JP2009143476A - Rear structure of vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear structure of a vehicle body capable of effectively dispersing loads applied to a rear portion of a vehicle body from sides thereof. <P>SOLUTION: A rear structure of a vehicle body 10 includes: a pair of center pillars 12 provided at both sides in the vehicle width direction, respectively, a center cross member 32 for connecting lower ends 12A of the pair of center pillars 12, front and rear beams 40 which are longer in the vehicle width direction and are laid over between the center pillar 12 and a wheel house brace 30 in the rear position behind the pillars 12 in the vehicle longitudinal direction, a cross member 46 which is longer in the vehicle width direction and arranged so as to transmit loads between the pair of right and left, front and rear beams 40, and a coupling bracket 48 for coupling the cross member 46 and the center cross member 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle body rear structure.

A technique is known in which a load receiving member for receiving a load from an impact beam of the rear door is provided on a cross member that bridges the left and right rockers between the front and rear intermediate portions of the door opening for passengers getting on and off the rear seat passenger (for example, Patent Document 1).
JP 2007-22485 A

  However, the conventional technology as described above has a problem that it cannot be applied to a vehicle having no rear door.

  An object of the present invention is to obtain a vehicle body rear portion structure that can effectively disperse a load input from the side to a vehicle body rear portion.

  The vehicle body rear part structure according to the invention of claim 1 includes a pair of left and right center pillars respectively provided on both sides in the vehicle width direction, and a cross member connecting between the lower ends of the pair of center pillars in the vehicle vertical direction, A pair of left and right front and rear skeleton members that extend in the vehicle front-rear direction and bridge a center pillar and a vehicle body skeleton located on the rear side in the vehicle front-rear direction with respect to the center pillar; A vehicle width skeleton member disposed between the longitudinal intermediate portions of the pair of front and rear skeleton members so as to transmit a load in the vehicle width direction, a longitudinal intermediate portion of the vehicle width skeleton member, and a longitudinal intermediate portion of the cross member And a connecting member for connecting the two.

  In the vehicle body rear part structure according to claim 1, for example, when a load is applied from the side of the vehicle between the center pillar and the vehicle body skeleton portion located on the rear side in the vehicle longitudinal direction with respect to the center pillar, Input to the front and rear skeleton members. The load input to the front and rear skeleton members is further distributed into at least a path transmitted to the cross member via the center pillar and a path transmitted to the vehicle width skeleton member. Further, a part of the load transmitted to the vehicle width skeleton member is transmitted to the front and rear skeleton members on the opposite sides, and the other part is transmitted to the cross member via the connecting member. As described above, when a load is input at a position away from the center pillar, a plurality of load transmission paths to the cross member, which is the main skeleton member, are formed. Even when a load is further input to the center pillar side, a route is formed in which the load is transmitted to the cross member via the front and rear skeleton members, the vehicle width skeleton member, and the connecting member. Deformation is also suppressed.

  Thus, in the vehicle body rear structure according to the first aspect, the load input from the side can be effectively dispersed in the vehicle body rear portion.

  A vehicle body rear structure according to a second aspect of the present invention is the vehicle body rear structure according to the first aspect, wherein the vehicle body outer plate and the front and rear skeleton members are overlapped with the end of the vehicle width skeleton member in a side view of the vehicle. And a gap filling member disposed between the two.

  In the vehicle body rear structure according to the second aspect, the load input to the vehicle body outer plate is input to the front and rear skeleton members via the gap filling member. Thereby, load distribution can be achieved as described above from the initial stage of load input to the vehicle body outer plate.

  The vehicle body rear structure according to the invention described in claim 3 is the vehicle body rear structure according to claim 1 or 2, wherein the portion between the connection portion of the cross member and the connection portion of the front and rear skeleton members in the center pillar is provided. And a load transmission member for connecting the cross member.

  In the rear structure of the vehicle body according to claim 3, there is a path through which a load input directly or indirectly to a position separated in the vehicle vertical direction with respect to the cross member in the pillar is transmitted to the cross member via the load transmitting member. It is formed. Thereby, in this vehicle body rear part structure, a load can be disperse | distributed more efficiently.

