JP6489249B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure.

  In the rear structure of the vehicle body described in Patent Document 1 below, a floor frame having a longitudinal direction in the longitudinal direction of the vehicle body is provided at the lower part of the front floor, and a center frame having a longitudinal direction in the longitudinal direction of the vehicle body is provided at the bottom of the spare tire pan. Is provided. And the rear-end part of a floor frame and the front-end part of a center frame are connected with the assembly | attachment type reinforcement bar. Thereby, a collision load (hereinafter referred to as “rear collision load”) at the time of a rear collision is transmitted to the front side of the vehicle body.

JP 2010-241176 A

  However, in the rear structure of the vehicle body configured as described above, the cross-sectional shape of the bottom portion of the spare tire pan (rear floor pan) viewed from the vehicle body width direction is bent downward and is centered along the cross-sectional shape of the bottom portion. Is bent. For this reason, when the center frame bends (buckles) due to the rear impact load, the load transmission efficiency to the front side of the vehicle body decreases.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to obtain a vehicle body rear structure that can efficiently transmit a rear impact load to the vehicle body front side.

  The vehicle body rear structure according to the first aspect of the present invention includes a left and right rear side member disposed on both sides of the rear floor pan in the vehicle width direction as a longitudinal direction of the vehicle body, and vehicle bodies at the rear end portions of the left and right rear side members. Rear bumper reinforcement disposed on the rear side with the vehicle body width direction as a longitudinal direction, a rear suspension member attached to the front part of the left and right rear side members, and a load receiving part protruding upward from the rear suspension member A vehicle body longitudinal direction is disposed in the vehicle body width direction inside the rear part of the left and right rear side members and on the vehicle body rear side of the rear suspension member, and at least a part of each rear end part is a vehicle body with respect to the rear bumper reinforcement. The left and right reinforcement members overlapped in the front-rear direction and the left and right rear side members A rear cross member that is connected between the left and right reinforcing members and the load receiving portion, and partially overlaps the load receiving portion in the vehicle longitudinal direction. I have.

  According to a second aspect of the present invention, the rear structure of the vehicle body according to the first aspect is such that the load receiving portion is located above the left and right side portions of the rear suspension member attached to the front portions of the left and right rear side members. Protruding.

  According to a third aspect of the present invention, in the rear structure of the vehicle body according to the first or second aspect, the load receiving portion overlaps at least a part of the front end portions of the left and right reinforcing members when viewed in the vehicle longitudinal direction. Yes.

  According to a fourth aspect of the present invention, in the vehicle body rear part structure according to any one of the first to third aspects, the left and right reinforcing members are disposed on the vehicle body upper side of the rear floor pan.

  According to a fifth aspect of the present invention, in the vehicle body rear portion structure according to any one of the first to fourth aspects, the left and right reinforcing members have a reinforcing member main body having a closed cross section extending in the vehicle longitudinal direction. .

  With the vehicle body rear structure according to the present invention, the rear impact load can be efficiently transmitted to the vehicle body front side.

It is a perspective view showing the composition of the principal part of the vehicle body rear part structure concerning a 1st embodiment of the present invention in the state seen from the vehicle body back slanting left upper side. It is a top view which shows the structure of the principal part of the vehicle body rear part structure which concerns on 1st Embodiment. It is a bottom view which shows the structure of the principal part of the vehicle body rear part structure which concerns on 1st Embodiment. It is sectional drawing which expands and shows the cut surface along the F4-F4 line | wire of FIG. FIG. 3 is a schematic cross-sectional view showing an enlarged cut surface along the line F5-F5 in FIG. 2. FIG. 3 is a schematic cross-sectional view showing an enlarged cut surface along the line F6-F6 in FIG. 2. It is a typical longitudinal cross-sectional view for demonstrating transmission of the rear-end collision load from a reinforcement member to a rear suspension member in the vehicle body rear part structure which concerns on 1st Embodiment. FIG. 3 is a schematic plan view for explaining transmission of a rear-end collision load from a reinforcing member to a rear suspension member in the vehicle body rear structure according to the first embodiment. It is sectional drawing corresponding to FIG. 5 which shows the periphery structure of the reinforcement member which concerns on the 1st modification of 1st Embodiment. It is sectional drawing corresponding to FIG. 5 which shows the periphery structure of the reinforcement member which concerns on the 2nd modification of 1st Embodiment. FIG. 10 is a schematic cross-sectional view showing a peripheral configuration of a reinforcing member according to a third modification of the first embodiment as viewed from the left side of the vehicle body. FIG. 9 is a schematic cross-sectional view showing a peripheral configuration of a reinforcing member according to a fourth modification of the first embodiment as viewed from the left side of the vehicle body. FIG. 10 is a schematic cross-sectional view showing a peripheral configuration of a reinforcing member according to a fifth modification of the first embodiment as viewed from the left side of the vehicle body. It is a perspective view which shows the structure of the principal part of the vehicle body rear part structure which concerns on 2nd Embodiment of this invention in the state seen from the vehicle body back diagonally left upper side. It is a top view which shows the structure of the principal part of the vehicle body rear part structure which concerns on 2nd Embodiment. It is a bottom view which shows the structure of the principal part of the vehicle body rear part structure which concerns on 2nd Embodiment. It is sectional drawing which expands and shows the cut surface along the F17-F17 line | wire of FIG. It is a perspective view which shows the structure of the load receiving part with which the rear suspension member of the vehicle body rear part structure which concerns on 2nd Embodiment is provided. It is the schematic which shows the state which looked at the reinforcement member and the load receiving part from the vehicle body front side. It is a perspective view which shows the structure of the bulk member of the vehicle body rear part structure which concerns on 2nd Embodiment. It is a disassembled perspective view of the same bulk member. FIG. 10 is a perspective view showing a state in which a peripheral configuration of a reinforcing member on the right side of the vehicle body is enlarged and a main body portion of the reinforcing member is seen through in a vehicle body rear structure according to the second embodiment. It is the perspective view which abbreviate | omitted illustration of the reinforcement member in the structure shown by FIG. It is the rear view which looked at the vehicle body right side part in the vehicle body rear part structure which concerns on 2nd Embodiment from the vehicle body back side. It is the rear view which looked at the reinforcement member which concerns on 2nd Embodiment from the vehicle body back. In the vehicle body rear part structure according to the second embodiment, the rear bumper reinforcement is a cross-sectional view as seen from the left side of the vehicle body when the barrier collides rearward. It is sectional drawing corresponding to FIG. 22A which shows the state by which the fastener which fastened the rear bumper reinforcement and the lower back was inserted in the through-hole formed in the reinforcement member. It is sectional drawing corresponding to a part of FIG. 17 which shows the vehicle body rear part structure which concerns on a comparative example. FIG. 23B is a cross-sectional view corresponding to FIG. 23A showing a state in which the reinforcing member is lifted upward by the rear impact load in the vehicle body rear structure according to the comparative example. It is sectional drawing corresponding to a part of FIG. 17 which shows the periphery structure of the reinforcement member which concerns on the 1st modification of 2nd Embodiment. FIG. 10 is a schematic cross-sectional view showing a peripheral configuration of a reinforcing member according to a second modification of the second embodiment as viewed from the left side of the vehicle body. FIG. 10 is a schematic bottom view showing a peripheral configuration of a reinforcing member according to a second modification of the second embodiment as seen from the vehicle body lower side. It is a perspective view which shows the partial structure of the left half part of the vehicle body rear part structure which concerns on 3rd Embodiment of this invention in the state seen from the vehicle body left diagonally back upper side. It is a disassembled perspective view of the reinforcement member which concerns on 3rd Embodiment.

<First Embodiment>
A vehicle body rear structure 10 according to a first embodiment of the present invention will be described with reference to FIGS. This first embodiment is a reference example. Note that arrows FR, UP, and LH, which are appropriately shown in the drawings, respectively indicate the forward direction of the vehicle body (the traveling direction of the vehicle), the upward direction, and the left direction (one of the vehicle body width directions). Hereinafter, when simply using the front-rear, left-right, and up-down directions, unless otherwise specified, the front-rear direction of the vehicle body, the left-right direction of the vehicle body direction (vehicle width direction), and the up-down direction of the vehicle body To do.

(Constitution)
As shown in FIGS. 1 to 4, the vehicle body rear structure 10 according to the first embodiment of the present invention includes a rear floor pan 12, a pair of left and right rear side members 14, a lower back 16 (not shown except in FIG. 4), A rear bumper reinforcement 18, a rear cross member 20, a rear suspension member 22, a pair of left and right reinforcing members 24, and a pair of left and right front brackets 26 are provided. In addition, since this vehicle body rear part structure 10 is comprised left-right symmetrically, in the following description, only the structure of either right or left is demonstrated and description of either right or left may be abbreviate | omitted. Moreover, in each figure, the same sign is attached | subjected to the member made into the left-right pair. Moreover, in each figure, some codes | symbols may be abbreviate | omitted. Hereafter, each said component is demonstrated.

