JP4525245B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear body structure of a vehicle having a rear cross member installed between a pair of left and right rear side frames, and more particularly to a rear body structure of a vehicle in which a damper member of a rear suspension is supported by the rear cross member.

  The load input to the tire according to the road surface condition or the like is transmitted to the vehicle body via the suspension, particularly the damper member. Various structures for supporting the suspension with respect to the vehicle body have been proposed.

  For example, Patent Document 1 includes a pair of left and right rear side frames disposed along the front-rear direction of the vehicle body, and a rear cross member installed between the rear side frames. There is disclosed a rear vehicle body structure in which both end portions are formed in a bifurcated shape, and an upper end portion of a suspension damper member is pivotally supported so as to straddle each crotch portion.

According to the rear vehicle body structure disclosed in Patent Document 1, both end portions of the rear cross member are formed in a bifurcated shape, and each upper crotch portion is joined to the rear side frame, and the upper end of the damper member straddles each crotch portion. Since the portion is pivotally supported, the rigidity between the rear side frame and the rear cross member can be improved, the support rigidity of the damper member can be improved, and the rear suspension including the damper member can be mounted on the rear floor. There is an advantage that it can be stored under the panel and the luggage compartment can be used efficiently.
JP 2003-48568 A

  By the way, the damper member of the suspension has a damping force set according to the running performance, the vehicle type, etc. For example, in a high output, high horsepower automobile, the damping force tends to be set higher. Thus, when the damping force is set high, the load input to the vehicle body via the damper member tends to increase.

  Therefore, in an automobile having a large load input to the vehicle body via the damper member as described above, it is desired to further improve the rigidity of the vehicle body structure for supporting the damper member.

  The present invention has been made in view of the above circumstances, and efficiently transmits the load input to the vehicle body via the damper member, thereby avoiding the local input load from acting on the rigidity of the rear vehicle body. An object of the present invention is to provide a rear vehicle body structure that can improve the vehicle.

In order to achieve the above object, a rear body structure of an automobile according to the present invention is constructed between a pair of left and right rear side frames disposed along the front-rear direction of the vehicle body on the lower side of a rear floor panel, and between the rear side frames. And a rear cross member. A rear vehicle body structure in which a damper member of a rear suspension is supported by the rear cross member extends in the vehicle height direction along the vehicle body side wall and extends along the vehicle width direction along with the vehicle body side wall. A connecting member that forms a closed section with respect to the longitudinal section, and both ends of the connecting member that extend along the vehicle width direction are joined to the vehicle body side wall via the connecting member, and at least the rear cross member is sandwiched by the rear floor panel. a reinforcing cross member is disposed in a state facing the left and right end portions, said damper portion in the reinforcing cross members The site and the connecting member corresponding to the supporting position is characterized in further comprising a gusset member connecting muscle交状.

According to the present invention, the reinforcing cross member is disposed so as to face at least the left and right end portions of the rear cross member with the rear floor panel interposed therebetween, so that the load input via the damper member acts on the rear cross member. Then, it is inputted from the rear cross member to the rear side frame and from the rear cross member to the reinforcing cross member via the rear floor panel. Moreover, since both ends of the reinforcing cross member are joined not to the rear side frame but to the side wall of the vehicle body, the input load is also transmitted to the side wall of the vehicle body. For this reason, the load input to the rear cross member can be efficiently distributed not only to the rear side frame but also to the reinforcing cross member and thus to the side wall of the vehicle body, thereby avoiding the load from acting locally on the rear cross member. Accordingly, the rigidity of the rear vehicle body including the rear cross member to which the damper member is attached can be greatly improved. In particular, when the damper member is tilted in the vehicle width direction, a load is also applied in the vehicle width direction, but a reinforcing member configured as a cross member extending in the vehicle width direction ( The strength against the load can be improved by the reinforcing cross member), whereby the structure of the rear portion of the vehicle body can be reinforced.

Further, the reinforcing cross member extends in the vehicle height direction along the side wall of the vehicle body, and forms a closed cross section with respect to the longitudinal cross section along the vehicle width direction together with the side wall of the vehicle body, for example, a vehicle body such as a rear pillar. Since it is connected to the side wall, the load input to the reinforcing cross member can be distributed and transmitted to the side wall of the vehicle body, and a closed cross section is formed by the side wall of the vehicle body and the connecting member, etc. The rigidity of the side wall can be improved, and the rigidity of the rear vehicle body including the cab side can be further increased.

