from the rear is set at an intermediate position between the two hydrogen tanks on the rear side member. Therefore, the rear side member can be bent and deformed at the kick-up portion by the collision load input at the time of the rear collision, and the shock absorption can be improved.

  Further, in the vehicle rear structure described in Patent Document 1, the tank frame is attached to the rear side member, whereby the rear side member is partially reinforced, and the cargo compartment rear floor above the portion where the rear side member is reinforced. A battery is mounted on the panel. By setting it as such a structure, in the vehicle rear part structure described in patent document 1, it is suppressing that a battery is damaged at the time of a vehicle rear-end collision.

JP 2009-190523 A

  However, in the vehicle rear structure described in Patent Document 1, the main space in the center in the vehicle width direction of the cargo compartment is pressed by the battery, and the convenience of the cargo compartment is poor. On the other hand, when the battery is disposed below the deck board behind the hydrogen tank, the battery may be caught between the hydrogen tank and the collision object at the time of a rear collision, which is not desirable from the viewpoint of protecting the battery. Further, from the viewpoint of protecting the battery by suppressing contact with other components, it is desirable that the battery is kept fixed at a predetermined position of the vehicle body even if the rear side member is deformed at the time of a rear collision.

  In view of the above facts, the present invention provides a vehicle rear structure that can achieve both the convenience of a luggage compartment and the battery protection performance at the time of rear collision in a vehicle in which a hydrogen tank and a battery are mounted at the rear of the vehicle. Is the purpose.

  The vehicle rear portion structure according to the first aspect of the present invention comprises a pair of left and right rear sides that constitute a part of the vehicle body at the vehicle rear portion and extend in the vehicle front-rear direction and are spaced apart in the vehicle width direction. A member, a hydrogen tank disposed between the pair of left and right rear side members, fixed to the vehicle body, and disposed on the vehicle width direction outer side of the rear portion of the vehicle, with an inner end in the vehicle width direction fixed to the rear side member A floor panel extending outward in the vehicle width direction from the rear side member, a battery disposed on the floor panel on the outer side in the vehicle width direction of the rear side member, and an inner end in the vehicle width direction are fixed to the rear side member. And extends to the upper part of the battery toward the outside in the vehicle width direction, and holds the battery sandwiched between the floor panel and the floor panel. And, the has.

  In the vehicle front structure according to the first aspect of the present invention, the battery is disposed on the floor panel on the outer side in the vehicle width direction of the rear side member. It is convenient to use the luggage compartment without using it. The battery is disposed on the outer side in the vehicle width direction of the rear side member, while the hydrogen tank is disposed between the pair of rear side members, and the battery and the high-strength hydrogen tank are offset in the vehicle width direction. For this reason, even when a collision load from the rear is applied to the rear side member at the time of a rear collision of the vehicle and the rear side member is deformed, it is possible to suppress the battery from being caught between the hydrogen tank and the collision object.

  In addition, since the battery is prevented from being caught between the hydrogen tank and the collision object, a large external force is hardly generated in the battery, and the battery clamp is not easily deformed. For this reason, a battery is hold | maintained between a battery clamp and a floor panel, and the fixed state of the battery with respect to a vehicle body is maintained.

  According to a second aspect of the present invention, there is provided a vehicle rear portion structure according to the first aspect of the invention, wherein the rear side member includes a curved portion that curves in an upward convex shape in an arch shape in a side view of the vehicle. Also extends in the vehicle front-rear direction to the rear in the vehicle front-rear direction, and the battery is disposed on the floor panel on the vehicle width direction outer side of the rear side member on the rear side in the vehicle front-rear direction with respect to the curved portion. A floor that is fixed to the floor panel at a lower portion thereof, has an inner end in the vehicle width direction fixed to the rear side member, and extends outward in the vehicle width direction to a position where the battery is disposed on the floor panel. Has a reinforcement.

  In the vehicle front portion structure according to the second aspect of the present invention, when a rear collision is applied to the rear side member at the time of rear collision of the vehicle, the rear side member is curved in an upward convex shape in an arch shape at the curved portion. Therefore, the rear portion of the rear side member is easily deformed so as to be lifted from the rear end of the curved portion, and the energy at the time of the rear impact is stably absorbed. In this case, the floor panel under the battery is reinforced by the floor reinforcement, so that the battery can be lifted together with the floor panel to follow the deformation of the rear side member. Therefore, the fixed state of the vehicle body and the battery can be maintained.

  A vehicle rear portion structure according to a third aspect of the present invention is the vehicle rear structure according to the second aspect, wherein the vehicle rear structure is fixed to the floor reinforcement at a lower portion of the floor reinforcement and is closed between the floor reinforcement and the floor reinforcement. It has a bracket that forms a cross section.

  In the vehicle rear structure according to the third aspect of the present invention, the floor panel below the battery is further reinforced by the bracket, so that when the rear side member is deformed at the time of a rear collision, the battery is further deformed. Can be followed. Therefore, the fixed state of the vehicle body and the battery can be further maintained.

  A vehicle rear structure according to a fourth aspect of the present invention is the vehicle rear structure according to any one of the first to third aspects, wherein the vehicle rear structure is fixed to the floor panel between the battery and the floor panel. A battery carrier on which the battery is mounted; and extends in the vehicle vertical direction outside the battery in the vehicle width direction; the upper end is connected to the outer end of the battery clamp in the vehicle width direction; and the lower end is the vehicle width of the battery carrier. And an outer connecting portion connected to the outer end portion in the direction.

  In the vehicle rear structure according to the fourth aspect of the present invention, the battery is easily held between the battery clamp and the floor panel, and the vehicle body and the battery can be maintained in a fixed state.

  According to a fifth aspect of the present invention, in the vehicle rear portion structure according to the present invention, the battery and the rear side member are wrapped in a side view of the vehicle according to any one of the first to fourth aspects.

  In the vehicle rear structure according to the fifth aspect of the present invention, since the battery is wrapped with the rear side member in a side view, the battery and the hydrogen tank are separated by the rear side member. However, it is possible to further suppress the battery from being caught between the hydrogen tank and the collision object. Further, as compared with the case where the battery is provided on the rear side member, the space in the vertical direction of the vehicle can be effectively used, and the rear portion of the vehicle can be prevented from being enlarged.

  A vehicle rear portion structure according to a sixth aspect of the present invention is the vehicle rear structure according to any one of the first to fifth aspects, wherein the pair of rear side members extend in the vehicle front-rear direction on the inner side in the vehicle width direction. And a pair of left and right second members.

  In the vehicle rear structure according to the sixth aspect of the present invention, since the battery and the hydrogen tank are also separated by the second member, even if the rear side member is deformed at the time of a rear collision, the battery is interposed between the hydrogen tank and the collision object. It is possible to further suppress pinching.

