JP6982757B2 - Rear body structure of the vehicle - Google Patents

Description

The present invention relates to a rear body structure of a vehicle provided with a rear subframe as a rear suspension support structure that supports a portion of the rear suspension device.

In a vehicle provided with a rear subframe that supports a part of the rear suspension device at the rear of the vehicle body, the rear subframe and its surroundings are reinforced in order to increase the support rigidity of the rear suspension device, as exemplified in Patent Document 1. Is known.

The vehicle body rear structure (rear vehicle body structure) of Patent Document 1 is provided with a rear subframe supported by the rear side frames of these vehicle body side portions between the rear side frames provided on both side portions of the vehicle body, and is provided in front of the rear subframe. , It is equipped with a pair of left and right braces as reinforcing members. In these pairs of left and right braces, the front end is connected to the rear end of the side sill corresponding to each of the left and right sides, and the rear end is connected to the central region of the front side of the rear subframe in the vehicle width direction.

According to the above configuration, a large truss structure can be constructed by these pairs of left and right braces and a cross member bridging the rear ends of the side sills corresponding to the left and right sides, whereby the rear suspension at the front of the rear subframe can be configured. The support rigidity of the device is increased.

However, in the vehicle body rear structure of Patent Document 1, most of the load input from the rear suspension device to the rear subframe is distributed only to the vehicle body side (for example, the side sill) through the braces on both side portions of the vehicle body, so that the rear is used. There was room for improvement in terms of efficiently increasing the support rigidity of the suspension device.

Japanese Unexamined Patent Publication No. 2015-128982

The present invention has been made in view of such problems, and an object of the present invention is to provide a rear body structure of a vehicle in which suspension support rigidity by a rear subframe is efficiently increased.

The present invention includes a rear subframe that supports the rear suspension devices on both side portions of the vehicle body, and the rear subframe supports the rear suspension arm provided on the rear suspension device via the body side side member. A rear body structure of a vehicle including a subframe front portion connecting the subframe main body portion and the side sill in front thereof, and a cross member connecting these side sills between the left and right side sill. The subframe front portion is a subframe side center that connects the subframe side side member that connects the side sill and the subframe main body portion, the central portion of the cross member in the vehicle width direction, and the subframe main body portion. A member is provided , and a first rear rear suspension cross member and a second rear suspension cross member extending in the vehicle width direction are provided on each of the front and rear end sides of the subframe main body portion, and these first and second members are provided. The rear rear suspension cross member and the body side side members on both sides of the vehicle body are configured in a grid shape when viewed from the bottom, and the subframe main body is formed in the vehicle width direction of the first rear rear suspension cross member. It extends from the connection position of both side portions of the vehicle body with the rear end of the side member on the subframe side in the extending direction of the side member on the subframe side, and is connected at the center portion in the vehicle width direction of the second rear suspension cross member on the second rear side. It is equipped with a reinforcing member.

According to the above configuration, the truss structure can be configured in front of the subframe main body by the subframe main body, the subframe side side member, the subframe side center member, and the cross member in a bottom view. The frame main body can be connected to the vehicle body via the truss structure, and the weight can be avoided and the suspension support rigidity can be efficiently increased.

Further, according to the above configuration, by providing the reinforcing member, the reinforcing member can form a large truss structure in bottom view together with the subframe side side member and the cross member. Further, the reinforcing member, together with the body side side members of both side portions of the vehicle body, forms a plurality of truss structures in the inner region of the subframe main body portion which constitutes a grid shape when viewed from the bottom, and efficiently enhances the suspension support rigidity. be able to.

As an aspect of the present invention, the body-side cross member on the vehicle body side and the subframe on both side portions of the vehicle body, in which the cross member connects the tunnel portion at the center in the vehicle width direction and the side sill in the vehicle width direction. It is composed of a front rear suspension cross member on the rear subframe side that connects the tunnel portions in the vehicle width direction via a side center member.

According to the above configuration, by using the body side cross member of the vehicle body structure as the cross member, it is possible to reduce the weight of the rear part of the vehicle body as compared with the case where independent cross members are provided on the vehicle body side and the rear subframe side. become.

As an aspect of the present invention, the cross member bridges between the subframe side side members of both side portions of the vehicle body in the vehicle width direction.

According to the above configuration, the front rigidity of the rear subframe itself can be improved.

As an aspect of the present invention, a tunnel side frame whose rear end is connected to the cross member is provided, and the subframe side center member is connected to the cross member at the same vehicle width direction position as the rear end position of the tunnel side frame. It is a thing.

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

According to the present invention, the suspension support rigidity by the rear subframe can be efficiently increased.

The perspective sectional view which shows the main part of the rear body structure of this embodiment. The left side view which shows the main part of the rear body structure of this embodiment. FIG. 3 is a perspective sectional view showing the rear body structure of the present embodiment cut at the center position in the vehicle width direction. FIG. 2 is a perspective cross-sectional view shown corresponding to FIG. 1 cut along the BB line cut surface in FIG. 2. The perspective view which looked at the main part of the rear body structure part of this embodiment from the bottom side. FIG. 3 is a cross-sectional view of a main part of the EE line in FIG. An enlarged rear view of the left side of the vehicle body of the rear body structure of the present embodiment. FIG. 2 is an enlarged cross-sectional view taken along line CC in FIG. 2, showing only the left side of the vehicle body of the rear vehicle body structure of the present embodiment. FIG. 2 is an enlarged cross-sectional view taken along the line DD ″ -D ″ -D ″ in FIG. 2 showing only the left side of the vehicle body of the rear vehicle body structure of the present embodiment. FIG. 8 is an enlarged cross-sectional view of a main part of the GG line in FIG. A perspective view of a main part on the left side of the rear vehicle body structure of the present embodiment as viewed from the direction of arrow D in FIG. Bottom view of the rear body structure of another embodiment. Bottom view of the rear body structure of yet another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Since the rear vehicle body structure V of the present embodiment is symmetrical, only the left side of the vehicle body is shown in FIGS. 7 to 9 and 11.

