JP2014091347A - Vehicle rear part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle rear part structure which restricts the occurrence of twist at a vehicle rear part against a vertical direction load inputted through a rear side member.SOLUTION: A rear part 10A of a vehicle 10 comprises: a rear floor panel 12; a pair of rear side members 14 which are arranged at both sides of the rear floor panel 12 in a vehicle width direction; a lower back panel 16 which extends from a rear end part of the rear floor panel 12 to an upper side of a vehicle; and quarter panels 20 which are bonded to both sides of the lower back panel 16 in the vehicle width direction. A lower back reinforcement 18 arranged at an upper side of the lower back panel 16 is provided forming a closed section together with the lower back panel 16. A side gusset 26 is provided at a rear face of the lower back panel 16 to cover a joint area between the rear side member 14 and the lower back panel 16 and to approximately form a same surface having no positional offset therebetween in a vehicle longitudinal direction in a longitudinal cross-sectional view.

Description

  The present invention relates to a vehicle rear structure.

  Patent Document 1 below discloses a structure in which an extension of a lower back of a vehicle is superposed on a closed cross section of a rear side member, and an upper connecting portion of the extension is inserted into a closed cross section of the lower back reinforcement.

JP 2001-171557 A JP 2010-162913 A JP 2008-168711 A

  In the technique described in Patent Literature 1, the position of the mating surface of the lower back and the rear side member and the mating surface of the lower back and the lower back reinforcement are different in the vehicle front-rear direction, and the upper portion of the lower back is positioned between the upper and lower mating surfaces. It arrange | positions diagonally so that the side may become a vehicle rear side rather than the lower part side. For this reason, there is a possibility that the torsion of the rear portion of the vehicle may occur with respect to the vertical load input through the rear side member during vehicle travel. There is room.

  In view of the above fact, an object of the present invention is to obtain a vehicle rear portion structure that can suppress the occurrence of twisting of the vehicle rear portion with respect to a vertical load input through a rear side member.

  A vehicle rear structure according to the invention of claim 1 is provided at the rear of the vehicle, and is disposed on both sides of the rear floor in the vehicle width direction of the vehicle and in the vehicle front-rear direction. A pair of rear side members extending along the vehicle, and a lower back that extends from the rear end portion of the rear floor in the vehicle front-rear direction toward the vehicle upper side and that joins the rear end portion of the rear side member in the vehicle front-rear direction. A lower back reinforcement disposed at an upper portion of the lower back and forming a closed cross-section with the lower back; and provided at both ends in the vehicle width direction of the rear portion of the vehicle and extending along the vehicle front-rear direction. A quarter panel joined to the vehicle width direction end portion of the lower back, and so as to cover a joint surface between the rear side member and the lower back in a vehicle rear view. Serial placed on the vehicle after side of the lower back, having a gusset formed to be substantially flush with no offset in the longitudinal direction of the vehicle in the vertical cross section.

  According to a second aspect of the present invention, in the vehicle rear portion structure according to the first aspect, the gusset covers at least a part of the mating surface between the rear side member and the lower back to a part of the mating surface between the quarter panel and the lower back. Are arranged as follows.

  According to a third aspect of the present invention, in the vehicle rear portion structure according to the first or second aspect, the gusset is arranged so as to cover a part of the mating surface between the lower back and the rear floor.

  According to a fourth aspect of the present invention, in the vehicle rear portion structure according to the first or third aspect, the gusset is disposed so as to cover a part of a mating surface of the lower back and the lower back reinforcement. .

  According to a fifth aspect of the present invention, in the vehicle rear portion structure according to any one of the first to fourth aspects, the gusset has a cross section substantially along the vehicle width direction.