  The vehicle front structure according to the present invention described in claim 7 is the vehicle front structure according to any one of claims 2 to 6, wherein the rear side member includes a front member on which the curved portion is formed; And a rear member connected to the front member at the rear end of the curved portion and extending rearward in the vehicle front-rear direction.

  In the vehicle front structure according to the seventh aspect of the present invention, the connection portion between the front member and the rear member is provided at the rear end portion of the curved portion of the rear side member. The rear portion of the rear side member is easily deformed so as to be lifted from the starting point, and the rear impact energy is absorbed more stably. Therefore, a large external force is hardly generated in the battery, and the battery clamp is not easily deformed. For this reason, a battery is hold | maintained between a battery clamp and a floor panel, and the fixed state of the battery with respect to a vehicle body is maintained.

  As described above, the vehicle rear structure according to the present invention has an excellent effect that it is possible to provide a vehicle rear structure that can achieve both the convenience of the luggage compartment and the battery protection performance at the time of rear collision. Have.

It is a top view which shows the vehicle rear part structure which concerns on embodiment of this invention. It is a side view which shows the vehicle rear part structure which concerns on embodiment of this invention. It is a side view which expands and shows the vehicle rear part structure which concerns on embodiment of this invention. It is a perspective view which shows the suspension member, floor cross member, and 2nd member which concern on embodiment of this invention. It is a perspective view which shows the structure of the battery periphery which concerns on embodiment of this invention. In FIG. 3, it is a perspective view which shows the state which removed the battery. FIG. 7 is an enlarged cross-sectional view of the vehicle rear view, showing an enlarged cut surface taken along line 7-7 in FIG. 1. It is the perspective view seen from the vehicle lower part which shows the vehicle rear part structure which concerns on embodiment of this invention. It is a side view showing roughly the deformation at the time of rear collision of the vehicle rear part structure concerning the embodiment of the present invention.

  Hereinafter, an embodiment of a vehicle front structure according to the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in each drawing indicates a vehicle front side, an arrow UP indicates a vehicle upper side, and an arrow OUT indicates an outer side in the vehicle width direction. Further, in the following description, when using the front / rear, up / down, and left / right directions, the front / rear direction of the vehicle, the up / down direction of the vehicle up / down direction, and the left / right direction in the traveling direction are indicated.

(Overall configuration of vehicle rear structure)
FIG. 1 is a plan view showing a vehicle rear portion 12 of a vehicle 10 including a vehicle rear portion structure according to the present embodiment. This vehicle 10 is a rear-wheel drive fuel cell vehicle, and is arranged in a transaxle 16 by optimally using two energy sources, an FC (Fuel Cell) stack and an HV (High Voltage) battery 14 (not shown). A motor (not shown) is driven to drive a pair of left and right rear wheels 18.

  Further, on both outer sides in the vehicle width direction of the vehicle rear portion 12 (on both outer sides of the transaxle 16), a part of the vehicle body of the vehicle 10 is formed, each extending in the vehicle front-rear direction and spaced apart in the vehicle width direction. A pair of left and right rear side members 20 are arranged. Below the left and right rear side members 20, a rear suspension member 22 formed in a # shape in a top view is disposed, and the above-described transaxle 16 is mounted on the rear suspension member 22 via a vibration isolation mount (not shown). ing. Further, the above-described HV battery 14 is disposed above the transaxle 16. Further, on the inner side and the upper side of the rear side member 20 in the vehicle width direction, a cargo compartment 21 is formed by covering the vehicle body of the vehicle 10 with a deck board or the like (not shown). A main space 21 </ b> S of the luggage compartment 21 is formed in the center of the cargo compartment 21 in the vehicle width direction.

  In this vehicle 10, three hydrogen tanks are mounted in three places in order to extend the travelable distance with one fuel (hydrogen) supply. Specifically, the vehicle 10 includes a first hydrogen tank 24 disposed in the center of the vehicle with the vehicle longitudinal direction as the longitudinal direction, and a second hydrogen tank disposed in front of the transaxle 16 with the vehicle width direction as the longitudinal direction. 26 and a third hydrogen tank 28 disposed behind the transaxle 3 with the vehicle width direction as the longitudinal direction. These first to third hydrogen tanks 24, 26, and 28 are connected to each other by pipes (not shown), and are configured to supply hydrogen filled therein to the FC stack. Each of the hydrogen tanks 24, 26, and 28 includes, for example, an inner wall layer formed of metal, hard resin, or the like, and an outer wall layer formed by wrapping fiber reinforced plastic or the like several times. It is configured with high rigidity so as not to be easily deformed by internal pressure or external force at the time of vehicle collision.

  Hereinafter, each component will be described in detail.

(Rear suspension member and transaxle)
The rear suspension member 22 on which the transaxle 16 is mounted is configured as a skeleton member that supports a pair of left and right rear suspensions (not shown) that supports the rear wheel 18 so as to be swingable. As shown in FIG. 1, the rear suspension member 22 includes a pair of left and right side rails 30 extending in the vehicle longitudinal direction and spaced apart in the vehicle width direction, and a front cross member 32 and a rear cross member 34 respectively extending in the vehicle width direction. And have.

  As shown in FIG. 1, the side rail 30 is curved so that the center portion 30C in the vehicle front-rear direction is located on the inner side in the vehicle width direction than the front portion 30A and the rear portion 30B in the vehicle front-rear direction, and as shown in FIG. In addition, the central portion 30C is curved so as to be positioned on the upper side in the vehicle vertical direction with respect to the front portion 30A and the rear portion 30B in a side view of the vehicle. The rear suspension member 22 connects the front part 30A of the left and right side rails 30 with the front cross member 32 in the vehicle width direction, and the rear part 30B of the left and right side rails 30 with the rear cross member 34 in the vehicle width direction. By connecting, it is formed in # shape. Further, the side rail 30 is formed with a load receiving portion 31 having a load receiving surface 31A facing the rear side in the vehicle longitudinal direction and facing a floor cross member 55 described later. The load receiving portion 31 is formed in a protruding shape standing upward at a position between the central portion 30C and the rear portion 30B of the side rail 30. The position in the vehicle front-rear direction in which the side rail 30 is disposed substantially coincides with the position in the vehicle front-rear direction of a curved portion 46 of the rear side member 20 described later.

