JP2012224279A - Vehicle rear structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle rear structure which suppresses deformation in the vehicle longitudinal direction of a closed cross section surface of a lower back panel with respect to a rear floor side member at the traveling of a vehicle and improves NV performance.SOLUTION: The lower back panel 18 is arranged along the vehicle vertical direction on the rear side of the rear floor side member 14 etc. on a rear part 10A of the vehicle 10 and a bumper arm 22 is joined on the vehicle rear side via the lower back panel 18 etc. A lower back reinforce 30 is joined to an upper part 18C of the lower back panel 18 and the closed cross section surface 31 is constituted between the lower back reinforce and the lower back panel 18. A gusset 50 is laid between the bumper arm 22 and the closed cross section surface 31 of the lower back panel 18. On attachment parts 50D etc. of an upper part of the gusset 50, cutoff parts 52 for releasing the connection with the lower back panel 18 accompanied by the deformation of the bumper arm 22 at the collision from the vehicle rear side are disposed.

Description

  The present invention relates to a vehicle rear structure.

  In the following Patent Document 1, a lower back reinforcement is provided on the vehicle front side of the lower back panel, and the lower gusset of the rear floor panel faces the lower back reinforcement and the rear floor side member outward in the vehicle width direction. A structure connected in an inclined direction is disclosed.

JP 2007-083840 A

  However, in Patent Document 1, the lower gusset of the rear floor panel connects the lower back reinforcement and the rear floor side member, and the structure between the upper portion of the lower back panel and the skeleton member in the vehicle front-rear direction. Has not been proposed. For example, when a closed cross section is formed by joining the upper part of the lower back panel and the lower back reinforcement on the upper side of the bumper arm arranged on the rear side of the rear floor side member, the lower floor side member is lowered with respect to the rear floor side member when the vehicle is running. There is a possibility that the closed cross section of the back panel is elastically deformed in the vehicle longitudinal direction, and there is room for improvement.

  In consideration of the above fact, the present invention suppresses elastic deformation of the closed cross section of the lower back panel in the vehicle front-rear direction with respect to the rear floor side member during traveling of the vehicle, and improves NV (noise and vibration) performance. The object is to obtain a vehicle rear structure that can be used.

  The vehicle rear structure according to the invention of claim 1 is joined to the rear end side of the rear floor side member extending along the vehicle front-rear direction at the vehicle rear portion, and extends along the vehicle vertical direction and the vehicle width direction. A lower cross-section is formed between the lower back panel, a bumper arm attached to the rear end side of the rear floor side member with the lower back panel sandwiched therebetween, and an upper portion of the lower back panel. Lower back reinforcement, bridged between the bumper arm and the closed cross section of the lower back panel, and when the bumper arm is deformed at the time of a collision from the rear side of the vehicle, the bumper arm and the closed cross section of the lower back panel And a connecting member having a release portion for releasing the connected state.

  According to a second aspect of the present invention, in the vehicle rear portion structure according to the first aspect, the connecting member and the bumper arm or the closed cross section of the lower back panel are fixed by a fastening portion, and the release portion is the connecting member. And is a fragile portion formed so that the fastening portion is detached from the connecting member in accordance with the deformation of the bumper arm at the time of a collision from the rear side of the vehicle.

  According to a third aspect of the present invention, in the vehicle rear portion structure according to the first aspect, the connection member includes a first connection portion that is bonded to the bumper arm and a second connection that is bonded to the closed cross-section portion of the lower back panel. The release part is an adhesive part that adheres the first connection part and the second connection part.

  According to a fourth aspect of the present invention, in the vehicle rear structure according to the first aspect, the release portion is at least between the connecting member and the bumper arm and between the connecting member and the closed cross-section portion of the lower back panel. It is an adhesive part that is provided on one side and bonds the two together.

  According to the first aspect of the present invention, the lower back panel that extends along the vehicle vertical direction and the vehicle width direction on the rear end side of the rear floor side member that extends along the vehicle front-rear direction at the rear of the vehicle. And a bumper arm is attached to the rear end side of the rear floor side member with the lower back panel interposed therebetween. A lower back reinforcement is joined to the upper part of the lower back panel to form a closed cross section, and a connecting member is bridged between the bumper arm and the closed cross section of the lower back panel. By this connecting member, it is possible to increase the rigidity of the closed cross-section portion of the lower back panel with respect to the skeleton in the vehicle front-rear direction composed of the bumper arm and the rear floor side member. For this reason, it is suppressed that the closed cross-section part of a lower back panel deform | transforms into a vehicle front-back direction with respect to a rear floor side member at the time of vehicle travel.

