JP2019123462A - Rear part vehicle body structure of vehicle - Google Patents

Abstract

To avoid increase of the weight and efficiently improve suspension support rigidity.SOLUTION: A rear part vehicle body structure of a vehicle includes: rear suspension support parts 34 supporting rear suspension devices 90, 90 at left and right sides; a first rear cross member 35 coupling the rear suspension support parts 34, 34 at both side parts of a vehicle body; a front cross member 21 bridged between both side parts of the vehicle body in front of the first rear cross member 35; upper side frames 28, each of which is connected to the front cross member 21 and the first rear cross member 35 and provided at the outer side in a vehicle width direction; and center members 41 provided at the center side in the vehicle width direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rear vehicle body structure of a vehicle in which a cross member is provided between suspension support portions for supporting suspension members provided in rear suspension devices on both sides of a vehicle body.

  In a rear vehicle body structure provided with suspension support portions for supporting rear suspension members on both sides of the vehicle body, a structure is known in which cross members are provided between the suspension support portions in order to enhance the support rigidity of the rear suspension members ( For example, refer to Patent Document 1).

  The vehicle rear portion structure (10) as the rear vehicle body structure of Patent Document 1 extends downward from the upper cross member (24) and the upper cross member (24) which span over the left and right damper mounting portions (21, 22). The left and right leg members (25, 26) and the lower cross member (27) bridged to the lower part of the left and right leg members (25, 26) are configured annularly in a vehicle rear view.

  The load transmitted from the rear suspension to the damper mounting portion is assumed to be a load in the vertical direction of the vehicle, in the width direction of the vehicle (left-right direction), and further in the longitudinal direction of the vehicle. By forming an annular shape in the vehicle rear view, although a certain effect can be expected with respect to the suspension support rigidity with respect to the load in the vertical direction of the vehicle or the load in the vehicle width direction, it is relative to the load in the vehicle longitudinal direction. Suspension support rigidity can not be expected.

  For this reason, in order to enhance the suspension support rigidity against the load in the longitudinal direction of the vehicle, it is conceivable to provide and reinforce the reinforcing member. However, simply providing the reinforcing member leads to a weight increase and the longitudinal direction of the vehicle There is room for consideration because there is a possibility that the suspension support rigidity against the load of the vehicle can not be efficiently increased.

JP, 2009-1197, A

  The present invention has been made in view of such problems, and an object of the present invention is to provide a rear vehicle body structure of a vehicle capable of efficiently increasing the suspension support rigidity without increasing the weight.

  The rear body structure of the vehicle according to the present invention is a rear suspension supporting portion which is provided on both side portions at the rear of the vehicle body and supports suspension members provided in rear suspension devices corresponding to left and right, and rear suspensions of these vehicle side portions. A rear cross member connecting between the support portions, a front cross member bridged between vehicle body side portions in front of the rear cross member, and a front end connected to a side end of the front cross member A side member whose rear end is connected to a side end of the rear cross member, and a front end is connected to a central portion of the front cross member, and a rear end is connected to a side end of the rear cross member And a center member.

  According to the above configuration, the truss structure can be formed in a bottom view by the rear cross member, the front cross member, the side members, and the center member, so that the rear suspension support portion is connected to the vehicle body via the front truss structure. Therefore, it is possible to efficiently increase the suspension support rigidity without increasing the weight.

  As an aspect of the present invention, a tunnel frame that forms a closed cross-sectional space with the tunnel portion is provided at the top of a tunnel portion extending in the vehicle longitudinal direction at the center in the vehicle width direction ahead of the rear of the vehicle body The rear end of the tunnel frame is connected to the member, and the front end of the center member is connected to a position corresponding to the connection portion of the tunnel frame in the vehicle width direction of the front cross member.

  According to the above configuration, the rigidity of the support portion at the front end of the center member can be improved.

  As an aspect of the present invention, rear side frames extending in the longitudinal direction of the vehicle are provided on both side portions at the rear of the vehicle body, the rear side cross member is bridged adjacent to the upper surface of the rear side frame, and the rear suspension support portion is the rear side frame And the above-mentioned rear cross member at the junction.

  According to the above configuration, since the rear suspension support portion is supported at the junction of the rear side frame and the rear cross member, the support rigidity of the rear suspension can be further enhanced.

  As an aspect of the present invention, the orthogonal cross section of the rear cross member in the vehicle width direction is a vertically elongated shape long in the vehicle vertical direction with respect to the vehicle width direction, and the orthogonal cross section The division wall part which divides | segments into the upper and lower each side is formed.

  According to the above configuration, the orthogonal cross section of the rear cross member is formed into a vertically long shape and divided into upper and lower sides, whereby the suspension support rigidity by the rear cross member can be further enhanced.

  As an aspect of the present invention, the rear suspension support is an upper arm support that supports an upper arm as the suspension member.

  According to the above configuration, the load input to the upper arm support portion from the upper arm provided in the rear suspension device can be dispersed to the vehicle side through the truss structure to improve the support rigidity of the rear suspension.

  As an aspect of the present invention, a rear suspension damper supporting portion for supporting an upper end of a damper provided in the rear suspension device is formed adjacent to the rear of the upper arm supporting portion, and left and right adjacent to the rear side cross member. A second rear cross member is provided to connect the rear suspension damper supporting portions.

  According to the above configuration, the rigidity of the upper suspension support portion as well as the rigidity of the rear suspension damper support portion can be improved.

  According to the present invention, it is possible to efficiently increase the suspension support rigidity without increasing the weight.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective sectional view which shows the principal part of the rear vehicle body structure of this embodiment. FIG. 2 is a left side view showing the main part of the rear vehicle body structure of the present embodiment. FIG. 2 is a perspective sectional view showing the rear body structure of the present embodiment cut at a center position in the vehicle width direction. 1. The perspective sectional view shown corresponding to FIG. 1 cut | disconnected along the BB cross section in FIG. The perspective view which looked at the principal part of the rear body structure part of this embodiment from the bottom side. The EE sectional view taken on the line of FIG. The enlarged rear view of the vehicle body left side of the rear vehicle body structure of this embodiment. CC line expanded sectional view in FIG. 2 which showed only the vehicle body left side of the rear vehicle body structure of this embodiment. The D-D'-D'-D 'line expanded sectional view in FIG. 2 which showed only the vehicle body left side of the rear vehicle body structure of this embodiment. The GG line principal part expanded sectional view in FIG. The perspective view which looked at the principal part of the left side of the rear vehicle body structure of this embodiment from the arrow D direction in FIG. FIG. 8 is a perspective view of a rear vehicle body structure of another embodiment.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
In addition, since the rear vehicle body structure V of this embodiment is left-right symmetric, only the left side of the vehicle body is illustrated in FIGS.

