JP2020111068A - Rear part vehicle body structure of vehicle - Google Patents

Abstract

To protect an auxiliary machine disposed at a vehicle body rear part and improve safety of occupants in a vehicle cabin during a rear collision in a vehicle including a rear sub frame disposed below a rear side frame.SOLUTION: In a rear sub frame 50 disposed below a rear side frame 2, the vehicle body front side is provided branched into a an upper branch frame part 121 extending to the vehicle body front side and the vehicle body upper side and a lower branch frame part 122 extending to the vehicle body front side and the vehicle body lower side. The vehicle body front side of the upper branch frame part 121 is connected to a vehicle body upper frame member 2 disposed at the vehicle body upper side relative to a vehicle cabin floor part, and the vehicle body front side of the lower branch frame part 122 is connected to a vehicle body lower frame member 30 disposed at the vehicle body lower side relative to the vehicle cabin floor part 10.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear body structure, and more particularly to a vehicle rear body structure including a rear sub-frame arranged below a rear side frame.

In vehicles such as automobiles, a rear subframe for supporting an engine, a transmission, etc. is disposed below a rear side frame extending in the vehicle front-rear direction at the rear of the vehicle body, and the rear subframe is connected to the rear side frame. Are known.

For example, Patent Document 1 discloses a rear subframe provided below a rear side frame at a rear portion of a vehicle body, and the rear subframe is connected to the rear side frame. For example, in Patent Document 2, an engine mounting rear subframe and a transmission mounting rear subframe are disposed below a rear portion of a vehicle body, and the engine mounting rear subframe is fixed to the vehicle body frame and the transmission mounting rear subframe. Is fixed to the rear subframe for mounting the engine and the vehicle body frame.

JP, 2016-43829, A Japanese Utility Model Publication No. 62-8880

In vehicles such as automobiles, it is required to improve the safety of passengers in the passenger compartment when a collision load is applied from the rear of the vehicle during a rear-end collision (rear collision). Even in a vehicle provided with a frame, it is required to improve the safety of passengers in the passenger compartment in the event of a rear collision.

Further, in a vehicle such as an electric vehicle in which a rear subframe is disposed below a rear side frame in the rear part of the vehicle body, when auxiliary components such as an engine, a generator and a fuel tank, which are important safety parts, are disposed in the rear part of the vehicle body, When a collision load is applied from the rear of the vehicle body at the time of a rear-end collision, it is required to protect the auxiliary equipment arranged at the rear portion of the vehicle body.

Therefore, the present invention, in a vehicle having a rear sub-frame disposed below a rear side frame, protects an auxiliary machine disposed at the rear part of the vehicle body at the time of a rear collision and improves the safety of passengers in the vehicle compartment. An object of the present invention is to provide a rear body structure of a vehicle capable of performing the above.

In order to solve the above-mentioned problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application is a rear part of a vehicle including a rear side frame extending in the vehicle front-rear direction in a vehicle body rear part, and a rear subframe disposed below the rear side frame and extending in the vehicle front-rear direction. In the vehicle body structure, the rear subframe includes an upper branch frame portion extending toward a vehicle front side and an upper vehicle body side from a front side of the rear subframe and a lower branch frame portion extending toward a vehicle body front side and a vehicle body lower side. The vehicle body front side of the upper branch frame portion that is branched is connected to a vehicle body upper frame member that is disposed on the vehicle body upper side of the vehicle compartment floor portion that forms the floor surface of the vehicle compartment, and the lower branch frame portion It is characterized in that the front side of the vehicle body is connected to a vehicle body lower side frame member arranged below the vehicle body floor portion of the vehicle body.

In the invention according to claim 2, in the invention according to claim 1, a kick-up portion extending from a rear end portion of the vehicle compartment floor portion to an upper side of a vehicle body, and a kick-up portion extending from the kick-up portion to a vehicle body rear side. And a rear floor portion on which the rear side frame is disposed, the vehicle body upper frame member being the rear side frame disposed on the rear floor portion extending from the kick-up portion to a vehicle rear side, The vehicle body lower frame member is a vehicle body lower frame member that is disposed below the vehicle body with respect to the kick-up portion and is connected to the vehicle compartment floor portion.

The invention according to claim 3 is the battery frame according to the invention according to claim 1 or 2, wherein the vehicle body lower frame member supports a battery arranged below the vehicle compartment floor portion. Is characterized in that

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the lower branch frame portion of the rear sub-frame is a pair of left and right extending in the vehicle front-rear direction. It is characterized in that it is provided so as to extend in a substantially horizontal direction on the lower side of the vehicle body of a torsion beam that extends in the vehicle width direction by connecting trailing arms.

According to the invention of claim 1 of the present application, the rear sub-frame disposed below the rear side frame includes an upper branch frame portion whose front side extends to the front side of the vehicle and an upper side of the vehicle, and a front side of the vehicle and a lower side of the vehicle. The vehicle body front side of the upper side branch frame portion is connected to a vehicle body upper side frame member disposed above the vehicle compartment floor portion, and is provided so as to branch to a lower side branch frame portion. The vehicle body front side is connected to a vehicle body lower frame member that is arranged on the vehicle body lower side of the vehicle compartment floor portion.

As a result, when a collision load is applied to the rear end of the rear sub-frame from the rear of the vehicle body at the time of a rear-end collision, the load input to the rear sub-frame is transferred to the vehicle body through the upper branch frame portion that extends toward the vehicle body front side and the vehicle body upper side. It is possible to transmit to the upper frame member and to the lower frame member of the vehicle body through the lower branch frame portion extending to the front side of the vehicle body and the lower side of the vehicle body. Therefore, it is possible to disperse the load input to the rear subframe to the vehicle body front side and the vehicle body upper side and the vehicle body lower side to suppress the deformation of the rear subframe. When the auxiliary machine is arranged on the side, the auxiliary machine arranged at the rear part of the vehicle body can be protected and the safety of the occupant in the vehicle compartment can be improved.

According to the second aspect of the invention, the vehicle body upper frame member is a rear side frame disposed on the rear floor portion extending from the kick up portion to the vehicle rear side, and the vehicle body lower frame member is the kick up portion. By being the vehicle body lower frame member that is arranged on the vehicle body lower side of the vehicle body and is connected to the vehicle compartment floor portion, the load input to the rear sub-frame at the time of a rear collision is transmitted from the vehicle body upper frame member to the vehicle body upper portions. Can be transmitted to and dispersed from the lower frame member of the vehicle body to each part of the vehicle body on the lower side of the vehicle body, and the above effect can be effectively obtained.

According to the third aspect of the present invention, the vehicle body lower frame member is a battery frame that supports the battery arranged below the vehicle compartment floor portion, and thus is input to the rear subframe at the time of a rear collision. The load can be transmitted to the battery frame to be dispersed and can be dispersed in a wide range.