  In addition, the connecting member includes a release portion that releases the connection state between the bumper arm and the closed cross-section portion of the lower back panel, and the bumper arm and the lower back are moved by the release portion when the bumper arm is deformed in the event of a collision from the rear side of the vehicle. The connection state with the closed cross section of the panel is released. Thus, no load is transmitted from the bumper arm to the closed cross section of the lower back panel, and damage to the closed cross section of the lower back panel can be reduced.

  According to the second aspect of the present invention, the connecting member and the bumper arm or the closed cross section of the lower back panel are fixed by the fastening portion, and the connecting member is formed so that the fastening portion is detached from the connecting member. Is provided. As a result, when the bumper arm is deformed at the time of a collision from the rear side of the vehicle, the fastening portion is disengaged from the fragile portion of the connecting member, so that the connection state between the bumper arm and the closed cross section of the lower back panel is released. Thus, with a simple configuration, the rigidity of the closed cross-section portion of the lower back panel with respect to the skeleton in the vehicle front-rear direction composed of the bumper arm and the rear floor side member can be increased, and at the time of a collision from the vehicle rear side, The connection state with the closed cross section of the lower back panel can be released.

  According to the third aspect of the present invention, the connecting member includes a first connecting portion joined to the bumper arm, and a second connecting portion joined to the closed cross-sectional portion of the lower back panel. The connecting portion and the second connecting portion are bonded by an adhesive portion as a release portion. As a result, when the bumper arm is deformed at the time of a collision from the rear side of the vehicle, the bonded portion between the first connecting portion and the second connecting portion is peeled off, thereby releasing the connection state between the bumper arm and the closed cross-section portion of the lower back panel. Is done. For this reason, with a simple configuration, the rigidity of the closed cross-section portion of the lower back panel with respect to the skeleton in the vehicle front-rear direction composed of the bumper arm and the rear floor side member can be increased, and the first connection is made in the event of a collision from the vehicle rear side. The connection between the part and the second connecting part can be released.

  According to the fourth aspect of the present invention, at least one of the connection member and the bumper arm and between the connection member and the closed cross-sectional portion of the lower back panel is provided with an adhesive portion as a release portion that bonds them together. ing. As a result, when the bumper arm is deformed at the time of a collision from the rear side of the vehicle, the bonding portion is peeled off, so that the connection state between the bumper arm and the closed cross section of the lower back panel is released. For this reason, with a simple configuration, it is possible to increase the rigidity of the closed cross section of the lower back panel with respect to the skeleton in the vehicle longitudinal direction constituted by the bumper arm and the rear floor side member, and at the time of a collision from the vehicle rear side, The connection state with the closed cross section of the lower back panel can be released.

  According to the vehicle rear structure according to the present invention, it is possible to suppress the closed cross-section portion of the lower back panel from being deformed in the vehicle front-rear direction with respect to the rear floor side member during vehicle travel, and to improve the NV performance.

It is a perspective view which shows the structure of the vehicle rear part structure which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the vehicle rear part structure shown in FIG. It is a perspective view which shows the notch part which cancels | releases connection with the upper part of the gusset of the vehicle rear part structure shown in FIG. 1, and the closed cross-section part of a lower back panel. It is a perspective view which shows the structure of the vehicle rear part structure which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the vehicle rear part structure shown in FIG. It is a perspective view which shows the structure of the vehicle rear part structure which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view of the vehicle rear part structure shown in FIG. It is a longitudinal cross-sectional view which shows the structure of the vehicle rear part structure which concerns on a 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 perspective view showing the configuration of the vehicle rear structure according to this embodiment, and FIG. 2 is a longitudinal sectional view of the configuration of the vehicle rear structure according to this embodiment along the vehicle front-rear direction. Is shown. As shown in FIG. 2, the rear panel 10A of the vehicle 10 is provided with a floor panel 12 in a substantially horizontal direction on the vehicle lower side, and extends along the vehicle front-rear direction at the lower part of the floor panel 12. A rear floor side member 14 is disposed. The rear floor side member 14 has a substantially hat-shaped cross section along the vehicle width direction, and flange portions formed on both sides of the upper vehicle width direction are joined to the lower surface of the floor panel 12 by welding or the like. The rear floor side member 14 and the floor panel 12 form a closed cross section. Although illustration is omitted, the rear floor side member 14 is disposed on both sides of the rear portion 10A of the vehicle 10 along the vehicle front-rear direction.