  The rear vehicle body structure V of this embodiment is a so-called hatchback type vehicle having a rear opening (not shown) covered with a lift gate (not shown) so as to be openable and closable at the vehicle rear portion 1, and also extrusion molding and die casting The vehicle body structure called space frame structure which welded the frame member of the hollow closed section manufactured by this, and constituted the vehicle body frame is adopted.

As shown in FIGS. 1, 3, 4 and 6, a floor panel 4 (see FIGS. 1, 4 and 6) is provided on the floor surface of the passenger compartment 3 (see FIG. 3). A tunnel portion 5 (floor tunnel) which protrudes inward of the vehicle compartment 3 and extends in the front-rear direction of the vehicle is integrally or integrally formed at a central portion in the vehicle width direction of the vehicle. In addition, FIG. 1 is a perspective sectional view which shows the principal part of the rear vehicle body structure of this embodiment cut | disconnected along the AA cut surface in FIG.
As shown particularly in FIG. 1, FIG. 4 and FIG. 5, a tunnel side frame 6 is provided between the left and right floor panels 4 and the tunnel portion 5, respectively.

  As shown in the figure, the pair of left and right tunnel side frames 6, 6 extend in the longitudinal direction of the vehicle adjacent to the vehicle width direction both outside in the tunnel portion 5, and the rear end crosses the floor rear side cross member 20 described later. (Refer to FIG. 4, FIG. 6). The pair of left and right tunnel side frames 6, 6 are each formed to have an L-shaped cross section (see FIGS. 4 and 5).

  The tunnel side frame 6 is joined to the upper surface of the flat portion of the side wall portion 5 a of the tunnel portion 5 and the floor panel 4 in the vicinity thereof on both sides of the vehicle rear portion 1 to form a closed cross-sectional space 6 s together with the floor panel 4 (See same figure).

  As shown in FIGS. 1 to 4, a tunnel frame 7 extending in the longitudinal direction of the vehicle is joined to an upper portion of the tunnel portion 5. The tunnel frame 7 constitutes a closed cross-sectional space 7s extending in the longitudinal direction of the vehicle with the upper surface of the tunnel portion 5 (see FIG. 3).

  As shown in FIGS. 1 and 4, side sills 8 are joined and fixed to both outer ends in the vehicle width direction of the floor panel 4. The side sill 8 is a vehicle body strength member provided with a closed cross-sectional space 8s extending in the front-rear direction of the vehicle.

  As shown in FIGS. 2 and 3, the roof portion 9 of the vehicle has a pair of left and right roof rails 12, 12 extending in the vehicle longitudinal direction at both side portions of the vehicle body and a vehicle width at the rear side portions of the roof rails 12, 12. A rear header 13 extending in the direction, a roof cross member 14 extending in the vehicle width direction at an intermediate portion in the front-rear direction of the roof portion 9, and a roof panel (not shown) covering the ceiling portion of the passenger compartment 3 are provided. In addition, FIG. 2 is the left side view which removed the vehicle body (exterior) of the rear vehicle body structure of embodiment, and showed the principal part.

  A rear opening (not shown) is formed at the rear of the rear header 13, and as shown in FIG. 2 and FIG. 3, the rear edge of the roof rail 12 is formed at the left and right sides of the rear opening. An opening edge pillar 15 is provided which extends rearward and downward from an end (a portion corresponding to a joint with the both ends in the vehicle width direction of the rear header 13).

  As shown in FIG. 2 and FIG. 3, the rear end of the above-mentioned side sill 8 and the longitudinal middle part of the above-mentioned roof rail 12 (the roof cross member 14 in the front-rear direction of the roof rail 12) A center pillar 16 extending in the vertical direction of the vehicle is provided between the side sill 8 and the roof rail 12 via the center pillar 16.

  As shown in FIG. 4, the above-mentioned center pillar 16 is constructed by joining and fixing the center pillar inner 16a and the center pillar outer 16b substantially throughout the vehicle up and down direction, and between the 16a and 16b in the vehicle vertical direction. It is a vehicle body strength member having an extended closed cross-sectional space 16s. However, the center pillars 16, 16 at both sides of the vehicle body are connected to the outer ends corresponding to the left and right sides of the front cross member 21 in the vehicle width direction described later (see FIG. 4). The above-mentioned closed cross-sectional space 16s is configured together with the pillar inner 16a, the center pillar outer 16b, and the rear wall 21a of the front cross member 21 (see the same figure).

  As shown in FIGS. 1 and 3, the rear end portion of the floor panel 4 extends substantially horizontally in the vehicle rear and in the vehicle width direction via the kick-up portion 17 (see FIG. 1) rising in a vertical wall shape. It is connected to the unit 18.

  As a result, as shown in FIGS. 1 and 3, the passenger compartment 3 is located at the rear of the passenger space, in which the floor panel 4 is provided with a seat (seat cushion, seat back) (not shown). A space in the luggage compartment 19 having at the bottom part thereof a luggage compartment floor portion 18 formed one step higher than the floor panel 4 is provided in communication with each other in the vehicle longitudinal direction.

  As shown in FIGS. 1 and 3 to 4, the kickup portion 17 rises to a position higher than the height of the upper surface of the tunnel frame 7, and is joined to the tunnel portion 5 at an intermediate position in the vehicle width direction. The kick-up unit 17 has a kick-up upper portion 17a corresponding to the upper portion and a kick-up lower portion 17b corresponding to the lower portion, as shown in FIGS. The lower end of the upper upper portion 17a and the upper end of the kick-up lower portion 17b are mutually connected and integrally formed.

As shown in FIG. 1 and FIGS. 4 to 6 particularly, in a portion corresponding to a corner portion on the vehicle compartment 3 side between the rear portion of the floor panel 4 and the lower portion of the kickup portion 17, it extends in the vehicle width direction. A pair of left and right floor rear side cross members 20 (so-called 2.5 cross members) are disposed, and the floor rear side cross members 20 are provided with rear end portions of the left and right side sills 8, 8 and the tunnel side frames 6, 6 Bridge to the rear end of the (see Figs. 1, 4 and 5).
Reference numeral 75 in FIG. 5 denotes a connecting bracket that connects the front end of a rear side frame 23 (see FIG. 2) described later to the rear end of the side sill 8.

FIG. 6 is a cross-sectional view taken along line E-E in FIG. 3 with the configuration of the roof portion 9 omitted.
As particularly shown in FIG. 1, FIG. 4 and FIG. 6, the floor rear cross member 20 extends in the vehicle width direction between the floor panel 4 and the lower portion (kick-up lower portion 17b) of the kick-up portion 17. The closed cross-sectional space 20s is configured.

In addition, as shown in FIGS. 1, 3, 4 and 6, the front cross member is located at the upper portion of the kick-up portion 17 (kick-up upper portion 17 a) and the corner portion corresponding to the front portion of the luggage compartment floor portion 18. The reference numeral 21 extends in the vehicle width direction, and bridges between the left and right center pillars 16, 16.
As shown in FIG. 6, the front cross member 21 is a vehicle body strength member constituting a closed cross-sectional space 21s extending in the vehicle width direction between the upper part of the kickup portion 17 and the front portion of the cargo space floor portion 18. .