Further, according to the invention of claim 4, the lower branch frame portion of the rear sub-frame is connected to the pair of left and right trailing arms and extends substantially horizontally below the vehicle body of the torsion beam extending in the vehicle width direction. With such a configuration, it is possible to improve the support rigidity of the torsion beam suspension apparatus and the bending rigidity of the lower branch frame portion while ensuring the movable range of the torsion beam.

FIG. 1 is a bottom view of a vehicle body to which a rear vehicle body structure according to an embodiment of the present invention is applied. 1 is a side view of a vehicle body to which a rear vehicle body structure according to an embodiment of the present invention is applied. FIG. 2 is a bottom view of the vehicle body shown in FIG. 1 with a sub-frame unit and a battery frame removed. FIG. 2 is a bottom view of the vehicle body shown in FIG. 1 with a part of the subframe unit removed. FIG. 4 is a sectional view of the vehicle body taken along line Y5-Y5 in FIG. 3. FIG. 2 is a sectional view of the vehicle body taken along line Y6-Y6 in FIG. 1. It is a perspective view of a sub-frame unit. It is a perspective view of a sub-frame unit from which an auxiliary machine is removed. It is a side view of the sub-frame unit shown in FIG. It is a bottom view of the sub-frame unit shown in FIG. FIG. 6 is a perspective view showing a frame connection connecting portion that connects a rear subframe and a rear side frame. It is a perspective view showing a branch frame member of a sub-frame unit. It is a perspective view showing a frame connecting part which connects a rear subframe and a battery frame. FIG. 7 is another perspective view showing a frame connecting portion that connects the rear subframe and the battery frame. It is a perspective view showing a lower frame member of a sub-frame unit. FIG. 11 is a cross-sectional view of the rear sub-frame unit taken along line Y16-Y16 in FIG. It is an explanatory view for explaining attachment of an auxiliary machine to a rear subframe. It is explanatory drawing for demonstrating the rear side support hanger which supports a silencer. It is explanatory drawing for demonstrating the movement of the silencer at the time of a rear impact.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a bottom view of a vehicle body to which a vehicle rear body structure according to an embodiment of the present invention is applied, and FIG. 2 is a side view of a vehicle body to which a vehicle rear body structure according to an embodiment of the present invention is applied. 1 is a bottom view of the vehicle body shown in FIG. 1 with the subframe unit and the battery frame removed, FIG. 4 is a bottom view of the vehicle body shown in FIG. 1 with a part of the subframe unit removed, and FIG. 5 shows Y5 in FIG. FIG. 6 is a sectional view of the vehicle body taken along the line -Y5, and FIG. 6 is a sectional view of the vehicle body taken along the line Y6-Y6 in FIG.

A vehicle body 1 to which a rear body structure of a vehicle according to an embodiment of the present invention is applied is a vehicle body of an electric vehicle or the like that includes a drive motor as a drive source for driving the vehicle and a battery that stores electric power supplied to the drive motor. The vehicle body 1 is provided with a range extender device that includes a generator that generates electric power for traveling supplied to the battery and an engine as a drive source that drives the generator, and that generates power with the engine to improve the cruising range. ing. In the vehicle body 1, a drive motor is provided at the front portion of the vehicle body, a battery is provided below the vehicle compartment floor portion, and a range extender device is provided at the rear portion of the vehicle body.

As shown in FIG. 1 to FIG. 6, a vehicle body 1 includes a pair of left and right rear side frames 2 extending in the vehicle front-rear direction at a vehicle rear portion, and below the left and right rear side frames 2 along the left and right rear side frames 2 in the vehicle front-rear direction. And a rear sub-frame 50 extending to the. The rear side frame 2 and the rear subframe 50 are formed by plate-shaped members made of a metal material.

In the rear part of the vehicle body, a rear floor part 3 which is a rear floor panel that is installed on the left and right rear side frames 2 and extends in the vehicle front-rear direction, and a first floor installed on the lower surface side of the rear floor part 3 between the left and right rear side frames 2 The cross member 4 is provided.

The rear floor 3 has an opening 3a for disposing a range extender device 40 in which a generator 41 for generating traveling electric power supplied to the battery 20 and an engine 42 for driving the generator 41 are integrally assembled. The first cross member 4 is formed on the vehicle body front side of the opening 3a.

The rear side frame 2 is formed in a substantially U-shaped cross section, is attached to the lower surface side of the rear floor section 3, and cooperates with the rear floor section 3 to be formed in a substantially quadrangular closed cross section extending in the vehicle front-rear direction. ing. The first cross member 4 is formed in a substantially hat-shaped cross section, is attached to the lower surface side of the rear floor part 3, and is formed in a closed cross-sectional shape having a substantially rectangular cross-section extending in the vehicle width direction in cooperation with the rear floor part 3. Has been done.

On the vehicle body rear side of the left and right rear side frames 2, a side frame side bumper rain 5 arranged in a rear bumper (not shown) extending in the vehicle width direction is mounted as a load absorbing portion extending in the vehicle body front-rear direction, respectively. A crush can 6 is provided.

As shown in FIG. 5, the crush can 6 has a closed polygonal cross-section having a polygonal cross-section, more specifically a cross-shape, which is larger than a substantially square cross-section in an orthogonal cross-section that is substantially orthogonal to the axial direction that is the vehicle front-rear direction. Has a closed cross-section 6a formed therein and a plurality of recesses 6b extending in a direction substantially orthogonal to the axial direction, and is crushed and deformed so as to be folded when a collision load is applied from the rear of the vehicle body to absorb the collision load. It is like this.

The crush can 6 is integrally formed in a closed cross-sectional shape, but has a first plate-shaped member formed to project outward in the vehicle width direction and a convex section in the vehicle width direction. It is also possible to join the second plate-shaped member that is formed so as to protrude to the above so as to form a cross-shaped cross section.

As shown in FIG. 2, the crush can 6 includes a first plate member 7 fixed to the crush can 6 by welding or the like and extending in a direction substantially orthogonal to the front-rear direction of the vehicle body, and a first plate member 7 fixed to the rear side frame 2 by welding or the like. The second plate member 8 extending in a direction substantially orthogonal to the front-rear direction is joined to the rear side frame 2 by being fastened with bolts and nuts.

In the vehicle body 1, the rear side frame 2 is formed to have a closed cross section in cooperation with the rear floor portion 3, but the rear side frame 2 may be formed to have a substantially square cross section and a closed cross section. Further, although the crash can 6 is provided on the rear side of the rear side frame 2 via the first plate member 7 and the second plate member 8, the crash can 6 is formed integrally with the rear side frame 2. Good.

In the vehicle body 1, the load absorbing portion of the rear side frame 2 is set to have a lower strength against axial compression than the other portions of the rear side frame 2 by the crash can 6, but the load absorbing portion 6 of the rear side frame 2 is formed. It is also possible to reduce the plate thickness of the steel plate to be set to have low strength against axial compression.