  According to the first aspect of the present invention, the pair of rear side members extending along the vehicle front-rear direction are arranged on both sides of the rear floor in the vehicle width direction, and the vehicle upper side from the rear end of the rear floor in the vehicle front-rear direction. The rear back extends toward the rear, and the rear end of the rear side member in the vehicle front-rear direction is joined to the lower back. A closed cross section is formed by the lower back reinforcement and the lower back arranged on the upper part of the lower back. A quarter panel extends along the vehicle longitudinal direction at both ends in the vehicle width direction of the rear portion of the vehicle, and the rear end portion of the quarter panel is joined to the vehicle width direction end portion of the lower back. Further, a gusset is arranged on the vehicle rear surface of the lower back so as to cover the joint surface between the rear side member and the lower back in the vehicle rear view, and the gusset is substantially the same surface with no offset in the vehicle front-rear direction in the longitudinal sectional view. It is formed as follows. As a result, the load in the vertical direction input through the rear side member is efficiently transmitted around the joint surface between the rear side member and the lower back by the gusset. For this reason, torsional deformation at the rear of the vehicle is suppressed, and the rigidity can be increased efficiently.

  According to the second aspect of the present invention, the gusset is arranged so as to cover at least a part of the mating surface of the quarter panel and the lower back from the mating surface of the rear side member and the lower back, and through the rear side member. The inputted vertical load is transmitted to the mating surface of the quarter panel and the lower back having high rigidity by the gusset. For this reason, the rigidity of a vehicle rear part can be improved efficiently.

  According to the third aspect of the present invention, the gusset is arranged so as to cover up to a part of the mating surface of the lower back and the rear floor, and the vertical load input through the rear side member is caused by the gusset. It is transmitted to the mating surface between the lower back and the rear floor. For this reason, the rigidity of a vehicle rear part can be improved efficiently.

  According to the fourth aspect of the present invention, the gusset is arranged so as to cover a part of the mating surface of the lower back and the lower back reinforcement, and the load in the vertical direction inputted through the rear side member is received. The gusset is transmitted to the mating surface between the lower back and the lower back reinforcement having high rigidity. For this reason, the rigidity of a vehicle rear part can be improved further efficiently.

  According to the fifth aspect of the present invention, the gusset has substantially the same cross section along the vehicle width direction, and the load in the vertical direction input through the rear side member is more efficiently transmitted by the gusset. Is done. For this reason, the rigidity of a vehicle rear part can be improved further efficiently.

  According to the vehicle rear portion structure relating to the present invention, it is possible to suppress the occurrence of twisting of the vehicle rear portion with respect to the load in the vertical direction inputted through the rear side member.

It is a rear view which shows the vehicle rear part structure which concerns on 1st Embodiment. It is a perspective view which shows the lower back panel and side gusset of the vehicle rear part structure shown in FIG. FIG. 3 is a cross-sectional view showing a vehicle rear structure taken along line 3-3 in FIG. 1. It is a longitudinal cross-sectional view which shows the rear side member vicinity of the vehicle rear part structure shown in FIG. It is a rear view which shows the lower back panel and center gusset of the vehicle rear part structure which concern on a 1st comparative example. It is a perspective view which shows the lower back panel and side gusset of the vehicle rear part structure which concern on a 2nd comparative example.

  Hereinafter, a first embodiment of a vehicle rear structure according to the present invention will be described with reference to FIGS. Note that an arrow RR appropriately shown in these drawings indicates the vehicle rear side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 1 is a rear view of a vehicle rear portion structure 11 according to the present embodiment. FIG. 2 is a perspective view of the lower back panel of the vehicle rear structure 11. 3 is a cross-sectional view of the configuration of the vehicle rear structure 11 taken along line 3-3 in FIG. 1, and FIG. 4 shows the configuration of the vehicle rear structure 11 near the rear side member. Is shown in a longitudinal section. As shown in FIGS. 1 and 4, the rear portion 10 </ b> A of the vehicle 10 is provided with a rear floor panel 12 as a rear floor extending substantially along the vehicle front-rear direction and the vehicle width direction on the vehicle lower side. . Rear side members 14 extending along the vehicle front-rear direction are provided at the lower portions of both sides of the rear floor panel 12 in the vehicle width direction. The rear side member 14 is disposed in a pair of left and right in the vehicle width direction. The rear side member 14 has a substantially cross-sectional shape in the vehicle width direction, and flange portions (not shown) formed on both sides of the upper vehicle width direction are joined to the lower surface of the rear floor panel 12, thereby The member 14 and the rear floor panel 12 form a closed cross section.