  A vehicle body rear structure according to a fourth aspect of the present invention is the vehicle body rear structure according to any one of the first to third aspects, wherein the vehicle body skeleton portion located on the rear side in the vehicle front-rear direction with respect to the center pillar is The wheel house reinforcing member for reinforcing the wheel house that houses the rear wheel and the bridging member that bridges between the wheel house reinforcing members located on both sides in the vehicle width direction are configured.

  In the vehicle body rear structure according to the fourth aspect, a load transmission path through which an input load from the side of the vehicle is further transmitted to the wheel house reinforcing member and the bridging member is formed. That is, it is possible to more effectively disperse the load input from the side to the rear portion of the vehicle body. On the other hand, it is possible to disperse the load input to the wheel house via the front and rear skeleton members and the vehicle width skeleton member.

  As described above, the vehicle body rear portion structure according to the present invention has an excellent effect that the load input from the side can be effectively dispersed in the vehicle body rear portion.

  A vehicle body rear structure 10 according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in the drawing indicates a forward direction in the vehicle longitudinal direction, an arrow UP indicates an upward direction in the vehicle vertical direction, an arrow IN indicates an inner side in the vehicle width direction, and an arrow OUT indicates an outer side in the vehicle width direction.

  FIG. 1 is a perspective view showing a schematic overall configuration of the vehicle body rear structure 10. 2 is a schematic side view of the vehicle body rear structure 10, and FIG. 3 is a schematic plan sectional view of the vehicle body rear structure 10. As shown in these drawings, the vehicle body rear structure 10 includes a center pillar 12. The center pillar 12 is a skeletal member that is raised along the vehicle vertical direction from a substantially middle portion in the vehicle longitudinal direction in the rocker 14 that is a skeleton member at the outer end in the vehicle width direction that is elongated in the vehicle longitudinal direction. It is said that.

  The upper end portion of the center pillar 12 in the vehicle vertical direction is connected to the vehicle front-rear direction intermediate portion of the roof side rail 16 which is a skeleton portion of the vehicle upper portion. On the front side in the vehicle front-rear direction with respect to the center pillar 12, a passenger opening / closing door opening 18 surrounded by the center pillar 12, the rocker 14, the roof side rail 16, and a front pillar (not shown) is formed.

  On the other hand, on the rear side in the vehicle longitudinal direction with respect to the center pillar 12, the center pillar 12, the rocker 14, the roof side rail 16, a rear wheel house inner 20 that accommodates a rear wheel (not shown), a rear pillar 21, and the like are surrounded. An opening 22 is formed. As shown in FIGS. 1 and 2, the opening 22 is disposed on the outer side (side) in the vehicle width direction with respect to the rear seat 26.

  As shown in FIG. 3, the opening 22 is covered and closed from the outside in the vehicle width direction by a rear fender panel 24 as a vehicle body outer plate. A front end 24A of the rear fender panel 24 is joined to the center pillar 12, and a rear end 24B of the rear fender panel 24 is hemmed to a rear wheel house outer 28 that forms a rear wheel house 25 with the rear wheel house inner 20. It is fixed by.

  In the vehicle body rear structure 10, the inner side in the vehicle width direction of the rear wheel house inner 20 is reinforced by a wheel house brace 30 as a wheel house reinforcing member. As shown in FIG. 3, the wheel house brace 30 and the rear wheel house inner 20 form a skeleton structure with a closed cross section. This skeleton structure corresponds to “a vehicle body skeleton portion located on the rear side in the vehicle longitudinal direction with respect to the center pillar” in the present invention.

  Although illustration is omitted, the configuration described above is formed substantially symmetrically (laterally symmetric) with respect to the center in the vehicle width direction. The vehicle body rear structure 10 includes a center floor cross member 32 as a cross member spanning between the lower ends 12A of the pair of left and right center pillars 12. The center floor cross member 32 forms a closed section structure with a floor panel (not shown), and is a main skeleton member extending in the vehicle width direction. A center floor cross gusset 34 as a load transmission member is provided at the outer end of the center floor cross member 32 in the vehicle width direction.