The rear body structure V of the present embodiment is a so-called hatchback type vehicle having a rear opening (not shown) that can be opened and closed by a lift gate (not shown) at the rear part 1 of the car body, and is extruded or die-cast. This is a vehicle body structure called a space frame structure in which a body frame is formed by welding a hollow closed cross-section skeleton member manufactured by the above.

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), and the floor panel 4 is provided. In the central portion in the vehicle width direction, a tunnel portion 5 (floor tunnel) protruding inward of the vehicle interior 3 and extending in the front-rear direction of the vehicle is integrally or integrally formed. Note that FIG. 1 is a perspective sectional view showing a main part of the rear vehicle body structure of the present embodiment cut along the AA line cutting surface in FIG. 2.
As shown in FIGS. 1, 4, and 5, in particular, FIG. 5, tunnel side frames 6 are 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 and 6 extend to the tunnel portion 5 in the vehicle front-rear direction adjacent to both outer sides in the vehicle width direction, and the rear end thereof is the floor rear side cross member 20 described later. (See FIGS. 4 and 6). The pair of left and right tunnel side frames 6 and 6 are all formed in an L-shaped cross section (see FIGS. 4 and 5).

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

As shown in FIGS. 1 to 4, a tunnel frame 7 extending in the front-rear direction of the vehicle is joined to the upper part of the tunnel portion 5. The tunnel frame 7 constitutes a closed cross-sectional space 7s extending in the front-rear direction of the vehicle from 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 of the floor panel 4 in the vehicle width direction. The side sill 8 is a vehicle body strength member having a closed cross-sectional space 8s extending in the front-rear direction of the vehicle inside.

As shown in FIGS. 2 and 3, the roof portion 9 of the vehicle has a pair of left and right roof rails 12 and 12 extending in the front-rear direction of the vehicle on both side portions of the vehicle body and a vehicle width at the rear portions of the roof rails 12 and 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 vehicle interior 3 are provided. Note that FIG. 2 is a left side view showing a main part by removing the vehicle body (exterior) of the rear vehicle body structure of the embodiment.

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

As shown in FIGS. 2 and 3, the rear end portion of the side sill 8 and the front-rear intermediate portion of the roof rail 12 (on the front-rear roof cross member 14 of the roof rail 12) on both side portions of the vehicle body rear portion 1. A center pillar 16 extending in the vertical direction of the vehicle is provided between the center pillar 16 and the side sill 8 and the roof rail 12 are connected by the center pillar 16.

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

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

As a result, as shown in FIGS. 1 and 3, the passenger compartment 3 is located in the occupant space in which a seat (seat cushion, seat back) (not shown) is arranged on the floor panel 4, and behind the occupant space. The space in the luggage compartment 19 having the luggage compartment floor portion 18 formed one step higher than the floor panel 4 at the bottom is provided so as to communicate with each other in the front-rear direction of the vehicle.

As shown in FIGS. 1, 3 to 4, the kick-up 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. As shown in FIGS. 1 and 4 to 6, the kick-up portion 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, and these kicks are taken. The lower end of the upper part 17a of the up and the upper end of the lower part 17b of the kickup are connected to each other and formed integrally.

As shown in FIGS. 1 and 4 to 6, in particular, FIG. 6, the portion corresponding to the corner portion on the vehicle interior 3 side between the rear portion of the floor panel 4 and the lower portion of the kick-up portion 17 extends in the vehicle width direction. A pair of left and right floor rear cross members 20 (so-called 2.5 cross members) are arranged, and the floor rear cross members 20 are the rear ends of the left and right side sills 8 and 8 and the tunnel side frames 6 and 6. It bridges to the rear end (see FIGS. 1, 4, and 5).
Reference numeral 75 in FIG. 5 indicates a connecting bracket for connecting the rear end of the side sill 8 to the front end of the rear side frame 23 (see FIG. 2) described later.

FIG. 6 is a sectional view taken along line EE in FIG. 3 in which the configuration of the roof portion 9 is omitted.
As shown in FIGS. 1, 4, and 6, in particular, FIG. 6, the floor rear cross member 20 extends in the vehicle width direction between the floor panel 4 and the lower portion of the kick-up portion 17 (kick-up lower portion 17b). It constitutes a closed cross-section space 20s.

Further, as shown in FIGS. 1, 3, 4, and 6, front cross members are provided at the upper portion of the kick-up portion 17 (kick-up upper portion 17a) and the corner portion corresponding to the front portion of the luggage compartment floor portion 18. 21 extends in the vehicle width direction and bridges the left and right center pillars 16 and 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 front portion of the luggage compartment floor portion 18 and the upper portion of the kickup portion 17. ..

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

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

As shown in FIGS. 1 to 4 and 10, the rear side frame 23 is integrally or integrally formed with the front inclined portion 23F and the rear horizontal portion 23R in the vehicle front-rear direction, and is formed at the rear end of the side sill 8. The structure is such that after extending upward and backward from the rear, it extends rearward and horizontally toward the rear rear bumper rain.
The closed cross-sectional space 23s of the rear side frame 23 is formed so as to communicate with each other inside each of the inclined portion 23F and the horizontal portion 23R.