Furthermore, since the gusset member for connecting the connecting member and the reinforcing cross member in a bracing manner is provided, the load input to the reinforcing cross member can be distributed and transmitted to the connecting member through the gusset member, This can further increase the rigidity of the rear vehicle body.

  Further, the reinforcing cross member is disposed to face both left and right end portions of the rear cross member, whereby the reinforcing cross member is disposed to face both end portions of the rear cross member on which the damper member of the suspension is supported. Therefore, the load input to the rear cross member can be immediately transmitted to the reinforcing cross member, and the rigidity of the rear vehicle body on which the damper member is supported can be further increased.

The specific structure of the rear cross member and the specific mounting structure of the damper member to the rear cross member are not particularly limited, and the damper member is appropriately attached to one cross member extending linearly in the vehicle width direction. it may be a thing such as, for example, the rear cross member includes a main cross member extending linearly along the vehicle width direction, and branch members formed by branching respectively from the left and right ends of the main cross member Preferably, the damper member is pivotally supported across the main cross member and the branch member, and in this case, the reinforcing cross member is disposed so as to face the branch member across the rear floor panel. (Claim 2 ).

  That is, since the rear cross member has the main cross member extending linearly, the strength required as the cross member can be secured, and the rear side frame of the rear cross member can be secured by the branch member branched from the main cross member. The attachment strength with respect to can be improved. Moreover, since the damper member is pivotally supported across the main cross member and the branch member, the damper member can be reliably and stably supported with a simple structure. Here, the branch member branching from the main cross member is slightly inferior in strength to the main cross member formed to extend substantially straight in the vehicle width direction, but the reinforcing cross member is arranged to face this branch member. Therefore, it is possible to reduce the load load acting on the branch member, thereby reducing the difference in strength between the main cross member and the branch member, thereby improving the rigidity of the rear vehicle body. it can.

In the present invention, a rear package member is provided above the reinforcing cross member, and both ends in the vehicle width direction are joined to the left and right vehicle body side walls, and the connecting member is joined to the left and right end portions of the rear package member. it is preferably (claim 3).

According to this structure, the reinforcing cross members, Ki out to construct a frame body with a pair of left and right connecting members and the rear package member, it is possible to further increase the rigidity of the rear body This ensures.

In the present invention, the specific configuration of the gusset member is not particularly limited. Front and rear side walls extending in the vertical direction, and a flat portion at one end of the gusset member is disposed along the reinforcing cross member, and a flat portion at the other end is disposed along the connecting member. It is preferable to be provided (Claim 4 ).

  With this configuration, since the front and rear side walls are provided in addition to the flat surface, the rigidity of the gusset members can be improved, and the end portions of these gusset members are arranged along the connecting member and the reinforcing cross member, respectively. As a result, the load can be transmitted smoothly.

Furthermore, for a gusset member having a flat surface portion and front and rear side wall portions, it may be formed in a U-shaped cross section, etc. on the other hand, the side wall portion after the gusset member, formed rises substantially vertically from the planar portion, preferably is bonded to the reinforcing cross member and the connecting member in these front and rear side wall portions (claim 5).

  If comprised in this way, without attaching the rigidity of a gusset member, when attaching to a vehicle body of a gusset member, it can attach only by the operation | work from the front side, and attachment workability | operativity improves.

  According to the present invention, the load input to the rear cross member from the damper member of the suspension can be transmitted not only to the rear side frame but also to the vehicle body side wall via the reinforcing cross member and the reinforcing cross member. There is an advantage that the displacement of the attachment portion of the rear cross member to which the damper member is attached can be effectively suppressed and the rigidity of the rear vehicle body can be dramatically improved.

  A preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a rear body structure of a vehicle according to the present embodiment, and FIG. 2 is a longitudinal sectional view along the front-rear direction of the vehicle body showing the structure. FIG. 3 is a front view of the structure, and FIG. 4 is a perspective view showing a mounting structure of a suspension damper member in the rear vehicle body structure. FIG. 1 shows only the right side of the rear vehicle body. Moreover, in each figure, F is an arrow which shows the front direction of a vehicle body.

  2 and 3, the rear body structure of the vehicle of this embodiment is constructed between a pair of left and right rear side frames 2 extending in the longitudinal direction of the vehicle body and between these rear side frames 2 along the vehicle width direction. The rear cross member 3, the rear suspension 4 pivotally supported by the rear cross member 3, the rear floor panel 5 joined to the rear side frame 2 and the rear cross member 3, and the vehicle width direction of the rear floor panel 5 (Left / Right direction) A pair of left and right vehicle body side walls 6 (rear pillars, quarter panels, etc.) disposed at both ends, a reinforcing cross member 7 installed between the pair of vehicle body side walls 6, and the reinforcing cross member 7 A rear package member 8 is provided above and between the vehicle body side walls 6. That is, the rear side frame 2 and the rear cross member 3 are joined to the lower surface of the rear floor panel 5, and the rear suspension 4 is accommodated below the rear floor panel 5.

