JP4670280B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear vehicle body structure including a pair of left and right gusset members that directly or indirectly connect a rear floor panel and a pair of left and right vehicle body side walls.

  Conventionally, from the viewpoint of improving the torsional rigidity of the rear vehicle body, a rear floor panel extending along the front-rear direction of the vehicle body and a rear package member disposed along the vehicle width direction above the rear floor panel, or the rear floor 2. Description of the Related Art There is known a rear vehicle body structure in which a pair of left and right brace-like gusset members that connect vehicle body side walls disposed on both ends of a panel in the vehicle width direction are provided.

For example, Patent Document 1 discloses a tunnel reinforcement that extends along the front-rear direction of the vehicle body at the center of a rear floor panel and a tunnel reinforcement that is disposed along the tunnel and forms a closed cross section. And a rear package member extending in the vehicle width direction above the rear floor panel, and a pair of left and right V-shaped gussets for connecting the tunnel reinforcement and the rear package to improve the torsional rigidity of the rear vehicle body. A rear vehicle body structure further including a member is known.
JP 2003-137137 A

  By the way, according to the rear vehicle body structure described in Patent Document 1, the load input to the tunnel reinforcement at the time of collision or rear collision can be efficiently dispersed to the rear package member through the gusset member, for example, It is difficult to efficiently disperse a load acting on a predetermined position in the vehicle width direction, such as a load input from a wheel according to a road surface condition or a load acting by a centrifugal force.

  In recent years, with higher output of automobiles and the like, loads acting on predetermined positions in the vehicle width direction such as loads inputted from wheels tend to increase, and the loads are efficiently transmitted and distributed to the entire rear vehicle body. There is a need to further increase the rigidity of the rear vehicle body, particularly torsional rigidity.

  The present invention has been made in view of the above circumstances, and can efficiently transmit a load acting on a predetermined position in the vehicle width direction, such as a load transmitted from a wheel, to the entire rear vehicle body. It is an object of the present invention to provide a rear body structure of an automobile that can further improve the rigidity of the vehicle body, particularly the torsional rigidity.

To achieve the above object, a rear vehicle body structure of an automobile according to the present invention includes a rear floor panel extending in the front-rear direction of the vehicle body, and a vehicle body side wall including a pair of left and right wheel houses disposed on both sides of the rear floor panel in the vehicle width direction. If, at the rear body structure of a vehicle equipped with a consolidated to Ruga setting member and a pair of vehicle-body side wall of the left and right with the rear floor panel, extending in the vehicle height direction along the vehicle-body side wall, and, together with the vehicle body side wall car A connecting member that forms a closed cross-section with respect to a longitudinal section along the width direction, and a joint that is joined to the rear floor panel and that extends along the vehicle width direction and both ends are joined to the vehicle body side wall via the connecting member. further comprising a reinforcement cross member, the gusset member, in Rutotomoni other end the connecting member is joined in the vehicle width direction central portion of one end of the reinforcing cross member A first gusset member engaged, one end portion that has a second gusset member to which the other end portion while being bonded to the outside in the vehicle width direction than the central portion of the reinforcing cross member is joined to said connecting member It is a feature.

  According to the present invention, the reinforcing cross member that extends along the vehicle width direction and whose both ends are joined to the vehicle body side wall is joined to the rear floor panel. Can be transmitted to the reinforcing cross member. Here, in the conventional rear body structure, a rear cross member extending in the vehicle width direction is often provided below the rear floor panel, and the load acting on a predetermined position in the vehicle width direction is also applied to the rear cross member. Although being transmitted, by providing the reinforcing cross member on the upper side of the rear floor panel, the load can be shared with the rear cross member.

  In addition, since both ends of the reinforcing cross member are joined to the side wall of the vehicle body, and one end of the gusset member is joined to the predetermined portion, the load acting on the reinforcing cross member is efficiently transferred to the entire rear vehicle body. Can be transmitted and distributed. In particular, since the gusset member is indirectly joined to the rear floor panel via the reinforcing cross member, the load acting on the gusset member can be moderately reduced by distributing the load to the side wall of the vehicle body by the reinforcing cross member. Thus, the load can be evenly distributed over the entire rear vehicle body, and the rigidity of the rear vehicle body, in particular, the torsional rigidity can be further improved.