  The center floor cross gusset 34 is formed in a substantially triangular shape when viewed from the front where the height in the vehicle vertical direction is maximum at the outer end 34A in the vehicle width direction and the height in the vehicle vertical direction is minimum at the inner end in the vehicle width direction. In plan view, it has a substantially rectangular shape. As shown in FIG. 4, the center floor cross gusset 34 has a lower end 34B joined to the upper surface of the center floor cross member 32 and an outer end 34A in the vehicle width direction joined to the inner surface in the vehicle width direction of the center pillar 12. (Not shown). In this state, the center floor cross gusset 34 forms a closed cross-sectional structure with the center floor cross member 32. The center floor cross gusset 34 and the center floor cross member 32 may be joined by the fastening means 42 or may be joined by spot welding or the like.

  On the other hand, the pair of left and right wheel house braces 30 is bridged by a seat back reinforcement 35 as a bridging member. The seat back reinforcement 35 is configured to function as a reinforcing member that suppresses deformation of the seat back 26A of the rear seat 26 with respect to a load inward in the vehicle width direction.

  A passenger opening / closing door opening 18 located in front of the vehicle body rear structure 10 is opened and closed by a door 36 shown in FIG. In a state in which the door 36 closes the passenger opening 18 for getting on and off the passenger, the rear end 38A of the impact beam 38 of the door 36 overlaps the lower portion of the center pillar 12.

  As shown in FIGS. 1 to 3, the vehicle body rear structure 10 includes front and rear beams 40 as front and rear skeleton members that are elongated in the vehicle front-rear direction. The front / rear beam 40 is bridged between the center pillar 12 and the wheel house brace 30 at a position spaced above the rocker 14 in the vertical direction of the vehicle. More specifically, the front end 40A of the front / rear beam 40 is joined slightly above the joining portion of the center floor cross gusset 34 in the center pillar 12, and the rear end 40B of the front / rear beam 40 is joined to the wheel house brace 30. It is joined to the front of the connection part of the seat back reinforcement 35.

  As described above, the front and rear beams 40 are arranged so as to divide the opening 22 into upper and lower parts in a side view. In this embodiment, the front end 40A and the rear end 40B of the front and rear beams 40 are fixedly joined to the center pillars 12 and 30 by fastening means 42 including bolts 42A and nuts 42B, respectively. Further, the front end 40 </ b> A and the rear end 40 </ b> B of the front / rear beam 40 are located on the outer side in the vehicle width direction with respect to the center pillar 12 and the wheel house brace 30. Further, in this embodiment, the front and rear beams 40 are made of a pipe material having a substantially circular closed cross section, and have sufficient rigidity (stiffness equivalent to that of the impact beam 38).

  A gap filling member 44 is disposed between the front and rear beams 40 and the rear fender panel 24. The gap filling member 44 is positioned between a substantially intermediate portion in the longitudinal direction of the front and rear beams 40 and the rear fender panel 24, and is fixed to one of the front and rear beams 40 and the rear fender panel 24, for example. The gap filling member 44 only needs to be able to transmit an inward load in the vehicle width direction to the front and rear beams 40 while suppressing deformation of the rear fender panel 24. For example, a block (solid) ), A box shape (hollow), a honeycomb shape, a waffle shape, or the like can be used.

  The vehicle body rear structure 10 includes a cross bar 46 as a vehicle width skeleton member that is elongated in the vehicle width direction and is positioned between the pair of left and right front and rear beams 40. The cross bar 46 is disposed inside the seat cushion 26B of the rear seat 26 or below the seat cushion 26B. As shown in FIG. 5, the cross bar 46 is connected at its longitudinal intermediate portion to the longitudinal intermediate portion of the center floor cross member 32 via a connecting bracket 48 as a connecting member. Thereby, the cross bar 46 is supported by the vehicle body via the connection bracket 48 and the center floor cross member 32. In this embodiment, as shown in FIG. 5, the connecting bracket 48 has a rear end 48A joined to the cross bar 46 by welding or the like, and a front end 48B to the center floor cross member 32, etc. It is concluded at.