Specifically, as shown in FIGS. 1, 2, and 4, the front end of the inclined portion 23F of the rear side frame 23 is joined to the rear end of the side sill 8 via the connecting bracket 75, and the rear end to the rear end thereof. The direction extends linearly toward the upper arm support portion 34 described later inward and upward in the vehicle width direction, and is arranged in an inclined shape when viewed from the side of the vehicle (see FIGS. 2, 4, and 11).

As shown in FIGS. 2, 4, 7, and 11, the horizontal portion 23R of the rear side frame 23 is horizontal and linear from the rear end of the inclined portion 23F to the rear of the vehicle to a position corresponding to the rear position of the suspension device 90. Extends to. Crash cans 24 are attached to the rear ends of the pair of left and right horizontal portions 23R, 23R (see FIGS. 2 and 11), and between the left and right crash cans 24, 24, in the vehicle width direction. An extended bumper reinforcement (not shown) is laid down.
In addition, in FIGS. 1, 3, 4, 7, and 10, not only the bumper reinforcement but also the crash can 24 is not shown.

As shown in FIGS. 2, 4, 7 to 11, especially FIGS. 4, 8 to 10, a closed cross-section member 25 extending in the front-rear direction of the vehicle has no gap above the horizontal portion 23R of the rear side frame 23. They are arranged side by side so as to be adjacent to each other.
Both the closed cross-section member 25 and the horizontal portion 23R extend in parallel in the front-rear direction of the vehicle, and are arranged adjacent to each of the upper and lower sides.

Inside the closed cross-section member 25, a closed cross-section space 25s extending mainly in the front-rear direction of the vehicle is configured (see FIG. 4), and as shown in FIGS. 7 to 11, the closed cross-section member 25 located on the upper side thereof. A partition wall 26 is interposed between the closed cross-section space 25s and the closed cross-section space 23s of the horizontal portion 23R located on the lower side, and the partition wall 26 causes the closed cross-section members 25 and the horizontal portion 23R to have their respective closed cross-section spaces 25s. , It is divided into upper and lower sides every 23s.

Here, as shown in FIGS. 1, 2, 4, 8 to 11, the vehicle is moved up and down on the outer side of the horizontal portion 23R and the closed cross-section member 25 in the vehicle width direction so as to form each of these outer walls. It is provided with one outer panel 27 extending in the direction. Further, as shown in FIGS. 4 and 8 to 11 in particular, the horizontal portion 23R, the closed cross-section member 25, and the rear suspension support structure 50 (see FIG. 5) described later are inside each vehicle width direction. It is provided with one inner panel 45 extending in the vertical direction of the vehicle so as to form the inner walls of 23R, 25, and 50.

Further, reference numerals 46 in FIGS. 1 to 4, 7, 10, and 11 have orthogonal cross sections in the vehicle front-rear direction corresponding to the cross-sectional shape of the horizontal portion 23R so as to form the rear portion of the horizontal portion 23R. It is an extruded member formed in a cylindrical shape having a rectangular cross section.

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

As shown in FIG. 4, the upper side frames 28, 28 of both side portions of the rear portion 1 of the vehicle body are joined to the lower part of the center pillar 16 whose front ends extend upward from the rear ends of the side sills 8 corresponding to the left and right sides, and are horizontally and horizontally. It extends linearly inward in the vehicle width direction toward the rear, and the rear end is connected (merged) to 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 in the vehicle width direction. ing. As a result, a closed cross-section space 28s extending in the front-rear direction of the vehicle is configured inside the upper side frame 28, and the closed cross-section space 28s is continuous with the closed cross-section space 25s inside the closed cross-section member 25. (See the figure).

As shown in FIGS. The house inner 29 is arranged.
As shown in FIGS. 2 and 3, a reinforcing member 30 for connecting the upper part of the front edge of the rear wheel house inner 29 and the upper part of the rear end of the center pillar 16 is arranged, and the center pillar is provided. A quarter window as a window opening is formed in the region 31 surrounded by the 16, the reinforcing member 30, and the roof rail 12.

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

1, FIG. 2, FIG. 7, and FIGS. 9 to 11 in particular, as shown in FIG. 9, the damper support reinforcing member 33 is an upper portion of the outer panel 27 forming the outer walls of the closed cross-section member 25 and the horizontal portion 23R. And the lower part of the rear wheel house inner 29 are joined to each other, and the damper support portion 32 is provided on the upper part of the damper support reinforcement member 33 (the portion protruding upward from the upper end of the outer panel 27). ..

That is, a 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 is the horizontal portion 23R and the damper support portion. 32 is connected in the vertical direction of the vehicle (see FIGS. 2, 7, 9 to 11).

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

As shown in FIGS. 2, 4, 7, 8, and 10, the upper arm support portion 34 includes a pair of front and rear boss-shaped vehicle body side mounting portions 34a and 34a, and forms an 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 portion 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 FIGS. 10 and 11, these 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 body side mounting portions 34a, 34a in the vehicle side view. A pair of front and rear holding portions 26a and 26a are provided, and the upper halves of the pair of front and rear boss-shaped vehicle body side mounting portions 34a and 34a are joined and fixed to the corresponding holding portions 26a and 26a of the partition wall 26 by welding or the like, respectively. (See FIG. 10).

Further, as shown in FIGS. 1, 3, 4, 6 to 10, the rear portion of the luggage compartment floor portion 18 is provided with a first rear cross member 35 constituting the rear end of the luggage compartment floor portion 18. (See FIGS. 1, 3, 4, 6, 8, and 10), a second rear cross member 36 (see FIG. 1, FIG. 3, FIG. 4, FIG. 6, FIG. 8, and FIG. 10) adjacent to the first rear cross member 35 at a position rearward and above the rear. 1 and 3 and 6 to 10) are arranged. Both the first and second rear cross members 35 and 36 extend in the vehicle width direction and are skeleton members configured by extrusion molding or the like.