  As shown in FIGS. 1, 3 and 4, the rear end of the tunnel frame 7 and the middle portion of the front cross member 21 are joined via the connection bracket 22, and the tunnel frame 7 and the front cross member 21 view in plan It is configured in a T-shape.

  As shown in FIGS. 1, 2 and 4, rear side frames 23 and 23 extending in the longitudinal direction of the vehicle are disposed on the left and right sides of the luggage compartment floor portion 18, as shown in FIGS. 8 and 9. Thus, a closed cross-sectional space 23s extending in the front-rear direction of the vehicle is formed inside the rear side frame 23.

As shown in FIGS. 1 to 4 and 10, the rear side frame 23 is integrally or integrally formed of a front inclined portion 23F and a rear horizontal portion 23R in the longitudinal direction of the vehicle. And extends rearward and horizontally, and extends rearward and horizontally toward the rear rear bumper.
The closed cross-sectional space 23s of the rear side frame 23 is formed to communicate with each other in each of the inclined portion 23F and the horizontal portion 23R.

  Specifically, as shown in FIGS. 1, 2 and 4, the inclined portion 23F of the rear side frame 23 has its front end joined to the rear end of the side sill 8 via the connection bracket 75, and It extends in a straight line toward the upper arm support 34 described later on the inner side and the upper side in the vehicle width direction, and is disposed in an inclined form in a side view of the vehicle (see FIGS. 2, 4 and 11).

The horizontal portion 23R of the rear side frame 23 is horizontal and straight from the rear end of the inclined portion 23F to a position corresponding to the rear position of the suspension device 90 from the rear end of the vehicle as shown in FIGS. It extends to Crush cans 24 are attached to the rear ends of the pair of left and right horizontal portions 23R and 23R (see FIGS. 2 and 11), and between the crush cans 24 on the left and right sides in the vehicle width direction An unillustrated bumper reinforcement is extended.
In addition, not only the bumper reinforcement but also the illustration of the crash can 24 are omitted in FIG. 1, FIG. 3, FIG. 4, FIG. 7, and FIG.

As shown in FIG. 2, FIG. 4 and FIG. 7 to FIG. 4 particularly and FIG. 4 to FIG. 10, a closed cross section member 25 extending in the vehicle longitudinal direction above the horizontal portion 23R of the rear side frame 23 They are juxtaposed so as to be adjacent to each other.
The closed cross-sectional member 25 and the horizontal portion 23R both extend in parallel in the front-rear direction of the vehicle, and are disposed adjacent to the upper and lower sides.

  A closed cross-sectional space 25s extending mainly in the longitudinal direction of the vehicle is formed inside the closed cross-section member 25 (see FIG. 4), and as shown in FIGS. A partition 26 intervenes between the closed cross-sectional space 25s and the closed cross-sectional space 23s of the horizontal portion 23R located on the lower side, and the closed cross-sectional space 25s of the closed cross-section member 25 and the horizontal portion 23R by the partition 26 , 23s are divided into upper and lower sides.

  Here, as shown in FIG. 1, FIG. 2, FIG. 4, and FIG. 8 to FIG. 11, the upper and lower sides of the vehicle are configured to constitute these outer walls outside the horizontal section 23R and the closed cross section member 25 in the vehicle width direction. It has one outer panel 27 extending in the direction. Further, as shown in FIG. 4 and FIGS. 8 to 11 particularly, in the vehicle width direction inner side of the horizontal portion 23R, the closed cross section member 25 and the rear suspension support structure 50 (see FIG. 5) described later, One inner panel 45 extending in the vertical direction of the vehicle is provided so as to constitute each inner wall of 23R, 25 and 50.

  Further, reference numeral 46 in FIGS. 1 to 4, 7, 10 and 11 indicates that the orthogonal cross section in the vehicle longitudinal direction corresponds to the cross sectional shape of the horizontal portion 23R so as to constitute the rear of the horizontal portion 23R. It is an extrusion member formed in a cylindrical shape having a rectangular cross section.

  As shown in FIG. 1, FIG. 2, FIG. 4, FIG. 10, and FIG. 11, an upper side frame 28 as a framework member extending rearward from the lower portion of the center pillar 16 is disposed above the inclined portion 23F. .

  As shown in FIG. 4, the upper side frames 28, 28 on both sides of the rear portion 1 of the vehicle body are joined at the front end to the lower portion of the center pillar 16 extending upward from the rear end of the side sill 8 corresponding to the left and right respectively. The rear end linearly extends inward in the vehicle width direction, and the rear end is connected (merged) with the front end of the closed cross-section member 25 and both outer ends of the first rear cross member 35 (see FIG. 4) described later. ing. Thus, a closed cross-sectional space 28s extending in the front-rear direction of the vehicle is formed inside the upper side frame 28, and the closed cross-sectional space 28s is continuous with the closed cross-sectional space 25s in the closed cross-section member 25. (See the same figure).

As shown in FIG. 1 to FIG. 3, FIG. 8 and FIG. 9, a rear wheel is provided between the opening edge pillars 15 and both outer end portions of the load space floor portion 18 in the vehicle width direction on both side portions of the vehicle body rear portion 1 A house inner 29 is provided.
As shown in FIGS. 2 and 3, a reinforcing member 30 is provided between the upper front edge of the rear wheel house inner 29 and the upper rear end of the center pillar 16 so as to connect them. A quarter window as a window opening is formed in a region 31 surrounded by the reinforcement member 30 and the roof rail 12.

  As shown in FIG. 1, FIG. 2, FIG. 4, FIG. 7, FIG. 9 to FIG. 11, a damper 91 (rear suspension damper) provided in the suspension device 90 is provided at the lower inside of the rear wheel house inner 29 in the vehicle width direction. A damper support portion 32 supporting the upper end portion (see FIGS. 7 and 9) is provided via a damper support reinforcing member 33.

  As shown in FIG. 9, particularly in FIG. 1, FIG. 2, FIG. 7, and FIG. 9 to FIG. 11, the damper support / reinforcement member 33 is an upper portion of the outer panel 27 forming the outer wall of the closed cross section member 25 and the horizontal portion 23R. And the lower portion of the rear wheel house inner 29 are joined, and the damper support portion 32 is provided on the upper portion of the damper support / reinforcement member 33 (a portion projecting upward from the upper end of the outer panel 27). .

  That is, the closed cross section member 25 is disposed between the horizontal portion 23R and the damper support portion 32 located above the horizontal portion 23R, and the closed cross section member 25 includes the horizontal portion 23R and the damper support portion. And 32 are connected in the vertical direction of the vehicle (see FIGS. 2, 7 and 9 to 11).