  A longitudinal end portion 46A of the cross bar 46 is joined or disposed close to the vehicle width direction inner side with respect to a substantially middle portion of the front / rear beam 40 in the vehicle front-rear direction. For example, a vehicle interior material (trim), a skin material of the rear seat 26, or the like may be interposed between the longitudinal end portion 46A of the cross bar 46 and the front and rear beams 40. Further, as shown in FIG. 2, the longitudinal end 46 </ b> A of the cross bar 46 is disposed so as to overlap the gap filling member 44 in a side view. In other words, the cross bar 46 and the gap filling member 44 are arranged so as to sandwich a substantially middle portion of the front and rear beam 40 in the vehicle front-rear direction.

  Next, the operation of this embodiment will be described.

  In the vehicle body rear structure 10 having the above-described configuration, for example, as shown in FIG. 6, when a load Fi accompanying a side collision is input to an area A <b> 1 between the center pillar 12 and the wheel house brace 30, the load Fi is The light is transmitted to the front and rear beams 40 mainly through the gap filling member 44. As shown in FIGS. 6 and 7, this load is further transmitted by the front and rear beams 40 to the path A transmitted to the cross bar 46, the path B transmitted to the center pillar 12, and the wheel house brace 30. Distributed to path C.

  As shown in FIG. 7, the load distributed in the path A is transmitted from the cross bar 46 directly to the anti-collision side (front / rear beam 40) and the center from the cross bar 46 via the connecting bracket 48. Distributed to the route E transmitted to the floor cross member 32. Further, the load distributed in the path B is a path F that is transmitted from the center pillar 12 to the center floor cross member 32, and a path G that is distributed from the center pillar 12 to the center floor cross member 32 via the center floor cross gusset 34. And distributed. The load transmitted from the paths E, F, and G to the center floor cross member 32 is transmitted to the anti-collision side (center pillar 12 and rocker 14) via the center floor cross gusset 34.

  On the other hand, the load distributed in the path C is transmitted from the wheel house brace 30 to the anti-collision side (the wheel house brace 30) through the path H via the seat back reinforcement 35.

  Thus, in the vehicle body rear structure 10, the load Fi input between the center pillar 12 and the wheel house brace 30 can be distributed to a plurality of paths and transmitted to the anti-collision side. For this reason, in the vehicle body rear structure 10, deformation of the rear seat 26 side portion (the rear fender panel 24 and the like) in which the opening 22 is formed in the vehicle body can be effectively suppressed. In particular, in the vehicle body rear structure 10, a part of the load (paths A and D) transmitted from the gap filling member 44 to the cross bar 46 via the front and rear beams 40 is further connected to the center having high rigidity via the connection bracket 48. Since it is distributed (path E) to the floor cross member 32, deformation of the intermediate portion in the vehicle longitudinal direction, which is most likely to be large in deformation between the center pillar 12 and the wheel house brace 30, is effectively suppressed. Is done.

  This point will be described in comparison with a comparative example shown in FIG. The vehicle-to-rear structure 100 shown in FIG. 18 is different from the vehicle body rear structure 10 in that it does not have the front and rear beams 40, the gap filling member 44, the cross bar 46, and the connection bracket 48. In the vehicle-to-rear structure 100, when a load is input between the center pillar 12 and the wheel house brace 30, the rear fender panel 24 is mainly deformed to the vehicle interior side by this load. Therefore, in the vehicle-to-rear structure 100, in order to suppress this deformation, the center pillar 12, the rocker 14, the roof side rail 16, the rear wheel house inner 20 (wheel house brace 30), the rear pillar 21, the center floor cross member 32, It is necessary to reinforce (stiffen) the seat back reinforcement 35 as a whole, which causes an increase in vehicle mass.