As shown in FIGS. 1, 3, and 6, the first rear cross member 35 includes an upper wall portion 35a forming the luggage compartment bottom surface 19a together with the luggage compartment floor portion 18 and the upper wall portion 35a (the luggage compartment floor). It is integrally formed with the main body portion 35b (see FIGS. 3 and 6) arranged so as to be 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 the skeleton of the rear end of the luggage compartment bottom surface 19a. It is a thing.

The left and right ends of the first rear cross member 35 are bridged (connected) between the front portions of the closed cross-section members 25 and 25 corresponding to the left and right ends (see FIG. 4).
Specifically, as shown in FIGS. 4 and 8, both side portions of the first rear cross member 35 are connected (merged) to the front portion of the closed cross-section member 25 corresponding to each of the left and right sides from the inside in the vehicle width direction. At the connecting portion with each other, the closed cross-section spaces 25s and 35s of the closed cross-section member 25 and the first rear cross-section member 35 communicate with each other (merge). On the other hand, as shown in FIGS. 4, 8, 10, and 11, the upper arm support portion 34 is arranged at a portion corresponding to a connecting 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 has a pair of front and rear boss-shaped vehicle body side mounting portions 34a, 34a attached from the outer panel 27 side on the outer side in the vehicle width direction by the holding portions 26a, 26a corresponding to each. 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 (orthogonal cross-sectional view in the vehicle width direction), and the first rear cross member 35 has a vertically long cross-sectional shape. A split wall portion 35c for dividing the closed cross-sectional space 35s into upper and lower sides is provided in the vertical intermediate portion of the cross member 35. The closed cross-section space 35s of the first rear cross member 35 is divided into an upper closed cross-section space 35sa and a lower closed cross-section space 35sb by a split 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 36a located behind the rear end of the luggage compartment bottom surface 19a (FIG. 1). 3. (see FIGS. 6 and 9) and the main body portion 36b projecting upward with respect to the lower wall portion 36a are integrally formed. 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 figure).

Both side portions of the second rear cross member 36 are bridged (connected) between the rear portions of the closed cross-section members 25 and 25 corresponding to the left and right sides (see FIG. 1).
Specifically, as shown in FIGS. 9 and 10, both side portions of the second rear cross member 36 are connected (merged) to the rear portions of the closed cross-section members 25 corresponding to the left and right sides from the inside in the vehicle width direction. At the connecting portion with each other, the closed cross-section spaces 25s and 36s of the closed cross-section member 25 and the second rear cross-section member 36 communicate with each other (merge). 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, which corresponds to the connection portion of the closed cross-section member 25 with the second rear cross member 36, is formed on the outer panel 27. The damper support portion 32 is arranged. As a result, both side portions of the second rear cross member 36 are bridged (connected) between the left and right corresponding damper support portions 32 (see the figure).

Here, as shown in FIGS. 3, 6, and 10, the rear end of the upper wall portion 35a of the first rear cross member 35 has a rear flange extending rearward from the rear end of the main body portion 35b. While 35d is formed, a front flange 36c extending forward from the front end of the main body 36b is formed at the front end of the lower wall portion 36a of the second rear cross member 36.

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 with each other from the upper and lower sides.

As a result, the first and second rear cross members 35 and 36 are integrally connected to each other in a state of being adjacent to each other in the orthogonal cross-sectional view in the vehicle width direction (vehicle vertical direction and vehicle front-rear direction).

Although not shown, a trunk room is configured behind and below the second rear cross member 36 of the vehicle body 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 a trunk chamber. The upper ends of the front wall panels 37 constituting the front wall are joined, and a cross member 38 for reinforcing the front wall panel 37 is arranged on the rear surface of the front wall panel 37 in the vehicle width direction.

As shown in FIGS. 2, 3, and 9, both side portions of the rear portion 1 of the vehicle body are provided with rear pillars 39 as skeleton members that connect the rear header 13 and the second rear cross member 36 in the vertical direction of the vehicle. ing.
Specifically, as shown in FIGS. 2, 3, 8, and 9, the rear pillar 39 is connected to the rear header 13 whose upper end extends in the vehicle width direction via a pair of left and right roof rails 12 extending in the vehicle front-rear direction. In addition, as shown in FIGS. 1, 3, 7, 9, and 10, the lower end is connected to the left and right ends of the second rear cross member 36 extending in the vehicle width direction (FIG. 1, FIG. See FIGS. 3, 7, 9, and 10).

The rear pillars 39 and 39 on both sides of the rear portion 1 of the vehicle body are provided with respect to the rear wheel house inner 29 and the damper support reinforcing member 33 between the roof rails 12 corresponding to the left and right sides 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 FIGS. 1 and 3). See FIG. 9).

By connecting (connecting) both side portions of the second rear cross member 36 and the lower end portions of the rear pillar 39 corresponding to the left and right sides, the lower end portion of the rear pillar 39 and the closed cross-section member 25 are connected (merged) to each other. ) (See FIGS. 1, 3, and 9). That is, at the joint portion (connecting portion) between the lower end portion of the rear pillar 39 and both side portions of the second rear cross member 36, the closed cross-section space 39s of the rear pillar 39 extending in the vertical direction of the vehicle and the closed cross section extending in the front-rear direction of the vehicle. The member 25 communicates with the closed cross-section space 25s (see FIG. 9). That is, the above-mentioned upper side frame 28 extending in the vehicle front-rear direction, the second rear cross member 36 extending in the vehicle width direction, and the rear pillar 39 extending in the vehicle vertical direction are all skeleton members, and these skeleton members 28, 36. In the merging portion 40 where, 39 meet, the above-mentioned closed cross-section member 25 is configured as shown in FIGS. 2, 4, and 9.