The front end portion of the rear side frame 2 is superposed and joined to the rear end portion of the kick-up frame 9 which is inclined outward in the vehicle width direction and downward in the vehicle body as it goes to the front side of the vehicle body. , Is connected between the left and right side sills 11 and is connected to a second cross member 12 extending in the vehicle width direction. The left and right side sills 11 are arranged so as to extend in the vehicle front-rear direction on both sides in the vehicle width direction of a vehicle compartment floor portion 10 formed of a front floor panel forming a floor surface of the vehicle compartment.

The kick-up frames 13 are provided on the left and right kick-up frames 9. The kick-up parts 13 are constructed by kick-up panels 13 extending obliquely upward from the rear end of the passenger compartment floor 10 toward the vehicle body rear side. A rear floor portion 3 is provided so as to extend to the rear side of the vehicle body.

The kick-up frame 9 has a substantially hat-shaped cross section, is attached to the lower surface side of the kick-up portion 13, and cooperates with the kick-up portion 13 to have a substantially rectangular cross-section that extends in the vehicle front-rear direction and has a closed cross-sectional shape. ing. The second cross member 12 is formed into a substantially hat-shaped cross section, is attached to the lower surface side of the vehicle interior floor portion 10, and cooperates with the vehicle interior floor portion 10 to extend in the vehicle width direction. Is formed in.

As shown in FIG. 3, a floor tunnel portion 14 that extends in the vehicle front-rear direction in the vehicle width direction center side and bulges toward the vehicle body upper side is formed in the vehicle compartment floor portion 10, and the floor tunnel portion 14 and the left and right side sills are formed. A floor frame 15 extending in the front-rear direction of the vehicle body is attached substantially in the center between 11 and 11, and tunnel rains 16 are attached to both sides of the floor tunnel portion 14 in the vehicle width direction. The floor frame 15 and the tunnel rain 16 are formed in a hat shape in cross section and are joined to the passenger compartment floor portion 10.

In the vehicle body 1, the battery 20 is arranged below the passenger compartment floor portion 10. As shown in FIG. 6, the battery 20 is attached to the battery frame 30 that supports the battery 20 while being attached to the battery tray 21, and the battery frame 30 is connected to the vehicle compartment floor portion 10 to attach to the vehicle body 1. It is supported.

The battery frame 30 includes a front frame (not shown) that is disposed on the front side of the vehicle body and extends in the vehicle width direction, a rear frame 31 that is disposed on the rear side of the vehicle body and extends in the vehicle width direction, and both sides of the front frame in the vehicle width direction. The rear frame 31 is provided with both side frames 32 connected to both sides in the vehicle width direction and extending in the vehicle front-rear direction. The side frames 32 on both sides are arranged below the left and right floor frames 15 in the vehicle body. It is attached to the floor frame 15.

As shown in FIG. 6, each of the front frame, the rear frame 31, and the side frames 32 on both sides includes an upper frame 33 having a substantially L-shaped cross section that constitutes an upper side of the vehicle body of the battery frame 30 and a lower side of the vehicle body of the battery frame 30. And a lower frame 34 having a substantially L-shaped cross-section that constitutes the above, and the upper frame 33 and the lower frame 34 are joined together to form a substantially quadrangular cross-section with a closed cross-section. The battery frame 30 is provided with a flange portion 30a extending substantially horizontally inward of the vehicle width direction, the battery tray 21 is attached to the flange portion 30a, and the battery 20 is supported by the battery frame 30.

The battery frame 30, specifically, the side frame 32 is arranged substantially along the floor frame 15 and is connected to the floor frame 15. As shown in FIG. 6, in the frame connecting portion 35 that connects the battery frame 30 and the floor frame 15, the bottom surface portion 15a of the floor frame 15 is overlapped with the upper surface portion 30b of the battery frame 30, and the bolt B1 and the nut N1 are used. Are linked together. A plurality of frame connecting portions 35 are provided in the vehicle body front-rear direction of the side frame 32.

In the vehicle body 1, a range extender device 40 including a generator 41 and an engine 42 is arranged at the rear portion of the vehicle body. The range extender device 40 is an auxiliary device that is an important safety component because the generator 41 uses a high voltage, is arranged in the opening 3a of the rear floor part 3, and is located above the rear floor part 3 and below the vehicle body. It is provided so as to project to the side.

In the rear part of the vehicle body, the exhaust pipe 43 extending from the engine 42 is further provided with a silencer 44 as an exhaust system component that reduces noise when exhausting the exhaust of the engine 42 to the atmosphere and a catalyst device 45 provided with a catalyst for purifying the exhaust of the engine 42. Is provided. The silencer 44 and the catalyst device 45 are auxiliary devices that are not important safety parts, and are arranged so as to extend in the vehicle width direction on the lower floor side of the rear floor part 3, and the catalyst device 45 is provided on the rear side of the vehicle body of the range extender device 40. The silencer 44 is arranged on the vehicle body rear side of the catalyst device 45. The silencer 44 and the catalyst device 45 are integrally connected by a connecting member 46.

Auxiliary devices arranged at the rear of the vehicle body, specifically, the range extender device 40, the silencer 44, and the catalyst device 45 are integrally assembled to the rear subframe 50 to form a subframe unit 60 that is an integrated unit. The unit 60 is assembled to the vehicle body 1 as a whole. In this way, by forming the auxiliary units 40, 44, 45 and the rear subframe 50 arranged at the rear of the vehicle body into the integrated unit 60, they can be easily assembled to the vehicle body 1, and productivity and safety during vehicle body manufacturing can be improved. It is possible to improve the sex.

The rear part of the vehicle body also has a pair of left and right trailing arms (not shown) extending in the vehicle front-rear direction, and a torsion beam 17 (see a broken line in FIG. 2) extending in the vehicle width direction by connecting the pair of left and right trailing arms. A torsion beam type suspension device is provided. In the vehicle body 1, the torsion beam 17 is provided on the vehicle body front side of the range extender device 40, on the vehicle body rear side of the battery frame 30, and on the vehicle body upper side of the lower frame member 71 of the rear sub-frame 50, which will be described later.

7 is a perspective view of the sub-frame unit, FIG. 8 is a perspective view of the sub-frame unit from which accessories have been removed, FIG. 9 is a side view of the sub-frame unit shown in FIG. 8, and FIG. 10 is shown in FIG. It is a bottom view of a sub-frame unit. As shown in FIGS. 7 to 10, the subframe unit 60 is configured by integrally assembling the range extender device 40, the silencer 44, and the catalyst device 45 to the rear subframe 50.