  The rear side frame 2 includes a frame main body 21 having a substantially U-shaped cross section orthogonal to the longitudinal direction, and a frame flange portion 22 extending in the left-right direction from the upper edge of the opening of the frame main body 21. The cross section is formed in a substantially inverted hat shape. The upper surface of the frame flange portion 22 is overlapped with the lower surface of the rear floor panel 5 and is joined to the lower surface of the rear floor panel 5 by spot welding or the like, so that the frame body 21 and the rear floor panel 5 form a closed cross section.

The rear cross member 3 extends in the vehicle width direction and is formed by bifurcating both ends in the longitudinal direction. That is, the rear cross member 3 includes a main cross member 30 extending linearly along the vehicle width direction, and a branch member 31 which branches from each of the left and right ends of the main cross member 30, the branch member 31 The main cross member 30 is joined to a predetermined portion on the side surface.

  The main cross member 30 is formed so as to extend in a substantially straight line in the vehicle width direction, and a member main body 32 having a substantially U-shaped cross section, and a member flange portion 33 extending in the front-rear direction from the upper edge of the opening of the member main body 32. And the cross section is formed in a substantially inverted hat shape as a whole. Further, as shown in FIG. 5, left and right end portions (longitudinal end portions) of the member main body 32 are expanded outward to form joining flange portions 34 and 35 that are joined to the outer surface of the rear side frame 2. .

  The member flange portion 33 has its upper surface superimposed on the lower surface of the rear floor panel 5 and joined by spot welding or the like, and the member main body 32 and the rear floor panel 5 form a closed cross section. The joining flange portions 34 formed at both longitudinal ends of the member main body 32 are joined to the side wall surface of the frame main body 21 of the rear side frame 2 by spot welding or the like, while the left and right joining flange portions 35 are respectively connected to the rear side frame. The rear cross member 3 is constructed between the rear side frames 2 by being joined to the bottom wall surface of the frame body 21 by spot welding or the like.

  On the other hand, the branch member 31 branches rearward from a predetermined position at both ends in the longitudinal direction of the main cross member 30, and is formed in a substantially square shape in plan view. The branching direction is not particularly limited, and may be directed toward the front of the vehicle body. The branch member 31 includes a branch member main body 36 having a substantially U-shaped cross section orthogonal to the longitudinal direction thereof, and a branch flange portion 37 extending outward from the upper edge of the opening of the branch member main body 36. As a whole, the cross section is formed in a substantially inverted hat shape. In this embodiment, the branch member 31 is formed shallower than the main cross member 30, and therefore, the bottom surface thereof is positioned higher than the bottom surface of the main cross member 30 in the attached state. Further, as shown in FIG. 5, joint flange portions 38, 39 are formed in which the end of the branch member main body 36 on the rear side frame 2 side is expanded outward and joined to the outer surface of the rear side frame 2.

  Similarly to the member flange portion, the branch flange portion 37 is joined to the lower surface of the rear floor panel 5 by spot welding or the like, and the branch member main body 36 and the rear floor panel 5 form a closed cross section. Similarly to the joint flange portions 34 and 35, the joint flange portions 38 and 39 of the branch member main body 36 are joined to the outer surface and the outer bottom surface of the frame body 21 of the rear side frame 2 by spot welding or the like. The rigidity of the rear cross member 3 with respect to 2 is increased by increasing the mounting strength. In the present embodiment, the closed region area of the closed cross section formed by the branch member main body 36 and the rear floor panel 5 is the proximal end side joined to the rear side frame 2 from the proximal end side joined to the main cross member 30. It is formed so as to become small as appropriate.

  A damper member 40 of the rear suspension 4 is pivoted between the main cross member 30 and the branch member 31 across the members 30 and 31 via the bracket 9.

  As shown in FIG. 6, the bracket 9 includes a U-shaped cylindrical bracket body 90 that is cut out on the outer side in the vehicle width direction, and extends in a substantially horizontal direction from the lower end edge of the bracket body 90. 30 and superposed pieces 91 and 92 attached to the outer bottom surfaces of the main bodies 32 and 36 of the branch member 31. The superposed pieces 91 and 92 are bolted to the members 30 and 31. Each of the superposed pieces 91 and 92 is formed in a gate shape in cross section. In this embodiment, the superposed piece 91 is joined to the branch member 31 by bolting at two places, while the superposed piece 92 is bolted at one place. To the main cross member 30. These joints are indicated by 93 in FIG.