(Rear floor pan 12)
The rear floor pan 12 is also referred to as a rear floor panel, and constitutes a floor surface at the rear of the vehicle body. As shown in FIGS. 2 and 3, the rear floor pan 12 includes a rear floor pan front portion 12A positioned between the left and right rear tires 28 when viewed from the vehicle vertical direction, and a rear side of the rear floor pan front portion 12A. The rear floor pan rear portion 12C is positioned, and the rear floor pan intermediate portion 12B (see FIG. 4) is positioned between the rear floor pan front portion 12A and the rear floor pan rear portion 12C. The rear floor pan rear portion 12C constitutes the floor surface of the luggage space.

  The rear floor pan front portion 12A and the rear floor pan rear portion 12C extend in the vehicle longitudinal direction and the vehicle width direction. The rear floor pan rear portion 12C is located on the vehicle body lower side than the rear floor pan front portion 12A, and is formed wider in the vehicle body width direction than the rear floor pan front portion 12A. A recess 30 that opens to the upper side of the vehicle body is formed on the front side of the rear floor pan rear portion 12C and in the vehicle width direction center side. The recess 30 is inclined upward toward the vehicle rear side on the vehicle body rear side. The inclined portion 32 is formed.

  As shown in FIG. 4, the rear floor pan intermediate portion 12B has a substantially L-shaped cross section viewed from the left side of the vehicle body, and the rear floor pan front portion 12A and the rear floor are interposed via the rear floor pan intermediate portion 12B. The pan rear part 12C is connected.

(Rear side member 14)
The left and right rear side members 14 are frame members that are disposed on both sides of the rear floor pan 12 in the vehicle body width direction with the vehicle body longitudinal direction as the longitudinal direction. These rear side members 14 include a rear side member front portion 14A located between the left and right rear tires 28 when viewed from the vehicle vertical direction, and a rear side member rear portion 14B extending from the rear end portion of the rear side member front portion 14A to the vehicle body rear side. have. The front end portion of the rear side member front portion 14A is joined (welded: the same applies hereinafter) to a rear end portion of a rocker (not shown).

  The rear side member rear portion 14B is disposed on the vehicle body upper side with respect to both sides of the rear floor pan rear portion 12C in the vehicle width direction. As schematically shown in FIG. 5, the rear side member rear portion 14B is formed in a hat shape having a cross-sectional shape viewed from the front-rear direction of the vehicle body and opened to the vehicle body lower side, and left and right flanges 34 provided on the opening side. , 36 are joined to the upper surface of the rear floor pan rear portion 12C by spot welding.

  The rear side member front portion 14A is disposed on the outer side in the vehicle width direction with respect to the rear floor pan front portion 12A and the rear floor pan middle portion 12B. The rear side member front part 14A is formed in a cross-sectional hat shape that opens to the outer side in the vehicle width direction when viewed from the front-rear direction of the vehicle body, and the wall part opposite to the opening is the rear floor pan front part 12A and the rear floor pan intermediate part 12B. Are joined to the end in the vehicle body width direction by spot welding. A rear wheel house (not shown) is coupled to the outer side of the rear side member front portion 14A in the vehicle width direction.

(Lower back 16)
The lower back 16 (not shown except for FIG. 4) is disposed on the vehicle body rear side of the rear floor pan 12 and the left and right rear side members 14, and extends in the vehicle body width direction and the vehicle body vertical direction. The lower back 16 is coupled to the rear end of the rear floor pan 12 by spot welding.

(Rear bumper reinforcement 18)
The rear bumper reinforcement 18 is disposed at the same height as the left and right rear side members 14 on the vehicle body rear side of the lower back 16. The rear bumper reinforcement 18 is a skeleton member that connects the rear end portions of the left and right rear side members 14 (rear end portions of the left and right rear side member rear portions 14B) in the vehicle body width direction, and the vehicle body width direction is the longitudinal direction. It is formed in a long shape. The rear bumper reinforcement 18 has a substantially B-shaped cross section viewed from the width direction of the vehicle body. The rear bumper reinforcement 18 has a lower back 16 sandwiched between the rear end portions of the left and right rear side member rear portions 14B. It is fixed to the rear end portions of the left and right rear side members 14 by fastening.

(Rear cross member 20)
The rear cross member 20 is a skeleton member that connects the front and rear intermediate portions of the left and right rear side members 14 in the vehicle body width direction, and is formed in a long shape having the vehicle body width direction as a longitudinal direction. The rear cross member 20 includes an upper floor cross member 38 disposed on the vehicle body upper side of the rear floor pan intermediate portion 12B and an under floor cross member 40 disposed on the vehicle body lower side of the rear floor pan intermediate portion 12B.

  The floor cross member 38 has an upper wall portion 38A extending from the rear end portion of the rear floor pan front portion 12A to the vehicle body rear side, and a rear wall portion 38B extending from the rear end of the upper wall portion 38A to the vehicle body lower side. The cross-sectional shape viewed from the left side of the vehicle body is formed in a substantially inverted L shape. The front end portion of the upper wall portion 38A is overlapped with the rear end portion of the rear floor pan front portion 12A and the upper end portion of the rear floor pan intermediate portion 12B, and is joined by spot welding. The lower end portion of the rear wall portion 38B is overlapped with the lower end portion of the rear floor pan intermediate portion 12B and the front end portion of the rear floor pan rear portion 12C, and is joined by spot welding. Thereby, the floor cross member 38 forms a closed cross section extending in the vehicle body width direction between the rear floor pan intermediate portion 12B. Both ends of the on-floor cross member 38 in the vehicle width direction are coupled to the left and right rear side members 14.

  The underfloor cross member 40 is formed in a substantially straight line shape so that a cross-sectional shape viewed from the vehicle body width direction is lowered toward the vehicle rear side, and an upper end portion (front end portion) is formed on a lower surface of the rear floor pan intermediate portion 12B. The lower end portion (rear end portion) is connected to the rear portion of the rear floor pan on the vehicle body front side of the recess 30. Thereby, the floor cross member 38 forms a closed cross section extending in the vehicle body width direction between the rear floor pan intermediate portion 12B.

(Rear suspension member 22)
The rear suspension member 22 is disposed between the left and right rear tires 28. The rear suspension member 22 is attached with a suspension for suspending the left and right rear tires 28, a suspension arm, a stabilizer (both not shown), and the like. The rear suspension member 22 has a pair of left and right side portions (side rail portions) 22A arranged with the longitudinal direction of the vehicle body as a longitudinal direction and a rear member as a cross member portion connecting the rear portions of the left and right side portions 22A in the vehicle body width direction. And a cross member portion 22B.

  The left and right side portions 22A are arranged on the vehicle body lower side of the left and right rear side member front portions 14A with the longitudinal direction of the vehicle body as a longitudinal direction, and the rear end portion 22A1 and the front end portion (not shown) are left and right via a mount cushion (not shown). The rear side member front part 14A is attached by a fastening member. The middle part in the front-rear direction of the left and right side parts 22A is curved so as to protrude toward the center in the vehicle body width direction and above the vehicle body. The left and right side portions 22A are formed by hollow pipes. The rear cross member portion 22B is formed in a long shape with the vehicle body width direction as the longitudinal direction, and is disposed between the middle portions in the front-rear direction of the left and right side portions 22A. 22A.

(Reinforcing member 24)
The left and right reinforcing members 24 are disposed on the inner side in the vehicle width direction of the left and right rear side member rear portions 14B and on the vehicle rear side of the rear suspension member 22 (here, on the vehicle body rear side of the left and right side portions 22A). These reinforcing members 24 are formed in a long shape with the longitudinal direction of the vehicle body as the longitudinal direction, and are disposed close to the left and right rear side member rear portions 14B, and are disposed substantially parallel to the left and right rear side member rear portions 14B. Yes. These reinforcing members 24 include an on-floor reinforcing member 42 coupled to the upper surface of the rear floor pan rear portion 12C and an underfloor reinforcing member 44 coupled to the lower surface of the rear floor pan rear portion 12C. These on-floor reinforcing member 42 and below-floor reinforcing member 44 are formed by press-molding a metal plate such as a steel plate, for example.

  The on-floor reinforcing member 42 is formed in an elongated shape having the longitudinal direction in the longitudinal direction of the vehicle body. As shown schematically in FIGS. 5 and 6, the on-floor reinforcing member 42 is formed in a hat shape in which a cross-sectional shape viewed from the front-rear direction of the vehicle body opens to the vehicle body lower side. Specifically, the on-floor reinforcing member 42 includes an upper wall portion 42A, outer wall portions 42B and inner wall portions 42C that extend from both ends of the upper wall portion 42A in the vehicle width direction, and lower ends of the outer wall portions 42B. The outer flange 42D extends from the lower end of the inner wall portion 42C to the inner side in the vehicle body width direction and the inner flange 42E extends from the lower end of the inner wall portion 42C. The upper wall portion 42A slightly protrudes rearward of the vehicle body from the outer wall portion 42B, the inner wall portion 42C, the outer flange 42D, and the inner flange 42E, and the rear end is disposed in contact with or close to the lower back 16. As shown in FIG. 6, the inner wall portion 42 </ b> C has a front portion that enters the recess 30 of the rear floor pan rear portion 12 </ b> C, and the vertical dimension on the front side is larger than the vertical dimension on the rear side.