  On the vehicle rear side of the rear floor panel 12, a lower back panel 16 is disposed as a lower back extending substantially along the vehicle vertical direction and the vehicle width direction. A lower back reinforcement 18 that is joined to the lower back panel 16 from the vehicle front side of the lower back panel 16 and forms a closed cross section with the lower back panel 16 is provided on the upper portion of the lower back panel 16 ( (See FIG. 4).

  1 and 3, the rear panel 10A of the vehicle 10 has quarter panels 20 disposed along the vehicle front-rear direction at both ends in the vehicle width direction on the vehicle front side of the lower back panel 16. Is provided. Further, as shown in FIG. 1 to FIG. 4, side gussets 26 as gussets are arranged on both sides in the vehicle width direction of the rear wall surface (vehicle rear surface) of the lower back panel 16 in the rear portion 10 </ b> A of the vehicle 10. Yes.

  As shown in FIG. 1, the rear floor panel 12 includes a concave portion 12 </ b> B whose center in the vehicle width direction is recessed toward the vehicle lower side with respect to the end portions 12 </ b> A on both sides in the vehicle width direction when viewed from the rear of the vehicle. A rear end portion of the rear floor panel 12 in the vehicle front-rear direction is formed with a concave portion 12B and a bent portion 12C that is bent upward from the rear end portions of the end portions 12A on both sides in the vehicle width direction (see FIG. 4). ). The bent portion 12C is formed over substantially the entire width of the rear floor panel 12 in the vehicle width direction. The bent portion 12C is disposed in surface contact with the front wall of the lower back panel 16, and the bent portion 12C and the lower back panel 16 are joined by welding (in this embodiment, spot welding).

  Rear floor side panels 22 as rear floors are disposed on both sides of the rear floor panel 12 in the vehicle width direction. A bent portion 22A bent to the vehicle lower side is formed at the rear end portion of the rear floor side panel 22 in the vehicle front-rear direction. The bent portion 22A is arranged in surface contact with the front wall of the lower back panel 16, and the bent portion 22A and the lower back panel 16 are joined by welding (in this embodiment, spot welding).

  At the rear end portion of the rear side member 14 in the vehicle front-rear direction, three-way flange portions 14A and 14B are formed as joint surfaces bent from the wall portion having a substantially hat-like cross section to the left and right sides and the lower side, respectively. (See FIG. 3 and FIG. 4). The flange portions 14A and 14B are arranged in surface contact with the front wall of the lower back panel 16, and the flange portions 14A and 14B and the lower back panel 16 are joined by welding (in this embodiment, spot welding).

  As shown in FIG. 2, the lower back panel 16 includes a vertical wall portion 16 </ b> A disposed in the vehicle width direction center portion along the substantially vehicle width direction and the vehicle vertical direction, and the vehicle wall direction outer side of the vertical wall portion 16 </ b> A. A wall portion 16B extending obliquely outward from the vehicle front side from both ends of the vehicle, and an outer vertical wall portion 16C extending from the outer end portion of the wall portion 16B in the vehicle width direction along the vehicle width direction and the vehicle vertical direction. It is equipped with. The aforementioned flange portions 14A and 14B of the rear side member 14 and the bent portion 22A of the rear floor side panel 22 are joined to the outer vertical wall portion 16C of the lower back panel 16 (see FIG. 1).

  As shown in FIGS. 2 and 4, the lower back panel 16 includes a vertical wall portion 16A, a wall portion 16B, and a lateral wall portion 16D extending from the upper end of the outer vertical wall portion 16C toward the vehicle rear side, An upper vertical wall portion 16E extending substantially upward from the rear end portion of the horizontal wall portion 16D, and a bent portion 16F bent from the upper end portion of the upper vertical wall portion 16E to the obliquely upper side behind the vehicle. ing.

  Further, the lower back panel 16 includes a bent flange portion 16G that is bent in a substantially crank shape from the lower end portions of the vertical wall portion 16A, the wall portion 16B, and the outer vertical wall portion 16C to the vehicle rear side.