  The transaxle 16 is supported by the front cross member 32 via two vibration isolation mounts and is also supported by the rear cross member 34 via one vibration isolation mount, so that the rear suspension member 22 is elastically supported. Three points are supported. Further, as shown in FIG. 2, the transaxle 16 is located in front of the floor cross member 55, which will be described later, in the vehicle front-rear direction. On the other hand, the rear suspension member 22 is elastically applied to the pair of left and right rear side members 20 via insulators (not shown) attached to mounting portions 36 and 38 formed on the front portion 30A and the rear portion 30B of the left and right side rails 30, respectively. The rear suspension member 22 constitutes a part of the vehicle body of the vehicle 10.

(Rear side member)
As shown in FIGS. 5 and 6, each rear side member 20 includes a front portion 40 as a front member disposed on the front side in the vehicle front-rear direction and a rear portion 42 as a rear member disposed on the rear side in the vehicle front-rear direction. And. The front portion 40 has a front end portion 40A connected to a rear end portion of a rocker 44, which is a skeleton member constituting the vehicle body, and a rear portion (more specifically, near the outside in the vehicle width direction of the transaxle 16), A curved portion 46 that is curved in an upwardly convex shape in an arch shape when viewed from the side of the vehicle is formed. The rear side member 20 is bent at the bending portion 46 so that the center portion 46C of the bending portion 46 in the vehicle front-rear direction is located on the inner side in the vehicle width direction than the front end portion 40A and the rear end portion 40B of the front portion 40 (FIG. 1). The central portion 46C of the curved portion 46 is curved so as to be positioned above the front end portion 40A and the rear end portion 40B of the front portion in the vehicle vertical direction (see FIG. 2).

  As shown in FIGS. 5 and 6, the rear portion 42 has a front end portion 42A connected to a rear end portion 46A of the curved portion 46 of the front portion 40 and extends rearward in the vehicle front-rear direction. A flange portion (not shown) provided at the rear end portion 42B of the portion 42 is connected to the rear bumper force 50. Furthermore, the rear portion 42 is connected to the rear end panel 48 via a rear bracket 51 (see FIGS. 5 and 6) provided at the rear end portion 42B. The rear portion 42 extends inward in the vehicle width direction from the locker 44 and extends rearward in the vehicle front-rear direction (see FIG. 1). In the present embodiment, a connecting portion 20 </ b> A between the front portion 40 and the rear portion 42 is provided at the rear end portion 46 </ b> A of the curved portion 46 of the rear side member 20. That is, the cross section changes at the front end portion 42 </ b> A of the rear portion 42.

  The front portion 40 is formed in a closed cross section having a rectangular cross section perpendicular to the extending direction, and the rear portion 42 has a flange portion 42C on the lower side in the vertical direction of the vehicle, and the cross section perpendicular to the extending direction is formed. It is formed in a hat shape that opens downward. The front portion 40 and the rear portion 42 are connected to the front end portion 42A of the rear portion 42 by inserting the rear end portion 40B of the front portion 40 and spot welding in an overlapped manner, thereby forming the connecting portion 20A. (See FIG. 5 or FIG. 6). That is, in the rear side member 20, the connecting portion 20 </ b> A has a plate thickness of two because the front portion 40 and the rear portion 42 overlap each other. Thus, the cross section of the rear side member 20 changes from the rear end portion 46A of the curved portion 46 to the rear.

(Rear side floor panel)
7 and 8, a rear side floor panel 52 as a floor panel is welded to the flange portion 42C of the rear portion 42. The rear side floor panel 52 is welded and fixed to the flange portion of the rear portion 42 so as to cover the rear portion 42 opened downward in a hat shape from the lower side. It extends to a position outside the rear side member 20 behind the rear wheel 18 in the vehicle width direction (see FIG. 1). That is, the rear side floor panel 52 is disposed outside the vehicle rear portion 12 in the vehicle width direction. A battery carrier 88 to be described later is fixed to the upper surface of the rear side floor panel 52, and a floor reinforcement 98 and an oil cooler bracket 102 to be described later are fixed to the lower surface.

(Floor cross member)
As shown in FIGS. 1 to 6, a floor cross member 55 extending in the vehicle width direction is located in front of the third hydrogen tank 28 of the rear floor pan 54 (inward in the vehicle width direction of the rear end portion 46 </ b> A of the curved portion 46). Between the rear side members 20 and the left and right rear side members 20 from the inner side in the vehicle width direction. A second member 68 described later is disposed behind the floor cross member 55 in the vehicle front-rear direction. The floor cross member 55 has a rectangular cross section perpendicular to the extending direction, and has an upper strength lower than a lower strength at a position where the second member 68 is connected as described later. The deformation starting point portion is provided. Further, the front surface 55B of the floor cross member 55 facing the front in the vehicle front-rear direction faces the load receiving surface 31A of the side rail 30. 4 and 5, the second member 68 is omitted.

(3rd hydrogen tank and rear floor pan)
As shown in FIGS. 3 and 7, the third hydrogen tank 28 is covered with a rear floor pan 54 at the top. The rear floor pan 54 has an outer end in the vehicle width direction welded to a flange portion 42C of the rear portion 42 of the left and right rear side members 20 and spanned between the left and right rear portions 42. A space for mounting the third hydrogen tank 28 is ensured by bulging upwardly between the vehicles 20 upwardly. That is, the third hydrogen tank 28 is arranged so as to wrap (overlap) the rear side member 20 in a side view of the vehicle. A rear cross member 34 of the rear suspension member 22 is disposed in front of the third hydrogen tank 28 below the floor cross member 55. Further, a rear portion of the rear floor pan 54 behind the third hydrogen tank 28 is provided with a protruding portion 56 in which the rear floor pan 54 protrudes downward, and a tank reinforcement 58 extending in the vehicle width direction is provided below the protruding portion 56. It is attached.

  As shown in FIG. 3, the tank reinforcement 58 includes a hat-like upper reinforcement 58 </ b> A whose section perpendicular to the extending direction is opened downward, and a section perpendicular to the extending direction facing upward. An open hat-shaped lower reinforcement 58B, and the upper reinforcement 58A and the lower reinforcement 58B sandwich the protrusion 56 of the rear floor pan 54 vertically by, for example, welding. Attached to the rear floor pan 54. In this way, the tank reinforcement 58 is attached to the protruding portion 56 of the rear floor pan 54, and as described above, the rear floor pan 54 is connected to the rear portions 42 of the left and right rear side members 20, so The force 58 is connected to the rear portions 42 of the left and right rear side members 20, that is, the vehicle body of the vehicle 10 via the rear floor pan 54.