The rear sub-frame 50 is connected to the upper frame member 51 extending in the vehicle front-rear direction along the rear side frame 2, and is coupled to the upper frame member 51 from the vehicle body front-rear center side of the upper frame member 51 toward the vehicle front side and the vehicle body lower side. A branch frame member 61 that branches to extend is provided, and a lower frame member 71 that is disposed on the vehicle body lower side of the upper frame member 51 and extends substantially horizontally from the branch frame member 61 to the vehicle body front side.

The sub-frame side bumper rain 18 arranged in a rear bumper (not shown) extending in the vehicle width direction is also connected to the rear sub-frame 50, and the vehicle body rear sides of the left and right upper frame members 51 are both end portions of the sub-frame side bumper rain 18. Are connected to each. The rear subframe 50 is formed symmetrically in the vehicle width direction.

The upper frame member 51 extends in the vehicle front-rear direction along the left and right rear side frames 2 and the left and right upper frame portions 52 that extend in the vehicle width direction and connect the left and right upper frame portions 52 to each other in the vehicle width direction center side. The upper cross portion 53 is provided.

The upper frame portion 52 is formed in a closed cross-sectional shape, extends toward the vehicle body rear side from the range extender device 40, and absorbs the collision load when the collision load from the vehicle body rear side to the vehicle body rear side of the range extender device 40 acts. 54 is provided.

As shown in FIG. 8, the load absorbing portion 54 includes a front load absorbing portion 54a arranged on the front side of the vehicle body and a rear load absorbing portion 54b arranged on the rear side of the vehicle body with respect to the front load absorbing portion 54a. The front load absorbing portion 54a and the rear load absorbing portion 54b are formed in the same closed cross section in an orthogonal cross section that is substantially orthogonal to the vehicle front-rear direction, and like the crush can 6, the closed cross section is formed in a substantially cross shape. have. The rear load absorbing portion 54b is formed of a steel plate having a thickness smaller than that of the front load absorbing portion 54a, and is set to have a lower strength against axial compression.

Each of the front load absorbing portion 54a and the rear load absorbing portion 54b is not limited to this, but the first plate-shaped member and the vehicle width formed to protrude outward in the vehicle width direction in a convex cross-section. The second plate-shaped member formed so as to project inwardly in the direction of the cross section is joined to form a substantially cross-shaped cross section.

In the vehicle body 1, the silencer 44 and the catalyst device 45 are located at a position where the load absorber 54 of the rear sub-frame 50 overlaps the load absorber 54 on the front side of the vehicle, specifically, the front load absorber 54a in the vehicle longitudinal direction. It is provided.

The upper frame portion 52 also includes a front frame portion 55 on the front side of the vehicle body with respect to the load absorbing portion 54. The front frame portion 55 is formed such that the rear side of the vehicle body has a closed hexagonal cross section and the front side of the vehicle body has a substantially square cross section. It has a closed cross section.

As shown in FIG. 4, the front frame portion 55 extends outward in the vehicle width direction toward the front side of the vehicle body, and is connected to the front side of the rear side frame 2 by means of bolts and nuts. The front frame portion 55 is formed of a steel plate having a larger thickness than the front load absorbing portion 54a and the rear load absorbing portion 54b, and is set to have high strength against axial compression.

As shown in FIG. 2, the side frame-side load absorbing portion 6 provided on the rear side frame 2 and the sub-frame-side load absorbing portion 54 provided on the rear sub-frame 50 are located behind the sub-frame-side load absorbing portion 54. The end portion is arranged on the front side of the vehicle body with respect to the rear end portion of the side frame side load absorbing portion 6, and the front end portion of the subframe side load absorbing portion 54 is arranged on the front side of the vehicle body with respect to the front end portion of the side frame side load absorbing portion 6. It is provided to be done.

The upper frame portion 52 is also provided with a plurality of frame connecting portions 56 that connect the rear sub-frame 50 and the rear side frame 2, and the plurality of frame connecting portions 56 are provided apart from each other in the vehicle body front-rear direction. The vehicle body 1 is provided with a front frame connecting portion 56a and a rear frame connecting portion 56b which connect the load absorbing portion 54 of the rear sub-frame 50 and the rear side frame 2.

FIG. 11 is a perspective view showing a frame connecting member that connects the rear sub-frame and the rear side frame, and shows the frame connecting member 80 that constitutes the rear frame connecting portion 56b. In the rear frame connecting portion 56b, the frame connecting member 80 connects the rear sub-frame 50 and the rear side frame 2 arranged near the rear sub-frame 50.

As shown in FIG. 11, the frame connecting member 80 has an upper frame 81 having a substantially U-shaped cross section that constitutes the upper side of the vehicle body of the frame connecting member 80 and a substantially U-shaped cross section that constitutes the lower side of the vehicle body of the frame connecting member 80. A peripheral wall portion 83, which is joined to the lower frame 82 and is formed in a closed cross section having a substantially rectangular cross section in an orthogonal cross section orthogonal to the vehicle width direction, and a load transmission portion which is disposed in the peripheral wall portion 83 and extends in the vehicle longitudinal direction. And 84.

The peripheral wall portion 83 includes an upper surface portion 83a, a lower surface portion 83b, and side surface portions 83c on both sides in the vehicle front-rear direction, and is formed in a closed cross-sectional shape. The load transmitting portion 84 is formed by joining a first plate-shaped member 85 having a convex cross-section and a second plate-shaped member 86 having a convex cross-section to a closed cross-section 84a having a substantially cross-shaped cross section. have.

In the load transmission part 84, the closed cross-section part of the front load absorption part 54a of the rear sub-frame 50 and the closed cross-section part 84a of the rear load absorption part 54b are formed in the same shape. The load transmitting portion 84 is located on the front side of the peripheral wall portion 83 in the vehicle body with the side surface portions 85a on both sides of the first plate member 85 and the side surface portions 86a on both sides of the second plate member 86 being joined. The front side of the vehicle is abutted and joined, and the rear side of the load transmitting portion 84 is abutted and joined to the rear side of the peripheral wall portion 83.

Bolt insertion holes 83d are formed in the upper surface portion 83a and the lower surface portion 83b on the outer side in the vehicle width direction of the frame connecting member 80, and the bolts B2 are inserted in a substantially cylindrical shape corresponding to the bolt insertion holes 83d. A tubular member 87 that is fixed to the upper surface portion 83a.

The frame connecting member 80 includes the front load absorbing portion 54a such that the closed cross sectional portion 84a of the load transmitting portion 84 is aligned with the closed cross sectional portion of the front load absorbing portion 54a and the closed cross sectional portion of the rear load absorbing portion 54b in the vehicle longitudinal direction. And the rear load absorbing portion 54b, and is joined and connected to the front load absorbing portion 54a and the rear load absorbing portion 54b.