  As shown in FIGS. 2 and 4, the lower back reinforcement 18 extends from the upper end of the vertical wall 18 </ b> A substantially along the vertical direction of the vehicle toward the vehicle rear side. A horizontal wall portion 18B and a bent portion 18C bent from the rear end portion of the horizontal wall portion 18B obliquely upward to the rear of the vehicle are provided. The lower end portion 18D of the vertical wall portion 18A is disposed in surface contact with the vertical wall portion 16A, the wall portion 16B, and the upper end portion of the outer vertical wall portion 16C of the lower back panel 16, and is welded (spot welding in this embodiment). It is joined by. The bent portion 18C of the lower back reinforcement 18 is arranged in surface contact with the bent portion 16F of the lower back panel 16, and is joined by welding (in this embodiment, spot welding). In other words, the upper and lower bent portions 18C and the lower end portion 18D of the lower back reinforcement 18 have the upper bent portion 16F and the lower end front edge of the opening cross section formed by the horizontal wall portion 16D and the upper vertical wall portion 16E of the lower back panel 16. By being coupled to the portion (vertical wall portion), a closed cross section is formed at the upper portion of the lower back panel 16 by the lower back reinforcement 18.

  As shown in FIG. 3, the quarter panel 20 extends substantially along the vehicle vertical direction and substantially the vehicle front-rear direction, and is bent at the rear end of the quarter panel 20 in the vehicle width direction inwardly. It has. The bent portion 20A of the quarter panel 20 is disposed in surface contact with the front wall of the outer vertical wall portion 16C of the lower back panel 16, and the bent portion 20A and the lower back panel 16 are welded (in this embodiment, spot welding). ) (See FIG. 1).

  As shown in FIGS. 1 to 4, the side gusset 26 is formed on the rear wall surface (vehicle rear surface) of the outer vertical wall portion 16 </ b> C of the lower back panel 16 and the flange portions 14 </ b> A and 14 </ b> B of the rear side member 14 and the lower back panel 16. It arrange | positions so that a joint surface with 16 C of outer vertical wall parts may be covered. The outer vertical wall portion 16C is formed in a substantially planar shape along the vehicle vertical direction in a longitudinal sectional view. The side gusset 26 is disposed in a surface contact state on the rear wall surface of the outer vertical wall portion 16C, and is formed so as to have substantially the same surface with no offset in the vehicle front-rear direction in a longitudinal sectional view (see FIG. 4). . Here, the “offset” is a relative position from a certain point serving as a reference, for example, being deviated in a certain direction from the position serving as the reference point. That is, “no offset” in the present embodiment means that the vehicle is not displaced in the vehicle front-rear direction from the position serving as the reference point.

  The side gusset 26 is formed in a substantially base shape when viewed from the rear of the vehicle (see FIGS. 1 and 2). The side gussets 26 on both sides in the vehicle width direction are formed symmetrically. When viewed from the rear of the vehicle, the side gusset 26 has a bent portion 20A of the quarter panel 20 and an outer vertical wall of the lower back panel 16 from the mating surface of the flange portions 14A, 14B of the rear side member 14 and the outer vertical wall portion 16C of the lower back panel 16. It arrange | positions so that a part of mating surface with the part 16C may be covered (refer FIGS. 1-3). That is, the upper side of the side gusset 26 extends outward in the vehicle width direction, and its outer end portion 26A is a part of the mating surface between the bent portion 20A of the quarter panel 20 and the outer vertical wall portion 16C of the lower back panel 16. Covering. The side gusset 26 has substantially the same cross section along the vehicle width direction in a cross sectional view (see FIG. 3).

  Further, the side gusset 26 is disposed so as to cover a part of the mating surface of the outer vertical wall portion 16C of the lower back panel 16 and the bent portion 12C of the rear floor panel 12 and the bent portion 22A of the rear floor side panel 22 in the rear view of the vehicle. Has been. Furthermore, the side gusset 26 in the vehicle rear view is such that the upper end portion 26B in the vehicle vertical direction covers a part of the mating surface between the outer vertical wall portion 16C of the lower back panel 16 and the lower end portion 18D of the lower back reinforcement 18. Is arranged. That is, the upper end portion 26B of the side gusset 26 extends along the vehicle width direction, and the upper end portion 26B disposed laterally at substantially the entire width of the side gusset 26 in the vehicle width direction is formed between the lower back panel 16 and the lower back. A part of the mating surface with the lower end 18D of the reinforcement 18 is covered.