  As shown in FIGS. 1, 2, 4, 7, 8, and 10, in particular, in FIGS. 8 and 10, the position near the lower and front of the damper support 32, that is, the horizontal position of the rear side frame 23. A pivot portion 92a (see FIG. 1) on the vehicle body side of an upper arm 92 (see FIGS. 1 and 4) provided in the suspension device 90 is pivoted at the front of the portion 23R (the joint portion with the rear of the inclined portion 23F). An upper arm support 34 is provided.

  As shown in FIG. 2, FIG. 4, FIG. 7, FIG. 8, and FIG. 10, the upper arm support portion 34 includes a pair of front and rear boss-like vehicle body side attachment portions 34a and 34a, and forms the outer wall of the horizontal portion 23R. A pair of front and rear vehicle-body-side mounting portions 34a, 34a are mounted on the front of the outer panel 27 so as to project into the closed cross-sectional space 23s (see FIGS. 8 and 10).

  On the other hand, as shown in FIG. 10 and FIG. 11, the vehicle body side mounting portions 34a, 34a are held from above at the portions of the partition wall 26 corresponding to the pair of front and rear vehicle side mounting portions 34a, 34a in a vehicle side view. A pair of front and rear holding portions 26a and 26a are provided, and upper halves of the front and rear body-side mounting portions 34a and 34a are joined and fixed to the corresponding holding portions 26a and 26a of the partition 26 by welding or the like. (See FIG. 10).

  Further, as shown in FIGS. 1, 3, 4 and 6 to 10, at the rear of the cargo space floor portion 18, a first rear cross member 35 constituting the rear end of the cargo space floor portion 18 and (Refer to FIG. 1, FIG. 3, FIG. 4, FIG. 6, FIG. 8 and FIG. 10.) The second rear cross member 36 (the second rear cross member 36) 1, 3 and 6 to 10) are disposed. The first and second rear cross members 35 and 36 both extend in the vehicle width direction, and are frame members formed by extrusion molding or the like.

  As shown in FIG. 1, FIG. 3 and FIG. 6, the first rear cross member 35 is formed with an upper wall portion 35a which forms the bottom surface 19a of the loading chamber together with the loading chamber floor portion 18; It is integrally formed with the main body portion 35b (see FIGS. 3 and 6) disposed offset downward with respect to the portion 18). That is, the first rear cross member 35 has a closed cross-sectional space 35s extending in the vehicle width direction between the upper wall portion 35a and the main body portion 35b, and forms a framework of the rear end of the load chamber bottom surface 19a. It is a thing.

The left and right end portions of the first rear cross member 35 are bridged (connected) between the front portions of the closed cross-section members 25 corresponding to the left and right, respectively (see FIG. 4).
Specifically, as shown in FIGS. 4 and 8, the first rear cross member 35 has its both side portions connected (joined) from the inside in the vehicle width direction to the front portions of the closed cross section members 25 corresponding to the left and right respectively The closed cross-sectional spaces 25s and 35s of the closed cross-sectional member 25 and the first rear cross member 35 communicate (join) with each other at their connection points. On the other hand, as shown in FIG. 4, FIG. 8, FIG. 10, and FIG. 11, the upper arm support portion 34 is disposed at a portion corresponding to the connection portion of the closed cross section member 25 with the first rear cross member 35. There is. As described above, the upper arm support portion 34 is mounted from the outer panel 27 side of the vehicle width direction outer side by the holding portions 26a, 26a corresponding to the pair of front and rear boss-like vehicle body side attachment portions 34a, 34a. It is.

  As shown in FIGS. 3, 6, 8, and 10, the first rear cross member 35 has a vertically-long cross-sectional shape in a vehicle side view (a cross sectional view in the vehicle width direction), and the first rear side. A divided wall portion 35c that divides the closed cross-sectional space 35s into upper and lower sides is provided at an intermediate portion in the vertical direction of the cross member 35. The closed cross-sectional space 35s of the first rear cross member 35 is divided into an upper closed cross-sectional space 35sa and a lower closed cross-sectional space 35sb by a divided wall portion 35c extending in the vehicle width direction.

  As shown in FIGS. 1, 3, 6, 7, 9, and 10, the second rear cross member 36 is a lower wall portion 36 a located rearward of the rear end of the loading space bottom surface 19 a (see FIG. 3, FIG. 6, and FIG. 9) and a main body portion 36b protruding upward with respect to the lower wall portion 36a. The second rear cross member 36 has a closed cross-sectional space 36s extending in the vehicle width direction between the lower wall portion 36a and the main body portion 36b (see the same drawing).

Both side portions of the second rear cross member 36 are bridged (connected) between the rear portions of the closed section members 25 corresponding to the left and right sides (see FIG. 1).
Specifically, as shown in FIGS. 9 and 10, the second rear cross member 36 has its both side portions connected (joined) from the inside in the vehicle width direction to the rear portions of the closed cross section members 25 corresponding to the left and right respectively. The closed cross-sectional spaces 25s and 36s of the closed cross-sectional member 25 and the second rear cross member 36 communicate (join) with each other at their connection points. On the other hand, as shown in FIGS. 1, 2, 7, 9, and 10, the outer panel 27 on the outer side in the vehicle width direction corresponds to the connecting portion of the closed cross-section member 25 with the second rear cross member 36. The damper support portion 32 is disposed. As a result, both side portions of the second rear cross member 36 are bridged (connected) between the damper support portions 32 corresponding to the left and right sides (see the same figure).

  Here, as shown in FIG. 3, FIG. 6 and FIG. 10, a rear flange extending rearward with respect to the rear end of the main body 35 b at the rear end of the upper wall 35 a of the first rear cross member 35. A front flange 36c is formed at the front end of the lower wall portion 36a of the second rear cross member 36 while extending 35d. The front flange 36c extends forward from the front end of the main portion 36b.

  The rear flange 35d of the first rear cross member 35 and the front flange 36c of the second rear cross member 36 are joined by spot welding or the like in a state of being in contact from the upper and lower sides.

  Thus, the first and second rear cross members 35 and 36 are integrally connected in a state of being disposed adjacent to each other in a cross sectional view in the vehicle width direction (vehicle vertical direction and vehicle longitudinal direction).

  A trunk room (not shown) is formed behind and below the second rear cross member 36 of the vehicle rear portion 1. As shown in FIGS. 3 and 6, the second rear cross member 36 includes a rear flange 36d extending rearward from the rear end of the lower wall portion 36a, and the rear flange 36d is provided in the trunk room. The upper end of the front wall panel 37 constituting the front wall is joined, and on the rear surface of the front wall panel 37, a cross member 38 for reinforcement of the front wall panel 37 is disposed in the vehicle width direction.