  The third hydrogen tank 28 is supported by the rear cross member 34 and the tank reinforcement 58 via a pair of left and right tank bands 60 extending in the vehicle longitudinal direction and spaced apart in the vehicle width direction. More specifically, each tank band 60 has a substantially semicircular upper band 62 that is convex upward in a side view of the vehicle, and a substantially semicircular lower band 64 that is convex downward in a side view of the vehicle. The third hydrogen tank 28 is held over the entire circumference by sandwiching the third hydrogen tank 28 between the upper band 62 and the lower band 64. Then, the vehicle front-rear direction front flange 62A of the upper band 62 and the vehicle front-rear direction flange 64A of the lower band 64 are overlapped, and both 62A, 64A are connected to the lower end of the rear cross member 34 via the bolt 19. The flange 62B on the rear side in the vehicle front-rear direction of the upper band 62 and the flange 64B on the rear side in the front-rear direction of the vehicle on the lower band 64 are overlapped with each other. The third hydrogen tank 28 is supported by the rear cross member 34 and the tank reinforcement 58 by fastening together with the lower end portion of the lower reinforcement 58B. As described above, the third hydrogen tank 28 is supported by the tank band 60, and the tank band 60 is fastened to the rear cross member 34 and the tank reinforcement 58 from below so that the third hydrogen tank 28 is fixed to the vehicle body of the vehicle 10. Is done. Further, tank brackets (not shown) are fixed to the rear floor pan 54 on both outer sides of the third hydrogen tank 28 in the vehicle width direction, and both ends of the third hydrogen tank 28 in the vehicle width direction are supported by the tank brackets. A hydrogen tank 28 is fixed to the vehicle body of the vehicle 10.

(Second member and floor cross member)
Furthermore, in the vehicle rear portion structure of the present embodiment, as shown in FIG. 1, the vehicle extends in the vehicle front-rear direction along with the rear portions 42 on the inner side in the vehicle width direction of the rear portions 42 of the left and right rear side members 20. A pair of left and right second members 68 spaced apart in the width direction are provided. As shown in FIG. 2, the second member 68 has a lattice-shaped closed cross section perpendicular to the extending direction, and is an extruded material made of, for example, an aluminum alloy. Each of the second members 68 is connected to both ends in the vehicle width direction of the upper surface 55A of the upper surface 55A of the floor cross member 55 facing upward in the vehicle vertical direction via bolt-fastened second braces 72, respectively. On the other hand, the rear end portion 68B of each second member 68 is connected to the rear bumper force 50 with a bolt or the like (not shown), and is connected to the rear end panel 48 via a rear bracket 69 (see FIG. 4). That is, the second member 68 is connected to the rear side member 20 in the vehicle width direction via the rear end panel 48 and the rear bumper force 50. The second member 68 and the rear portion 42 of the rear side member 20 are connected to each other in the vehicle width direction via a bolt-fastened first brace 70. The deformation trajectory is configured to be easily synchronized. As described above, since the third hydrogen tank 28 is arranged so as to wrap with the rear side member 20 in the vehicle side view, the third hydrogen tank 28 also wraps with the second member 68 in the vehicle side view.

  FIG. 4 is a perspective view schematically illustrating the structure of the rear suspension member 22, the floor cross member 55, and the second member 68. As described above, the left and right second members 68 are connected to both ends in the vehicle width direction of the upper surface 55A of the floor cross member 55 via the bolt-fastened second braces 72, respectively. As shown in FIG. 4, a bulkhead 73 for reinforcing the floor cross member 55 is provided inside the position of the floor cross member 55 where each second member 68 is connected. The bulkhead 73 is formed in a box shape by, for example, bending a sheet metal into a rectangular frame shape opened in the vehicle width direction and then joining a side wall portion 74 facing outward in the vehicle width direction. Further, an upper ridge line 74 </ b> A and a lower ridge line 74 </ b> B are set on the side wall portion 74. The upper ridge line 74A is formed so as to extend substantially horizontally in the vehicle front-rear direction, while the lower ridge line 74B is formed so as to be inclined downward toward the front side in the vehicle front-rear direction. That is, the side wall portion 74 of the bulkhead 73 is configured so that a load is easily transmitted in the vehicle front-rear direction along the upper ridge line 74A, and when a collision load is transmitted during a rear-end collision, the upper ridge line 74A is higher than the lower ridge line 74B. Is configured to buckle first. In other words, the bulkhead 73 is formed such that the proof strength of the upper ridge line 74A in the vehicle front-rear direction is smaller than the proof strength of the lower ridge line 74B in the vehicle front-rear direction, and the upper part is weaker than the lower part with respect to the vehicle front-rear direction load. It is comprised as a deformation | transformation starting point part formed in this. Thus, the floor cross member 55 is configured such that the strength of the upper part is lower than the strength of the lower part at the position where each second member 68 is connected. The bulkhead 73 is disposed so that at least a part thereof overlaps the side rails 30 of the rear suspension member 22 when viewed in the vehicle front-rear direction. Specifically, at least a part of the bulkhead 73 is disposed so as to overlap the load receiving portion 31 when viewed in the vehicle front-rear direction.

  Further, as shown in FIG. 4, the front end portion 68 </ b> A of each second member 68 is provided with a crash bead 76 as a deformation starting point portion on the upper surface side. Accordingly, the front end portion 68A of each second member 68 is formed such that the upper strength is lower than the lower strength. Further, the crash bead 76 is provided so as to cut out a ridge line extending in the vehicle front-rear direction of the end portion of the second member 68 in the vehicle width direction. The position of the crash bead 76 in the vehicle front-rear direction is substantially the same as the position of the connecting portion 20A of the rear side member 20 in the vehicle front-rear direction. Further, at least a part of the front end portion 68A of each second member 68 is disposed so as to overlap the side rail 30 of the rear suspension member 22 when viewed from the front-rear direction of the vehicle body. Specifically, at least a part of the front end portion 68 </ b> A of each second member 68 is disposed so as to overlap the load receiving portion 31 when viewed in the vehicle front-rear direction. In summary, in this embodiment, the four members of the front end portion 68A of the second member 68, the floor cross member 55, the bulkhead 73, and the load receiving portion 31 of the side rail 30 are at least partly, It arrange | positions so that it may overlap in a direction view.

(Auxiliary battery)
As shown in FIGS. 5 and 6, an auxiliary battery 78 as a battery is disposed on the rear side floor panel 52 on the outer side in the vehicle width direction of the rear portion 42 of the rear side member 20 (right side when viewed from the front of the vehicle). Has been. The auxiliary battery 78 is a box-type secondary battery that mainly supplies power to in-vehicle devices such as an ECU and audio. Further, the auxiliary battery 78 is disposed on the outer side in the vehicle width direction of the rear portion 42 in the vicinity of the center portion of the rear portion 42 in the vehicle front-rear direction. And it is arrange | positioned rather than the connection part 20A in the vehicle front-back direction back (refer FIG. 1). The auxiliary battery 78 is disposed behind the third hydrogen tank 28 in the vehicle front-rear direction. More specifically, the center position of the third hydrogen tank 28 in the vehicle front-rear direction is located behind the center position of the third hydrogen tank 28 in the vehicle front-rear direction.