  When viewed from the rear of the vehicle, the side gusset 26 has an inner end 26C in the vehicle width direction at the vehicle inner end of the mating surface of the flange 14A on the inner side in the vehicle width direction of the rear side member 14 and the outer vertical wall 16C of the lower back panel 16. It extends along the vehicle up-down direction at a position that covers the part. Further, the lower end portion 26D of the side gusset 26 in the vehicle vertical direction when viewed from the rear of the vehicle extends to a position that covers the mounting portion 30 of the crash box 28 disposed on the vehicle rear side (see FIG. 4).

  The peripheral edge portion of the side gusset 26 is joined to the outer vertical wall portion 16C of the lower back panel 16 by welding (in this embodiment, spot welding). At that time, the front wall of the outer end portion 26A of the side gusset 26 is disposed in surface contact with the rear wall of the outer vertical wall portion 16C of the lower back panel 16, and the quarter panel is placed on the front wall of the outer vertical wall portion 16C. The rear wall of 20 bent portions 20A is arranged in a surface contact state (see FIG. 3). In this state, the outer end portion 26A of the side gusset 26, the outer vertical wall portion 16C of the lower back panel 16, and the bent portion 20A of the quarter panel 20 are joined by welding. As a result, the load in the vehicle vertical direction (arrows A and B shown in FIG. 1) input through the rear side member 14 is applied to the lower back panel 16 and the quarter panel 20 having high rigidity from the side gusset 26 through the welded portion. It is transmitted efficiently to the joint with the bent portion 20A.

  Further, the front wall of the upper end portion 26B of the side gusset 26 is disposed in surface contact with the rear wall of the outer vertical wall portion 16C of the lower back panel 16, and lower back reinforcement on the front wall of the outer vertical wall portion 16C. The rear wall of the lower end 18D of 18 is disposed in a surface contact state (see FIG. 4). In this state, the upper end portion 26B of the side gusset 26, the outer vertical wall portion 16C of the lower back panel 16, and the lower end portion 18D of the lower back reinforcement 18 are joined by welding. Thus, the vehicle vertical load input through the rear side member 14 is applied to the joint portion between the lower back panel 16 and the lower end portion 18D of the lower back reinforcement 18 through the welded portion from the side gusset 26. It is designed to be transmitted efficiently.

  As shown in FIGS. 3 and 4, the crash box 28 is disposed on the vehicle rear side of the rear side member 14 with the outer vertical wall portion 16 </ b> C of the lower back panel 16 and the side gusset 26 interposed therebetween. Although not shown, the crash boxes 28 are arranged in pairs on both sides in the vehicle width direction. The crash box 28 has a polygonal (for example, substantially rectangular) cross section along the vehicle width direction, and a plate-like mounting portion 30 is joined to the front end of the crash box 28 by welding. . Although not shown, a plurality of recesses are formed in the wall surface of the crash box 28 along the vehicle up-down direction and the vehicle width direction, and the plurality of recesses are arranged substantially parallel to the vehicle front-rear direction. Thereby, the crash box 28 is crushed in the vehicle front-rear direction when the vehicle collides.

  The mounting portion 30 of the crash box 28 is disposed in surface contact with the rear wall of the side gusset 26. In this state, the outer vertical wall portion 16C, the side gusset 26, and the mounting portion 30 of the lower back panel 16 are illustrated. It is fastened and fixed by a fastener that does not. In this embodiment, three through holes are formed in an inverted triangular shape on the outer vertical wall portion 16C of the lower back panel 16, and a crash box is formed by passing fasteners (bolts and the like) through these through holes. 28 attachment portions 30 are fastened and fixed to the side gusset 26 and the lower back panel 16.

  In the vehicle rear portion structure 11 of the present embodiment, the side gusset 26 covers the mating surfaces (joint surfaces) of the flange portions 14A and 14B of the rear side member 14 and the lower back panel 16, and the mounting portion 30 of the crash box 28 is mounted. After securing the surface, it has a shape that hardly extends to the vehicle width direction inner side and the vehicle lower side. That is, in the side gusset 26, the outer end portion 26A is joined to a part of the mating surface between the bent portion 20A of the quarter panel 20 and the outer vertical wall portion 16C of the lower back panel 16, and the upper end portion 26B is joined to the lower back panel 16. And a lower outline 18 which is joined to a part of the mating surface of the lower back portion 18D of the lower back reinforcement 18. Thereby, the increase in the mass of the side gusset 26 is suppressed.