Further, as shown in FIG. 4, the front cross member 21 constituting the front end of the luggage compartment bottom surface 19a (see FIGS. 1 and 3) and the first rear cross member 35 constituting the rear end of the luggage compartment bottom surface 19a Between the vehicle front-rear direction, the above-mentioned upper side frames 28, 28 as a pair of left and right side members, and a pair of left and right centers arranged on the center side in the width direction of the pair of left and right upper side frames 28, 28. It has members 41 and 41.

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

Specifically, the outer end portion (rear wall portion 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 the center pillar 16 via the rear wall portion 21a (see the figure).

As shown in FIG. 4, the front end of the center member 41 is connected to the central portion of the front cross member 21 in the vehicle width direction on both sides of the luggage compartment bottom surface 19a on the vehicle width direction center side, and the rear end is the first. The rear cross member 35 is connected to the outside of the central portion 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 and 41 are formed by having a closed cross-sectional space 7s at the upper part of the tunnel portion 5 in the vehicle width direction of the front cross member 21. It is connected to the rear end of the frame 7 at a position corresponding to the connecting portion connected via the connecting bracket 22.

As shown in FIGS. 1, 3, 4, and 6, the pair of left and right upper side frames 28, 28 and the center members 41, 41 are arranged below the luggage compartment floor portion 18, and the luggage compartment floor. A closed cross-sectional space 28s (see FIG. 6) and 41s extending along the longitudinal direction (stretching direction) of the members 28 and 41 are configured between the member 18 and the portion 18.

As a result, the bottom surface 19a of the luggage compartment has a substantially truss structure Tua in a plan view in the area 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 thereof. , Tua (see FIG. 4).

Further, the luggage compartment bottom surface 19a constitutes a substantially truss structure Tub in a plan view in a region surrounded by a pair of left and right center members 41, 41 and a first rear cross member 35 provided in the central portion in the vehicle width direction. (See the figure). As a result, the luggage compartment bottom surface 19a constitutes a plurality of substantially truss structures Tua, Tua, and Tub as a whole.

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

As shown in FIGS. 5, 10 and 11, the rear suspension support structure 50 includes a front rear suspension support member 51 (see FIGS. 5 and 10) constituting the front side thereof and a lower rear suspension support member constituting the lower side thereof. The 52 and the rear rear suspension support member 53 constituting the rear side are integrally or integrally configured in a U-shape that opens upward when viewed from the side of the vehicle.

As shown in FIGS. 5 and 10, joint flange portions 54a and 54b are provided at the upper ends of the front rear suspension support member 51 and the upper ends of the rear rear suspension support member 53, respectively. The front and rear joint flange portions 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, 8 to 10).

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

As shown in FIG. 10, the rear rear suspension support member 53 extending in the vertical direction of the vehicle pivotally supports the inner end 94a of the toe control link 94 (see FIG. 7) provided in the rear suspension device 90 in the vehicle width direction below the rear suspension support member 53. A toe control link support portion 56 is provided. Further, as shown in FIGS. 10 and 11, the left and right ends of the stabilizer 95 (see FIG. 2) extending in the vehicle width direction are supported at the intermediate portion of the rear rear suspension support member 53 in the vehicle vertical direction. A support bracket 57 is attached. The toe control link 94 is omitted except for FIGS. 2, 7, and 10, and the stabilizer 95 is omitted except for FIGS. 2 and 10. Further, in FIGS. 4 and 5, the support bracket 57 of the stabilizer 95 is not shown. Further, reference numerals 47 in FIGS. 3, 4, and 11 are provided below the luggage compartment bottom surface 19a and in front of the rear suspension support structure 50 (see FIG. 5), and the front rear suspension support member 51 of the rear suspension support structure 50 (see FIG. 5). (See FIGS. 5 and 10), a partition wall 26, an upper side frame 28 (see FIG. 11), and a gusset that is joined to the rear side frame 23 and the like to reinforce them.

Further, the rear vehicle body structure V of the present embodiment has a configuration in which the rear suspension devices 90 and 90 on both side portions of the vehicle body rear portion 1 are supported by a rear subframe 60 described later via a rear suspension support structure 50 corresponding to each of the left and right sides. (See FIG. 2, FIG. 3, FIG. 5, FIG. 6, and FIG. 10). The rear subframe 60 is a vehicle body component that is assembled from the bottom surface side to the vehicle body rear portion 1 via the rear suspension support structure 50.

Specifically, in the rear vehicle body structure V of the present embodiment, a drive train composed of gears, drive shafts, etc. (not shown) is sub-assembled inside the vehicle body rear portion 1 from the bottom surface side, and then a rear subframe as a vehicle body component is used. The 60 is retrofitted to the bottom surface side of the rear portion 1 of the vehicle body.

As shown in FIGS. 2, 3, 5, and 6, the rear subframe 60 includes a subframe main body 61 bridged between the rear suspension support structures 50 and 50 on both sides of the vehicle body and the front thereof. It is provided with a subframe front portion 70 arranged in the above.

The subframe main body 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 front to rear, both of which have a closed cross-sectional space 62s extending in the vehicle width direction. , 63s, 64s (see FIGS. 3 and 6). The front main body cross member 62 and the rear main body cross member 64 form a front edge and a trailing edge of the subframe main body 61, respectively.

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

The front main body cross member 62 and the rear main body cross member 64 in the subframe main body 61, and the lower rear suspension support members 52 and 52 in the rear suspension support structures 50 and 50 on both the left and right side portions make the girder in the bottom view of the vehicle. It is configured like a symbol (see reference numeral C indicated by a virtual line in FIG. 5).