  Further, as shown in FIG. 3, the auxiliary battery 80 is wrapped with the rear portion 42 of the rear side member 20 in a vehicle side view. Furthermore, in the present embodiment, since the second member 68 is provided alongside the rear portion 42 on the inner side in the vehicle width direction of the rear portion 42 of the rear side member 20, the auxiliary battery 78 is the second in the vehicle side view. The member 68 is also wrapped. Furthermore, as shown in FIG. 3, the auxiliary battery 78 is arranged so as to wrap with the third hydrogen tank 28 as viewed from the side of the vehicle. The auxiliary battery 78 is covered with a side box cover 79 and is partitioned from the cargo compartment 21.

(Battery clamp)
Further, as shown in FIGS. 5 and 6, a battery clamp that holds the auxiliary battery 78 vertically with the rear side floor panel 52 from the inner side in the vehicle width direction of the auxiliary battery 78 to the upper part of the auxiliary battery 78. 80 is provided. The battery clamp 80 has an inner end in the vehicle width direction fixed to the upper surface of the rear portion 42 of the rear side member 20 and an L-shaped inner bracket 82 as viewed from the front of the vehicle. The clamp body 84 extends to the upper part of the auxiliary battery 78, and the inner bar 86 that connects the inner bracket 82 and the clamp body 84. The lower end of the inner bar 86 is fixed to the inner bracket 82 by welding or the like, and a screw groove is cut at the upper end. After the auxiliary battery 78 is placed on the battery carrier 88 described later, the vehicle of the clamp main body 84 is mounted. By inserting the inner bar 86 into the hole provided at the inner end in the width direction and tightening the nut 85 from above, the inner bracket 82 and the clamp body 84 are connected. In this way, the auxiliary battery 78 is sandwiched and held between the rear side floor panel 52 and the battery clamp 80 (see FIG. 7). Further, the rear side floor panel 52 and the battery clamp are fixed to the rear portion 42 of the rear side member 20 constituting the vehicle body of the vehicle 10, that is, the auxiliary battery 78 is fixed to the vehicle body of the vehicle 10.

  The clamp main body 84 extends from the inner end in the vehicle width direction to the outer end in the vehicle width direction of the auxiliary battery 78, and a hat shape in which a cross section perpendicular to the extending direction is opened upward. The strength is increased. Further, the clamp main body 84 has a pair of left and right edge portions 84A extending in the vehicle front-rear direction and formed in an L-shaped cross section at both ends in the vehicle width direction on the lower side. As shown in FIG. 5, the edge portion 84 </ b> A suppresses edges at both ends in the vehicle width direction of the box-type auxiliary battery 78 extending in the vehicle front-rear direction, and the auxiliary battery 78 is interposed between the battery clamp 80 and the rear side floor panel 52. Hold.

(Battery carrier)
As shown in FIG. 5, a flat dish-shaped battery carrier 88 on which the auxiliary battery 78 is placed is fixed on the upper side of the rear side floor panel 52. The battery carrier 88 is fixed to the rear side floor panel 52 by being bolted in a recess 90A provided in the bottom 90 thereof. Further, the lower end of the battery carrier 88 is connected to the vehicle width direction outer end portion of the battery carrier 88 at the center in the vehicle longitudinal direction, and extends in the vehicle vertical direction outside the auxiliary battery 78 in the vehicle width direction. An outer connection portion 92 whose upper end is connected to the outer end portion in the vehicle width direction of the clamp main body portion 84 is provided. The outer connection portion 92 has a lower end fixed to the outer end in the vehicle width direction of the battery carrier 88 by welding or the like and formed into a crank shape when viewed from the front of the vehicle, and a lower end fixed to the outer bracket 94 by welding or the like. And an outer bar 96 having a screw groove at the upper end. After the auxiliary battery 78 is placed on the battery carrier 88, the outer bar 96 is inserted into the hole provided in the outer end of the clamp body 84 in the vehicle width direction, and the nut 97 is tightened from the outer bar 96 so that the outer connection is achieved. Part 92 and battery clamp 80 are connected.

(Floor force)
As shown in FIG. 8, the rear side floor panel 52 is fixed to the rear side floor panel 52 at the lower part, and the inner end in the vehicle width direction is fixed to the rear part 42 of the rear side member 20. A floor reinforcement 98 extending outward in the vehicle width direction is disposed below the position where the auxiliary battery 78 is disposed. The floor reinforcement 98 is fixed to the rear side member 20 by welding or the like together with the rear side floor panel 52 at the flange portion 42C at the outer end of the rear portion 42 of the rear side member 20 at the inner end in the vehicle width direction. Further, the floor reinforcement 98 extends to a position below the recess 90 </ b> A where the battery carrier 88 is fixed to the rear side floor panel 52. Further, in the present embodiment, the floor reinforcement 98 extends to the outer end portion of the rear side floor panel 52 along the shape of the rear side floor panel 52.

(Oil cooler bracket)
Under the floor reinforcement 98, an oil cooler bracket 102 provided with a connecting portion 102A for suspending the oil cooler 100 is provided. The oil cooler bracket 102 is welded to the floor reinforcement 98 and the rear side floor panel 52, and covers a part of the floor reinforcement 98 below the battery carrier 78. That is, the oil cooler bracket 102 forms a closed cross section with the floor reinforcement 98 when viewed in the vehicle longitudinal direction. A connection bracket 101 (see FIG. 7) is attached to the connection portion 102A, and the oil cooler 100 is suspended from the oil cooler bracket 102 via the connection bracket 101.

(Action and effect)
Next, the operation and effect of the vehicle rear structure according to this embodiment will be described.

  In the vehicle 10 having the vehicle rear structure according to the present embodiment, the auxiliary battery 78 is disposed on the rear side floor panel 52 outside the rear side member 20 in the vehicle width direction. The main space 21S in the center in the vehicle width direction is not compressed, and the convenience of the luggage compartment 21 is good. Even if the collision object 104 collides from the rear of the vehicle 10 (rear collision) and the collision load is applied to the rear side member 20 from the rear bumper force 50 and the rear side member 20 is deformed, the auxiliary battery 78 and the third hydrogen Since the tank 28 is offset in the vehicle width direction, the auxiliary battery 78 can be prevented from being sandwiched between the third hydrogen tank 28 and the collision object 104. Further, since the auxiliary battery 78 is prevented from being caught between the third hydrogen tank 28 and the collision object 104, a large external force is hardly generated in the auxiliary battery 78, and the battery clamp 80 is not easily deformed. Therefore, the auxiliary battery 78 is held between the battery clamp 80 and the rear side floor panel 52, and the auxiliary battery 78 is fixed to the vehicle body of the vehicle 10.