  The side gusset 26 is not set with vertical, horizontal and oblique beads. As a result, the load in the vehicle vertical direction inputted from the rear end portion of the rear side member 14 is dispersed without concentrating stress on the side gusset 26.

  Moreover, the rigidity of the terminal of the lower back panel 16 is ensured by providing the bending flange part 16G bent by the substantially crank shape at the lower end of the thin lower back panel 16. In addition, it may replace with the bending flange part 16G in the lower end of the lower back panel 16, and may provide the outer periphery bead and the rigidity of the terminal of the lower back panel 16 may be ensured.

  Next, the operation and effect of the vehicle rear structure 11 of the present embodiment will be described.

  As shown in FIGS. 1 and 2, the side gusset 26 is disposed so as to cover the mating surfaces of the flange portions 14 </ b> A and 14 </ b> B of the rear side member 14 and the outer vertical wall portion 16 </ b> C of the lower back panel 16. The peripheral portion of the gusset 26 is joined to the outer vertical wall portion 16C of the lower back panel 16 by welding. The side gussets 26 are formed so as to be substantially on the same plane with no offset in the longitudinal direction of the vehicle in a longitudinal sectional view. Further, the outer end portion 26A of the side gusset 26 is disposed so as to cover a part of the mating surface between the outer vertical wall portion 16C of the lower back panel 16 and the bent portion 20A of the quarter panel 20, and the side gusset 26 The outer end portion 26A, the outer vertical wall portion 16C of the lower back panel 16, and the bent portion 20A of the quarter panel 20 are joined by welding.

  Thus, the lower back panel having high rigidity is applied to the load in the vehicle vertical direction (arrows A and B shown in FIG. 1) input through the rear side member 14 during traveling of the vehicle from the side gusset 26 through the welded portion. 16 and the bent portion 20A of the quarter panel 20 can be efficiently transmitted. That is, the rear portion 10A of the vehicle 10 is transmitted in the shear direction (the surface direction of the side gusset 26) to the joint portion between the lower back panel 16 having high rigidity and the bent portion 20A of the quarter panel 20 in the vertical direction. Torsional deformation is suppressed, and the rigidity can be increased efficiently.

  Further, the side gusset 26 is disposed so as to cover a part of the mating surface of the outer vertical wall portion 16C of the lower back panel 16 and the bent portion 12C of the rear floor panel 12 and the bent portion 22A of the rear floor side panel 22. Further, the upper end portion 26B of the side gusset 26 is disposed so as to cover a part of the mating surface between the outer vertical wall portion 16C of the lower back panel 16 and the lower end portion 18D of the lower back reinforcement 18. The upper end portion 26B, the outer vertical wall portion 16C of the lower back panel 16, and the lower end portion 18D of the lower back reinforcement 18 are joined by welding. As a result, the vehicle vertical load input through the rear side member 14 is applied to the joint portion between the lower back panel 16 and the lower end portion 18D of the lower back reinforcement 18 through the welded portion from the side gusset 26. It can be transmitted efficiently. In other words, the vehicle is efficiently transmitted by transmitting the load in the vertical direction of the vehicle in the shear direction (surface direction of the side gusset 26) to the joint portion between the lower back panel 16 having high rigidity and the lower end portion 18D of the lower back reinforcement 18. 10 can increase the rigidity of the rear portion 10A.

  Further, by not setting vertical, horizontal, and diagonal beads in the side gusset 26, the vehicle vertical load input from the rear end of the rear side member 14 is distributed over a wide range without stress concentration on the side gusset 26. Can be made. As a result, a load is applied to the mating surface between the lower back panel 16 having high rigidity and the lower end portion 18D of the lower back reinforcement 18 and the joint between the lower back panel 16 and the bent portion 20A of the quarter panel 20 through welding. Can be transmitted. For this reason, the high torsional rigidity of the rear portion 10A of the vehicle 10 can be ensured.