  In the bracket main body 90, mounting holes 90a for pivotally supporting the damper member 40 are formed in the upper portions of the opposing side walls (front and rear side walls), and the support shaft 405 of the damper member 40 is formed in the mounting hole 90a. As a result, the damper member 40 is attached to the bracket 9 (see FIG. 7).

  The rear suspension 4 is configured as a multi-link suspension in the present embodiment. That is, as shown in FIG. 1, the rear suspension 4 has a pair of left and right trailing arms 41 that are attached to the vehicle body at one end so as to be swingable in the vertical direction and provided with a wheel support member that rotatably supports the wheel at the other end. Three first to third arms 42, 43, 44 that extend in the vehicle width direction and support the trailing arm 41, an upper end portion is supported by the rear cross member 3, and a lower end portion is attached to the trailing arm 41. A damper member 40 that is supported and a suspension cross member 45 that connects a pair of left and right trailing arms 41 are provided, and the left and right rear wheels are independently suspended.

  As shown in FIGS. 1 and 2, the trailing arm 41 supports the wheel support member in a swingable manner with respect to the vehicle body, and includes an arm body 41a extending in the front-rear direction of the vehicle body, and the arm body 41a. A vehicle body mounting bush 41b that is formed at one end (front end) and supports the arm body 41a so as to be swingable in the vertical direction with respect to the side frame 2, and the other end (rear end) of the arm body 41a. Damper mounting bracket 41c to which the lower end portion of damper member 40 is formed, and arm mounting portions 41d and 41e (second arm) which are formed on the other end portion of arm body 41a and to which the first to third arms are mounted. 43 is provided, and the arm body 41a is provided with an insertion hole 41f through which the second arm 43 is inserted.

  The suspension cross member 45 forms the skeleton of the rear suspension 4 and supports the inner ends in the vehicle width direction of the first to third arms 42, 43, 44. The suspension cross member 45 is attached to a predetermined portion of the rear side frame 2 via a mount rubber.

  The damper member 40 functions as a shock absorber, that is, a shock absorber (buffer), and suppresses rebound of the suspension spring to accelerate vibration damping. In the present embodiment, the damping ratio of the damper member 40 is set to about twice the normal damping ratio. Therefore, the reaction force against the impact force input from the wheel (not shown) according to the road surface condition is relatively high. It has become big. As clearly shown in FIG. 7, the damper member 40 includes an outer cylinder 401, an inner cylinder 402 fitted into the outer cylinder 401, an upper eye 403 attached to the upper end portion of the inner cylinder 402, and an outer cylinder. A lower eye 404 attached to the lower end of 401, and upper and lower damper support shafts 405, 406 attached to the upper and lower eyes 403, 404, and a predetermined resistance as the inner cylinder 402 advances and retreats with respect to the outer cylinder 401. It is configured to be stretchable.

  The damper member 40 has an upper end attached to the rear cross member 3 via the bracket 9, and a lower end attached to the trailing arm 41. And in this attachment state, it arrange | positions in the state inclined toward the vehicle width direction inner side and the front-back direction front side of the vehicle body from the lower end toward the upper end. Specifically, the upper support shaft 405 of the damper member 40 is pivotally supported by the mounting hole 90 a of the bracket 9 that is mounted across the main cross member 30 and the branch member 31. Is pivotally supported across the main cross member 30 and the branch member 31 of the rear cross member 3. On the other hand, the lower support shaft 406 of the damper member 40 is supported by the damper mounting bracket 41c of the trailing arm 41, and shocks inputted through the wheels are buffered by the damper member 40.

  On the other hand, as clearly shown in FIGS. 3 and 8, the vehicle body side wall 6 is integrally formed with a quarter panel portion 61 a that forms a rear fender and a rear pillar portion 61 b that extends to the upper portion and supports a roof (not shown). The wheel house 60 includes a cab side outer panel 61 and a cab side inner panel 62 integrally formed with a quarter panel inner portion 62a that is an inner portion of the quarter panel portion 61a and a rear pillar inner portion 62b that is an inner portion of the rear pillar portion 61b. It is arrange | positioned above this and the closed cross-section is formed with this wheel house 60. FIG.