  The underfloor reinforcing member 44 is formed in a long shape having the longitudinal direction in the longitudinal direction of the vehicle body. As shown schematically in FIGS. 5 and 6, the underfloor reinforcing member 44 is formed in a hat shape with a cross-sectional shape viewed from the front-rear direction of the vehicle body opened to the upper side of the vehicle body. Specifically, the underfloor reinforcement member 44 includes a lower wall portion 44A, outer wall portions 44B and inner wall portions 44C that extend from both ends of the lower wall portion 44A in the vehicle width direction, and an upper end of the outer wall portion 44B. The outer flange 44D extends from the upper end of the vehicle body width direction to the outer side in the vehicle body width direction, and the inner flange 44E extends from the upper end of the inner wall portion 44C to the vehicle body width direction inner side.

  The floor reinforcement member 42 and the floor reinforcement member 44 are set to have substantially the same length in the longitudinal direction of the vehicle body, and are disposed so as to overlap each other when viewed from the vertical direction of the vehicle body. And the outer flange 42D of the floor reinforcement member 42 and the outer flange 44D of the floor reinforcement member 44 are joined together by spot welding in a state of being overlapped with the rear floor pan rear portion 12C therebetween. Further, the inner flange 42E of the upper floor reinforcement member 42 and the inner flange 44E of the lower floor reinforcement member 44 are joined together by spot welding in a state of three layers with the rear floor pan rear portion 12C interposed therebetween. As a result, a closed cross section extending in the longitudinal direction of the vehicle body is formed by the floor reinforcement member 42 and the floor reinforcement member 44, and between the floor reinforcement member 42 and the rear floor pan rear portion 12C and between the floor reinforcement member 44 and the rear floor pan rear portion 12C. A closed cross section extending in the longitudinal direction of the vehicle body is formed between the two.

  A pair of left and right ridge lines 46 and 48 extending linearly in the longitudinal direction of the vehicle body are formed at the upper end of the floor reinforcing member 42. The ridge line portion 46 on the outer side in the vehicle body width direction is a bent portion formed at the boundary between the upper wall portion 42A and the outer wall portion 42B. The ridge line portion 48 on the inner side in the vehicle body width direction is a bent portion formed at the boundary between the upper wall portion 42A and the inner wall portion 42C. These ridge line portions (bent portions) 46 and 48 are bent at a right angle or a substantially right angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body. In addition, the bending R is set to the ridgeline part 48 so that the area | region enclosed with the dashed-dotted line in FIG. 5 may be expanded and shown. That is, the ridge 48 is bent in an arc shape when viewed from the front and rear direction of the vehicle body. This also applies to the ridge line portion 46 and ridge line portions 50, 52, 54, and 56 described later. In the present embodiment, “a ridge line portion extending linearly in the longitudinal direction of the vehicle body” is synonymous with “a bent portion that is bent when viewed from the longitudinal direction of the vehicle body and extends linearly in the longitudinal direction of the vehicle body”.

  The left and right ridge lines 46 and 48 are formed over substantially the entire area in the longitudinal direction of the on-floor reinforcing member 42 (the region in the longitudinal direction of the vehicle body where the outer wall 42B and the inner wall 42C are provided). That is, the left and right ridge line portions 46 and 48 are continuously formed from the front end portion to the rear end portion of the floor reinforcing member 42 without interruption. By forming these ridge lines 46 and 48, the rigidity of the on-floor reinforcing member 42 with respect to the load in the longitudinal direction of the vehicle body is improved, and the on-floor reinforcing member 42 is hardly buckled by the load in the longitudinal direction of the vehicle body.

  Similarly, a pair of left and right ridge lines 50 and 52 extending linearly in the longitudinal direction of the vehicle body are formed at the lower end of the underfloor reinforcement member 44. The ridge line portion 50 on the outer side in the vehicle body width direction is a bent portion formed at the boundary between the lower wall portion 44A and the outer wall portion 44B, and the ridge line portion 52 on the inner side in the vehicle body width direction is formed between the lower wall portion 44A and the inner wall portion 44C. It is the bending part formed in the boundary. These ridge line portions (bent portions) 50 and 52 are bent at a right angle or a substantially right angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body. These ridge lines 50 and 52 are formed over the entire area in the longitudinal direction of the underfloor reinforcing member 44. That is, the left and right ridge lines 50 and 52 are formed continuously from the front end to the rear end of the underfloor reinforcement member 44 without interruption. By forming these ridge line portions 50 and 52, the rigidity of the underfloor reinforcing member 44 against the load in the longitudinal direction of the vehicle body is improved.

  As shown schematically in FIG. 5, the left and right reinforcing members 24 having the above-described configuration are such that at least a part of each rear end portion (here, the rear end portion of the on-floor reinforcing member 42) is a vehicle body with respect to the rear bumper reinforcement 18. Overlapping in the front-rear direction. The left and right reinforcing members 24 overlap at least part of their front end portions with the left and right side portions 22A of the rear suspension member 22 when viewed from the front-rear direction of the vehicle body. Specifically, at least a part of each front end portion of the left and right reinforcing members 24 overlaps with the left and right side portions 22A when viewed in the longitudinal direction of the vehicle body. A rear cross member 20 is interposed between the front end portions of the left and right reinforcing members 24 and the left and right side portions 22A of the rear suspension member 22.

  Further, in the left and right reinforcing members 24 having the above-described configuration, as shown in FIG. 4, the on-floor reinforcing member 42 and the under-floor reinforcing member 44 are arranged so that the positions of the front ends in the longitudinal direction of the vehicle body coincide. The front end of the floor reinforcing member 42 is located away from the rear cross member 20 on the vehicle body rear side, and a gap (space) is formed between the front end of the floor reinforcing member 42 and the rear cross member 20. Has been.

(Front bracket 26)
The left and right front brackets 26 are formed by press-molding a metal plate such as a steel plate, for example, and are formed in a substantially hat shape with a cross-sectional shape viewed from the front-rear direction of the vehicle body opened to the vehicle body lower side. Specifically, as shown schematically in FIG. 6, the left and right front brackets 26 include an upper wall portion 26A and an outer wall portion 26B extending from the both ends in the vehicle width direction of the upper wall portion 26A to the vehicle body lower side. And an inner wall portion 26C. The lower end portion of the outer wall portion 26B is bent outward in the vehicle body width direction, and the lower end portion of the inner wall portion 26C is bent inward in the vehicle body width direction. Further, the inner wall portion 26C is set to have a longer dimension in the vertical direction of the vehicle body than the outer wall portion 26B.

  The front end portions of the left and right floor reinforcing members 42 are fitted inside the rear side of the left and right front brackets 26. Specifically, the upper wall portion 26A is overlapped with the upper wall portion 42A from the upper side of the vehicle body, the outer wall portion 26B is overlapped with the outer wall portion 42B from the outer side in the vehicle width direction, and the inner wall portion 26C is The inner wall portion 42C is superimposed from the inner side in the vehicle body width direction. The upper wall portion 26A and the upper wall portion 42A are fastened and fixed by a pair of front and rear bolts 31 and nuts 33 (see FIGS. 1, 2, and 4), and the inner wall portion 26C and the inner wall portion 42C are a pair of front and rear. The bolt 35 and the nut 37 (see FIGS. 1, 2 and 4) are fastened and fixed. Thereby, the left and right front brackets 26 are fixed to the front end portions of the left and right reinforcing members 24.

  Further, a front flange 26F extending upward from the vehicle body is formed from the front end of the upper wall portion 26A. The front flange 26F is superposed on the rear wall 38B of the floor cross member 38 of the rear cross member 20 from the rear side of the vehicle body, and is fastened and fixed to the rear wall 38B by bolts 39 and nuts 41 (see FIG. 4). Has been. Thus, the front end portions of the left and right front brackets 26 are fixed to the rear cross member 20, and the rear cross member 20 and the left and right reinforcing members 24 are connected by the front bracket 26.

  The left and right front brackets 26 are formed with a pair of left and right ridge lines 54 and 56 extending linearly in the longitudinal direction of the vehicle body. The ridge line portion 54 on the outer side in the vehicle body width direction is a bent portion formed at the boundary between the upper wall portion 26A and the outer wall portion 26B, and the ridge line portion 56 on the inner side in the vehicle body width direction is between the upper wall portion 26A and the inner wall portion 26C. It is the bending part formed in the boundary. These ridge line portions (bent portions) 54 and 56 are bent at a right angle or a substantially right angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body. These ridge lines 54 and 56 are formed over the entire length of the left and right front brackets 26. That is, the left and right ridge lines 54 and 56 are formed continuously from the front end to the rear end of the front bracket 26 without interruption. By forming these ridge line portions 54 and 56, the rigidity of the front bracket 26 against the load in the longitudinal direction of the vehicle body is improved.