As shown in FIG. 2, FIG. 3 and FIG. 9, on both sides of the rear portion 1 of the vehicle body, there are provided rear pillars 39 as frame members connecting the rear header 13 and the second rear cross member 36 in the vehicle vertical direction. ing.
Specifically, as shown in FIGS. 2, 3, 8 and 9, the rear pillar 39 is connected at its upper end portion to the rear header 13 extending in the vehicle width direction via the pair of left and right roof rails 12 extending in the vehicle longitudinal direction. As shown in FIGS. 1, 3, 7, 9, and 10, the lower end portion is connected to the left and right end portions of the second rear cross member 36 extending in the vehicle width direction (FIG. 1, 3, 7, 9 and 10).

  The rear pillars 39, 39 at both sides of the rear portion 1 of the vehicle support the rear wheel house inner 29 and the damper support reinforcing member 33 between the roof rail 12 corresponding to the left and right and the second rear cross member 36. It is joined from the inside in the width direction (see FIGS. 1 and 3), and forms a closed cross-sectional space 39s extending in the vehicle vertical direction inside between the rear wheel house inner 29 and the damper support reinforcing member 33 (see See Figure 9).

  The lower end portion of the rear pillar 39 and the closed cross-sectional member 25 are connected to each other by joining (connecting) both side portions of the second rear cross member 36 and the lower end portions of the rear pillars 39 corresponding to the left and right respectively. (See FIGS. 1, 3 and 9). That is, at the connection portion (connection portion) between the lower end portion of the rear pillar 39 and both side portions of the second rear cross member 36, a closed cross-sectional space 39s of the rear pillar 39 extending in the vehicle vertical direction and a closed cross section extending in the vehicle longitudinal direction The closed cross-sectional spaces 25s of the members 25 communicate with each other (see FIG. 9). That is, the above-described upper side frame 28 extending in the longitudinal direction of the vehicle, the second rear cross member 36 extending in the lateral direction of the vehicle, and the rear pillar 39 extending in the vertical direction of the vehicle are both frame members. , 39, the closed cross-section members 25 described above are configured as shown in FIGS.

  Further, as shown in FIG. 4, the front cross member 21 constituting the front end of the cargo chamber bottom surface 19a (see FIGS. 1 and 3) and the first rear cross member 35 constituting the rear end of the cargo chamber bottom surface 19a. Between the longitudinal direction of the vehicle, the upper side frames 28 and 28 as a pair of left and right side members and a pair of left and right centers disposed on the center side in the width direction than the pair of upper side frames 28 and 28 Members 41 and 41 are provided.

  The upper side frame 28 has the front end connected to the outer end (rear wall 21a) of the front cross member 21 in the vehicle width direction on both sides of the bottom surface 19a of the cargo space and the rear end is the first rear cross member It is connected to the outer end in the vehicle width direction of 35 (see FIG. 4).

  Specifically, the outer end (rear wall 21a) of the front cross member 21 in the vehicle width direction is joined to the center pillar 16 as described above, and the front end of the upper side frame 28 is the front cross member 21. It is joined to center pillar 16 via back wall part 21a (refer to the figure).

  As shown in FIG. 4, the center member 41 has its front end connected to the central portion of the front cross member 21 in the vehicle width direction at both sides on the center side in the vehicle width direction of the loading space bottom surface 19a It is connected to the outside of the central portion of the rear cross member 35 in the vehicle width direction.

  As shown in FIGS. 3 and 4, the front ends of the pair of left and right center members 41, 41 are tunnels formed with a closed cross-sectional space 7s at the top of the tunnel portion 5 in the vehicle width direction of the front cross member 21. It is connected to a position corresponding to a connecting portion connected to the rear end of the frame 7 via the connecting bracket 22.

  As shown in FIG. 1, FIG. 3, FIG. 4, and FIG. 6, the pair of upper side frames 28, 28 and the center members 41, 41 are disposed below the cargo compartment floor portion 18, and the cargo compartment floor A closed cross-sectional space 28s (see FIG. 6) and 41s extending along the longitudinal direction (stretching direction) of each member 28 and 41 is formed between itself and the portion 18.

  As a result, the bottom surface 19a of the cargo space has a substantially truss structure Tua in a plan view in a region surrounded by the front cross member 21, the upper side frame 28, the center member 41 and the first rear cross member 35 on both side portions. , Tua (see FIG. 4).

  Furthermore, the bottom surface 19a of the luggage compartment forms a substantially truss structure Tub in a plan view in a region surrounded by the pair of left and right center members 41 and 41 and the first rear cross member 35 provided at the center in the vehicle width direction. (See same figure). Thereby, the loading space bottom face 19a constitutes a plurality of substantially truss structures Tua, Tua and Tub in its entirety.

  Further, as shown in FIGS. 3, 5, 10, and 11, the rear vehicle body structure V of the present embodiment supports a part (mainly lower part) of the rear suspension device 90 on both sides of the rear portion 1 of the vehicle body. A rear suspension support structure 50 (also referred to as a “side member”) is provided on the inner side in the vehicle width direction of the rear suspension device 90 on each of the left and right sides.

  As shown in FIG. 5, FIG. 10, and FIG. 11, the rear suspension support structure 50 includes a front rear suspension support member 51 (see FIGS. 5 and 10) constituting its front side and a lower rear suspension support member constituting the lower side. A rear side rear suspension support member 53 constituting a rear side is integrally or integrally configured in a U-shape opened upward in a side view of the vehicle.

  As shown in FIGS. 5 and 10, joining flange portions 54a and 54b are provided on the upper end of the front rear suspension support member 51 and the upper end of the rear rear suspension support member 53, respectively. The front and rear joint flanges 54a and 54b are supported by the horizontal portion 23R by joining and fixing them to the lower surface 23a of the horizontal portion 23R of the rear side frame 23 (see FIGS. 5 and 8 to 10).

  As shown in FIG. 2, FIG. 5, FIG. 7, and FIG. 10, the vehicle width of the lower arm 93 (A arm) provided in the rear suspension device 90 on each side of the lower rear suspension support member 52 extending in the vehicle longitudinal direction. A lower arm support 55 pivotally supports the direction inner end 93a (see FIGS. 7 and 10).

  As shown in FIG. 10, the rear rear suspension support member 53 extending in the vertical direction of the vehicle pivots the vehicle width direction inner end 94a of the toe control link 94 (see FIG. 7) provided in the rear suspension device 90 at its lower part. A toe control link support 56 is provided. Furthermore, as shown in FIGS. 10 and 11, at the middle portion of the rear rear suspension support member 53 in the vehicle vertical direction, the ends corresponding to the left and right of the stabilizer 95 (see FIG. 2) extending in the vehicle width direction are supported. The supporting bracket 57 is attached. The illustration of the toe control link 94 is omitted except in FIGS. 2, 7 and 10, and the illustration of the stabilizer 95 is omitted in all the cases other than FIGS. Furthermore, the illustration of the support bracket 57 of the stabilizer 95 is omitted in FIGS. 4 and 5. Also, reference numeral 47 in FIGS. 3, 4 and 11 is provided below the bottom surface 19a of the cargo compartment and in front of the rear suspension support structure 50 (see FIG. 5). 5 and 10), the partition wall 26, the upper side frame 28 (see FIG. 11), and the rear side frame 23 and so on.