  A general lower back structure of an automobile includes a lower back panel and a lower back reinforcement, a back door opening is formed in a closed cross section, and a lower extension thereof is a thin plate structure of one lower back panel. . Therefore, it is necessary to increase the rigidity of the lower back panel with respect to the input from the rear side member. For example, increasing the thickness of the lower back panel, welding another member such as a side gusset or center gusset to the lower back panel, and further expanding the outer shape to the inner side of the vehicle, the upper side of the vehicle, and the outer side of the vehicle. Or increasing the plate thickness of another member to increase the rigidity. Moreover, the rigidity is improved by setting a vertical bead or a horizontal bead as a separate member.

  However, to improve rigidity, increase the thickness of the lower back panel, weld another member to the lower back panel, increase the outer shape of the different member, or increase the thickness of the different member. The cost increases as the weight of the vehicle body increases. In order to improve fuel economy and steering stability, it is desirable to improve rigidity at a light weight and low cost.

  FIG. 5 shows a vehicle rear portion structure 101 of the first comparative example. As shown in FIG. 5, a center gusset 104 extending along the vehicle width direction is provided at the rear portion 100 </ b> A of the vehicle 100 at the vehicle width direction central portion of the rear wall surface of the lower back panel 102. The center gusset 104 has a substantially rectangular outer shape, and the end portions 104A on both sides in the vehicle width direction of the center gusset 104 serve as a joint surface between a pair of left and right rear side members (not shown) and the lower back panel 102. It extends to the covering position. The peripheral edge of the center gusset 104 is joined to the lower back panel 102 by welding (spot welding or the like).

  In the vehicle rear structure 101, in order to improve rigidity, the end portions 104A on both sides in the vehicle width direction of the center gusset 104 extend to a position that covers the joint surface between the pair of left and right rear side members and the lower back panel 102. As the vehicle weight increases, the cost increases.

  FIG. 6 shows a vehicle rear portion structure 121 of the second comparative example. As shown in FIG. 6, a pair of left and right side gussets 124 are provided at the rear portion 120 </ b> A of the vehicle 120 on both sides of the rear wall surface of the lower back panel 102 in the vehicle width direction. The side gusset 124 is made of a substantially rectangular plate-like member when viewed from the rear of the vehicle, and has a shape in which a lower portion on the outer side in the vehicle width direction is cut away in an oblique direction. The outer shape of the side gusset 124 is formed so as to be larger in the vehicle width direction inner side and the vehicle lower side than the outer shape of the side gusset 26 (see FIG. 2) of the present embodiment. That is, the inner end 124 </ b> A of the side gusset 124 extends inward in the vehicle width direction of the lower back panel 102, and the lower end 124 </ b> B of the side gusset 124 extends to the vicinity of the lower end of the lower back panel 102.

  In the vehicle rear structure 121, the side gusset 124 is increased in size toward the inner side in the vehicle width direction and the lower side of the vehicle in order to improve rigidity, which increases the weight of the vehicle body and the cost.

  On the other hand, in the vehicle rear portion structure 11 of the present embodiment, the side gusset 26 covers the mating surface between the flange portions 14A and 14B of the rear side member 14 and the outer vertical wall portion 16C of the lower back panel 16, and also crash box. After securing the mounting surface of the 28 mounting portions 30, it is shaped so as not to extend to the vehicle width direction inner side and the vehicle lower side. That is, in the side gusset 26, the outer end portion 26 </ b> A is joined to a part of the mating surface between the bent portion 20 </ b> A of the quarter panel 20 and the outer vertical wall portion 16 </ b> C of the lower back panel 16, and the upper end portion 26 </ b> B is connected to the lower back panel 16. It has a minimum outer shape that is joined to a part of the mating surface between the outer vertical wall portion 16C and the lower end portion 18D of the lower back reinforcement 18. Thereby, the increase in the mass of the side gusset 26 can be suppressed, the mass efficiency can be increased, and the high torsional rigidity of the rear portion 10A of the vehicle 10 can be ensured with light weight.