  On the other hand, in the vehicle body rear structure 10, the load input between the center pillar 12 and the wheel house brace 30 as described above is provided by providing the front and rear beams 40, the gap filling member 44, the cross bar 46, and the connection bracket 48. Since Fi can be distributed to a plurality of transmission paths and transmitted to the anti-collision side, the deformation to the vehicle interior side between the center pillar 12 and the wheel house brace 30 can be effectively suppressed while being lightweight. Can do.

  Further, in the vehicle body rear structure 10, by providing the gap filling member 44, the load Fi can be transmitted to the front and rear beams 40 from the beginning of the collision (load input) to the rear fender panel 24, and the vehicle body deformation is further effectively performed. Can be suppressed.

  Here, in the vehicle body rear structure 10, the center pillar 12 or the input load Fi to the front side in the vehicle longitudinal direction from the center pillar 12, the wheel house brace 30 or the wheel house brace 30 to the rear side in the vehicle longitudinal direction. The input load Fi can be effectively dispersed. This will be specifically described below.

  For example, as shown in FIG. 8, when a load Fi accompanying a side collision is input to the front area A <b> 2 in the vehicle front-rear direction with respect to the center pillar 12, the load Fi is mainly transmitted via the impact beam 38 of the door 36. It is transmitted to the center pillar 12. The load Fi transmitted to the center pillar 12 is transmitted to the center floor cross member 32 via the path I transmitted to the center floor cross member 32 and the center floor cross gusset 34 as shown in FIG. 9A. And a path K transmitted to the front and rear beams 40.

  Further, the load distributed in the path K is distributed into the path L transmitted to the cross bar 46 and the path M transmitted to the wheel house brace 30. The load distributed in the path L is transmitted from the cross bar 46 directly to the anti-collision side (front / rear beam 40) and from the cross bar 46 to the center floor cross member 32 via the connecting bracket 48. Are distributed to the route O. The load transmitted from the paths I, J, and O to the center floor cross member 32 is transmitted to the anti-collision side (center pillar 12 and rocker 14) via the center floor cross gusset 34. Further, the load distributed in the path M is transmitted from the wheel house brace 30 to the anti-collision side (wheel house brace 30) through the path P via the seat back reinforcement 35.

  On the other hand, for example, the vehicle-to-rear structure 100 shown in FIG. 18 does not have the front and rear beams 40, so that the load Fi is transmitted to the anti-collision side only by the paths I and J as shown in FIG. 9B. The center pillar 12, the center floor cross member 32, and the center floor cross gusset 34 are required to have high rigidity.

  On the other hand, in the vehicle body rear structure 10, as described above with reference to FIG. 9A, the front and rear beams 40 and the cross bar 46 are provided for the collision load from the center pillar 12 to the front side in the vehicle longitudinal direction. Thus, it can be distributed to the anti-collision side by a plurality of routes. For this reason, in the vehicle body rear part structure 10, the vehicle body deformation | transformation with respect to a side collision can be suppressed effectively, although it is lightweight. Even when the load Fi accompanying the side collision is input to the center pillar 12, the impact beam 38 of the door 36 is positioned so as to wrap outside the center pillar 12 in the vehicle width direction. is there.

  Further, for example, as shown in FIG. 10, when a load Fi accompanying a side collision is input to an area A3 on the rear side in the vehicle longitudinal direction from the wheel house brace 30, this load Fi is shown in FIG. Thus, the path Q is transmitted from the wheel house brace 30 to the seat back reinforcement 35 and the path R is transmitted from the wheel house brace 30 to the front and rear beams 40. The load distributed in the path Q is transmitted from the wheel house brace 30 to the anti-collision side (wheel house brace 30) through the path S via the seat back reinforcement 35.

  Further, the load distributed in the path R is distributed into the path T transmitted to the cross bar 46 and the path U transmitted to the center pillar 12. The load dispersed in the path T is transmitted from the cross bar 46 directly to the anti-collision side (front and rear beam 40) and from the cross bar 46 to the center floor cross member 32 via the connecting bracket 48. Are distributed to the path W. Further, the load distributed to the path U is a path X transmitted from the center pillar 12 to the center floor cross member 32, and a path Y distributed from the center pillar 12 to the center floor cross member 32 via the center floor cross gusset 34. And distributed. The load transmitted from the paths W, X, and Y to the center floor cross member 32 is transmitted to the anti-collision side (center pillar 12 and rocker 14) via the center floor cross gusset 34.