As shown in FIG. 3, the frame connecting member 80 also has a bolt insertion hole 2b provided in the lower surface portion 2a of the rear side frame 2 and a bolt insertion hole 83d provided in the upper surface portion 83a of the frame connecting member 80 corresponding to the rear side. The bolt B2 is connected to the rear side frame 2 by being screwed into a nut (not shown) welded to the upper side of the lower surface 2a of the rear side frame 2 on the upper side of the vehicle body while being arranged on the lower side of the vehicle body of the frame 2.

Also in the front frame connecting portion 56a, the rear sub-frame 50 and the rear side frame 2 are connected by the frame connecting member 80, and the frame connecting member 80 and the peripheral wall portion 83 formed similarly to the rear frame connecting portion 56b and the load transmission. And a tubular member 87 is fixed to the upper surface portion 83a while a bolt insertion hole 83d is formed on the outer side in the vehicle width direction of the frame connecting member 80.

In the front frame connecting portion 56a, the frame connecting member 80 includes the front load absorbing portion 54a and the front frame portion such that the closed cross-section portion 84a of the load transmitting portion 84 matches the closed cross-sectional portion of the front load absorbing portion 54a in the vehicle front-rear direction. 55, and is joined and connected to the front load absorbing portion 54a and the front frame portion 55.

Also in the frame connecting member 80 of the front frame connecting portion 56a, the bolt inserting hole 2b provided in the lower surface portion 2a of the rear side frame 2 is made to correspond to the bolt inserting hole 83d provided in the upper surface portion 83a of the frame connecting member 80. The bolt B2 is connected to the rear side frame 2 by being screwed into a nut welded to the vehicle body upper side of the lower surface portion 2a of the rear side frame 2 in a state where the bolt B2 is arranged on the vehicle body lower side of the frame 2.

The left and right frame connecting members 80 that form the front frame connecting portion 56a are connected by a sub-cross member 90 that has a closed cross section and extends in the vehicle width direction. The outer side in the vehicle width direction of the sub cross member 90 is joined to the peripheral wall portions 83 of the left and right frame connecting members 80 to form the upper cross portion 53. The sub-cross member 90 is also provided with an inclined surface 90a that inclines toward the vehicle body lower side toward the vehicle body front side at the vehicle width direction center side, and a guide panel described later is attached to the inclined surface 90a.

FIG. 12 is a perspective view showing a branch frame member of the sub-frame unit. As shown in FIG. 12, the branch frame member 61 is disposed on the rear side of the vehicle body and extends toward the vehicle body front side so as to incline toward the vehicle body lower side, and the vehicle body front side disposed on the vehicle body lower side. A front surface portion 63 extending in a substantially vertical direction, a bottom surface portion 64 arranged on the lower side of the vehicle body and extending in a substantially horizontal direction in the vehicle body front-rear direction, a rear surface portion 62, a front surface portion 63 and a bottom surface portion 64 inward in the vehicle width direction and It is provided with side portions 65 on both sides, which are connected to each other at the outer ends and are spaced apart in the vehicle width direction in a direction substantially orthogonal to the vehicle width direction.

The side surface portion 65 of the branch frame member 61 is formed in a substantially right-angled trapezoidal shape in which the vehicle body upper side is longer in the vehicle body front-rear direction than the vehicle body lower side, and the side surface portion 65 is formed with a substantially inverted triangular opening 65a. The branch frame member 61 is joined to the upper frame member 51 by being joined to the upper frame member 51 by flange portions 66 provided on both side surfaces 65 and extending toward the vehicle body upper side.

13 is a perspective view showing a frame connecting portion connecting the rear subframe and the battery frame, FIG. 14 is another perspective view showing a frame connecting portion connecting the rear subframe and the battery frame, and FIG. It is a perspective view showing a lower frame member of a sub-frame unit.

As shown in FIGS. 13 to 15, at the frame connecting portion 70 that connects the rear subframe 50 and the battery frame 30, the lower frame member 71 of the rear subframe 50 and the battery frame 30 are connected. The lower frame member 71 includes an upper frame 72 having a substantially U-shaped cross section which constitutes an upper side of the vehicle body of the lower frame member 71 and a lower frame 73 having a substantially U-shaped cross section which constitutes a lower side of the vehicle body of the lower frame member 71. Is joined to form a closed cross-section portion 74 formed in a closed cross-section in an orthogonal cross section orthogonal to the vehicle front-rear direction.

The lower frame member 71 is provided linearly in the vehicle width direction inside in the vehicle front-rear direction, and extends obliquely outward in the vehicle width direction as the vehicle width direction outer side extends toward the vehicle body front side. It is formed in a substantially right-angled triangle shape in which the width in the vehicle width direction is larger on the front side of the vehicle than on the rear side of the vehicle.

As shown in FIG. 15, in the lower frame member 71, a ridge line extending in the vehicle front-rear direction is formed on the upper surface 71a at the vehicle width direction center side on the vehicle body front side, and on the inner side of the closed cross-section portion 74 in the vehicle body front-rear direction. A first concave portion 75 that is recessed in a substantially truncated pyramid shape is formed, and a ridge line that extends in the vehicle front-rear direction is formed on the lower surface portion 71b at the vehicle width direction center side on the vehicle body front side and on the inner side of the closed cross section portion 74 in the vehicle body front-rear direction. A second concave portion 76 that is recessed into a substantially quadrangular prism shape is formed in the.

The lower frame member 71 also has a lower frame 73 extending forward and rearward of the vehicle body with respect to the upper frame 72, and a front extension portion 73a extending forwardly and rearwardly of the vehicle from the upper frame 72 to the lower frame 73. A rear extension 73b is provided.

In the frame connecting portion 70, the lower frame member 71 is arranged such that the vehicle body front side of the closed cross-section portion 74 faces the battery frame 30 and the front extending portion 73a is superposed on the bottom surface portion 30c of the battery frame 30. In this state, the bolt B3 is screwed into a nut (not shown) fixed to the upper surface side of the bottom surface portion 30c of the battery frame 30 to be connected to the battery frame 30. A lower frame of the rear frame 31 extends on the vehicle body rear side of the side frame 32 of the battery frame 30 so as to cover the side frame 32.

As shown in FIGS. 1 and 13, the side frame 32 of the battery frame 30 is offset in the vehicle front-rear direction from the rear sub-frame 50 in the vehicle front-rear direction center side and in the vehicle width-direction outer side from the rear sub-frame 50. Specifically, the center line C2 of the side frame 32 is offset outward from the center line C1 of the rear sub-frame 50 in the vehicle width direction and extends in the vehicle body front-rear direction.

The lower frame member 71 extends toward the vehicle body front side while inclining outward in the vehicle width direction, and is offset to the vehicle width direction outward side from the rear subframe 50 and extends to the side frame 32 extending in the vehicle body front-rear direction. An inclined portion 77 facing each other and a rear portion that is widened inward in the vehicle width direction to a position that extends linearly in the vehicle front-rear direction from the inclined portion 77 and extends inward in the vehicle width direction from the rear end of the side frame 32. The widened portion 78 facing the frame 31 is provided.