  Furthermore, the rear vehicle body structure V of this embodiment is configured to support the rear suspension devices 90, 90 of both side portions of the vehicle rear portion 1 by a rear sub-frame 60 described later via the rear suspension support structure 50 corresponding to the left and right. Is adopted (refer to FIG.2, FIG.3, FIG.5, FIG.6 and FIG. 10). The rear sub-frame 60 is a vehicle body component assembled from the bottom side to the vehicle body rear portion 1 via the rear suspension support structure 50.

  Specifically, the rear vehicle body structure V according to the present embodiment is a rear sub-frame as a vehicle body component after a drive train composed of gears, a drive shaft, etc., not shown, is subassembled inside the vehicle rear portion 1 from the bottom side. 60 is assembled to the bottom side of the rear portion 1 of the vehicle by retrofitting.

  As shown in FIG. 2, FIG. 3, FIG. 5, and FIG. 6, the rear sub-frame 60 includes a sub-frame main body 61 bridged between the rear suspension support structures 50, 50 on both sides of the vehicle body and the front thereof. And a subframe front portion 70 disposed on the

  The sub-frame main body portion 61 includes a front main body cross member 62, an intermediate main body cross member 63, and a rear main body cross member 64 at intervals in this order from the front to the rear. , 63s and 64s (see FIG. 3 and FIG. 6). The front main body cross member 62 and the rear main body cross member 64 constitute a front edge and a rear edge of the sub-frame main body 61, respectively.

  As shown in FIGS. 3, 5 and 6, the front side of the sub-frame main body portion 61, the front side connecting the main body cross members 62, 63 between the vehicle front and rear directions of the middle main body cross members 62, 63. The connection panel 65 is disposed, and a rear connection for connecting the main body cross members 63, 64 between the vehicle main body cross members 63, 64 in the middle and the rear of the sub-frame main body 61 is provided. A panel 66 is provided.

  In the sub-frame main body 61, the front main body cross member 62 and the rear main body cross member 64 and the lower rear suspension support members 52, 52 in the rear suspension support structures 50, 50 of the left and right side portions (See a symbol C indicated by a phantom line in FIG. 5).

  As shown in FIGS. 3, 4 and 6, the sub-frame front portion 70 is disposed below the bottom surface 19 a (the bottom floor portion 18), and as shown in FIGS. 2, 3 and 5. As shown in FIG. 5, a pair of left and right sub frame side side members 71 and 71 connecting the side sill 8 and the sub frame main body 61 corresponding to the left and right in both side portions, and the pair of floor rear side cross members As shown in FIGS. 3 and 5, a pair of left and right sub frame side center members 72 and 72 connecting the inner end of the vehicle 20 and 20 (so-called 2.5 cross members) in the vehicle width direction and the sub frame main body 61. And a front suspension cross member 73 (also referred to as "tunnel member 73") for bridging the front ends of the pair of left and right sub-frame side center members 72, 72 with each other.

  As shown in FIG. 5, the front suspension cross member 73 is disposed between the tunnel portions 5 via the subframe side center members 72 and 72 and the floor rear cross members 20 and 20 on both left and right sides, ie, tunnel side frames 6 on both left and right sides. , 6 are connected in the vehicle width direction.

Then, as shown in FIG. 1 and particularly FIG. 5 in FIGS. 3 to 6, a center cross which bridges between the left and right side sills 8, 8 by the front suspension cross member 73 and the pair of left and right floor rear side cross members 20, 20. Members 74 are configured.
The subframe side side members 71, 71 at the vehicle body both side portions have their front ends joined to the rear end of the side sill 8 on both the left and right sides (see FIG. 1, FIG. 2, FIG. 4, FIG. 5) It is joined to the outer end in the vehicle width direction of the main body cross member 62 via a connection bracket 76 (see FIGS. 3 and 5), and extends linearly inward in the vehicle width direction as it extends rearward.

  The left and right sub frame side center members 72 and 72 have the same position in the vehicle width direction as the tunnel side frames 6 corresponding to the left and right, respectively, and the front end is tunnel side frame 6 via the inner end of the floor rear cross member 20 in the vehicle width direction. Is joined to the outer end of the front body cross member 62 in the vehicle width direction via a connection bracket 76, and extends straight outward in the vehicle width direction from the rear to the rear. (See Figure 5).

  The sub frame side side member 71 has a hat shape in which the orthogonal cross section in the longitudinal direction (stretching direction) is convex upward, and has an open cross sectional space 71s opened downward, while the sub frame side center member 72 Has a closed cross-sectional space 72s extending in the longitudinal direction (stretching direction) inside (see FIGS. 3 and 5).

  As described above, as shown in FIG. 5, sub-frame front portion 70 has sub-frame side side members 71, sub-frame side center member 72, and floor rear cross member 20 in each of its two side portions, as viewed from the bottom of the vehicle. The truss structures Tda and Tda are configured. Further, as shown in the figure, the sub-frame front portion 70 is viewed from the bottom of the vehicle by the left and right sub-frame side center members 72, 72, the front suspension cross member 73 and the front body cross member 62 at the center in the vehicle width direction. Make up a truss structure Tdb.

  As shown in FIGS. 2, 3 and 5, the sub-frame front portion 70 has a flat under cover 77 in a region surrounded by the members 20, 62, 71, 72, 73 in a bottom view of the vehicle. Are disposed from the bottom side, and the aerodynamic characteristics of the bottom of the rear portion 1 of the vehicle are enhanced by the undercover 77.

Here, as described above, the rear sub-frame 60 is a vehicle body component attached to the rear portion 1 of the vehicle rear side than the drive train (not shown) from the bottom side. The attachment structure to 1 will be described.
In FIG. 5, tunnel side frames 6, 6, kick-up portions 17, 17, floor rear cross members 20, 20 (see FIG. 4), rear suspension support structures 50, 50 and connection brackets 75, 75 are all provided. Sub-frame side members 71 and 71, sub-frame side center members 72 and 72, front suspension cross member 73, under cover 77, front, middle, rear main body cross members 62 63 and 64, the front and rear connection panels 65 and 66, and the connection bracket 76 all indicate the vehicle body parts that constitute the rear sub-frame 60.

  As shown in FIGS. 2 and 3, at both outer ends of the sub-frame main body portion 61 in the vehicle width direction, a plurality of (five in the present example, left and right in this example) sub-frame side bolt insertion portions 67 are pedestals It is arranged in a shape. Sub-frame-side bolt insertion holes (not shown) are formed through the sub-frame-side bolt insertion portions 67 in the vertical direction of the vehicle.