(Function and effect)
Next, the operation and effect of the first embodiment will be described.

  In the vehicle body rear structure 10 having the above-described configuration, when a rear collision occurs, the rear collision load is input to the left and right rear side members 14 and the left and right reinforcing members 24 disposed on the inner side in the vehicle width direction of the left and right rear side members 14. . The left and right reinforcing members 24 are disposed on the vehicle rear side of the rear suspension member 22 with the longitudinal direction of the vehicle body as a longitudinal direction, and at least a part of each front end portion of the vehicle body with respect to the left and right side portions 22A of the rear suspension member 22 Overlapping in the front-rear direction. For this reason, when the left and right reinforcing members 24 are engaged with the left and right side portions 22A of the rear suspension member 22 from the rear side of the vehicle body (here, contacted via the rear cross member 20), the rear impact load is increased. Is transmitted to the front side of the vehicle body through the reinforcing member 24 and the rear suspension member 22 (see arrow A in FIGS. 7 and 8). These reinforcing members 24 have ridge line portions 46, 48, 50, and 52 that extend linearly in the longitudinal direction of the vehicle body, and since the rigidity against the rear impact load is high, the rear impact load is placed on the front side of the vehicle body. It can be transmitted efficiently. As a result, the deformation amount (deformation stroke) at the rear of the vehicle body is reduced.

  In addition, since the rear suspension member 22 is used to transmit the rear impact load to the front side of the vehicle body, the input load to the entire vehicle body can be increased without improving the proof stress of the left and right rear side members 14. That is, when the rear suspension member 22 is not used to transmit the rear impact load to the front side of the vehicle body, the rear impact load is transmitted from the left and right rear side member rear portions 14B to the left and right rear side member front portions 14A. The rear impact load input to the left and right reinforcing members 24 is transmitted via the rear cross member 20. For this reason, in order to improve the yield strength of the left and right rear side member front portions 14A, it is necessary to reinforce the left and right rear side member front portions 14A. As a result, the mass of the vehicle body increases, but this can be avoided in the present embodiment.

  In the present embodiment, the rear end portions of the left and right rear side members 14 are connected in the vehicle body width direction by the rear bumper reinforcement 18, and the left and right reinforcing members 24 have at least a part of the rear end portions of the rear bumper reinforcement. It overlaps with the ment 18 in the longitudinal direction of the vehicle body. Therefore, the rear impact load input to the rear bumper reinforcement 18 is distributed and input to the left and right rear side members 14 and the left and right reinforcing members 24. Thereby, the transmission path | route to the vehicle body front side of the rear impact load input into the rear bumper reinforcement 18 can be increased. Further, compared with the case where at least a part of the rear end portions of the left and right reinforcing members 24 do not overlap the rear bumper reinforcement 18 in the longitudinal direction of the vehicle body, the rear impact load is applied to the left and right reinforcing members 24 at an early stage. Can communicate.

  Further, in the present embodiment, a rear cross member 20 is provided in which the front and rear intermediate portions of the left and right rear side members 14 are connected in the vehicle body width direction, and the rear cross member 20 is provided on the left and right sides of the left and right reinforcing members 24 and the rear suspension member 22. Between the side portion 22A. Therefore, the rear impact load input to the left and right reinforcing members 24 is transmitted to the left and right side portions 22A of the rear suspension member 22 via the rear cross member 20. Thereby, compared with the case where the rear cross member 20 is not interposed between the left and right reinforcing members 24 and the left and right side portions 22A, the transmission of the rear impact load to the left and right side portions 22A is accelerated. Can do.

  In the present embodiment, the left and right reinforcing members 24 include an on-floor reinforcing member 42 coupled to the upper surface of the rear floor pan rear portion 12C and an underfloor reinforcing member 44 coupled to the lower surface of the rear floor pan rear portion 12C. . As a result, the portions on the opposite side of the floor reinforcing member 42 and the floor reinforcing member 44 from the rear floor pan 12 (the upper end portion of the floor reinforcing member 42 and the lower end portion of the floor reinforcing member 44) are irrelevant to the shape of the rear floor pan 12. The ridge line portions 46, 48, 50, 52 extending linearly in the longitudinal direction of the vehicle body can be set respectively. As a result, compared to the case where the left and right reinforcing members 24 are coupled to only the upper surface of the rear floor pan 12 or only the lower surface of the rear floor pan 12, the number of the linear ridge lines formed on the left and right reinforcing members 24 is reduced. Can be increased.

  In the present embodiment, left and right front brackets 26 that connect the front end portions of the left and right reinforcing members 24 and the rear cross member 20 are provided. Therefore, the rear impact load input to the left and right reinforcing members 24 is transmitted to the rear cross member 20 via the left and right front brackets. Thereby, the transmission of the load to the rear cross member 20 can be accelerated. In addition, since the left and right front brackets 26 are formed with ridges 54 and 56 that extend linearly in the longitudinal direction of the vehicle body, the rigidity against the rear impact load is increased. Can communicate well. Further, for example, as compared with the case where the front end portions of the left and right reinforcing members 24 are directly coupled to the rear cross member 20, the assembly work of the left and right reinforcing members 24 to the rear portion of the vehicle body is facilitated.

(Various modifications of the first embodiment)
Next, various modifications of the first embodiment will be described. In addition, about the structure and effect | action similar to 1st Embodiment, the same code | symbol as 1st Embodiment is provided, and the description is abbreviate | omitted. Although not shown in the drawings, also in the following various modifications, the reinforcing member 24 is disposed so that at least a part of the front end portion overlaps the rear suspension member 22 when viewed in the vehicle longitudinal direction.

(First modification)
FIG. 9 is a schematic cross-sectional view corresponding to FIG. 5 showing the peripheral configuration of the reinforcing member 24 according to the first modification of the first embodiment. In the first modification, the underfloor reinforcing member 44 is omitted, and the reinforcing member 24 is configured only by the above-ground reinforcing member 42. In the first modification, the configuration can be simplified as compared with the first embodiment.

(Second modification)
FIG. 10 is a schematic cross-sectional view corresponding to FIG. 5 illustrating the peripheral configuration of the reinforcing member 24 according to the second modification of the first embodiment. In the second modification, the on-floor reinforcing member 42 is omitted, and the reinforcing member 24 is configured only by the under-floor reinforcing member 44. Also in the second modification, the configuration can be simplified as compared with the first embodiment. In the second modification, a large luggage space formed above the rear floor pan rear portion 12C can be secured.

(Third Modification)
FIG. 11 shows a peripheral configuration of a reinforcing member 24 according to a third modification of the first embodiment in a sectional view seen from the left side of the vehicle body. In the third modified example, the rear end portion of the floor reinforcing member 42 is located away from the lower back 16 on the vehicle body front side, and the rear end portion of the floor reinforcing member 42 and the lower back 16 are connected by the rear bracket 58. Has been. The rear bracket 58 includes an upper wall portion 58A similar to the front bracket 26, an outer wall portion (not shown) extending from the outer end portion in the vehicle width direction of the upper wall portion 58A to the vehicle body lower side, and an inner side in the vehicle width direction of the upper wall portion 58A. And an inner wall 58B extending from the end to the vehicle body lower side, and the rear end of the floor reinforcing member 42 is fitted inside. The plurality of bolts 59 and nuts (not shown) are used to fasten and fix the floor reinforcing member 42. The rear bracket 58 has a rear flange 58C extending from the rear end of the upper wall portion 58A to the vehicle body upper side. Thereafter, the flange 58 </ b> C is fastened and fixed to the lower back 16 using a bolt 61 and a nut 63. Although not described in detail, a pair of left and right ridge lines extending linearly in the longitudinal direction of the vehicle body is formed at the upper end of the rear bracket 58 from the front end to the rear end.

  In the third modification, the rear impact load input to the lower back 16 is input to the left and right floor reinforcement members 42 via the left and right rear brackets 58. Thereby, the transmission of the rear impact load to the left and right floor reinforcing members 42, that is, the left and right reinforcing members 24, can be accelerated. In addition, since the left and right front brackets 26 are formed with a pair of left and right ridge lines extending linearly in the longitudinal direction of the vehicle body, the rigidity against the rear collision load is increased, so that the rear collision load is efficiently transmitted to the front side of the vehicle body. Can communicate well. Further, for example, as compared with the case where the rear end portions of the left and right reinforcing members 24 are directly coupled to the lower back 16, the assembly work of the left and right reinforcing members 24 to the rear portion of the vehicle body is facilitated.