The inclined portion 77 of the lower frame member 71 is formed by the outer side portion of the lower frame member 71 in the vehicle width direction, and the widened portion 78 is the inner side in the vehicle width direction of the lower frame member 71 on the vehicle body front side. It is formed by the part of. On the vehicle rear side of the lower frame member 71, the upper frame member 51 and the branch frame member 61 are formed to have substantially the same width in the vehicle width direction.

The lower frame member 71 is also arranged such that the vehicle body rear side of the closed cross section 74 faces the front surface portion 63 of the branch frame member 61, and the rear extension portion 73b is superposed on the bottom surface portion 64 of the branch frame member 61. In this state, the bolt B4 is screwed into a nut (not shown) fixed to the upper surface side of the bottom surface portion 64 of the branch frame member 61 to be connected to the branch frame member 61.

16 is a cross-sectional view of the rear sub-frame unit taken along line Y16-Y16 in FIG. As shown in FIG. 16, the rear subframe 50 extends rearward of the vehicle body from the range extender device 40 and forward of the vehicle body from the silencer 44 and the catalyst device 45, and extends downward toward the vehicle body toward the vehicle front side. A guide portion 91 including a guide panel that guides the silencer 44 when a collision load is applied from the rear of the vehicle body is provided.

The guide portion 91 includes a vertical wall portion 92 that extends so as to incline toward the vehicle body lower side toward the vehicle body front side, and extends toward the vehicle body lower side from the range extender device 40 so as to cover the range extender apparatus 40 from the vehicle body rear side. .. The guide portion 91 is also provided on the vertical wall portion 92 with a plurality of, specifically three recesses 92a that extend in the vehicle up-down direction and are recessed toward the vehicle body front side and are spaced apart in the vehicle width direction. A plurality of ridge lines extending to the.

As shown in FIG. 8, mounting brackets 93 having a substantially hat-shaped cross section are mounted on both sides of the guide portion 91 in the vehicle width direction on the vehicle body front side so as to cover the vehicle body front side of the recess 92a. As shown, the mounting bracket 93 is mounted on the inclined surface 90 a of the sub-cross member 90 using bolts and nuts, and the guide portion 91 is joined to the upper cross portion 53. The guide portion 91 extends rearward of the vehicle body from the upper cross portion 53, and a portion 91 a extending rearward of the vehicle body from the upper cross portion 53 is supported by the upper cross portion 53 in a cantilevered state.

The guide portion 91 also includes a bottom surface portion 94 that extends from the vehicle body lower side of the vertical wall portion 92 to the vehicle body front side, and the flange portions 94 a provided on both sides of the bottom surface portion 94 in the vehicle width direction include the bottom surface portion 64 of the branch frame member 61. To the rear extension portion 73b of the lower frame member 71 by using bolts and nuts, and flange portions 92b provided on both sides in the vehicle width direction on the vehicle body lower side of the vertical wall portion 92 are rear surface portions of the branch frame member 61. It is connected to 62 using a bolt and a nut.

The guide portion 91 is connected to the front end portion of the load absorbing portion 54 provided in the upper frame member 51 via the upper cross portion 53, and extends downward from the bottom surface portion 64 of the branch frame member 61 and the lower frame member 71. It is connected to the installation portion 73b. It is also possible to use the bottom surface portion 94 of the guide portion 91 as a jack contact portion for contacting the garage jack during maintenance work, for example.

FIG. 17 is an explanatory diagram for explaining the attachment of the auxiliary equipment to the rear subframe, and shows the portion related to the attachment of the auxiliary equipment. In addition, in the drawings excluding FIG. 17 to FIG. 19, the attachment structure of the auxiliary equipment to the rear subframe is omitted. As shown in FIG. 17, the range extender device 40 is attached to the upper frame member 51 of the rear sub-frame 50 via the elastic members by the left and right side support parts 40a provided on both sides in the vehicle width direction, and at the same time, the rear part of the vehicle body. It is attached to the sub-cross member 90 via an elastic member by a rear support portion 40b provided on the side.

The silencer 44 and the catalyst device 45 are attached to the rear sub-frame 50 by a front support hanger 100 that supports the silencer 44, and a rear support hanger 110 that is disposed on the vehicle body rear side of the front support hanger 100 and supports the silencer 44. ing.

The front support hanger 100 is provided on both sides of the exhaust pipe 43 upstream of the silencer 44 in the vehicle width direction. The front support hanger 100 is fixed to the exhaust pipe 43 in which the silencer 44 is arranged, and the tip end portion thereof extends in the vehicle width direction. The subframe side rod 102 fixed to the frame coupling member 80 of the rear frame coupling part 56b of the rear subframe 50 and having its tip end extending in the vehicle width direction, the silencer side rod 101 and the subframe side rod 102 are inserted. And a rubber member 103 as an elastic body.

The rubber member 103 is formed of an elastic material such as rubber into a substantially elliptical plate shape. The rubber member 103 is provided with insertion holes 103a and 103b extending in the axial direction of the rubber member 103 and through which the silencer side rod 101 and the subframe side rod 102 are inserted. The rubber member 103 of the front support hanger 100 is provided with two insertion holes 103a and 103b that are spaced apart in the vehicle front-rear direction and extend in the vehicle width direction.

The silencer-side rod 101 is provided with a silencer-side insertion portion 101a at its tip end that extends in the vehicle width direction and is inserted into the insertion hole 103a of the rubber member 103. The sub-frame side rod 102 is provided with a sub-frame side insertion portion 102a that extends in the vehicle width direction at the tip and is inserted into the insertion hole 103b of the rubber member 103.

In the front-side support hanger 100, the silencer-side insertion portion 101 a of the silencer-side rod 101 and the sub-frame side insertion portion 102 a of the sub-frame side rod 102 are respectively inserted into the insertion holes 103 a and 103 b of the rubber member 103, and the elastic body 103 is interposed. The silencer 44 is supported by the rear subframe 50.

FIG. 18 is an explanatory diagram for explaining a rear side support hanger that supports the silencer, and schematically shows a portion related to the rear side support hanger. As shown in FIGS. 17 and 18, the rear side support hangers 110 are provided on the vehicle body rear side of the silencer 44 on both sides in the vehicle width direction, and are fixed to the silencer 44, and a tip end portion thereof extends on the silencer side rod 111. And a sub-frame side rod 112 fixed to the sub-frame side bumper rain 18 of the rear sub-frame 50 and having a front end extending in the vehicle front-rear direction, and an elastic body through which the silencer side rod 111 and the sub-frame side rod 112 are inserted. And a rubber member 113.

The rubber member 113 is formed of an elastic material such as rubber into a substantially elliptical plate shape. The rubber member 113 is provided with insertion holes 113a and 113b extending in the axial direction of the rubber member 113 and through which the silencer side rod 111 and the subframe side rod 112 are inserted. The rubber member 113 of the rear support hanger 110 is provided with two insertion holes 113a and 113b that are spaced apart in the vehicle body vertical direction and the vehicle width direction and extend in the vehicle body front-rear direction.