  On the other hand, in the lower rear suspension support member 52 of the rear suspension support structure 50, at a portion corresponding to the subframe side bolt insertion portion 67 in a bottom view of the vehicle, a boss shape projecting downward from the lower portion of the lower rear suspension support member 52 The vehicle-body-side bolt mounting portion 58 is provided. A vehicle body side bolt insertion hole (not shown) communicating with the sub frame side bolt insertion hole (not shown) is formed in each of the vehicle body side bolt mounting portions 58 in the vehicle vertical direction.

  Then, when assembling the rear sub-frame 60 as a vehicle body part to the rear suspension support structure 50 provided at the rear part 1 of the vehicle, the rear sub-frame 60 is disposed on the bottom side of the rear part 1, The portion 58 and the subframe side bolt insertion portion 67 are integrally fastened and fixed by a stud bolt 59 (see FIG. 3).

  In addition, on the rear end of the side sill 8 on the vehicle body side (via the outer end of the kick-up portion 17) of the left and right side left and right side members 71 on both sides of the subframe front portion 70, the subframe side center The members 72 are joined (via the vehicle width direction inner end of the kickup portion 17) to the vehicle width direction inner ends of the floor rear cross member 20 by welding or the like, and the undercover 77 of the subframe front portion 70 The rear sub-frame 60 is assembled to the rear portion 1 of the vehicle body by spot welding or the like to the lower surface of the kick-up lower portion 17b (see FIG. 5).

  The rear vehicle body structure V of the vehicle according to the embodiment described above is provided on the vehicle body both side portions, and supports rear suspension support portions (34) for supporting suspension members (92) provided in the rear suspension devices 90 corresponding to the left and right sides. 1, 2, 4, 7, 8, and 10), a first rear cross member 35 (rear side) connecting the rear suspension supporting portions (34, 34) of these vehicle side portions The cross member 21) (see FIGS. 4, 8 and 10) and the front cross member 21 bridged between the vehicle body side portions in front of the first rear cross member 35 (FIGS. 1, 3 and 4) 6), the front end is connected to the side end of the front cross member 21 (the outer end in the vehicle width direction) and the rear end is the side end of the first rear cross member 35 (the outside in the vehicle width direction). Upper side frame connected to the 28 (side member) and (see FIG. 1, FIG. 2, FIG. 4, FIG. 10 and FIG. 11), the front end is connected to the central portion of the front cross member 21 in the vehicle width direction and And a center member 41 connected to the side end of the member 35 (outside of the central portion in the vehicle width direction) (see FIG. 4).

  According to the above configuration, the first rear cross member 35, the front cross member 21, the upper side frame 28, and the center member 41 can form the truss structures Tua, Tua, and Tub in a bottom view (see FIG. 4). By connecting the front of the upper arm support portion 34 as the suspension support portion to the vehicle body via the truss structure Tua, Tua, and Tub, it is possible to efficiently increase the suspension support rigidity without increasing the weight.

  As an aspect of the present invention, a tunnel frame 7 which forms a closed cross-sectional space 7s (see FIG. 3) between the tunnel 5 and the tunnel 5 is provided at the top of the tunnel 5 (see FIGS. 1 to 4) 21 is connected to the rear end of the tunnel frame 7 (see FIGS. 1, 3 and 4), and the front end of the center member 41 is at a position corresponding to the connecting portion of the tunnel frame 7 in the vehicle width direction of the front cross member 21. It is connected (see FIG. 4).

  According to the above configuration, the rigidity of the support portion of the front end of the center member 41 can be improved.

  As an aspect of the present invention, rear side frames 23, 23 extending in the vehicle longitudinal direction are provided on both sides of the vehicle body (see FIG. 4), and the first rear cross member 35 is adjacent to the upper surface (partition wall 26) of the rear side frame 23. The bridge is bridged (see FIG. 10), and the rear suspension support (34) is supported by the junction 40 of the rear side frame 23 and the first rear cross member 35 (see FIGS. 4, 8 and 10). .

  According to the above configuration, since the rear suspension support portion (34) is supported by the joining portion 40 of the rear side frame 23 and the first rear cross member 35, the suspension support rigidity can be further enhanced.

  As an aspect of the present invention, the orthogonal cross section of the first rear cross member 35 in the vehicle width direction is a vertically long shape that is long in the vehicle vertical direction with respect to the vehicle width direction, and the vertical middle of the first rear cross member 35 A divided wall portion 35c that divides the orthogonal cross section into upper and lower sides is formed in the portion (see FIGS. 6, 8, and 10).

  According to the above configuration, the orthogonal cross section of the first rear cross member 35 is formed in a vertically elongated shape, and divided into upper and lower sides, thereby further providing suspension support rigidity by the first rear cross member 35. It can be enhanced.

  More specifically, as described above, the orthogonal cross section of the first rear cross member 35 in the vehicle width direction is formed into a vertically long shape which is long in the vehicle vertical direction with respect to the vehicle width direction. It is possible to effectively prevent the cross section of the first rear cross member 35 from being broken due to the load in the vertical direction of the vehicle input to the first rear cross member 35 through 32.

  Moreover, in the present embodiment, the first rear cross member 35 has its main portion 35b offset downward with respect to the bottom surface 19a of the loading chamber, and the upper wall 35a of the first rear cross member 35 Since the upper wall portion 35a is formed to coincide with the height of the loading space bottom face 19a so as to form a portion, even if the vertically elongated first rear cross member 35 is disposed in the vehicle width direction It can prevent the loading space 19 from becoming narrow.

  On the other hand, by forming the dividing wall portion 35c at the middle portion in the vertical direction of the first rear cross member 35, it is possible to secure the strength against the load in the vehicle longitudinal direction while forming it into the vertically long shape.

  As an aspect of the present invention, the rear suspension support is an upper arm support 34 that supports the upper arm 92 as the suspension member (see FIGS. 1, 2, 4, 7, 8, 10).

  According to the above configuration, the load input to the upper arm support portion 34 from the upper arm 92 provided in the rear suspension device 90 is dispersed to the vehicle side through the truss structure Tua, Tua, and Tub (see FIG. 4) to support the suspension. Stiffness can be increased.

  As an aspect of the present invention, a damper support portion 32 (rear suspension damper support portion) for supporting the upper end of the damper 91 provided in the rear suspension device 90 is formed adjacent to the rear of the upper arm support portion 34 (FIG. 1, 2, 7 and 9 to 11), a second rear cross member 36 is provided adjacent to the first rear cross member 35 to connect the damper support portions 32 and 32 of both side portions of the vehicle body. 1, FIG. 3, FIG. 6, FIG. 7, FIG. 9, and FIG.

According to the above configuration, not only the rigidity of the upper arm support 34 but also the rigidity of the damper support 32 can be improved.
In particular, as described above, the truss structure Tua, Tua, Tub (see FIG. 4) is provided on the front side of the damper support portion 32 by the center member 41, the upper side frame 28, the front cross member 21 and the first rear cross member 35. By configuring, it is possible to effectively suppress the vibration in the vertical direction of the vehicle input to the damper support portion 32 by the vertical movement of the damper 91 of the rear suspension device 90, and between the damper support portions 32, 32 of the vehicle side portions. Vibrations in the vehicle width direction can be effectively suppressed by the bridged second rear cross member 36.