(Fourth modification)
FIG. 12 shows a cross-sectional view of the peripheral configuration of the reinforcing member 24 according to the fourth modification of the first embodiment viewed from the left side of the vehicle body. The fourth modification includes a rear bracket 58 similar to the rear bracket 58 according to the third modification, while the front bracket 26 according to the first embodiment is omitted. The front end portion of the on-floor reinforcing member 42 is directly coupled to the rear surface of the rear cross member 20 (the rear wall portion 38B of the on-floor cross member 38). In the fourth modified example, the front bracket 26 is omitted, so that the configuration can be simplified. Note that the front end portion of the floor reinforcing member 42 may be configured to be in contact with or close to the rear surface of the rear cross member 20.

(5th modification)
FIG. 13 is a cross-sectional view of the peripheral configuration of the reinforcing member 24 according to the fifth modification of the first embodiment viewed from the left side of the vehicle body. In the fifth modification, the front bracket 26 according to the first embodiment is omitted. In the fifth modification, the front end portion of the floor reinforcing member 42 is directly coupled to the rear surface of the rear cross member 20 (the rear wall portion 38B of the floor cross member 38). The rear end portions of the upper floor reinforcing member 42 and the lower floor reinforcing member 44 are directly coupled to the lower back 16. In the fifth modification, the configuration can be further simplified than in the fourth modification. The front end of the floor reinforcing member 42 is disposed in contact with or close to the rear surface of the rear cross member 20, and the rear ends of the floor reinforcing member 42 and the floor reinforcing member 44 are in contact with the lower back 16. Or you may make it the structure arrange | positioned closely.

<Second Embodiment>
Next, a vehicle body rear structure 70 according to a second embodiment of the present invention will be described with reference to FIGS. 14 to 27B. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  As shown in FIGS. 14 to 17, the vehicle body rear structure 70 according to the second embodiment of the present invention is similar to the vehicle body rear structure 10 according to the first embodiment, and includes a rear floor pan 12 and a pair of left and right rear side members 14. And a lower back 16, a rear bumper reinforcement 18, a rear cross member 20, a rear suspension member 22, and a pair of left and right reinforcing members 72. Further, the vehicle body rear structure 70 includes a pair of left and right front connection brackets 74 and a pair of left and right rear connection brackets 76. Both the left and right front connection brackets 74 and the left and right rear connection brackets 76 correspond to “left and right connection portions”.

  The rear floor pan 12, the left and right rear side members 14, the lower back 16, the rear bumper reinforcement 18, and the rear suspension member 22 are basically the same except that the shape and dimensions are slightly different from those of the first embodiment. Therefore, in each figure, the same reference numerals as those in the first embodiment are given. Hereinafter, differences from the first embodiment will be mainly described in detail.

  In this embodiment, the rear cross member 20 does not include the underfloor cross member 40 according to the first embodiment. In addition, this embodiment is configured not to include the front bracket 26 according to the first embodiment. In this embodiment, the left and right reinforcing members 72 are different from the left and right reinforcing members 24 according to the first embodiment. In this embodiment, the left and right side portions 22A of the rear suspension member 22 are provided with a pair of left and right load receiving portions 78 (see FIG. 17: not shown in FIGS. 14 to 16). In this embodiment, left and right bulk members 82 (see FIG. 17: not shown in FIGS. 14 to 16) are disposed in the closed cross section of the rear cross member 20. Further, this embodiment includes a pair of left and right fasteners 80 (see FIG. 17: not shown in FIGS. 14 to 16) in which the rear bumper reinforcement 18 and the lower back 16 are directly fastened and fixed. The left and right fasteners 80 correspond to “left and right protrusions”. Hereinafter, these components will be described.

(Left and right reinforcement members 72)
The left and right reinforcing members 72 are disposed on the inner side in the vehicle width direction of the left and right rear side member rear portions 14B and on the vehicle body rear side of the rear suspension member 22. These reinforcing members 24 are formed in a long shape with the longitudinal direction of the vehicle body as the longitudinal direction, and are disposed close to the left and right rear side member rear portions 14B, and are disposed substantially parallel to the left and right rear side member rear portions 14B. Yes. In the present embodiment, the left and right reinforcing members 72 are slightly inclined with respect to the longitudinal direction of the vehicle body so that the front end portion is located slightly inside the vehicle width direction with respect to the rear end portion. These reinforcing members 72 are constituted by a reinforcing member main body 84, a front plate 86, and a rear plate 88.

  The reinforcing member main body 84 is formed, for example, by extrusion molding of a metal material, and is formed in a long shape with the longitudinal direction of the vehicle body in the longitudinal direction. As shown in FIG. 23, the reinforcing member main body 84 is formed in a shape in which a cross-shaped rib is provided in a substantially hexagonal cross section when viewed from the longitudinal direction of the vehicle body.

  Specifically, the reinforcing member main body 84 includes an upper wall portion 84A and a lower wall portion 84B, and an outer wall portion 84C that connects the outer end portions of the upper wall portion 84A and the lower wall portion 84B in the vehicle body width direction in the vehicle body vertical direction. And an inner wall portion 84D that connects the end portions of the upper wall portion 84A and the lower wall portion 84B on the inner side in the vehicle body width direction in the vehicle body vertical direction. The outer wall portion 84C is bent inward in the vehicle width direction at the intermediate portion in the vertical direction, and the lower side is inclined toward the vehicle width direction inner side and the vehicle body lower side. The inner wall portion 84D is bent outward in the vehicle width direction at the intermediate portion in the vertical direction, and the lower side is inclined toward the vehicle width direction outer side and the vehicle body lower side. The upper wall portion 84A, the lower wall portion 84B, the outer wall portion 84C, and the inner wall portion 84D form a closed cross section that extends in the longitudinal direction of the vehicle body. That is, the reinforcing member main body 84 forms a single closed cross section extending in the longitudinal direction of the vehicle body.

  Further, the reinforcing member main body 84 includes vertical ribs 84E and horizontal ribs 84F disposed on the inner side of the closed cross section. The vertical rib 84E connects the center part in the vehicle body width direction of the upper wall part 84A and the lower wall part 84B in the vehicle body vertical direction, and the horizontal rib 84F connects the vehicle body vertical direction center part of the outer wall part 84C and the inner wall part 84D to the vehicle body width. Connected in the direction. The vertical rib 84E central portion in the vehicle body vertical direction and the horizontal rib 84F in the vehicle width direction central portion are integrated, and the vertical rib 84E and the horizontal rib 84F intersect each other.

  A pair of left and right ridge lines 90 and 92 extending linearly in the longitudinal direction of the vehicle body are formed at the upper end of the reinforcing member main body 84. The ridge line portion 90 on the outer side in the vehicle body width direction is a bent portion formed at the boundary between the upper wall portion 84A and the outer wall portion 84C. Further, the ridge line portion 92 on the inner side in the vehicle body width direction is a bent portion formed at the boundary between the upper wall portion 84A and the inner wall portion 84D. These ridge line portions (bent portions) 90 and 92 are bent at a right angle or a substantially right angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body.

  In addition, a pair of left and right ridge lines 94 and 96 extending linearly in the longitudinal direction of the vehicle body are formed at the lower end of the reinforcing member main body 84. The ridge line portion 94 on the outer side in the vehicle body width direction is a bent portion formed at the boundary between the lower wall portion 84B and the outer wall portion 84C. The ridgeline portion 96 on the inner side in the vehicle body width direction is a bent portion formed at the boundary between the lower wall portion 84B and the inner wall portion 84D. These ridge line portions (bent portions) 94 and 96 are bent at an obtuse angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body.

  Further, a pair of left and right ridge lines 98 and 100 extending linearly in the longitudinal direction of the vehicle body are formed in the middle part of the reinforcing member main body 84 in the vertical direction. The ridgeline portion 98 on the outer side in the vehicle body width direction is a bent portion formed in the middle portion in the vertical direction of the outer wall portion 84C. Further, the ridge line portion 100 on the inner side in the vehicle body width direction is a bent portion formed in the middle portion in the vertical direction of the inner wall portion 84D. These ridge line portions (bent portions) 98 and 100 are bent at an obtuse angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body. The ridge line portions 90, 92, 94, 96, 98, 100 are continuously formed from the front end portion to the rear end portion of the reinforcing member 72 without interruption. The left and right reinforcing member main bodies 84 are formed with the ridgeline portions 90, 92, 94, 96, 98, and 100, so that the rigidity with respect to the load in the longitudinal direction of the vehicle body is improved. Note that the ridge line portions 90, 92, 94, 96, 98, and 100 are bent in an arc shape when viewed from the front-rear direction of the vehicle body.