  Further, when the collision object 104 collides from the rear of the vehicle 10 (rear collision) with the vehicle 10 having the vehicle rear structure according to the present embodiment, the vehicle rear portion 12 is roughly divided into (1) the rear side member 20 side and (2) Two load transmission paths are formed on the second member 68 side.

(1) Behavior in Load Transmission Path on Rear Side Member Side FIG. 8 is a diagram schematically illustrating the behavior of the rear side member 20 and the third hydrogen tank 28 at the time of a rear collision. When the collision object 104 collides with the rear bumper force 50, the load transmitted to the rear side member 20 is transmitted to the rocker 44 through the rear side member 20, and in the process, the rear end portion 46A of the curved portion 46 An impact load is absorbed by deforming the curved portion 46 that curves upwardly in an arch shape while generating a reaction force against the collision load on the rear portion 42 of the rear side member 20. Since the curved portion 46 is curved in an upward arch shape, the upper surface of the rear side member has a smaller radius of curvature than the lower surface at the rear end portion 46A of the curved portion 46. The rear end portion 46A is convex downward, and the rear end portion 42B of the rear portion 42 is pushed upward by the collision object 104 and lifted upward. Thereby, the energy at the time of a rear collision is absorbed stably.

  Further, in the present embodiment, the rear end portion 46A of the curved portion 46 of the rear side member 20 is convex downward, and the rear end portion 42B of the rear portion 42 is deformed so as to be lifted upward so that the energy at the time of rear collision is increased. Since it is stably absorbed, it is difficult for a large external force to be applied to the auxiliary battery 78, and the battery clamp 80 is difficult to deform. At this time, the rear reinforcement 98 reinforces the rear side floor panel 52 below the auxiliary battery 78, and the floor reinforcement 98 is fixed to the rear side member 20 at the inner end in the vehicle width direction. When the end portion 42B is deformed so as to be lifted upward, the auxiliary battery 78 can be lifted together with the rear side floor panel 52 to follow the deformation of the rear side member 20. If the auxiliary battery 78 can follow the deformation of the rear side member 20, the battery clamp 80 is not easily deformed, so that the vehicle body of the vehicle 10 and the auxiliary battery 78 can be kept fixed. At this time, since the auxiliary battery 78 is disposed behind the third hydrogen tank 28, the amount of movement in the vehicle vertical direction with respect to the third hydrogen tank 28 is large. Therefore, the auxiliary battery 78 can be prevented from being sandwiched between the third hydrogen tank 28 and the collision object 104.

  In the present embodiment, the auxiliary battery is formed by forming a closed cross section with the floor reinforcement 98 so that the oil cooler bracket 102 covers a part of the floor reinforcement 98 at the lower part of the floor reinforcement 98. The rear side floor panel 52 below 78 is further reinforced. As a result, the auxiliary battery 78 can be made to follow the deformation of the rear side member 20 and the vehicle body of the vehicle 10 and the auxiliary battery 78 can be maintained in a fixed state.

  In the present embodiment, the outer end portion in the vehicle width direction of the clamp body portion 84 of the battery clamp 80 and the outer end portion in the vehicle width direction of the battery carrier 80 are connected by the outer connection portion 92, so that the rear side member 20, the battery clamp 80, the outer connection portion 92, the battery carrier 88, and the rear side floor panel 52 surround the auxiliary battery 78 in an annular shape. Therefore, auxiliary battery 78 is easily held between battery clamp 80 and rear side floor panel 52, and the fixed state of auxiliary battery 78 to the vehicle body of vehicle 10 is easily maintained.

  Further, in this embodiment, since the auxiliary battery 78 is wrapped with the rear side member 20 in a side view of the vehicle, for example, compared with a case where the auxiliary battery 78 is provided on the rear side member 20, a dead space is generated. Can be suppressed. Further, since the auxiliary battery 78 and the third hydrogen tank 28 are separated by the rear side member 20, it is possible to further suppress the auxiliary battery 78 from being sandwiched between the third hydrogen tank 28 and the collision object 104.

  In the present embodiment, since the auxiliary battery 78 and the third hydrogen tank 28 are also separated by the second member 68, the auxiliary battery 78 is prevented from being sandwiched between the third hydrogen tank 28 and the collision object 104. It can be further suppressed.

  Further, in the present embodiment, the front end portion 42A of the rear portion 42 is connected to the rear end portion 46A of the curved portion 46 of the rear side member 20, and the cross section changes at the front end portion 42A of the rear portion 42. The front end portion 42A of the portion 42 is likely to be a starting point for deformation of the rear side member 20. Therefore, the rear end portion 42B of the rear portion 42 is easily pushed upward by the collision object 104, and the energy at the time of the rear collision is stably absorbed.

  Further, since the rear end portion 42B of the rear portion 42 is deformed so as to be lifted upward and the energy at the time of rear collision is stably absorbed, a large external force is hardly generated in the auxiliary battery 78, and the battery clamp 80 is deformed. Therefore, the auxiliary battery 78 is held between the battery clamp 80 and the rear side floor panel 52, that is, the auxiliary battery 78 is fixed to the vehicle body of the vehicle 10.

  Here, in the vehicle rear portion structure of the present embodiment, the tank reinforcement 58 arranged with the vehicle width direction as the longitudinal direction is connected to the left and right rear portions 42 of the rear side member 20, and the third hydrogen tank 28 is provided. Since the supporting tank band 60 is fastened to the tank reinforcement 58, the rear end portion 42B of the rear portion 42 is lifted upward, so that the third hydrogen tank 28 moves forward and upward. As described above, the third hydrogen tank 28 is allowed to escape to the front, which is far from the collision location, so that the protection performance of the third hydrogen tank 28 can be enhanced.

(2) Behavior in the transmission path on the second member side On the other hand, in the transmission path on the second member 68 side, the front end of the second member 68 is connected to the floor cross member 55. The applied collision load is transmitted to the floor cross member 55 via the second member 68 and then transmitted to the rocker 44 via the rear side member 20.

  Further, when the floor cross member 55 advances by receiving a collision load from the rear side member 20 and the second member 68, the floor cross member 55 comes into contact with the load receiving portion 31 of the side rail 30 of the rear suspension member 22. At this time, the front surface 55B of the floor cross member 55 having a rectangular cross section comes into contact with the load receiving surface 31A. At this time, the rear suspension member 22 generates a reaction force on the floor cross member 55 via the load receiving portion 31 of the side rail 30 with respect to the collision load from the rear of the vehicle, while the central portion 30C of the side rail 30 is Deforms upward at the starting point. Thereby, the energy at the time of a rear collision is absorbed stably.