  A rear package member 8 is joined to the vehicle body side wall 6 at an intermediate portion of the cab side inner panel 62, and a reinforcing cross member 7 is joined to a lower end portion of the cab side inner panel 62 via a connecting member 63. ing. In addition, the specific location of the vehicle body side wall 6 to which these members 8 and 63 are joined is not particularly limited, and for example, the quarter panel inner portion 62a and the rear pillar inner portion 62b of the cab side inner panel 62 or joined across them. It may be what has been done.

  The connecting member 63 is joined to the lower wall 81 of the rear package member 8, and connects the lower wall 81 and the cab side inner panel 62, and the inner edge of the ceiling wall 630. An inner wall portion 631 that is joined and extends in the vehicle height direction, a side wall gusset portion 632 that has an upper end portion joined to the lower end portion of the inner wall portion 631 and a lower end portion joined to the rear floor panel 5, and front and rear sides of the inner wall portion 631 Front and rear side wall portions 633 extending in the vehicle height direction from the edge, and form a closed section 635 together with the rear floor panel 5, the vehicle body side wall 6, the wheel house 60, and the like. 3 and 8, reference numeral 10 denotes a mounting bracket to which the upper end portion of the first gusset member 11 disposed between the rear package member 8 and the reinforcing cross member 7 is attached, and 12 denotes a connecting member 63. This is a second gusset member disposed between the reinforcing cross member 7. These will be described later.

  Next, the rear package member 8 is formed in a rectangular tube shape extending along the vehicle width direction, and both ends thereof are joined to the vehicle body side wall 6 so that it is above the reinforcing cross member 7 and between the left and right vehicle body side walls 6. It is erected. The connecting member 63 is joined to the lower side of both ends of the rear package member 8 in the longitudinal direction so that mutual rigidity is improved.

  Specifically, as shown in FIGS. 4 and 8, the rear package member 8 includes a lower surface wall 81 and an upper surface wall 82 facing the lower surface wall 81, and a cross section orthogonal to the longitudinal direction has a deformed pentagon shape. Is formed. A bulk head (not shown) is joined to the rear package member 8 to partition the interior space of the vehicle into a cabin side and a cargo compartment side.

  By the way, in the rear suspension 4 of the present embodiment, the damper member 40 having a high damping ratio is used, so that the reaction force acting on the upper end portion of the damper member 40 is relatively high. Accordingly, since a relatively large load is also input to the rear cross member 3 supporting the upper end portion of the damper member 40, the reinforcing cross member 7 is provided with the rear floor panel to reinforce the rear cross member 3. 5, the rear cross member 3 is disposed so as to face both ends in the longitudinal direction. Needless to say, the reinforcing cross member 7 may be disposed along the vehicle width direction even when a damper member 40 having a high damping ratio is not used.

  That is, the reinforcing cross member 7 extends along the vehicle width direction, and both ends thereof are joined to the cab side inner panel 62 of the vehicle body side wall 6 via the connecting member 63. As clearly shown in FIGS. 4 and 7, the reinforcing cross member 7 includes a reinforcing member main body 70 having a substantially U-shaped cross section perpendicular to the longitudinal direction, and front and rear ends of the lower end edge of the reinforcing member main body 70. The reinforcing flange portion 71 extends in the direction, and is formed in a cross-sectional hat shape as a whole. In this embodiment, the reinforcing member main body 70 is formed to have substantially the same depth as the branch member main body 36 of the branch member 31, while the opening width along the front-rear direction of the vehicle body is the branch member. It is formed so as to be slightly wider than the main body 36.

  The lower surface of the reinforcing flange portion 72 is overlapped with the upper surface of the rear floor panel 5 and is joined to the upper surface of the rear floor panel 5 by spot welding or the like to form a closed cross section between the reinforcing member main body 70 and the rear floor panel. Yes. In the present embodiment, the closed region area of the closed section is formed larger than the closed region area of the closed section formed by the branch member 31 and the rear floor panel 5.

  Specifically, as shown in FIG. 7, the reinforcing cross member 7 is attached to the rear flange portion 71 of the reinforcing flange portion 71, and the rear branch flange portion 37 of the branch flange portion 37. It is joined to the rear floor panel 5 at a position slightly closer to the front of the vehicle body, while the front reinforcing flange portion 71 is joined to the rear floor panel 5 in a state of being substantially opposed to the front branch flange portion 37. That is, the reinforcing cross member 7 is disposed at a position where both end portions thereof face the branch member 31 (left and right end portions of the rear cross member 3), and are joined to the rear floor panel 5 in this facing state.