The silencer-side rod 111 is provided with a silencer-side insertion portion 111a that extends in the front-rear direction of the vehicle body and is inserted into the insertion hole 113a of the rubber member 113 at the tip end, and the vehicle body front side that is the silencer side of the silencer-side insertion portion 111a is An elastic body movement restricting portion 111b that restricts the rubber member 113 from moving forward of the silencer side insertion portion 111a to the vehicle body side is provided on the vehicle body front side of the silencer side insertion portion 111a.

The sub-frame side rod 112 is provided with a sub-frame side insertion portion 112a that extends in the front-rear direction of the vehicle body and is inserted into the insertion hole 113b of the rubber member 113 at the tip portion, and the rear sub-frame side of the sub-frame side insertion portion 112a. The sub-frame side insertion permitting portion 112b is provided which allows the rear side of the vehicle body to extend straight in the longitudinal direction of the vehicle body for a predetermined distance and be inserted into the insertion hole 113b of the rubber member 113.

The subframe side rod 112 is bent at the vehicle body rear side, which is the rear subframe side of the subframe side insertion permitting portion 112b, to bend to the vehicle body rear side of the subframe side insertion permitting portion 112b. An elastic body insertion restricting portion 112c is provided that restricts insertion of the vehicle body rear side from the portion 112b.

In the rear support hanger 110, the silencer-side insertion portion 111 a of the silencer-side rod 111 and the sub-frame side insertion portion 112 a of the sub-frame side rod 112 are inserted into the insertion holes 113 a and 113 b of the rubber member 113, respectively, and the elastic body 113 is The silencer 44 is supported by the rear sub-frame 50 via the silencer 44.

FIG. 19 is an explanatory diagram for explaining the movement of the silencer at the time of a rear impact. As shown in FIG. 19A, when a collision load acts from the rear of the vehicle body at the time of a rear collision of the vehicle body 1, the rear portion of the vehicle body is deformed and the collision load is input to the rear side frame 2 and also to the rear subframe 50. Collision load is input.

When a collision load is input to the rear sub-frame 50, the sub-frame side bumper rain 18 of the rear sub-frame 50 is moved to the front side of the vehicle body and the rear side of the rear sub-frame 50 is moved as shown in FIG. 19B. The load absorbing portion 54b buckles and deforms in the vehicle front-rear direction to absorb the collision load.

When the sub-frame side bumper rain 18 of the rear sub-frame 50 is moved to the front side of the vehicle body, the sub-frame side insertion permitting portion 112b provided on the sub-frame side rod 112 of the rear support hanger 110 moves to the front side of the vehicle body. The rear load absorbing portion 54b of the rear sub-frame 50 absorbs the collision load without being moved through the insertion hole 113b of the rubber member 113 and without moving the silencer side rod 111 of the rear support hanger 110.

As shown in FIG. 19C, when the sub-frame side bumper rain 18 of the rear sub-frame 50 is further moved to the vehicle body front side, the front load absorbing portion 54a of the rear sub-frame 50 is buckled and deformed in the vehicle body front-rear direction. While absorbing the collision load, the silencer 44 and the catalyst device 45 are moved to the front side of the vehicle body, but the silencer 44 and the catalyst device 45 are moved to the lower side of the vehicle body along the guide portion 91 toward the front side of the vehicle body. R.

When the sub-frame side bumper rain 18 is further moved to the front side of the vehicle body, the sub-frame side rod 112 is inserted into the rubber member 113 by the elastic body insertion restricting portion 112c provided on the sub-frame side rod 112 of the rear support hanger 110. The rubber member 113 is restricted from moving to the front side of the vehicle body by the elastic body movement restricting portion 111b provided on the silencer side rod 111 of the rear support hanger 110, and the silencer 44 and the catalyst device 45 are controlled. Moves toward the vehicle body lower side along the guide portion 91 toward the vehicle body front side, and the silencer side rod 111 of the rear side support hanger 110 is separated from the rubber member 113.

In the vehicle body 1 configured as described above, when a collision load is applied from the rear of the vehicle body at the time of a rear collision, when the collision load is input to the rear side frame 2, the collision load is applied by the load absorbing portion 6 provided on the rear side frame 2. Is absorbed and the load input to the rear side frame 2 is transmitted to the front side of the rear side frame 2 and is dispersed.

Further, after the load absorbing portion 6 provided on the rear side frame 2 starts to buckle and deform, a collision load is also input to the rear subframe 50, and the load absorbing portion 54 provided on the rear subframe 50 buckles and collides. Absorb load. In the rear subframe 50, the front load absorbing portion 54a is buckled and deformed after the rear load absorbing portion 54b is buckled to absorb the collision load.

The load input to the rear sub-frame 50 is transmitted from the upper frame member 51 of the rear sub-frame 50 to the front side of the vehicle body and is transmitted to the rear side frame 2 connected to the front side of the rear sub-frame 50 to the vehicle front side. And from the upper frame member 51 of the rear sub-frame 50 to the rear surface portion 62 of the branch frame member 61 and the side surface portions 65 on both sides near the rear surface portion 62 and the bottom surface portion 64 of the branch frame member 61 of the rear sub-frame 50. It is transmitted to the side surface portions 65 on both sides in the vicinity of the bottom surface portion 64, is transmitted to the lower frame member 71, and is transmitted from the lower frame member 71 to the battery frame 30.

The load input to the rear sub-frame 50 is also transmitted to the rear surface portion 62 of the branch frame member 61 and the side surface portions 65 on both sides in the vicinity of the rear surface portion 62 through the upper cross portion 53 and the guide portion 91 to the lower frame member 71. It is transmitted to the battery frame 30 from the lower frame member 71.

When a collision load acts on the guide portion 91 from the rear of the vehicle body during a rear collision, the collision load input to the guide portion 91 is applied to the rear surface portion 62 of the branch frame member 61 and the side surface portions 65 on both sides near the rear surface portion 62. It is transmitted to the lower frame member 71, is transmitted from the lower frame member 71 to the battery frame 30, and is transmitted from the upper cross portion 53 to the upper frame member 51 of the rear subframe 50. It is transmitted to each part.

In the vehicle body 1 according to the present embodiment, the rear sub-frame 50 includes an upper branch frame portion 121 extending from the vehicle body front side to the vehicle body front side and the vehicle body upper side and the vehicle body front side and the vehicle body lower side, as shown in FIGS. 2 and 9. The vehicle body front side of the upper side branch frame portion 121 is connected to the vehicle body upper side frame member 2 arranged on the vehicle body upper side of the vehicle interior floor portion 10, and the lower side branch frame portion 122 extends downward. The vehicle body front side of the frame portion 122 is connected to the vehicle body lower frame member 30 arranged below the vehicle body floor portion 10 with respect to the vehicle body.