Also, the gusset member, since the second gusset member provided in the first gusset member in the vehicle width direction outer side provided inside the vehicle width direction is provided, efficiently disperse the further load on each gusset member In addition, the load acting on the rear floor panel and the like can be supported at four points along the vehicle width direction, thereby further improving the rigidity of the rear vehicle body.

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 along with the side wall of the vehicle body, for example, a vehicle body such as a rear pillar. Since it is joined to the side wall, the load input to the reinforcing cross member can be dispersed and transmitted to the side wall of the vehicle body, and the closed side surface 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.

The upper end portion of each gusset member, so via the connecting member by being joined to the coupling member is indirectly joined to the vehicle body side wall, the gusset member via a connecting member having high rigidity Can be efficiently transmitted to the side wall of the vehicle body, whereby the rigidity of the rear vehicle body can be further improved.

In this case, the specific shape of the first gusset member is not particularly limited. For example, the first gusset member may be a rod-shaped member, an H-shaped cross-section member, or the like. It is formed on a thin flat plate, preferably its lower end is joined to the front surface of the reinforcing cross member (claim 2).

  That is, since the first gusset member is disposed on the inner side in the vehicle width direction, if there is a thickness in the front-rear direction of the vehicle body, the space behind the gusset member is limited. Accordingly, the gusset member is formed in a flat plate shape with a thin front-rear thickness of the vehicle body, and the first gusset member is joined to the front surface of the reinforcing cross member, so that the strength against a load acting in the vehicle width direction or the vehicle height direction is increased. The rear space of the first gusset member can be secured as wide as possible while improving the rigidity of the rear vehicle body.

In this case, the first gusset member is preferably cross-section along the longitudinal direction of the vehicle body is formed as a closed cross section (claim 3).

  If comprised in this way, the intensity | strength of the 1st gusset member which is anxious about the strength fall with respect to the load along the front-back direction of a vehicle body by forming in flat form can be improved with a simple structure.

On the other hand, the specific shape of the second gusset member is not particularly limited and may be formed in the same manner as the first gusset member. For example, the second gusset member is formed along the longitudinal direction of the vehicle body. A planar portion having a predetermined width and front and rear side wall portions extending in a substantially vertical direction from both longitudinal edges of the vehicle body at the planar portion, and the planar portion at the lower end portion of the second gusset member is the reinforcing cross member. preferably it is disposed along the upper surface of the (claim 4).

  If comprised in this way, since it has a front-and-rear side wall part in addition to a plane part, the rigidity of a 2nd gusset member can be improved, and also the edge part of these 2nd gusset members is arrange | positioned along a reinforcement cross member Therefore, the load can be transmitted smoothly.

Further, the second gusset member having the flat surface portion and the front and rear side wall portions may be formed in a U-shaped cross section. For example, the front side wall portion of the second gusset member is suspended from the flat surface portion. On the other hand, the rear side wall portion of the second gusset member is formed to rise substantially perpendicularly from the plane portion, and is preferably joined to the reinforcing cross member and the connecting member at the front and rear side wall portions. Item 5).

  If comprised in this way, without attaching the rigidity of a 2nd gusset member, it can attach only by the operation | work from the front side in the case of attachment to the vehicle body of a 2nd gusset member, and attachment workability | operativity improves.

  In the present invention, a rear package member is installed between the vehicle body side walls above the reinforcing cross member, and an upper end portion of the gusset member is joined to an end portion in the vehicle width direction of the rear package member. It is preferable to be indirectly joined to the vehicle body side wall through a package member.

  According to this structure, the rear package member, the reinforcing cross member, and the vehicle body side wall can form a frame-like body and the gusset member can form a frame-like portion of the frame-like body, thereby improving the rigidity of the rear vehicle body. It can be improved dramatically.

Further, in the present invention, a cross member extending along the vehicle width direction with the rear floor panel interposed therebetween is disposed below the reinforcing cross member, and corresponds to a joining portion of the second gusset member in the reinforcing cross member. preferably, the damper member of the rear suspension to the cross member is mounted to (claim 6).