  Furthermore, in the vehicle rear structure 11 of the present embodiment, the side gussets 26 are provided on both sides of the lower back panel 16 in the vehicle width direction, thereby eliminating the center gusset or reducing the plate thickness of the lower back panel 16 and the lower back reinforcement 18. It becomes possible to reduce. For this reason, weight reduction is realizable, ensuring the high torsional rigidity of 10 A of rear parts of the vehicle 10. FIG.

  In addition, the welding surface of the lower back panel 16 and the side gusset 26 in a longitudinal sectional view can be unified for all platforms so that the welding surface of the lower back panel 16 and the side gusset 26 is substantially the same surface without offset in the vehicle longitudinal direction. The shape of the gusset can be shared. As a result, the mold cost of the side gusset 26 can be reduced, the equipment for assembling the lower back panel 16 can be simplified, and further cost reduction can be achieved.

  Further, in the vehicle rear structure 11 of the present embodiment, the lower back panel is configured such that the welded surface of the lower back panel 16 and the side gusset 26 in a longitudinal sectional view is substantially the same surface with no offset in the vehicle front-rear direction. 16 and the side gusset 26 can be easily formed, making it easy to manufacture and reducing the processing cost.

  In the vehicle rear structure 11 of the present embodiment, the side gusset 26 is disposed so that the outer end portion 26A covers a part of the mating surface between the lower back panel 16 and the bent portion 20A of the quarter panel 20. The intermediate portion in the vertical direction covers a part of the mating surface of the outer vertical wall portion 16C of the lower back panel 16 and the bent portion 12C of the rear floor panel 12 and the bent portion 22A of the rear floor side panel 22, and the upper end portion 26B is the lower back panel. Although it arrange | positions so that a part of mating surface of 16 and the lower end part 18D of the lower back reinforcement 18 may be covered, it is not limited to this. That is, the side gusset 26 is arranged so as to cover a part of the mating surface between the lower back panel 16 and the bent portion 20A of the quarter panel 20, and the lower back portion 18D of the lower back panel 16 and the lower back reinforcement 18. The structure provided with either one of the structures arrange | positioned so that a part of mating surface may be covered.

10 vehicle 10A rear part 11 vehicle rear part structure 12 rear floor panel (rear floor)
12C Bend (Mating surface with lower back)
14 Rear side members 14A, 14B Flange (joint surface)
16 Lower back panel (lower back)
16C Outside vertical wall (vehicle rear side)
18 Lower back reinforcement 18D Lower end (mating surface with lower back)
20 Quarter panel 20A Bent part (mating surface with lower back)
22 Rear floor side panel (rear floor)
22A Bent part (mating surface with lower back)
26 Side gusset (gusset)

Claims (5)

A rear floor provided at the rear of the vehicle and extending along the vehicle longitudinal direction and the vehicle width direction;
A pair of rear side members disposed on both sides of the rear floor in the vehicle width direction and extending along the vehicle longitudinal direction;
A lower back that extends from the rear end of the rear floor in the vehicle front-rear direction toward the vehicle upper side and to which the rear end of the rear side member in the vehicle front-rear direction is joined.
A lower back reinforcement which is disposed on an upper portion of the lower back and forms a closed cross-section with the lower back;
A quarter panel provided at both ends in the vehicle width direction of the rear portion of the vehicle and extending along the vehicle front-rear direction, the rear end portion being joined to the vehicle width direction end portion of the lower back;
A gusset that is disposed on the vehicle rear surface of the lower back so as to cover the joint surface between the rear side member and the lower back when viewed from the rear of the vehicle, and is formed so as to be substantially the same surface with no offset in the longitudinal direction of the vehicle when viewed from the longitudinal section. When,
A vehicle rear structure having:   The vehicle rear structure according to claim 1, wherein the gusset is disposed so as to cover at least a part of a mating surface between the rear side member and the lower back to a part of a mating surface between the quarter panel and the lower back.   The vehicle rear portion structure according to claim 1 or 2, wherein the gusset is disposed so as to cover a part of a mating surface between the lower back and the rear floor.   The vehicle rear structure according to claim 1 or 3, wherein the gusset is arranged so as to cover a part of a mating surface between the lower back and the lower back reinforcement.   The vehicle rear portion structure according to any one of claims 1 to 4, wherein the gusset has a cross-section along the vehicle width direction that is substantially the same plane.

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