As shown in FIGS. 3, 4, and 6, the subframe front portion 70 is arranged below the luggage compartment bottom surface 19a (luggage compartment floor portion 18), and is as shown in FIGS. 2, 3, and 5. A pair of left and right subframe side side members 71 and 71 connecting the side sill 8 corresponding to the left and right sides and the subframe main body 61 on both side portions, and a pair of left and right floor rear cross members as shown in FIG. As shown in FIGS. 3 and 5, a pair of left and right subframe side center members 72 and 72 connecting the inner end portions of 20 and 20 (so-called 2.5 cross members) in the vehicle width direction and the subframe main body portion 61 are connected. A front suspension cross member 73 (also referred to as a “tunnel member 73”) that bridges the front ends of a pair of left and right subframe side center members 72, 72 is provided.

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

Then, as shown in FIGS. 1 and 3 to 6, in particular, FIG. 5, the center cloth bridging the left and right side sills 8 and 8 between the front suspension cross member 73 and the pair of left and right floor rear cross members 20 and 20. It constitutes a member 74.
The front ends of the subframe side side members 71 and 71 on both side portions of the vehicle body are joined to the rear end portions of the side sill 8 on each of the left and right sides (see FIGS. 1, 2, 4, and 5), and the rear ends are on the front side. It is joined to the outer end of the main body cross member 62 in the vehicle width direction via a connecting bracket 76 (see FIGS. 3 and 5), and extends horizontally and linearly inward in the vehicle width direction toward the rear.

The pair of left and right subframe side center members 72, 72 are located at the same vehicle width direction positions as the tunnel side frames 6 corresponding to the left and right sides, and the front end is the tunnel side frame 6 via the vehicle width inner end of the floor rear cross member 20. It is joined to the rear end, and the rear end is joined to the outer end portion of the front main body cross member 62 in the vehicle width direction via a connecting bracket 76, and extends horizontally and linearly outward in the vehicle width direction toward the rear. (See Fig. 5).

The subframe side side member 71 is configured in a hat shape in which the orthogonal cross section in the longitudinal direction (stretching direction) is convex upward, and has an opening cross section space 71s that opens downward inside, while the subframe side center member 72 is provided. Is provided with a closed cross-sectional space 72s extending in the longitudinal direction (stretching direction) inside thereof (see FIGS. 3 and 5).

As described above, as shown in FIG. 5, the subframe front portion 70 is viewed from the bottom of the vehicle by the subframe side side member 71, the subframe side center member 72, and the floor rear side cross member 20 on each of the side portions thereof. The truss structures Tda and Tda are configured. Further, as shown in the figure, the subframe front portion 70 is viewed from the bottom of the vehicle by the left and right subframe side center members 72, 72, the front suspension cross member 73, and the front main body cross member 62 at the center in the vehicle width direction. Consists of a substantially truss structure Tdb.

Further, as shown in FIGS. 2, 3, and 5, the subframe front portion 70 has a flat plate-shaped undercover 77 in a region surrounded by the above members 20, 62, 71, 72, and 73 when viewed from the bottom of the vehicle. Is arranged from the bottom surface side, and the undercover 77 enhances the aerodynamic characteristics of the bottom surface of the rear portion 1 of the vehicle body.

Here, as described above, the rear subframe 60 is a vehicle body component that is retrofitted to the vehicle body rear portion 1 from the bottom surface side of the rear subframe 60 from a drive train (not shown), but subsequently, the vehicle body rear portion of the rear subframe 60. The attachment structure to 1 will be described.
In FIG. 5, the tunnel side frames 6, 6, the kick-up portions 17, 17, the floor rear cross members 20, 20 (see FIG. 4), the rear suspension support structures 50, 50, and the connecting brackets 75, 75 are all included. While showing the components on the vehicle body side, the subframe side side members 71, 71, the subframe side center members 72, 72, the front suspension cross member 73, the undercover 77, the front side, the middle, and the rear side main body cross members 62. , 63, 64, front and rear connecting panels 65 and 66, and connecting bracket 76 all indicate vehicle body parts constituting the rear subframe 60.

As shown in FIGS. 2 and 3, at both outer ends of the subframe main body 61 in the vehicle width direction, a plurality of subframe side bolt insertion portions 67 (five each on the left and right in this example) are pedestals in the front-rear direction thereof. It is arranged in a shape. Subframe-side bolt insertion holes 67 (not shown) are formed through the subframe-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, the portion corresponding to the subframe side bolt insertion portion 67 when viewed from the bottom of the vehicle has a boss shape protruding downward from the lower portion of the lower rear suspension support member 52. The vehicle body side bolt mounting portion 58 is provided. Each of these vehicle body side bolt mounting portions 58 is formed with a vehicle body side bolt insertion hole (not shown) communicating with the subframe side bolt insertion hole (not shown) in the vehicle vertical direction.

When assembling the rear subframe 60 as a vehicle body component to the rear suspension support structure 50 provided in the vehicle body rear portion 1, the rear subframe 60 is arranged on the bottom surface side of the vehicle body rear portion 1 and a plurality of sets of vehicle body side bolts are attached. The portion 58 and the subframe side bolt insertion portion 67 are integrally fastened and fixed by stud bolts 59 (see FIG. 3).

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

FIG. 12 shows a bottom view of the rear body structure VA of another embodiment represented by the skeletal structure.

Hereinafter, the rear body structure VA of another embodiment (corresponding to claim 5) will be described with reference to FIG. 12, but the same components as those of the rear body structure V of the above-described embodiment are designated by the same reference numerals. The explanation thereof shall be omitted.