  Further, in the present embodiment, the floor cross member 55 has a deformation starting point portion in which the strength of the upper portion where the second member 68 is connected is lower than the strength of the lower portion. At the front end, the upper part is formed to be more fragile than the lower part. Therefore, the reaction force generated from the rear suspension member 22 to the floor cross member 55 causes the second member 68 connected to the floor cross member 55 to be bent forward, and the rear end 68B is easily lifted upward. Thereby, the energy at the time of a rear collision is absorbed stably.

  More specifically, the side wall portion 74 of the bulkhead 73 serving as a deformation starting point portion that reinforces the floor cross member 55 is configured so that a load is easily transmitted in the vehicle front-rear direction along the upper ridge line 74A. When transmitted, since the upper ridge line 74A is buckled earlier than the lower ridge line 74B, when a collision load is input to the floor cross member 55 through the second member 68 at the time of rear collision, The compression amount of the upper ridge line 74A is larger than that of the lower ridge line 74B. Thereby, the floor cross member 55 has a larger amount of deformation (compression) in the upper part than in the lower part. At this time, the second member 68 connected to the floor cross member 55 is turned forward, and the rear end 68B is easily lifted upward. Thereby, the energy at the time of a rear collision is absorbed stably.

  The front end 68A of the second member 68 is provided with a crash bead 76 as a deformation starting point so as to cut out a ridge line extending in the vehicle front-rear direction of the vehicle width direction end on the upper surface side of the second member 68. Therefore, the strength of the upper portion is formed lower than the strength of the lower portion, and the compression amount of the front end portion 68A of the second member 68 is larger on the upper surface side than on the lower surface side at the time of rear collision. As a result, the second member 68 is turned forward, and the rear end 68B is easily lifted upward, so that the energy at the time of rear collision is stably absorbed.

  Further, since the second member 68 is connected to the rear portion 42 of the rear side member 20 via the first brace 70, the locus of deformation of the second member 68 and the rear portion 42 at the time of the rear collision is synchronized. The vehicle rear portion 12 can absorb the collision load more stably. When the rear end portion 42B of the rear portion 42 of the rear side member 20 is deformed so as to be lifted upward and the energy at the time of the rear impact is stably absorbed, a large external force is hardly generated in the auxiliary battery 78.

  Furthermore, after securing the necessary energy absorption in the initial stage of the collision, the rear end portion 68B of the second member 68 is lifted so that the intrusion direction (vehicle longitudinal direction) of the collision object 104 is the extension direction of the second member 68. Since they are different, the load transmission amount from the second member 68 to the vehicle front side is reduced. Thereby, it is possible to suppress an excessive load from acting on the transaxle 16 mounted on the rear suspension member 22. Further, it is possible to suppress an excessive load from acting on the HV battery 14 (not shown) disposed on the upper side of the transaxle 16.

  As described above, according to the vehicle rear structure according to the present embodiment, the luggage compartment 21 is easy to use, and the auxiliary battery is interposed between the third hydrogen tank 28 and the collision object 104 at the time of a rear collision of the vehicle 10. 78 can be suppressed, and even if the rear side member 20 is deformed at the time of a rear collision, the battery can be protected by maintaining the auxiliary battery 78 fixed to the vehicle body. That is, it is possible to achieve both usability of the cargo compartment 21 and protection performance of the auxiliary battery 78 at the time of rear collision.

(Supplement of embodiment)
In addition, this invention is not limited to the said embodiment.

  For example, in the above embodiment, the rear side member 20 is provided with the curved portion 46 that curves upwardly in an arch shape, but the rear side member 20 may not be provided with the curved portion 46.

  Further, for example, in the above-described embodiment, the floor reinforcement 98 fixed to the rear side floor panel 52 is provided below the rear side floor panel 52, but the floor reinforcement 98 may not be provided. In the above embodiment, the floor reinforcement 98 extends from the outer flange portion 42C of the rear portion 42 of the rear side member 20 toward the outer side in the vehicle width direction. You may extend toward the vehicle width direction outer side from the part 42C.

  Further, for example, in the above embodiment, the floor side force 98 is fixed to the rear side floor panel 52 at a lower portion, and a closed cross section is formed with the floor reinforcement 98 so as to cover a part of the floor reinforcement 98. Although the oil cooler bracket 102 is provided, the oil cooler bracket 102 may not be provided. Further, the end of the closed cross section formed between the oil cooler bracket 102 and the floor reinforcement 98 may be opened.

  Further, for example, in the above embodiment, the battery carrier 88 on which the auxiliary battery 78 is placed is provided between the auxiliary battery 78 and the rear side floor panel 52, but the battery carrier 88 may not be provided. . Moreover, in the said embodiment, although the outer side connection part 92 which connects the vehicle width direction outer end part of the battery clamp 80 and the vehicle width direction outer end part of the battery carrier 88 is provided, it does not need to be provided.

  Further, for example, in the above embodiment, the auxiliary battery 78 and the rear side member 20 are wrapped in a vehicle side view, but may not be wrapped.

  For example, in the above embodiment, the second member 68 is provided on the inner side in the vehicle width direction of the rear side member 20, but the second member 68 may not be provided.

  Further, for example, in the above-described embodiment, the rear side member 20 includes the front portion 40 where the bending portion 46 is formed, and the rear portion 46A connected to the front portion 40 at the rear end portion 46A of the bending portion 46 and extending rearward in the vehicle front-rear direction. However, the present invention is not limited to this, and the rear side member 20 may be integrally formed.

  Further, for example, in the above-described embodiment, the auxiliary battery 78 that supplies power to the in-vehicle device is disposed on the rear side floor panel 52 outside the rear side member 20 in the vehicle width direction. HV batteries may be arranged.

  Further, for example, in the above-described embodiment, the position in the vehicle front-rear direction where the side rail 30 of the rear suspension member 22 is disposed substantially coincides with the position of the curved portion 46 of the rear side member 20 in the vehicle front-rear direction. The position in the vehicle front-rear direction where the side rails 30 are arranged is not necessarily limited to the position in the vehicle front-rear direction of the curved portion 46 of the rear side member 20.

  Further, for example, in the above embodiment, the bulkhead 73 whose upper part is weaker than the lower part is arranged inside the floor cross member 55 at the position where the second member 68 is connected to the floor cross member 55, and the floor cross member 55. Although the upper part is formed so as to be more fragile than the lower part, it is not limited to this. A crush bead may be provided on the upper surface 55A of the floor cross member 55, and the deformation starting point may be formed so that the upper part of the floor cross member 55 becomes weaker than the lower part at a position where the second member 68 is connected.