  The reinforcing cross member 7 is joined to the connecting member 63, specifically, to the side wall gusset portion 632 of the connecting member 63 at both ends in the longitudinal direction. This joining structure is joined by spot welding or the like with joining pieces formed by expanding both ends in the longitudinal direction of the reinforcing cross member 7 outward, and is similar to the joining structure of the rear cross member 3 to the rear side frame 2. Therefore, detailed description is omitted here.

  That is, the reinforcing cross member 7 is joined to the vehicle body side wall 6 through a closed cross-sectional area formed by the connecting member 63 and the like, thereby reinforcing the rear cross member 3 and transmitting the load transmitted from the rear cross member 3. Is escaped to the vehicle body side wall 6.

  In order to further improve the rigidity, in this rear vehicle body structure, the first gusset member 11 that connects the reinforcing cross member 7 to the rear package member 8 and the connecting member 63, the reinforcing cross member 7 and the connecting member 63, And a second gusset member 12 for connecting the two.

  That is, the first gusset member 11 is provided in a pair on the front side of the rear package member 8, and each upper end is joined to the mounting bracket 10 attached to the connecting member 63 by bolting, and each lower end is The reinforcing cross member 7 is joined to the longitudinal center of the reinforcing cross member 7 by bolting, thereby connecting the reinforcing cross member 7 and the connecting member 63, and thus the vehicle body side wall 6 and the rear package member 8 to each other. Further, the pair of left and right first gusset members 11 are disposed so as to be inclined outward toward the upper end, and are disposed in a substantially V shape as viewed from the front as a whole. Accordingly, the connecting member 63 and the rear package member 8 are supported by the first gusset members 11 in a bracing manner, and are configured to improve their rigidity, particularly torsional rigidity, and load acting on the reinforcing cross member 7. Is transmitted to the connecting member 63 and the rear package member 8.

  As shown in FIG. 7, the first gusset member 11 has a plate-like brace 11a and a lid-like brace 11b superimposed on the front surface of the plate-like brace 11a, and these braces 11a and 11b are orthogonal to the longitudinal direction. A closed cross section is formed with respect to the cross section to improve the strength.

  On the other hand, as shown in FIGS. 2 and 3, the second gusset member 12 is provided with a pair of left and right below the rear package member 8, and each upper end portion is joined to the joining bracket 13 attached to the connecting member 63 by bolting. In addition, each lower end portion is joined to the reinforcing cross member 7 by bolting, whereby the reinforcing cross member 7 and the connecting member 63, and thus the vehicle body side wall 6 (particularly the cab side inner panel 62) are connected to each other. Yes. Further, as shown in FIG. 3, the pair of left and right second gusset members 12 are provided outside the first gusset member 11 in the vehicle width direction, and are arranged in a substantially V shape in front view. Accordingly, the reinforcing cross member 7 and the connecting member 63, and thus the vehicle body side wall 6 are connected to each other in a bracing manner and are configured to improve the rigidity of each other, and a load acting on the reinforcing cross member 7 is connected to the connecting member. 63 and by extension, it can be transmitted to the vehicle body side wall 6.

  The mounting position of the second gusset member 12 will be specifically described. As shown in FIGS. 3 and 8, the upper end of the second gusset member 12 is joined to the inner wall 631 of the connecting member 63. At the same time, lower ends thereof are joined to both ends of the reinforcing cross member 7. In particular, in the present embodiment, the lower end portion of the second gusset member 12 is joined to both ends of the reinforcing cross member 7 at positions corresponding to the upper end portion of the damper member 40 in the rear suspension 4.

  A specific configuration of the second gusset member 12 will be described by taking the second gusset member 12 disposed on one side (right side) in the vehicle width direction as an example, but is disposed on the other side (left side) in the vehicle width direction. The second gusset member is similarly configured. FIG. 9 is a perspective view showing the second gusset member 12 disposed on the right side in the vehicle width direction.

  The second gusset member 12 has a flat portion 120 having a predetermined width in the front-rear direction of the vehicle body (in this embodiment, a width equivalent to the width of the reinforcing member body 70 of the reinforcing cross member 7 along the front-rear direction of the vehicle body), A front side wall portion 121 formed substantially vertically from the front end edge of the vehicle body in the plane portion 120 and a rear side wall portion 122 formed substantially vertically from the rear end edge of the vehicle body in the plane portion 120 are provided. However, as clearly shown in FIG. 7, the cross section perpendicular to the longitudinal direction is formed in a crank shape.