  On the other hand, as shown in FIGS. 17 and 23, the front plate 86 is formed in a plate shape with metal, and is disposed in front of the reinforcing member main body 84 in a posture in which the plate thickness direction is along the vehicle longitudinal direction. ing. The front plate 86 is coupled to the front end portion of the reinforcing member main body 84 by means such as welding. Similarly, the rear plate 88 is formed in a plate shape with metal, and includes a plate main body 88A disposed on the rear side of the reinforcing member main body 84 in a posture in which the plate thickness direction is along the longitudinal direction of the vehicle body. The plate body 88A is coupled to the rear end portion of the reinforcing member body 84 by means such as welding. A plurality of through holes 102 and 104 are formed in the front plate 86 and the plate main body 88A. One of the plurality of through-holes 104 formed in the plate main body 88A (the through-hole denoted by reference numeral 104A in FIGS. 17, 20, and 23) corresponds to a “hole” and is described later. It corresponds to the tool 80.

  Further, the rear plate 88 has a connecting piece 88B that extends obliquely from the upper end of the plate main body 88A to the vehicle body upper side and the vehicle body rear side. The connecting piece 88B uses a pair of left and right bolts 106 (see FIGS. 14 to 17: not shown in FIG. 20) and a pair of left and right nuts 108 (see FIGS. 17 and 22: not shown in FIGS. 14 to 16). The lower back 16 is fastened and fixed. Accordingly, the rear end portion of the reinforcing member 72 is connected to and supported by the lower back 16. In the first embodiment, the lower back 16 is schematically illustrated in FIG. 4, but the lower back 16 is overlapped with the lower back panel 110 and the vehicle rear side of the lower back panel 110 as shown in FIG. 17. And lower back reinforcement 112. The bolt 106 passes through both the lower back panel 110 and the lower back reinforcement 112.

(Configuration of the front connection bracket 74)
As shown in FIGS. 14, 15, and 16, the left and right front connection brackets 74 are formed, for example, by pressing a metal plate, and are formed in a long plate shape. The left and right front connection brackets 74 are disposed above the vehicle body at the front end portions of the left and right reinforcing members 72 in a posture in which the longitudinal direction is inclined with respect to the vehicle body longitudinal direction. Specifically, the left and right front connection brackets 74 are inclined so that the front end portion, which is one end portion in the longitudinal direction, is located on the inner side in the vehicle body width direction than the rear end portion, which is the other end portion in the longitudinal direction.

  The parts on the inner side in the vehicle width direction of the left and right front connection brackets 74 are bent in a crank shape on the lower side of the vehicle body. As a result, a flange-like joint 74 </ b> A is formed at the inner end of the front connection bracket 74 in the vehicle width direction. The joining portion 74A is superimposed on the upper surface of the upper wall portion 84A of the reinforcing member main body 84, and is joined to the upper wall portion 84A by means such as welding. In addition, you may make it the structure which the site | part inside the vehicle width direction of the front connection bracket 74 is fixed to the upper wall part 84A by bolt fastening.

  The front end portions of the left and right front connection brackets 74 are superimposed on the upper surface of the upper wall portion 38A of the rear cross member 20 as shown in FIGS. The wall 38A is fastened and fixed. Thus, the front end portions of the left and right reinforcing members 72 are connected to and supported by the rear cross member 20. In other words, in the present embodiment, the left and right reinforcing members 72 have their front ends supported by the rear cross member 20 and their rear ends supported by the lower back 16. As a result, the left and right reinforcing members 72 are arranged slightly spaced above the vehicle body with respect to the rear floor pan rear portion 12C. That is, in this embodiment, the left and right reinforcing members 72 are not coupled to the rear floor pan rear portion 12C.

  Further, the rear end portions of the left and right front connection brackets 74 are superimposed on the upper surface of the rear side member rear portion 14B adjacent to the outer side in the vehicle body width direction, and are fastened and fixed to the rear side member rear portion 14B by bolts 116 and nuts (not shown). . Thereby, the front end part of each reinforcement member 72 is connected with each rear side member rear part 14B located in the vehicle body width direction outer side of each reinforcement member 72.

  On the other hand, as shown in FIGS. 14 and 15, the left and right rear connection brackets 76 (not shown in FIG. 17) are formed, for example, by press-molding a metal plate, and are substantially L-shaped in plan view. Is formed. In these rear connection brackets 76, the portion on the inner side in the vehicle width direction protrudes toward the front side of the vehicle body than the portion on the outer side in the vehicle width direction. These rear connection brackets 76 are arranged on the vehicle body upper side with respect to the left and right reinforcing members 72 and the left and right rear side member rear portions 14B, and are formed between the rear end portions of the left and right reinforcing members 72 and the left and right rear side member rear portions 14B. It is bridged between.

  The parts on the inner side in the vehicle width direction of the left and right rear connection brackets 76 are bent in a crank shape on the lower side of the vehicle body. As a result, a flange-like joint 76 </ b> A is formed at the inner end of each rear connection bracket 76 in the vehicle width direction. The joining portion 74A is superimposed on the upper surface of the upper wall portion 84A of the reinforcing member main body 84, and is joined to the upper wall portion 84A by means such as welding. In addition, you may make it the structure by which the site | part of the vehicle body width direction inside of the back connection bracket 76 is fixed to the upper wall part 84A by bolt fastening.

  The ends of the left and right rear connection brackets 76 on the outer side in the vehicle width direction are superimposed on the upper surface of the rear side member rear portion 14B adjacent to the outer side in the vehicle width direction, and are fastened and fixed to the rear side member rear portion 14B by bolts 118 and nuts (not shown). ing. Accordingly, the rear end portion of each reinforcing member 72 is connected to each rear side member rear portion 14 </ b> B located on the outer side in the vehicle width direction of each reinforcing member 72.

(Left and right load receiving part 78)
The left and right load receiving portions 78 are disposed on the rear side of the left and right side portions 22A of the rear suspension member 22, and project from the left and right side portion main bodies 77 which are the main bodies of the left and right side portions 22A upward. Yes. The left and right side portion main bodies 77 are arranged with the longitudinal direction of the vehicle body as a longitudinal direction, and the rear end portion 22A1 and a front end portion (not shown) are attached to the left and right rear side member front portions 14A. The left and right load receiving portions 78 constitute a part of the left and right side portions 22A. These load receiving portions 78 are made of metal, are formed in a rectangular shape when viewed from the front-rear direction of the vehicle body, and are formed in a substantially triangular shape when viewed from the vehicle body width direction.

  As shown in FIG. 18A, each load receiving portion 78 is connected to the pair of left and right side wall portions 78A and 78B and the rear end portions of the left and right side wall portions 78A and 78B in the vehicle body width direction and extends in the vehicle body vertical direction. A wall portion 78C, a front wall portion 78D extending from the upper end of the rear wall portion 78C to the vehicle body front obliquely downward side, and an inner wall disposed between the rear wall portion 78C and the front wall portion 78D and extending to the vehicle body front obliquely lower side. 78E.

  The left and right side walls 78A, 78B, the rear wall 78C, and the front wall 78D are formed by bending a single metal plate and are integrally formed. And the inner wall 78E formed separately from the rear wall part 78C, the front wall part 78D and the left and right side wall parts 78A, 78B by a metal plate is joined to the left and right side wall parts 78A, 78B by welding. The rear wall 78C, the front wall 78D, and the left and right side walls 78A and 78B are joined to the upper surface of the side body 77 by welding.

  As shown schematically in FIG. 18B, the left and right load receiving portions 78 of the above configuration overlap the lower side of each front end portion of the left and right reinforcing members 72 in the longitudinal direction of the vehicle body. That is, in the present embodiment, the left and right reinforcing members 72 overlap at least partly with respect to the left and right load receiving portions 78 in the vehicle body longitudinal direction.

(Left and right bulk member 82)
As shown in FIGS. 17, 19A, and 19B, the left and right bulk members 82 have a substantially box-shaped bulk body 120 that is open on the vehicle body upper side and vehicle body rear side, and a substantially inverted L when viewed from the vehicle body left side. The lid member 122 bent in a letter shape is coupled to form a box shape. The bulk body 120 and the lid member 122 are formed of, for example, a metal plate. The bulk body 120 includes a pair of left and right side wall portions 120A and 120B, a lower wall portion 120C that connects lower end portions of the left and right side wall portions 120A and 120B in the vehicle body width direction, and a front end portion of the left and right side wall portions 120A and 120B. And a front wall 120D connected in the width direction. Further, the bulk body 120 includes left and right rear flanges 120E (not shown in FIG. 19A) extending from the rear end portions of the left and right side wall portions 120A and 120B to the opposite sides, and upper ends of the left and right side wall portions 120A and 120B. It has left and right upper flanges 120F (not shown in FIG. 19A) extending to opposite sides.

  The lid member 122 has an upper wall portion 122A and a rear wall portion 122B extending from the rear end of the upper wall portion 122A to the vehicle body lower side. Both end portions in the vehicle body width direction of the upper wall portion 122A are superimposed on the left and right upper flanges 120F of the bulk body 120 from the upper side of the vehicle body, and are coupled to the left and right upper flanges 120F by spot welding. Further, both end portions in the vehicle body width direction of the rear wall portion 122B are overlapped with the left and right rear flanges 120E of the bulk body 120 from the rear side of the vehicle body, and are coupled to the left and right rear flanges 120E by spot welding.