  With this configuration, since the damper member of the rear suspension is attached to the rear cross member, the load input from the wheel can be transmitted to the rear cross member, and the load input to the rear cross member can be transmitted. It can be immediately transmitted to the reinforcing cross member via the rear floor panel. Accordingly, it is possible to efficiently disperse the load in the vertical direction input to the predetermined position in the vehicle width direction, thereby improving the rigidity of the rear vehicle body.

  According to the present invention, the load acting on a predetermined position in the vehicle width direction can be distributed and transmitted to the vehicle body side wall and the gusset member by the reinforcing cross member extending in the vehicle width direction on the rear floor panel. The load acting on the predetermined position in the direction can be dispersed throughout the rear vehicle body, and there is an advantage that the rigidity of the rear vehicle body, in particular, the torsional rigidity can be further improved. In particular, since the gusset member is indirectly joined to the rear floor panel via the reinforcing cross member, the load acting on the gusset member can be moderately reduced by the reinforcing cross member. Evenly and smoothly, the load can be dispersed smoothly to improve the rigidity of the rear vehicle body.

  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 that is disposed above and between the vehicle body side walls 6 and has a rear body member 6 and a reinforcing cloth to increase the rigidity of the rear vehicle body. Further comprising a first and second gusset members 11 and 12 for connecting the Nba 7. That is, the first and second gusset members 11 and 12 are indirectly connected to the rear floor panel 5 via the reinforcing cross member 7.

  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 It is formed by being joined to a predetermined location on the side surface of the main cross member 30.

  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 and 35 formed at both ends in the longitudinal direction of the member main body 32 are joined to the outer side surface and the outer bottom surface of the frame main body 21 of the rear side frame 2 by spot welding or the like. A cross member 3 is installed.

  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 from the proximal end side joined to the main cross member 30 to the distal end side joined to the rear side frame 2. 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. In this embodiment, the polymer piece 91 is joined to the branch member 31 by bolting at two locations, while the polymer piece 92 is joined to the main cross member 30 by bolting at one location. 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. Is pivotally supported (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.

  1 and 2, the trailing arm 41 includes an arm body 41a extending in the front-rear direction of the vehicle body, a vehicle body mounting bush 41b formed at one end (front end) of the arm body 41a, and an arm body. A damper mounting bracket 41c formed at the other end (rear end) of 41a, and arm mounting portions 41d and 41e formed at the other end of the arm body 41a (the mounting portion of the second arm 43 is not shown) The arm main body 41a is provided with an insertion hole 41f for allowing the second arm 43 to pass therethrough.

  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 upper and lower damper support shafts 405 and 406, and is attached to the rear cross member 3 and the trailing arm 41 by the support shafts 405 and 406.

  That is, the upper end portion of the damper member 40 is attached to the rear cross member 3 via the bracket 9, while the lower end portion is 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. 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 an inner wall portion 631 And a front and rear side wall portion 633 extending in the vehicle height direction from the front and rear side edges, and a closed cross section 635 is formed along the vehicle width direction 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 is constructed between the left and right vehicle body side walls 6 above the reinforcing cross member 7 by joining both ends to the vehicle body side wall 6. ing. 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. Therefore, a push-up load from below acts on the rear cross member 3 supporting the upper end portion of the damper member 40 along the vehicle width direction, and the load acting on a predetermined position in the vehicle width direction is applied to the vehicle width. It is desirable to disperse efficiently along the direction. Therefore, in the present embodiment, the reinforcing cross member 7 is disposed so as to face both longitudinal ends of the rear cross member 3 with the rear floor panel 5 interposed therebetween. 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 71 is superimposed on 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, thereby forming 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 (not shown) formed by expanding both ends in the longitudinal direction of the reinforcing cross member 7 outward, and the rear cross member 3 to the rear side frame 2 is joined. 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 acting on the rear cross member 3 and acting locally at a predetermined position in the vehicle width direction. The load transmitted to the reinforcing cross member 7 is released to the vehicle body side wall 6 while sharing the load to be performed.