The rear body structure VA of another embodiment does not include the intermediate body cross member 63 and the front connecting panel 65 and the rear connecting panel 66 as shown in FIG. 5 in the subframe main body 61, while described above. Similar to the embodiment, as shown in FIG. 12, the lower rear suspension support member 52 provided in the rear suspension support structure 50 and the front main body provided in the subframe main body 61 are located in the portion corresponding to the subframe main body 61. It includes a cross member 62 and a rear main body cross member 64, and each of these members 52, 62, 64 is configured in a grid shape when viewed from the bottom of the vehicle (see CA shown by a virtual line in FIG. 12).

Further, in this example, in the subframe main body 61, a pair of left and right reinforcing members 30 for connecting the main body cross members 62 and 64 on the front and rear sides between the front main body cross member 62 and the rear main body cross member 64 are connected. , 30 are provided.

The front ends of the pair of left and right reinforcing members 30, 30 correspond to the outer ends of the front main body cross member 62 in the vehicle width direction, specifically, the positions corresponding to the connection positions with the rear ends of the subframe side side members 71 corresponding to the left and right respectively. From the position corresponding to the connection position with the subframe side side member 71, the subframe side side member 71 extends inward in the vehicle width direction in the extending direction of the subframe side side member 71.

The rear ends of the pair of left and right reinforcing members 30, 30 are connected at the central portion in the vehicle width direction of the rear main body cross member 64.

That is, the subframe side side members 71 and the reinforcing members 30 on the left and right sides of both side portions of the vehicle body provide members that extend substantially continuously inward in the vehicle width direction toward the rear when viewed from the bottom of the vehicle in the entire rear subframe 60. It is composed.

According to the above configuration, by providing the subframe main body 61 with the reinforcing members 30 and 30, the rear sub is viewed from the bottom together with the subframe side side members 71 and 71, the center cross member 74A described later, and the rear main body cross member 64. A large truss structure Tdc can be formed over the entire frame 60 (see FIG. 12).

Further, by providing the reinforcing members 30 and 30 on the subframe main body 61, the girders are viewed from the bottom together with the lower rear suspension support members 52 and 52 (body side side members) of the rear suspension support structures 50 and 50 on both sides of the vehicle body. A plurality of truss structures can be formed together with the front main body cross member 62 and the rear main body cross member 64 in the inner region of the subframe main body 61 forming the shape (inner region surrounded by the virtual line CA in FIG. 12). .. Therefore, by providing the reinforcing member 30 in the subframe main body 61, the suspension support rigidity can be efficiently increased.

Further, as shown in FIG. 12, the rear body structure VA of the other embodiment described above is integrally or integrally formed between the rear ends of the left and right side sills 8 and 8 in the vehicle width direction, in other words, a vehicle. A center cross member 74A formed continuously in a straight line in the width direction is provided.

That is, the center cross member 74A provided in the rear vehicle body structure VA of another embodiment includes a pair of left and right floor rear cross members 20, 20 and a front suspension cross member 73, as in the center cross member 74 shown in FIG. As shown in FIG. 12, a skeleton member that is integrally or integrally formed over the entire width of the vehicle is adopted instead of indirectly connecting the other members in the vehicle width direction.

Further, in the vehicle body side portion, the outer end of the center cross member 74A in the vehicle width direction is joined to the rear end of the side sill 8 and the front end of the subframe side side member 71, and only between the side sill 8 and 8 on the left and right sides. Instead, it is configured to bridge between the subframe side side members 71 and 71 in the vehicle width direction (see FIG. 12).

According to the above configuration, the center cross member 74A can improve its own rigidity by being integrally or integrally formed in the vehicle width direction, and in addition, the center cross member 74A is formed on the subframe side side members 71, 71. By constructing a bridge between them in the vehicle width direction, the front rigidity of the rear subframe 60 on both side portions of the vehicle body can be improved.

As shown in FIGS. 5 and 12, the rear vehicle body structures V and VA of the vehicle of the above-described embodiment include a rear subframe 60 that supports the rear suspension devices 90 and 90 on both side portions of the vehicle body, and the rear subframe is provided. Reference numeral 60 denotes a subframe main body 61 that supports the lower arm 93 (rear suspension arm) provided in the rear suspension device 90 via the rear suspension support structure 50 (body side side member), the subframe main body 61, and the front of the subframe main body 61. A subframe front portion 70 for connecting the side sill 8 and a center cross member 74,74A (cross member) for connecting the side sill 8 and 8 are provided between the left and right side sill 8 and 8, and the subframe front portion is provided. Reference numeral 70 denotes a subframe side side member 71 that connects the side sill 8 and the subframe main body 61, and a subframe side center that connects the central portion of the center cross members 74 and 74A in the vehicle width direction and the subframe main body 61. It is provided with a member 72.

According to the above configuration, in front of the subframe main body 61, the subframe main body 61, the subframe side side member 71, the subframe side center member 72, and the center cross members 74, 74A have a substantially truss structure in terms of bottom view. Since Tda, Tda, and Tdb can be configured (see FIGS. 5 and 12), the subframe main body 61 is connected to the side sill 8 as a rigid member on the vehicle body side and the cross member on the rear side of the floor via the truss structures Tda, Tda, and Tdb. It can be connected to the 20 and can efficiently increase the suspension support rigidity while avoiding an increase in weight.

As an aspect of the present invention, after the floor provided on the vehicle body side, the center cross member 74 connects between the tunnel portion 5 and the side sill 8 having the center in the vehicle width direction on the left and right sides of both side portions of the vehicle body in the vehicle width direction. Front suspension cross member 73 provided on the rear subframe 60 side that connects the side cross member 20 (body side cross member) and the tunnel portion 5 via the subframe side center members 72 and 72 on both the left and right sides in the vehicle width direction. It is composed of (front rear suspension cross member) (see FIG. 5).