The upper branch frame portion 121 is constituted by the front frame portion 55 of the rear subframe 50, and the lower branch frame portion 122 is provided on the rear surface portion 62 of the branch frame member 61 of the rear subframe 50 and both side surfaces near the rear surface portion 62. The vehicle body upper frame member 2 is configured by the rear side frame 2, and the vehicle body lower frame member 30 is configured by the battery frame 30.

As described above, in the rear vehicle body structure of the vehicle according to the present embodiment, the rear sub-frame 50 disposed below the rear side frame 2 includes the upper branch frame portion 121 whose front side extends toward the front side and the upper side of the vehicle. A vehicle body upper frame member 2 that is provided by branching to a lower branch frame portion 122 that extends to the vehicle body front side and vehicle body lower side, and the vehicle body front side of the upper branch frame portion 121 is arranged above the vehicle body floor portion 10 above the vehicle body. The vehicle body front side of the lower branch frame portion 122 is coupled to the vehicle body lower frame member 30 disposed below the vehicle compartment floor portion 10 with respect to the vehicle body.

Thus, when a collision load is applied to the rear end portion of the rear sub-frame 50 from the rear of the vehicle body at the time of a rear collision, the load input to the rear sub-frame 50 is applied to the upper branch frame portion extending to the vehicle body front side and the vehicle body upper side. It is possible to transmit to the vehicle body upper frame member 2 through 121 and to the vehicle body lower frame member 30 through the lower branch frame portion 122 extending to the vehicle body front side and vehicle body lower side. Therefore, the load input to the rear subframe 50 can be dispersed to the vehicle body front side and the vehicle body upper side and the vehicle body lower side to suppress the deformation of the rear subframe 50, and the rear end of the rear subframe 50 at the rear portion of the vehicle body. When the auxiliary machines 40, 44, 45 are arranged on the front side of the vehicle body with respect to the vehicle body, the auxiliary machines 40, 44, 45 arranged on the rear side of the vehicle body can be protected and the safety of passengers in the vehicle compartment can be improved.

The vehicle body upper side frame member 2 is the rear side frame 2 disposed on the rear floor portion 3 extending from the kick-up portion 13 to the vehicle rear side, and the vehicle body lower side frame member 30 is on the vehicle body lower side than the kick-up portion 13. Is a vehicle body lower frame member 30 that is arranged in the vehicle interior floor portion 10 and is connected to the vehicle compartment floor portion 10. As a result, the load input to the rear sub-frame 50 at the time of a rear collision is transmitted from the vehicle body upper frame member 2 to each vehicle body upper portion to be dispersed and is also transmitted from the vehicle body lower frame member 30 to each vehicle body lower portion. Can be dispersed.

The vehicle body lower frame member 30 is the battery frame 30 that supports the battery 20 arranged below the vehicle interior floor portion 10. As a result, the load input to the rear sub-frame 50 at the time of a rear-end collision can be transmitted to the battery frame 30 to be dispersed and can be dispersed in a wide range.

Further, the lower branch frame portion 122 of the rear sub-frame 50 is provided so as to extend in a substantially horizontal direction below the vehicle body of the torsion beam 17 that connects the pair of left and right trailing arms and extends in the vehicle width direction. As a result, it is possible to improve the support rigidity of the torsion beam type suspension device and the bending rigidity of the lower branch frame part 122 while ensuring the movable range of the torsion beam 17.

In the present embodiment, the silencer 44 and the catalyst device 45 are provided as exhaust system components in a vehicle such as an electric vehicle in which the range extender device 40 is provided in the rear portion of the vehicle body, but only the silencer 44 is provided. Is also possible.

Further, although the present embodiment describes a vehicle such as an electric vehicle in which the range extender device 40 is disposed in the rear portion of the vehicle body, in other vehicles such as an electric vehicle, the fuel which is an important safety component in the rear portion of the vehicle body is also described. The same can be applied to a vehicle provided with auxiliary equipment such as a tank and a power storage device.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the gist of the present invention.

As described above, according to the present invention, in a vehicle including a rear sub-frame disposed below a rear side frame, an auxiliary machine disposed at a rear part of a vehicle body is protected at the time of a rear-end collision, and safety of passengers in the vehicle compartment is improved. Since it is possible to improve the property, it may be suitably used in the field of manufacturing industry of this type of vehicle.

1 Vehicle Body 2 Rear Side Frame 3 Rear Floor Part 10 Vehicle Interior Floor Part 13 Kick Up Part 17 Torsion Beam 20 Battery 30 Battery Frame 40 Range Extender Device 41 Generator 42 Engine 50 Rear Subframe 51 Upper Frame Member 60 Subframe Unit 61 Branch Frame Member 71 Lower Frame Member 80 Frame Connecting Member 121 Upper Branch Frame Part 122 Lower Branch Frame Part

Claims (4)

A rear vehicle body structure of a vehicle, comprising a rear side frame extending in a vehicle body front-rear direction at a vehicle body rear portion, and a rear subframe disposed below the rear side frame and extending in a vehicle body front-rear direction,
The rear subframe is provided such that the vehicle body front side of the rear subframe is branched into an upper branch frame portion extending toward the vehicle body front side and the vehicle body upper side, and a lower side branch frame portion extending toward the vehicle body front side and the vehicle body lower side,
The vehicle body front side of the upper branch frame portion is connected to a vehicle body upper frame member arranged on the vehicle body upper side from a vehicle compartment floor portion forming a floor surface of a vehicle compartment,
A vehicle body front side of the lower branch frame portion is connected to a vehicle body lower frame member arranged below the vehicle compartment floor portion with respect to the vehicle body,
The rear body structure of the vehicle, which is characterized in that A kick-up portion extending from a rear end portion of the vehicle compartment floor portion to an upper side of the vehicle body; and a rear floor portion extending from the kick-up portion to a vehicle body rear side and provided with the rear side frame,
The vehicle body upper frame member is the rear side frame disposed on the rear floor portion extending from the kick-up portion to the vehicle rear side,
The vehicle body lower frame member is a vehicle body lower frame member that is disposed on a vehicle body lower side of the kick-up portion and is connected to the vehicle compartment floor portion,
The rear body structure for a vehicle according to claim 1, wherein: The vehicle body lower frame member is a battery frame that supports a battery arranged below the vehicle compartment floor portion,
The rear body structure of the vehicle according to claim 1 or 2, characterized in that. The lower branch frame portion of the rear subframe is provided so as to extend in a substantially horizontal direction below a vehicle body of a torsion beam extending in the vehicle width direction by connecting a pair of left and right trailing arms extending in the vehicle front-rear direction,
The rear body structure of the vehicle according to any one of claims 1 to 3, wherein:

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