  Further, for example, in the above-described embodiment, the bulkhead 73 is provided in the cross section of the floor cross member 55, and the upper ridge line 74A of the side wall portion 74 of the bulkhead 73 is formed to extend substantially horizontally in the vehicle front-rear direction. On the other hand, the lower ridge line 74B is formed so as to be inclined downward as it goes to the front side in the vehicle front-rear direction, but is not limited thereto. The upper ridge line 74A is notched with a bead, and the ridge strength of the upper ridge line 74A in the vehicle front-rear direction may be formed to be weaker than the proof strength of the lower ridge line 74B in the vehicle front-rear direction. Alternatively, the bulkhead 73 may be formed such that the lower ridge line 74B is provided, while the upper ridgeline 74A is not formed, and the upper part of the bulkhead 73 is weaker than the lower part.

  Further, for example, in the above embodiment, the crash bead 76 is provided on the upper surface of the front end portion of the second member 68, but the crash bead 76 may not be provided.

  Further, for example, in the above embodiment, the second member 68 is connected to the rear portion 42 of the rear side member 20 via the first brace 70. However, the present invention is not limited to this, and the second member 68 is not limited to the rear side member 20. The rear part 42 may not be connected.

Further, for example, in the above-described embodiment, the second member 68 is formed of an extruded material made of an aluminum alloy in which a cross section perpendicular to the extending direction is formed in a lattice-like closed cross section, but is not limited thereto. The second member 68 may be formed by combining two steel hat-shaped cross-section members to form a closed cross-section.

  When the second member 68 and the rear side member Rr portion 13 are connected by welding via the rear floor pan 54, the left and right second members 23 are connected to the left and right rear side members Rr portion as shown in FIG. Thus, the third hydrogen tank 5 is positioned between the left and right second members 23.

  As mentioned above, although the vehicle rear part structure which concerns on embodiment of this invention was demonstrated, in the range which does not deviate from the summary of this invention, of course, it can implement in a various aspect.

  Moreover, it is also possible to grasp the vehicle rear structure according to the present embodiment described above from a different viewpoint. For example, the problem (purpose) to be solved by the vehicle rear structure according to the present embodiment can be regarded as “controlling deformation of the vehicle rear part at the time of rear collision and stabilizing energy absorption at the time of rear collision”.

If a subject is caught as mentioned above, the invention as a means for solving a subject will be as follows, for example.
"A pair of left and right rear side members that form part of the vehicle body at the rear of the vehicle, extend in the vehicle longitudinal direction, and are spaced apart in the vehicle width direction;
A floor cross member spanned between the left and right rear side members and joined to the left and right rear side members from the inside in the vehicle width direction;
A pair of left and right second members connected to the pair of rear side members in the vehicle width direction and having front ends connected to the floor cross member, extending in the vehicle longitudinal direction inside the pair of rear side members in the vehicle width direction;
At least one of the position where the second member 68 of the floor cross member is connected or the front end of the second member, the deformation starting point portion formed weaker than the lower portion,
A vehicle rear structure having: "

  According to the above configuration, at least one of the position where the second member 68 of the floor cross member is connected or the front end of the second member has the deformation starting point portion formed more weakly than the lower portion. At the time of rear collision, the amount of compression on the upper surface side becomes larger than the lower surface side of the front end portion of the second member. As a result, the second member 68 is bent forward and the rear end of the second member is lifted upward. Since the rear side member is connected to the second member in the vehicle width direction, the deformation of the rear side member is synchronized with the deformation of the second member and is deformed so that the rear end portion is lifted. In this way, the deformation of the rear part of the vehicle body is controlled, and the energy at the time of rear collision is stably absorbed.

DESCRIPTION OF SYMBOLS 12 Vehicle rear part 14 HV battery 16 Transaxle 20 Rear side member 22 Rear suspension member 28 3rd hydrogen tank 30 Side rail 34 Rear cross member 40 Front part 42 Rear part 46 Curved part 52 Rear side floor panel (floor panel)
54 Rear floor pan 55 Floor cross member 58 Tank reinforcement 68 Second member 78 Auxiliary battery (battery)
80 Battery clamp 92 Outer connection 98 Floor reinforcement 100 Oil cooler 102 Oil cooler bracket (bracket)

Claims (7)

A pair of left and right rear side members that constitute part of the vehicle body at the rear of the vehicle, each extending in the vehicle longitudinal direction and spaced apart in the vehicle width direction;
A hydrogen tank disposed between the pair of left and right rear side members and fixed to the vehicle body;
A floor panel that is disposed on the vehicle width direction outer side of the rear portion of the vehicle, the vehicle width direction inner end is fixed to the rear side member, and extends to the vehicle width direction outer side than the rear side member;
A battery disposed on the floor panel outside the rear side member in the vehicle width direction;
A battery clamp that has an inner end in the vehicle width direction fixed to the rear side member and extends outward in the vehicle width direction to the upper portion of the battery, and holds the battery between the upper and lower sides with the floor panel;
A vehicle rear structure. The rear side member includes a curved portion that curves in an upward convex shape in an arch shape when viewed from the side of the vehicle, and extends in the vehicle front-rear direction to the rear in the vehicle front-rear direction with respect to the curved portion. On the outside in the vehicle width direction of the rear side member on the rear side in the front-rear direction, disposed on the floor panel,
The lower end of the floor panel is fixed to the floor panel, the inner end in the vehicle width direction is fixed to the rear side member, and extends outward in the vehicle width direction to the position where the battery is disposed on the floor panel. The vehicle rear structure according to claim 1, wherein the vehicle rear structure has an existing floor reinforcement.   The vehicle rear structure according to claim 2, further comprising a bracket that is fixed to the floor reinforcement at a lower portion of the floor reinforcement and forms a closed cross section with the floor reinforcement as viewed in the vehicle longitudinal direction. A battery carrier fixed between the battery and the floor panel and on which the battery is mounted;
An outer connection extending in the vehicle vertical direction outside the battery in the vehicle width direction, having an upper end connected to the outer end in the vehicle width direction of the battery clamp, and a lower end connected to the outer end in the vehicle width direction of the battery carrier And
The vehicle rear part structure according to claim 1, comprising:   The vehicle rear part structure according to claim 1, wherein the battery and the rear side member are wrapped in a side view of the vehicle.   The vehicle rear structure according to claim 5, further comprising a pair of left and right second members extending in the vehicle front-rear direction on the inner side in the vehicle width direction of the pair of rear side members.   The rear side member includes a front member in which the curved portion is formed, and a rear member connected to the front member at a rear end portion of the curved portion and extending rearward in the vehicle front-rear direction. The vehicle rear structure as described.