  On the other hand, for example, the vehicle-to-rear structure 100 shown in FIG. 18 does not have the front / rear beam 40, so as shown in FIG. 11B, only the routes Q and S (substantially one route) reach the anti-collision side. The load Fi is transmitted, and the wheel house brace 30 and the seat back reinforcement 35 are required to have high rigidity.

  On the other hand, in the vehicle body rear structure 10, as described above with reference to FIG. 11A, the front and rear beams 40 and the crossbar 46 are also applied to the collision load from the wheel house brace 30 to the rear side in the vehicle longitudinal direction. Can be distributed to the anti-collision side through a plurality of paths. For this reason, in the vehicle body rear part structure 10, the vehicle body deformation | transformation with respect to a side collision can be suppressed effectively, although it is lightweight. The same applies when the load Fi accompanying the side collision is input to the wheel house brace 30.

  Further, each component and part of the vehicle body rear structure 10 can be variously modified as exemplified below.

(First modification)
FIG. 12A shows a front / rear beam 50 in which the front / rear beam 40 and the gap filling member 44 are integrated. The front / rear beam 50 has a configuration in which the section modulus is larger in the portion where the integrated gap filling portion 52 is formed, as shown in FIG. For example, the front and rear beams 40 shown in FIG. 12C have a substantially constant section modulus at each portion in the longitudinal direction as shown in FIG.

  By the way, for example, as shown in FIG. 13B, when a load Fi accompanying a side collision is applied in the vicinity of the center pillar 12, the front and rear beams 40 and 50 (the front and rear beams 40 are shown in FIG. 13). The bending moment acting on is as shown in FIG. Further, as shown in FIG. 13D, when a load Fi accompanying a side collision acts in the vicinity of the gap filling member 44, bending moments acting on the front and rear beams 40 and 50 are shown in FIG. 13C. It becomes like this. From these figures, it can be seen that the bending moment acting on the front and rear beams 40 and 50 is maximized in the vicinity of the intermediate portion in the longitudinal direction of the front and rear beams 40 and 50 at any collision position. For this reason, by using the front / rear beam 50 having a large section modulus in the intermediate portion in the longitudinal direction, the deformation of the vehicle body toward the vehicle interior side can be suppressed more effectively than in the case where the front / rear beam 40 is used.

(Second modification)
FIG. 14 shows an example in which the front ends 40A and 40B of the front and rear beams 40 are fastened to the center pillar 12 and the wheel house brace 30 on the inner side in the vehicle width direction. Even in this configuration, the same effect can be obtained by the same operation as in the above embodiment in which the front and rear beams 40 are fixed to the center pillar 12 and the wheel house brace 30 in the vehicle width direction outside. The front ends 40A and 40B of the front and rear beams 40 may be fastened to the center pillar 12 and the wheel house brace 30 either on the inner side in the vehicle width direction and on the other side on the outer side in the vehicle width direction. Further, the front ends 40A and 40B of the front and rear beams 40 are not limited to the configuration that is fastened to the center pillar 12 and the wheel house brace 30 by the fastening means 42, and may be joined by welding, for example.

(Third Modification)
FIG. 15A shows a longitudinal cross-sectional view of a longitudinal beam 55 in place of the longitudinal beam 40 having a circular closed sectional structure. As shown in this figure, the front and rear beam 55 has a substantially rectangular frame-shaped closed cross section by joining an outer panel 56 having a hat-shaped cross section that opens inward in the vehicle width direction and an inner panel 58 that closes the opening end of the outer panel 56. It has a structure. The inner panel 58 may be formed in a flat plate shape, but FIG. 15 shows an example having a cross-sectional hat shape. Even in the configuration including the front and rear beams 55, the same effect can be obtained by the same operation as that of the above-described embodiment having the front and rear beams 40 having a circular cross section.