  The flat portion 120 of the second gusset member 12 is disposed so that one end in the longitudinal direction thereof is bent and substantially along the upper surface wall of the reinforcing cross member 7, that is, substantially overlapped with the upper surface wall. The other end is bent and disposed along the inner wall of the connecting member 63, that is, so as to be overlapped with the inner wall. , 63 are arranged so as to overlap each other. The planar portion 120 is provided with a plurality of holes 120a along the longitudinal direction thereof to reduce weight.

  The front side wall 121 has a lower end edge folded to form a reinforcing flange 121a, and the strength of the front side wall 121 is improved. Further, the front side wall 121 is provided with a bolt insertion hole 121 b through which the bolt for attaching to each member 7, 63 is inserted corresponding to the overlapping portion of the flat surface part 120. ing. In the present embodiment, one bolt insertion hole 121b for attachment to the connecting member 63 and two bolt insertion holes 121b for attachment to the reinforcing cross member 7 are provided.

  On the other hand, a bead 122a is formed in the rear side wall portion 122 along the longitudinal direction thereof, the strength thereof is improved, and the rear side wall portion 122 is attached to each member 7, 63 corresponding to the overlapping portion of the flat surface portion 120. A bolt insertion hole 122 b is provided through the rear side wall 122. As shown in FIGS. 4 and 7, the rear side wall 122 is attached to the reinforcing cross member 7 by bolting or the like via a mounting bracket 14 having a gate shape in cross section. In the present embodiment, one bolt insertion hole 122 b for attaching to the connecting member 63 and one bolt insertion hole 122 b for attaching to the reinforcing cross member 7 are provided.

  In this way, the front side wall 121 of the second gusset member 12 is formed to hang from the flat part 120, while the rear side wall 122 of the second gusset member 12 rises substantially vertically from the flat part 120. Since these are formed and joined to the reinforcing cross member 7 and the connecting member 63 by the front and rear side wall portions 121 and 122, the second gusset member 12 can be attached only by the work from the front side of the vehicle body. Will improve.

  These bolt insertion holes 121b and 122b open larger than the diameters of the bolts to be inserted, and can absorb dimensional errors.

  According to the rear vehicle body structure of the automobile, since the reinforcing cross member 7 is disposed so as to face the branch member 31 of the rear cross member 3 with the rear floor panel 5 interposed therebetween, as shown in FIG. A load (indicated by white arrows a) in the figure is applied to the rear cross member 3 (indicated by white arrows a in the figure). From the rear cross member 3, not only the rear side frame 2 but also the rear floor. The data is immediately input to the reinforcing cross member 7 through the panel 5 (in the figure, white arrows C and D). Since both ends of the reinforcing cross member 7 in the longitudinal direction are joined to the connecting member 63, and the connecting member 63 is joined to the vehicle body side wall 6, the load acting on the reinforcing cross member 7 is connected to the connecting member 63. Acting on the vehicle body side wall 6 via the connecting member 63 (white arrow in the figure). For this reason, the load input to the rear cross member 3 can be efficiently distributed not only to the rear side frame 2 but also to the reinforcing cross member 7 and thus to the vehicle body side wall 6 so that the load acts locally on the rear cross member 3. Therefore, the rigidity of the rear vehicle body including the rear cross member 3 to which the damper member 40 is attached can be greatly improved, and the displacement of the rear cross member 3 can be effectively improved. Can be suppressed.

  In particular, when the damper member 40 is provided tilted in the vehicle width direction, a load is also applied in the vehicle width direction, but the reinforcing member is configured as a cross member extending in the vehicle width direction. The strength against the load can be improved by the (reinforcing cross member 7), whereby the structure of the rear portion of the vehicle body can be reinforced strongly.

  In addition, since the second gusset member 12 is provided between the reinforcing cross member 7 and the connecting member 63 in a bracing manner, the load acting on the reinforcing cross member 7 is also distributed to the second gusset member 12. It acts on the connecting member 63 through the second gusset member 12 (in the figure, the white arrow key). Here, since the connecting member 63 forms a closed section together with the wheel house 60 and the like, the rigidity thereof is high. Therefore, the input load can be transmitted efficiently and the rigidity of the rear vehicle body is improved. Is done. And this load is also distributed and transmitted to the vehicle body side wall 6 etc. similarly to the above.

  Further, the load D acting on the reinforcing cross member 7 also acts on the first gusset member 11 (indicated by the white arrow in the figure), and this load is distributed and transmitted to the connecting member 63, the rear package member 8 and the like. The

  In other words, according to this rear vehicle body structure, the load input from the damper member 40 of the rear suspension 4 to the rear cross member 3 can be distributed and transmitted to each part of the vehicle rear portion, and the rear member to which the damper member 40 is attached. The displacement of the mounting portion of the cross member 3 can be effectively suppressed, and the rigidity of the rear vehicle body can be dramatically improved.