  Moreover, since the truss structures Tua, Tua and Tub are formed on the horizontal surface so as to form the bottom surface 19a of the load chamber, the rigidity of the upper arm support portion 34 and the rigidity of the damper support portion 32 are ensured while securing the wide load chamber 19. Can be enhanced.

The present invention is not limited to the configuration of the above-described embodiment, and can be formed in various embodiments.
Specifically, as shown in FIGS. 3 and 4, the first rear cross member 35 is configured to be bridged between the left and right upper arm support portions 34 and 34, as shown in FIGS. 1 and 3. The second rear cross member 36 is configured to be bridged between the left and right damper support portions 32 and 32 and is configured to bridge both of the rear suspension support portions. Not limited to the configuration in which both of the cross members 35 and 36 are bridged between the rear suspension support portions, at least one of the first and second rear cross members 35 and 36 may be, for example, a rear suspension support portion of a vehicle body side portion. You may employ the structure bridged to other parts.

  FIG. 12 is a perspective view showing a rear vehicle body structure VA of another embodiment in a frame structure.

  Hereinafter, the rear body structure VA of the other embodiment will be described with reference to FIG. 12, but the same reference numerals are given to the same components as the rear body structure V of the above embodiment, and the description thereof is omitted. Do.

  The rear vehicle body structure VA of the other embodiment does not have a rear cross member corresponding to the first rear cross member 35 (see FIG. 3) as shown in FIG. 12, but the second rear cross member 36 As a cross member corresponding to (see FIG. 3), a rear cross member 36A is provided which bridges the damper support portions 32, 32 in the vehicle width direction.

  A pair of left and right upper side frames 28 is provided between the front cross member 21 and the second rear cross member 36A, and the upper side frames 28 and 28 are formed in a cross shape in a vehicle width direction inside in the vehicle width direction. A pair of center members 41A and 41A are provided.

  Specifically, as shown in FIG. 12, the front end of one of the pair of center members 41A and 41A is connected to one outer end of the front cross member 21 in the vehicle width direction, and the rear end is a rear cross member It is connected to the upper side frame 28 near the other outer end in the vehicle width direction of 36A. Furthermore, the other of the pair of center members 41A and 41A has the front end connected to the other outer end in the vehicle width direction of front cross member 21, and the rear end is one in the vehicle width direction of rear cross member 36A. It is connected to the upper side frame 28 near the outer end.

  Thus, the pair of center members 41A, 41A are diagonally arranged in a region surrounded by the front cross member 21, the rear cross member 36A, and the pair of upper side frames 28, 28 in a plan view of the vehicle.

  In the present embodiment, the damper 91 moves up and down the rear suspension device 90 by a pair of center members 41A and 41A disposed diagonally in a plan view diagonally in front of the left and right damper support portions 32 and 32. The damper support portion 32 can be supported in such a manner as to effectively suppress the upward thrust of the

  Further, by the rear cross member 36A bridged between the left and right damper support portions 32, 32, it is possible to suppress the vibration in the vehicle width direction accompanying the vertical movement of the damper 91.

  Here, in the rear vehicle body structure V of the embodiment described above, as shown in FIG. 3, the first rear cross member 35 and the second rear cross member 36 are provided. In the rear vehicle body structure V of such an embodiment, although not shown, when a suspension type without the upper arm 92 such as a strut type is applied instead of the suspension device 90 with the upper arm 92, left and right The contribution of the support strength to the input load from the suspension device 90 by the first rear cross member 35 bridging the upper arm support portions 34 in the vehicle width direction is reduced.

  Therefore, the rear vehicle body structure VA of the present embodiment as shown in FIG. 12 having only the rear side cross member 36A as the rear side cross member is applied to the rear vehicle body structure having the strut type suspension device without the upper arm 92. In this case, the first rear cross member 35 can be configured without the contribution of the support strength to the input load from the suspension device 90 being reduced, so that an advantageous configuration can be achieved from the viewpoint of weight reduction of the vehicle body. .

V, VA: Rear body structure 1, 1A of the vehicle Body rear portion 7: Tunnel frame 7s: Closed cross-sectional space 8: Side sill (front side of the vehicle)
21: Front cross member 23: Rear side frame 23R: Horizontal part (both sides of the rear of the vehicle)
26 ... Partition wall (upper surface of rear side frame)
28 ... Upper side frame (side member)
32 ... Damper support (Rear suspension damper support)
34 ... Upper arm support (rear suspension support)
35 First rear cross member (rear cross member)
35c ... divided wall portion 36 ... second rear cross member (second rear cross member)
41 ... center member 40 ... joining part 90 ... rear suspension device 91 ... damper 92 ... upper arm (suspension member)

Claims (6)

A rear suspension support portion provided on both side portions at the rear of the vehicle body and supporting suspension members provided in rear suspension devices corresponding to the left and right sides,
A rear cross member connecting between the rear suspension support portions of the vehicle body both side portions;
A front cross member bridged between vehicle body side portions in front of the rear cross member;
A side member whose front end is connected to the side end of the front cross member and whose rear end is connected to the side end of the rear cross member;
And a center member having a front end connected to a central portion of the front cross member and a rear end connected to a side end of the rear cross member. A tunnel frame which forms a closed cross-sectional space with the tunnel portion is provided at the top of a tunnel portion extending in the front-rear direction of the vehicle in front of the rear of the vehicle body and in the vehicle width direction center;
A rear end of the tunnel frame is connected to the front cross member;
The rear body structure of a vehicle according to claim 1, wherein a front end of the center member is connected to a position corresponding to a connecting portion of the tunnel frame in a vehicle width direction of the front cross member. Rear side frames that extend in the longitudinal direction of the vehicle are provided on both sides of the rear of the vehicle,
The rear cross member is bridged adjacent to the upper surface of the rear side frame,
3. The rear vehicle body structure of a vehicle according to claim 1, wherein said rear suspension support portion is supported by a junction of said rear side frame and said rear cross member. The orthogonal cross section of the rear cross member in the vehicle width direction is vertically elongated in the vehicle vertical direction with respect to the vehicle width direction, and the orthogonal cross section is divided into upper and lower sides in the vertical middle of the rear cross member. 4. The rear body structure of a vehicle according to claim 3, wherein a dividing wall portion is formed. 5. The rear vehicle-body structure of a vehicle according to any one of claims 1 to 4, wherein the rear suspension support portion is an upper arm support portion for supporting an upper arm as the suspension member. A rear suspension damper supporting portion for supporting an upper end of a damper provided in the rear suspension device is formed adjacent to the rear of the upper arm supporting portion, and left and right rear suspension damper supporting portions adjacent to the rear cross member The vehicle rear body structure according to claim 5, further comprising a second rear cross member connecting the two members.

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