  In the rear vehicle body structure, first and second gusset members 11 and 12 for indirectly connecting the rear floor panel 5 and the vehicle body side wall 6 are provided in order to further improve the rigidity. Specifically, in the rear vehicle body structure, the first gusset member 11 that connects the reinforcing cross member 7, the rear package member 8, and the connecting member 63, and the second gusset member 11 that connects the reinforcing cross member 7 and the connecting member 63. And a gusset member 12.

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 front side wall 633 of the connecting member 63 by bolting, Each lower end portion is joined to a substantially central portion in the longitudinal direction of the front surface of the reinforcing cross member 7 by bolting, whereby the reinforcing cross member 7 and the connecting member 63 are connected to each other, and eventually the rear floor panel 5 and the vehicle body side wall 6 are indirectly connected. Are interconnected. 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.

  A specific configuration of the first gusset member 11 will be described by taking the first gusset member 11 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 first gusset member 11 is similarly configured. FIG. 9 is a perspective view showing the first gusset member 11 disposed on the right side in the vehicle width direction. 10 is a cross-sectional view taken along line XX of FIG.

  As shown in FIGS. 7 and 9, the first gusset member 11 includes a first brace member 11a having a recessed groove 110 that opens toward the front of the vehicle body, and a front opening of the recessed groove 110 of the first brace member 11a. A second brace member 11b that closes the portion, and a spacer 11c that forms a predetermined gap between the bottom surface of the recessed groove 110 of the first brace member 11a and the rear surface of the second brace member 11b. By assembling both the two brace members 11a and 11b via the spacer 11c, a closed cross section 11d is formed, and a thin plate shape along the front-rear direction of the vehicle body is formed.

  That is, the first brace member 11 a is formed as a plate-like member with a flange 112 whose front surface is opened by pressing a flat plate, and a plurality of through holes 111 are provided along the recessed grooves 110. And the through-hole 111 provided in the longitudinal direction both ends of the 1st brace member 11a among these through-holes 111 is formed as the bolt insertion hole 111a for attaching this 1st brace member 11a to a vehicle body. On the other hand, the second brace member 11b is formed as a lid-like member with a flange 117 that protrudes backward by pressing a flat plate, and has a fitting protrusion 115 that fits into the recessed groove 110 along its longitudinal direction. As in the first brace member 11a, a through hole 116 and a bolt insertion hole 116a are provided. The amount of protrusion of the fitting protrusion 115 is set smaller than the amount of depression of the recessed groove 110, so that a predetermined gap is formed between the fitting protrusion 115 and the recessed groove 110. . A spacer 11c is provided between the brace members 11a and 11b so as not to crush the gap when the two are assembled and tightened with a bolt at a predetermined position of the rear vehicle body. The spacer 11c is set to a size corresponding to both end portions of the first gusset member 11.

  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 mounting 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, thereby connecting the reinforcing cross member 7 and the connecting member 63 to each other. As a result, the rear floor panel 5 and the vehicle body side wall 6 (particularly the cab side inner Panel 62) is indirectly connected to each other. 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. Therefore, the reinforcing cross member 7 is connected to the connecting member 63, and thus to the vehicle body side wall 6 in a bracing manner, and is configured to improve the rigidity of each other, and a load acting on the reinforcing cross member 7 is applied to the connecting member 63. As a result, it can be transmitted to the vehicle body side wall 6.

  Specifically, the mounting position of the second gusset member 12 will be described. As shown in FIGS. 3, 8 and 12, the second gusset member 12 has an upper end directly on the inner wall 631 of the connecting member 63. In addition, the lower end portion of the reinforcing cross member 7 is 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. 11 is a perspective view showing the second gusset member 12 disposed on the right side in the vehicle width direction. 12 is a cross-sectional view taken along line XII-XII in FIG.

  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 a front end in the front-rear direction of the vehicle body in the flat portion 120, and a rear side wall portion formed substantially vertically from the rear end edge in the front-rear direction of the vehicle body in the flat portion 120. 122, and as 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, 122, the second gusset member 12 can be attached only from the front side in the front-rear direction of the vehicle body, and attachment workability is improved. improves.