  Here, in FIG. 10, the action direction of the load is simply described based on the load input from the damper member 40 at one end in the vehicle width direction, but the actual action direction is the damper member 40 at both ends in the vehicle width direction. Therefore, it is acting in a complicated manner due to the fact that the load is acting.

  In addition, the specific structure of the vehicle body rear part structure of this invention is not limited to the said embodiment, A various change is possible. For example, it can be changed as follows.

  (1) In the above embodiment, the reinforcing cross member 7 whose cross-sectional shape is formed in a substantially hat shape is used. However, the specific shape such as the cross-sectional shape is not particularly limited. The well-known shape may be adopted.

  (2) In the above embodiment, the reinforcing cross member 7 is joined to the side wall of the vehicle body via the connecting member 63. However, the side wall 6 of the vehicle body 6 is formed by bending both ends of the reinforcing cross member 7 or the like. Needless to say, it may be bonded directly to the substrate.

  (3) In the above embodiment, the second gusset member 12 having a substantially crank-shaped cross section is used. However, the specific shape of the second gusset member 12 is not particularly limited. For example, a tubular gusset member is used. Alternatively, a second gusset member having a known shape in cross section, such as a gusset member having a U shape in cross section or an H shape in cross section, may be used.

  (4) Although the multi-link type rear suspension is used in the above embodiment, it goes without saying that the present invention can also be applied to other suspensions.

It is a top view which shows the rear part vehicle body structure which concerns on this embodiment in the state which abbreviate | omitted the reinforcement cross member and each gusset member. It is the II-II sectional view taken on the line of FIG. It is a front view showing the same rear body structure. It is a principal part expansion perspective view which shows the rear vehicle body structure. It is a perspective view which shows the rear cross member of the rear part vehicle body structure. It is a perspective view which shows the bracket of the rear part vehicle body structure. It is a principal part enlarged view of FIG. It is a VIII-VIII line arrow directional cross-sectional view of FIG. It is a perspective view which shows a 2nd gusset member. It is explanatory drawing explaining the effect | action of the said rear part vehicle body structure.

2 Rear side frame 3 Rear cross member 4 Rear suspension 5 Rear floor panel 6 Car body side wall 7 Reinforcement cross member 8 Rear package member 12 Second gusset member (gusset member)
30 Main cross member 31 Branch member

Claims (5)

The rear floor panel includes a pair of left and right rear side frames disposed along the longitudinal direction of the vehicle body, and a rear cross member installed between the rear side frames. A damper member of the rear suspension is provided on the rear cross member. In the rear car body structure of a supported automobile,
Extending in the vehicle height direction along the vehicle-body side wall, and a connecting member forming a closed cross section for vertical section taken along the vehicle width direction together with the vehicle body side wall, opposite ends and extends along the vehicle width direction via the connecting member together are joined to the body sidewall Te, at least a reinforcing cross member is disposed in a state facing the right and left end portions, the support position of the damper member in the reinforcing cross members of the rear cross member across the rear floor panel And a gusset member for connecting the connecting member and the connecting member in a brace shape . The rear cross member has a main cross member extending linearly along the vehicle width direction, and a branch members formed by branching respectively from the left and right ends of the main cross member, said damper member is the main 2. The automobile according to claim 1 , wherein the reinforcing cross member is pivotally supported across the cross member and the branch member, and the reinforcing cross member is disposed to face the branch member across the rear floor panel. Rear body structure. Characterized in that disposed above the reinforcing cross member provided with a rear package member in the vehicle width direction both ends are respectively joined to the vehicle body left and right side walls of said connecting member is joined to the left and right end portions of the rear package member The rear body structure of an automobile according to claim 1 or 2 . The gusset member has a flat portion having a predetermined width in the front-rear direction of the vehicle body, and front and rear side wall portions extending in a substantially vertical direction from both front and rear edges of the vehicle body in the flat portion, and a flat surface at one end portion of the gusset member together parts are arranged along the reinforcing cross members, one of claims 1 to 3 flat portion at the other end, characterized in that it is arranged along the connecting member 1 The rear body structure of the automobile according to the item . The front side wall portion of the gusset member is formed to hang from the flat surface portion, while the rear side wall portion of the gusset member is formed to rise substantially vertically from the flat surface portion, and the reinforcing cross member is formed by these front and rear side wall portions. The rear vehicle body structure according to claim 4 , wherein the rear vehicle body structure is joined to the connecting member.

Images