  The left and right bulk members 82 configured as described above are provided in the closed cross section of the rear cross member 20 at both ends in the vehicle width direction of the rear cross member 20, and are fixed to the rear cross member 20 by means such as welding or bolt fastening. The The left and right bulk members 82 are interposed between the front end portions of the left and right reinforcing members 72 and the left and right load receiving portions 78 of the rear suspension member 22.

(Left and right fastener 80)
As shown in FIGS. 17 and 20 to 22, in this embodiment, the rear bumper reinforcement 18 and the lower back 16 are bolts as the left and right fasteners 80 on the inner side in the vehicle width direction than the left and right rear side member rear portions 14B. 124 and a nut 126 are fastened and fixed. The bolt 124 penetrates the rear bumper reinforcement 18 and the lower back 16 from the rear side of the vehicle body, and the nut 126 is screwed to the bolt 124 from the vehicle inner side (vehicle body front side).

  The bolts 124 and the nuts 126 are provided at the rear of the left and right reinforcing members 72, respectively. Specifically, the left and right bolts 124 and nuts 126 are arranged at positions overlapping the through holes 104A formed in the plate main body 88A of the rear plate 88 described above in the longitudinal direction of the vehicle body. And the front end side of the volt | bolt 124 is inserted in 104 A of through-holes. 20 to 22, members denoted by reference numerals 128 and 130 are bolts and nuts that fasten and fix the rear end portion of the rear side member rear portion 14 </ b> B and the rear bumper reinforcement 18.

  In the present embodiment, the front end side of the bolt 124 is normally inserted into the through hole 104A. However, the present invention is not limited to this. In other words, the bolt 124 may be configured such that the tip of the bolt 124 is disposed on the rear side of the vehicle body with respect to the through hole 104A during normal times. In this case, the rear bumper reinforcement 18 approaches the reinforcing member 72 due to the collision load of the rear collision, so that the bolt 124 is inserted into the through hole 104.

(Function and effect)
Next, the operation and effect of the second embodiment will be described.

  In the vehicle body rear structure 70 having the above-described configuration, when a rear collision occurs, the rear impact load input to the rear bumper reinforcement 18 is changed to the left and right rear side members 14 and the left and right rear side members 14 disposed on the inner side in the vehicle width direction. It is distributed to the reinforcing members 24 and input. The left and right reinforcing members 24 are disposed on the vehicle rear side of the rear suspension member 22 with the longitudinal direction of the vehicle body as a longitudinal direction, and at least a part of each front end portion is provided on the left and right side portions 22A of the rear suspension member 22. It overlaps with the left and right load receiving portions 78 in the longitudinal direction of the vehicle body. The rear cross member 20 is interposed between the left and right reinforcing members 72 and the left and right load receiving portions 78.

  For this reason, the left and right reinforcing members 24 come into contact with the left and right load receiving portions 78 of the rear suspension member 22 via the rear cross member 20, so that the rear impact load is applied to the left and right reinforcing members 24 and the left and right suspension members 22. It is transmitted to the front side of the vehicle body via the side portion 22A. Since these reinforcing members 24 are formed with a plurality of ridge line portions 90, 92, 94, 96, 98, 100 extending linearly in the longitudinal direction of the vehicle body, the rigidity against the rear impact load is increased. The impact load can be efficiently transmitted to the front side of the vehicle body. Therefore, also in this embodiment, there exists the same outstanding effect as 1st Embodiment in said point.

  In this embodiment, the left and right reinforcing members 72 have their front ends supported by the rear cross member 20 via the front connection bracket 74, and each rear end has a lower back 16 on the connection piece 88 B of the rear plate 88. It is supported by. As a result, the left and right reinforcing members 72 are not coupled to the rear floor pan rear portion 12C, so the shape of the left and right reinforcing members 72 can be set regardless of the shape of the rear floor pan rear portion 12C. . As a result, it is possible to increase the number of the linear ridge lines formed on the left and right reinforcing members 72 as compared with the case where the left and right reinforcing members 72 are coupled to the rear floor pan rear portion 12C.

  Furthermore, in this embodiment, each reinforcing member 72 and each rear side member rear portion 14B positioned on the outer side in the vehicle width direction with respect to each reinforcing member 72 are respectively connected by a left and right front connecting bracket 74 and a left and right rear connecting bracket 76. It is connected. As a result, each rear side member rear portion 14B and each reinforcing member 72 are reinforced, so that the rigidity of the vehicle body is improved and the steering stability of the vehicle is improved. In addition, the left and right rear side members 14 and the left and right reinforcing members 72 are unlikely to be deformed in different directions due to the rear impact load, so that the deformation mode of the rear portion of the vehicle body can be stabilized.

  In this embodiment, the rear end portions of the left and right reinforcing members 72 are located away from the rear bumper reinforcement 18 toward the front of the vehicle body, and the rear ends of the left and right reinforcing members 72 are separated from the rear bumper reinforcement 18. The front end side of the bolt 124 protruding to the end side is inserted into a through hole 104 </ b> A formed in the rear plate 88 of the left and right reinforcing members 72. For this reason, when another vehicle or the like (see barrier B in FIGS. 24A and 24B) collides with the rear bumper reinforcement 18 and the rear bumper reinforcement 18 is displaced toward the left and right reinforcing members due to the collision load of the rear collision. The left and right bolts 124 are inserted deeper into the left and right through holes 104A. As a result, the right and left reinforcing members 72 and the rear bumper reinforcement 18 can be prevented or suppressed from being displaced due to the rear impact load, so that the rear impact load input to the rear bumper reinforcement 18 is favorably applied to the left and right reinforcing members 72. Can communicate.

  That is, as in the comparative example 200 shown in FIGS. 25A and 25B, in the configuration not including the bolt 124 and the through hole 104A, as shown in FIG. 25B, the rear collision input to the rear bumper reinforcement 18 is not performed. There is a possibility that the left and right reinforcing members 72 are pushed upward by the collision load (see arrow C in FIG. 25B). In such a case, the load transmission efficiency from the rear bumper reinforcement 18 to the left and right reinforcing members 72 is significantly reduced, but this can be avoided in the present embodiment. 25A and 25B, the connecting piece 88B of the rear plate 88, the bolt 106, and the nut 108 are not shown.

  In addition, since it is not necessary to connect or connect the left and right reinforcing members 72 and the rear bumper reinforcement 18 in order to prevent or suppress the above-described displacement, it is easy to assemble the left and right reinforcing members to the rear part of the vehicle body. become. Moreover, since the above positional shift is prevented or suppressed using the fastener 80 which fastened the lower back | bag 16 and the rear bumper reinforcement 18, the structure can be simplified.

  Furthermore, in the present embodiment, the rear suspension member 22 includes left and right load receiving portions 78 that protrude from the left and right side portion main bodies 77, which are the main bodies of the left and right side portions 22A, to the upper side of the vehicle body. Reinforcing members 72 have their front end portions overlapped with the left and right load receiving portions 78 in the longitudinal direction of the vehicle body. Accordingly, the left and right reinforcing members 72 come into contact with the left and right load receiving portions 78 via the rear cross member 20 as the left and right reinforcing members 72 approach the left and right side portions 22A by the rear impact load. As a result, the rear impact load is transmitted from the left and right reinforcing members 72 to the left and right side portions 22A.

  The left and right load receiving portions 78 protrude from the left and right side portion main bodies 77 toward the vehicle body upper side. For this reason, for example, even when it is difficult to arrange the left and right reinforcing members 72 so that at least a part of the front end portions of the left and right reinforcing members 72 overlap the left and right side portion main bodies 77 in the longitudinal direction of the vehicle body. The load can be transmitted from the left and right reinforcing members 72 to the left and right side portions 22A. Therefore, the degree of freedom of arrangement of the left and right reinforcing members 72 is improved.

  In the present embodiment, the left and right bulk members 82 provided in the closed cross section of the rear cross member 20 are provided between the front end portions of the left and right reinforcing members 72 and the left and right load receiving portions 78 of the rear suspension member 22. Is intervening. For this reason, when the rear impact load input to the left and right reinforcing members 72 is transmitted to the rear suspension member 22 via the rear cross member 20, it is confirmed that the closed cross section of the rear cross member 20 is crushed. 82 can be suppressed. Thereby, the transmission efficiency of the rear impact load via the rear cross member 20 can be improved.

(Various modifications of the second embodiment)
Next, various modifications of the second embodiment will be described. In addition, about the structure and effect | action similar to 2nd Embodiment, the same code | symbol as 2nd Embodiment is provided, and the description is abbreviate | omitted.

(First modification)
FIG. 26 shows a cross-sectional view of the peripheral configuration of the reinforcing member 72 according to the first modification of the second embodiment corresponding to a part of FIG. In this first modification, the rear plate 88 of the left and right reinforcing members 72 (only the reinforcing member 72 on the left side of the vehicle body is shown in FIG. 17) is fastened and fixed to the rear bumper reinforcement 18 by bolts 124 and nuts 126. In the first modified example, the assembling property of the left and right reinforcing members 72 with respect to the rear part of the vehicle body is lowered as compared with the second embodiment, but the rear impact load input to the rear bumper reinforcement 18 is changed to the left and right reinforcing members 72. Can be communicated early.