  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 side wall 6 of the vehicle, thereby acting at a predetermined position in the vehicle width direction. The load can be evenly distributed in the vehicle width direction, and the displacement of the rear cross member 3 can be effectively suppressed thereby.

  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.

  Moreover, since the first and second gusset members 11, 12 are provided in a bracing manner between the reinforcing cross member 7 and the connecting member 63, the load acting on the reinforcing cross member 7 is the second gusset member 12. Also acts on the connecting member 63 through the second gusset member 12. 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 As a result, the load can be distributed and transmitted uniformly over the entire rear body of the automobile.

  That is, 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 is applied to each part of the vehicle rear portion including the reinforcing cross member 7 and the first and second gusset members 11 and 12. It can be transmitted in a distributed manner, and the displacement of the mounting portion of the rear cross member 3 to which the damper member 40 is mounted and the rear floor panel 5 can be effectively suppressed and the rigidity of the rear vehicle body is dramatically improved. be able to.

  Here, in FIG. 13, 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-described embodiment, the reinforcing cross member 7 is joined to the side wall of the vehicle body via the connecting member 63. However, the vehicle body 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 side wall 6.

  (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.

  (5) In the above embodiment, both the first gusset member 11 and the second gusset member 12 are indirectly joined to the vehicle body side wall 6 by joining their upper ends to the connecting member 63. The upper ends of the members 11 and 12 may be joined directly to the vehicle body side wall 6 or the rear package member 8.

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. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a VIII-VIII line arrow directional cross-sectional view of FIG. It is a perspective view which shows a 1st gusset member. FIG. 4 is a sectional view taken along line XX in FIG. It is a perspective view which shows a 2nd gusset member. It is the XII-XII sectional view taken on the line of FIG. 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 11 First gusset member (gusset member)
12 Second gusset member (gusset member)

Claims (6)

A rear floor panel extending in the front-rear direction of the vehicle body, a vehicle body side wall including a pair of left and right wheel houses disposed on both sides of the rear floor panel in the vehicle width direction, and a gusset member for connecting the rear floor panel and the pair of left and right vehicle body side walls In the rear body structure of a car equipped with
A connecting member that extends in the vehicle height direction along the vehicle body side wall, and that forms a closed cross section along the vehicle width direction along the vehicle width direction;
A reinforcing cross member that is joined to the rear floor panel and extends in the vehicle width direction and has both ends joined to the vehicle body side wall via the connecting member;
The gusset member includes a first gusset member having one end joined to the vehicle width direction center of the reinforcing cross member and the other end joined to the connecting member;
A rear body structure of an automobile, comprising: a second gusset member having one end portion joined to the vehicle width direction outer side than the central portion of the reinforcing cross member and the other end portion joined to the connecting member.   2. The rear body of an automobile according to claim 1, wherein the first gusset member is formed in a flat plate shape having a thin thickness in the front-rear direction of the vehicle body, and a lower end portion of the first gusset member is joined to a front surface of the reinforcing cross member. Construction.   3. The rear body structure of an automobile according to claim 2, wherein the first gusset member has a cross section along the longitudinal direction of the vehicle body as a closed cross section.   The second gusset member has a flat portion having a predetermined width along the front-rear direction of the vehicle body, and front and rear side wall portions extending in a substantially vertical direction from both front-rear end edges of the vehicle body in the flat portion. The rear body structure of an automobile according to any one of claims 1 to 3, wherein a flat portion at a lower end portion of the gusset member is disposed along an upper surface of the reinforcing cross member. The front side wall portion of the second gusset member is formed to hang from the flat surface portion, while the rear side wall portion of the second gusset member is formed to rise substantially vertically from the flat surface portion. 5. The rear body structure of an automobile according to claim 4, wherein the rear body structure is joined to the reinforcing cross member and the connecting member . A cross member extending along the vehicle width direction with the rear floor panel interposed therebetween is disposed below the reinforcing cross member, and the cross member corresponding to the joining portion of the second gusset member in the reinforcing cross member The rear body structure of an automobile according to any one of claims 1 to 5 , wherein a damper member of the suspension is attached.

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