  In FIG. 15B, a front / rear beam 60 instead of the front / rear beam 40 is shown in a cross-sectional view perpendicular to the longitudinal direction. As shown in this figure, the front and rear beam 60 has a substantially corrugated cross section in which a portion opening inward in the vehicle width direction and a portion opening outward are alternately arranged in the vehicle vertical direction. As a result, the front and rear beams 60 are configured to have sufficient rigidity against bending while having an open cross-sectional structure. Even in the configuration including the front and rear beams 60, the same effect can be obtained by the same operation as that of the above embodiment having the front and rear beams 40 having a circular cross section.

(Fourth modification)
FIG. 16 is a perspective view showing an example having a center floor cross gusset 65 provided integrally with the center floor cross member 32 instead of the center floor cross gusset 34. Even in the configuration provided with the center floor cross gusset 65, the same effect can be obtained by the same operation as that of the above embodiment in which the separate center floor cross gusset 34 is joined to the center floor cross member 32. Further, in the configuration including the center floor cross gusset 65, the number of parts can be reduced.

(5th modification)
FIG. 17 shows an example in which the cross bar 46 and the center floor cross member 32 are connected via the seat frame (seat cushion frame) 70 of the rear seat 26 instead of the configuration having the connecting bracket 48 as the connecting member. It is shown in a sectional view. As shown in this figure, the cross bar 46 is fixed to the seat frame 70 via a bracket 72. A front portion 70A of the seat frame 70 as a connecting member is joined to a center floor cross member 32 (a front wall portion thereof) by fastening means 42. On the other hand, the rear portion 70 </ b> B of the seat frame 70 of the rear seat 26 is fixed to the closed cross-section structure portion of the rear side cross member 76 provided below the floor panel 74.

  Even in a configuration in which the seat frame 70 of the rear seat 26 connects the cross bar 46 and the center floor cross member 32 in place of the connection bracket 48, the cross bar 46 to the center floor cross member 32 via the seat frame 70 of the rear seat 26. The load transmission is fulfilled. Therefore, also in this configuration, the same effect can be obtained by the same operation as the above embodiment.

  Needless to say, the present invention can be variously modified and implemented without departing from the gist of the present invention other than those exemplified above.