According to the above configuration, as the center cross member 74, a cross member that bridges between the side sills 8 and 8 by using the floor rear side cross member 20 provided in the vehicle body rear portion 1 as a part thereof is provided as a vehicle body side and a rear sub. The weight of the rear portion 1 of the vehicle body can be reduced as compared with the case where the frame 60 side is provided independently.

As an aspect of the present invention, the rear end includes a tunnel side frame 6 connected to a center cross member 74 (particularly the floor rear cross member 20 in FIG. 5) and 74A, and the subframe side center member 72 is a tunnel side frame 6. It is connected to the center cross members 74 and 74A at the same position in the vehicle width direction as above (see FIGS. 5 and 12).

According to the above configuration, the rigidity of the support portion at the front end of the center member 72 on the subframe side can be improved.

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 has a configuration in which the left and right upper arm support portions 34 and 34 are bridged, and 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, 32, and both are configured to be bridged between the rear suspension support portions, but the first and second rear sides are bridged. Not limited to the configuration in which both 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 is, for example, the rear suspension support portion of the vehicle body side portion. A configuration that bridges to a part other than the above may be adopted.

Further, FIG. 13 shows a pair of left and right subframe side side members 71, 71 provided in the rear subframe 60 and the floor rear side on the rear portion 1B side of the vehicle body in the rear body structure V of the vehicle of the above-described embodiment shown in FIG. The bottom view of the rear body structure VB of still another embodiment (corresponding to claim 6) configured without the cross member 20 is shown.

Specifically, the subframe front portion 70 provided in the rear vehicle body structure VB is composed of a pair of left and right subframe side center members 72 and 72 and a front side suspension cross member 73 (tunnel member) (see FIG. 13). The subframe side center members 72 and 72 on both sides are connected to the rear ends of the tunnel side frame 6 whose front ends correspond to each other on the left and right sides. Further, the rear subframe 60 is composed of a front main body cross member 62, a front suspension cross member 73, and a pair of left and right subframe side center members 72, 72 to form a bottom view substantially truss structure Tde (see FIG. 13).

Further, the subframe side center members 72 and 72 of both side portions of the vehicle body are connected to the rear end positions of the tunnel side frame 6 corresponding to the left and right sides of the tunnel portion 5.

The front suspension cross member 73 is connected to the subframe side center member 72 at the same position in the vehicle width direction as the tunnel side frame 6 corresponding to each of the left and right sides.

As a result, the load input from the lower arm 93 of the suspension device 90 to the lower arm support portion 55 is transmitted to the subframe main body portion 61 of the rear subframe 60 via the rear suspension support structure 50, and further, the subframe main body portion. It can be efficiently transmitted from 61 to the tunnel side frame 6 on the vehicle body side corresponding to each of the left and right via the pair of left and right subframe side center members 72 and 72.

Therefore, the load transmitted from the rear suspension device 90 to the rear subframe 60 can be efficiently transmitted to the tunnel side frame 6 on the vehicle body side via the subframe side center member 72, avoiding an increase in weight and suspension support rigidity. Can be efficiently increased.

V, VA, VB ... Vehicle rear body structure 5 ... Tunnel part 6 ... Tunnel side frame 8 ... Side sill 20 ... Floor rear side cross member (body side cross member)
30 ... Reinforcing member 50 ... Rear suspension support structure (body side side member)
61 ... Subframe main body 60 ... Rear subframe 62 ... Front main body cross member (first rear rear suspension cross member)
64 ... Rear body cross member (second rear rear suspension cross member)
70 ... Subframe front part 71 ... Subframe side side member 72 ... Subframe side center member 73 ... Front suspension cross member (front rear suspension cross member)
74 ... Center cross member (cross member)
90 ... Rear suspension device 93 ... Lower arm (rear suspension arm)

Claims (4)

The rear subframe is provided with a rear subframe that supports the rear suspension devices on both sides of the vehicle body, and the rear subframe includes a subframe main body that supports the rear suspension arm provided on the rear suspension device via body side side members and the sub. It is a rear body structure of a vehicle provided with a subframe front part that connects the frame body part and the side sill in front of the frame body part.
A cross member that connects these side sills is provided between the left and right side sills.
The subframe front portion is a subframe side center that connects the subframe side side member that connects the side sill and the subframe main body portion, the central portion of the cross member in the vehicle width direction, and the subframe main body portion. With members ,
A first rear rear suspension cross member and a second rear suspension cross member extending in the vehicle width direction are provided on each of the front and rear ends of the subframe main body.
These first and second rear rear suspension cross members and the body side side members on both sides of the vehicle body are configured in a grid shape when viewed from the bottom.
The subframe main body is in the extending direction of the subframe side side member from the connection position of both side portions of the vehicle body with the rear end of the subframe side side member in the vehicle width direction of the first rear suspension cross member. A rear body structure of a vehicle having a reinforcing member that extends and is connected at the center of the second rear suspension cross member in the vehicle width direction. The cross member connects the tunnel portion in the center of the vehicle width direction and the side sill in the vehicle width direction via the body side cross member on the vehicle body side and the subframe side center member on both side portions of the vehicle body. The rear body structure of a vehicle according to claim 1, which is composed of a front rear suspension cross member on the rear subframe side that connects the tunnel portions in the vehicle width direction. The rear vehicle body structure of a vehicle according to claim 1, wherein the cross member bridges between the subframe side side members of both side portions of the vehicle body in the vehicle width direction. It has a tunnel side frame whose rear end is connected to the above cross member.
The rear body structure of a vehicle according to any one of claims 1 to 3, wherein the subframe side center member is connected to the cross member at the same vehicle width direction position as the rear end position of the tunnel side frame .

Images