(Second modification)
FIG. 27A shows a schematic cross-sectional view of a peripheral configuration of a reinforcing member 72 according to a second modification of the second embodiment as viewed from the left side of the vehicle body. FIG. The peripheral configuration of the reinforcing member 72 according to the modification is shown in a schematic bottom view as seen from the vehicle body lower side. In the second modification, the reinforcing member 72 is disposed on the vehicle body lower side of the rear floor pan rear portion 12C. The front end portion of the reinforcing member 72 is fixed to the lower surface of the rear cross member 20 by bolt fastening and is supported by the rear cross member 20. The rear end portion of the reinforcing member 72 is fixed to the front surface of the lower back 16 by bolt fastening and is supported by the lower back 16. Also in the second modified example, the reinforcing member 72 is arranged such that at least a part of the front end portion overlaps the left and right side portions 22A of the rear suspension member 22 when viewed in the vehicle longitudinal direction. In the second modification, the luggage floor formed above the rear floor pan rear portion 12C can be widened.

<Third Embodiment>
Next, a vehicle body rear structure 140 according to a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the configuration of the left and right reinforcing members 142 is different from the configuration of the reinforcing member 72 according to the second embodiment, but the other configurations are the same as those of the second embodiment. For this reason, in FIG. 28, the same reference numerals as those in the second embodiment are assigned to configurations that are basically the same as those in the second embodiment. In addition, since the vehicle body rear structure 140 according to this embodiment is configured to be bilaterally symmetric, illustration of the right side of the vehicle body is omitted in FIG. 28 and description of the configuration of the right side of the vehicle body is omitted. In FIG. 28, 22C is a front cross member portion of the rear suspension member 22, and 22A2 is a front end portion of the side portion 22A.

  As shown in FIGS. 28 and 29, the left and right reinforcing members 142 include a reinforcing member main body 144 and a lid member 146. The reinforcing member main body 144 and the lid member 146 are formed of a metal plate such as a steel plate. The reinforcing member main body 144 is formed in a box shape in which the longitudinal direction of the vehicle body is the longitudinal direction and the upper side of the vehicle body is opened. Specifically, the reinforcing member main body 144 includes left and right side wall portions 144A and 144B, a lower wall portion 144C connecting the lower end portions of the left and right side wall portions 144A and 144B in the vehicle body width direction, and left and right side wall portions 144A and 144B. A front wall portion 144D that connects the front end portions in the vehicle body width direction, and a rear wall portion 144E that connects the rear end portions of the left and right side wall portions 144A and 144B in the vehicle body width direction.

  Further, the reinforcing member main body 144 extends from the upper end portion of the side wall portion 144A on the outer side in the vehicle body width direction to the outer side of the vehicle body width direction 144F and from the upper end portion of the side wall portion 144B on the inner side of the vehicle body width direction to the inner side in the vehicle body width direction. And an inner flange 144G. The outer flange 144F is provided with a pair of front and rear connecting portions 144F1 and 144F2 protruding outward in the vehicle body width direction. The reinforcing member main body 144 is formed with a pair of upper and lower ridge lines 148 and 150 extending linearly in the longitudinal direction of the vehicle body.

  The upper ridge line portion 148 is a bent portion formed between the side wall portion 144A and the outer flange 144F. The lower ridge line portion 150 is a bent portion formed between the side wall portion 144A and the lower wall portion 144C. These ridge line portions (bent portions) 148 and 150 are bent at a right angle or a substantially right angle when viewed from the front-rear direction of the vehicle body and extend in the front-rear direction of the vehicle body. Further, these ridge line portions (bending portions) 148 and 150 are formed from the front end portion to the rear end portion of the reinforcing member main body 144. The reinforcing member main body 144 has the above-described ridge line portions 148 and 150 formed therein, so that the rigidity against the load in the longitudinal direction of the vehicle body is improved.

  The lid member 146 is formed in a flat plate shape whose longitudinal direction is the longitudinal direction of the vehicle body, and is superimposed on the upper side of the reinforcing member main body 144. Both ends of the lid member 146 in the vehicle width direction are coupled to the outer flange 144F and the inner flange 144G by spot welding. A front connecting portion 146A extending toward the front side of the vehicle body is formed at the front end portion of the lid member. The front connecting portion 146A is superimposed on the upper surface of the upper wall portion 38A (not shown in FIG. 28) of the rear cross member 20, and is fixed to the rear cross member 20 by bolt fastening. Accordingly, the front end portion of the reinforcing member 142 is supported by the rear cross member 20. The rear end portion of the reinforcing member 142 is connected to the lower back 16 (not shown) via a bracket (not shown), or directly fixed to the lower back 16 by means such as bolt fastening and supported by the lower back 16. .

  Further, in the reinforcing member 142, the connecting portions 144F1 and 144F2 described above are overlapped on the upper surface of the rear side member rear portion 14B (not shown) positioned on the outer side in the vehicle width direction with respect to the reinforcing members 142, and the rear side members are fastened by bolt fastening. It is fixed to the member rear part 14B. Accordingly, each reinforcing member 142 is connected to the rear side member rear portion 14 </ b> B located on the outer side in the vehicle width direction with respect to each reinforcing member 142.

  The reinforcing member 142 having the above configuration has fewer “ridge lines extending linearly in the vehicle longitudinal direction” than the reinforcing member 72 according to the second embodiment. Although it is inferior, since it can manufacture only with a metal plate, manufacture is easy.

<Supplementary explanation of the embodiment>
In the second embodiment and the third embodiment, at least a part of the front end portions of the left and right reinforcing members 72 and 142 overlaps with the left and right load receiving portions 78 in the longitudinal direction of the vehicle body. It is not a thing. In other words, at least a part of the front end portions of the left and right reinforcing members 72 and 142 may overlap with the left and right side portion main bodies 77 when viewed in the longitudinal direction of the vehicle body. In that case, the left and right load receiving portions 78 can be omitted.

  Moreover, in the said 2nd Embodiment, although the fastener 80 which fastened the lower back 16 and the rear bumper reinforcement 18 was set as the "protrusion part", it is not restricted to this. For example, you may make it the structure which fixes the components (for example, cylindrical component) which comprise a protrusion part to the lower back 16. FIG.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

DESCRIPTION OF SYMBOLS 10 Vehicle body rear structure 12 Rear floor pan 14 Rear side member 14A Front part 14B Rear part 16 Lower back 18 Rear bumper reinforcement 20 Rear cross member 22 Rear suspension member 22A Side part 24 Reinforcement member 26 Front bracket 42 Floor reinforcement member 44 Underfloor reinforcement member 46,48, 50, 52 Ridge part 50 Rear bracket 70 Car body rear structure 72 Reinforcement member 74 Front connection bracket (connection part)
76 Rear connection bracket (connection part)
77 Side part body 78 Load receiving part 80 Fastener 82 Bulk member 90, 92, 94, 96, 98, 100 Ridge part 140 Car body rear structure 142 Reinforcement member 144F1, 144F2 Connection part

Claims (5)

Left and right rear side members disposed on both sides of the rear floor pan in the vehicle width direction with the vehicle body longitudinal direction as the longitudinal direction;
Rear bumper reinforcement arranged with the vehicle body width direction as the longitudinal direction on the vehicle body rear side of each rear end portion of the left and right rear side members;
A rear suspension member attached to the front part of the left and right rear side members;
A load receiving portion projecting upward from the rear suspension member to the vehicle;
The left and right rear side members are arranged in the vehicle body width direction inside the rear part of the rear suspension member and the vehicle body rear side of the rear suspension member with the vehicle body front-rear direction as the longitudinal direction, and at least a part of each rear end part is located in the vehicle front-rear direction with respect to the rear bumper reinforcement. The left and right reinforcement members overlapped in a direction view,
A rear cross that connects the left and right rear side members in the vehicle body width direction, is interposed between the left and right reinforcing members and the load receiving portion, and partially overlaps the load receiving portion in the vehicle front-rear direction. Members,
Car body rear structure with   The vehicle body rear structure according to claim 1, wherein the load receiving portion protrudes upward from the left and right side portions of the rear suspension member attached to the front portions of the left and right rear side members.   The vehicle body rear structure according to claim 1, wherein the load receiving portion overlaps at least a part of each front end portion of the left and right reinforcing members when viewed in the vehicle longitudinal direction.   The vehicle body rear part structure according to any one of claims 1 to 3, wherein the left and right reinforcing members are disposed on a vehicle body upper side of the rear floor pan.   The vehicle body rear part structure according to any one of claims 1 to 4, wherein the left and right reinforcing members have a reinforcing member body having a closed cross section extending in a longitudinal direction of the vehicle body.