1 is a perspective view showing a schematic overall configuration of a vehicle body rear structure according to an embodiment of the present invention. 1 is a side view schematically showing a vehicle body rear structure according to an embodiment of the present invention. It is a plane sectional view showing typically the vehicle body rear part structure concerning the embodiment of the present invention. It is a longitudinal cross-sectional view in the longitudinal direction of a center floor cross member and a center floor cross gusset that constitute a vehicle body rear structure according to an embodiment of the present invention. It is a sectional side view which shows the center floor cross member, cross bar, and connection bracket which comprise the vehicle body rear part structure which concerns on embodiment of this invention. It is a top sectional view showing typically the 1st collision form to vehicles to which a vehicle body rear part structure concerning an embodiment of the present invention was applied. It is a mimetic diagram showing a load transmission course in the 1st collision form to vehicles to which a vehicle body rear part structure concerning an embodiment of the present invention was applied. It is a plane sectional view showing typically the 2nd collision form to vehicles to which a vehicle body rear part structure concerning an embodiment of the present invention was applied. (A) is a schematic diagram showing a load transmission path in a second collision mode to a vehicle to which the vehicle body rear structure according to the embodiment of the present invention is applied, and (B) is the same in the comparative example shown in FIG. It is a schematic diagram which shows the load transmission path | route in a collision form. It is a top sectional view showing typically the 3rd collision form to vehicles to which a vehicle body rear part structure concerning an embodiment of the present invention was applied. (A) is a schematic diagram showing a load transmission path in a third collision mode to a vehicle to which the vehicle body rear structure according to the embodiment of the present invention is applied, and (B) is the same in the comparative example shown in FIG. It is a schematic diagram which shows the load transmission path | route in a collision form. It is a figure which shows the modification of the front-back beam which comprises the vehicle body rear part structure which concerns on embodiment of this invention, Comprising: (A) is a schematic diagram which shows the shape of the front-back beam which concerns on a modification, (B) concerns on a modification. The figure which shows the cross-sectional coefficient in the longitudinal direction part of the shape of the front and back beam, (C) is a schematic diagram which shows the shape of the front and rear beam according to the embodiment, and (D) is the longitudinal part of the shape of the front and rear beam according to the embodiment. It is a figure which shows the section modulus in. (A) is a bending moment diagram in the second collision mode of the front and rear beams constituting the vehicle body rear structure according to the embodiment of the present invention, and (B) is a second to the vehicle body rear structure according to the embodiment of the present invention. Schematic diagram showing the collision mode, (C) is a bending moment diagram in the first collision mode of the front and rear beams constituting the vehicle body rear structure according to the embodiment of the present invention, (D) according to the embodiment of the present invention. It is a schematic diagram which shows the 1st collision form to a vehicle body rear part structure. It is a plane sectional view showing the modification of the attachment structure to the vehicle body of the front and rear beams constituting the vehicle body rear structure according to the embodiment of the present invention. (A), (B) is a figure which shows the modified example from which the front-and-rear beam which comprises the vehicle body rear part structure which concerns on embodiment of this invention differs. It is a perspective view which shows the modification of the center floor cross gusset which comprises the vehicle body rear part structure which concerns on embodiment of this invention. FIG. 10 is a side cross-sectional view showing a modified example of a connection structure between a cross bar and a center floor cross member constituting the vehicle body rear portion structure according to the embodiment of the present invention. It is a plane sectional view showing the body rear part structure concerning the comparative example with the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body rear part structure 12 Center pillar 20 Rear wheel house (vehicle body frame | skeleton part located in the back side of a vehicle front-back direction rather than a center pillar)
24 Rear fender panel (vehicle skin)
30 Wheelhouse brace (vehicle body skeleton located on the rear side in the vehicle longitudinal direction from the center pillar)
32 Center floor cross member (cross member)
34 Center floor cross gusset (load transmission member)
35 Seatback reinforcement (cross-linking member)
40 Front and rear beams (front and rear skeleton members)
44 Gap filling member 46 Cross bar (vehicle width frame member)
48 Connecting bracket (connecting member)
50, 55, 60 Front and rear beams (back and forth skeleton members)
52 Gap filling part (gap filling member)
65 Center floor cross gusset (load transmission member)
70 Seat frame (connecting member)

Claims (4)

A pair of left and right center pillars provided on both sides in the vehicle width direction,
A cross member connecting the lower ends of the pair of center pillars in the vehicle vertical direction;
A pair of left and right front and rear skeleton members that are longitudinal in the vehicle front-rear direction and bridge a center pillar and a vehicle body skeleton located on the rear side in the vehicle front-rear direction from the center pillar;
A vehicle width skeleton member that is longitudinal in the vehicle width direction and is arranged between the longitudinal intermediate portions of the pair of left and right front and rear skeleton members so as to be able to transmit a load in the vehicle width direction;
A connecting member that connects the longitudinal intermediate portion of the vehicle width skeleton member and the longitudinal intermediate portion of the cross member;
Car body rear structure with   The vehicle body rear part structure according to claim 1, further comprising a gap filling member disposed between a vehicle body outer plate and the front and rear skeleton members so as to overlap with an end portion of the vehicle width skeleton member in a side view of the vehicle.   The vehicle body rear portion according to claim 1 or 2, further comprising a load transmission member that connects the cross member to a portion between the connection portion of the cross member and the connection portion of the front and rear skeleton members in the center pillar. Construction.   The vehicle body skeleton located on the rear side in the vehicle front-rear direction with respect to the center pillar includes a wheel house reinforcing member for reinforcing a wheel house that houses the rear wheel, and the wheel house reinforcing member located on both sides in the vehicle width direction. The vehicle body rear part structure according to any one of claims 1 to 3, comprising a bridging member that bridges the gap.

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