  A rear-side rear side member 16 inserted inside the rear floor side member 14 is provided at the rear end of the rear floor side member 14 in the vehicle front-rear direction. The rear side rear member 16 is disposed on the vehicle upper side of the rear floor side member 14, and the rear floor side member 14 and the rear side rear side member 16 are fastened and fixed by a fastener 17.

  A bent portion 16 </ b> A bent to the vehicle lower side is formed at the rear end portion of the rear side rear member 16. A lower back panel 18 is disposed on the vehicle rear side of the rear side rear member 16 and extends upward in the vehicle vertical direction. The front wall surface of the lower portion 18A of the lower back panel 18 and the bent portion 16A of the rear rear side member 16 are arranged in a surface contact state. A flange portion 12A is formed at the rear end portion of the floor panel 12 so as to be bent toward the vehicle upper side, and the flange portion 12A is joined to the front wall surface of the lower back panel 18 by welding or the like.

  A bumper arm 22 is disposed on the rear side of the rear rear side member 16 with a lower portion 18A of the lower back panel 18 and a lower back side reinforcement 20 disposed on the rear side of the vehicle interposed therebetween. That is, the bumper arm 22 is provided at a position facing the rear floor side member 14 and the floor panel 12 in the vehicle front-rear direction with the lower portion 18A of the lower back panel 18 and the lower back side reinforcement 20 interposed therebetween.

  As shown in FIGS. 1 and 2, attachment portions 22 </ b> A are formed at the front end portion of the bumper arm 22 on the vehicle lower side and both sides in the vehicle width direction. The bent portion 16A of the rear side rear member 16, the lower portion 18A of the lower back panel 18, the lower back side reinforcement 20, and the mounting portion 22A of the bumper arm 22 are arranged in a surface contact state in order from the vehicle front side, and are fastened and fixed by a fastener 23. Has been. A bent portion 20A bent toward the vehicle rear side is provided at the upper end portion of the lower backside reinforcement 20, and the bent portion 20A is joined to the upper surface of the bumper arm 22 by welding or the like (see FIG. 2).

  The bumper arm 22 has a polygonal closed cross section, and concave portions 22B are formed on both sides in the vehicle width direction along the vehicle front-rear direction (see FIG. 1). The bumper arm 22 is disposed such that the longitudinal direction of the closed cross section is along the vehicle front-rear direction. Reinforcing members 24 that reinforce the mounting portions of the bumper arm 22 and the lower backside reinforcement 20 are provided on both the left and right sides of the front end portion of the bumper arm 22. Although not shown, the bumper arms 22 are provided on both sides of the rear portion 10 </ b> A of the vehicle 10.

  In the rear portion 10 </ b> A of the vehicle 10, the rear floor side member 14, the rear side rear side member 16, and the bumper arm 22 are configured to bear the axial load in the vehicle front-rear direction. In addition, the structure which attaches the bumper arm 22 to the back side rear side member 16 via the lower back panel 18 is not limited to the structure which interposes the lower back side reinforcement 20 like this embodiment, It can change suitably. . For example, the structure which does not interpose the lower backside reinforcement 20 may be sufficient.

  On the vehicle upper side of the lower portion 18A of the lower back panel 18 to which the bumper arm 22 and the lower backside reinforcement 20 are attached, an inclined portion 18B that is bent in an oblique direction so as to be an upward gradient on the vehicle rear side is formed. . An upper portion 18C of the lower back panel 18 on the upper side of the vehicle with respect to the inclined portion 18B is formed in a substantially hat-like cross section along the vehicle vertical direction, and an intermediate portion in the vehicle vertical direction protrudes toward the vehicle rear side. A flange portion 18D is formed at the upper end of the upper portion 18C of the lower back panel 18.

  A lower back reinforcement 30 having a substantially hat-shaped cross section is disposed on the vehicle front side of the upper portion 18C of the lower back panel 18. Flange portions 30A and 30B formed on the upper and lower sides of the lower back reinforcement 30 are arranged in surface contact with the flange portion 18D of the upper portion 18C of the lower back panel 18 and the vertical wall portion 18E on the upper side of the inclined portion 18B. Thus, the closed cross-section portion 31 is formed by the lower back reinforcement 30 and the upper portion 18 </ b> C of the lower back panel 18. The closed cross section 31 constitutes a skeleton member extending in the vehicle width direction.

  As shown in FIG. 2, a floor panel reinforcement 32 is provided between the upper surface portion of the floor panel 12 and the lower portion 18 </ b> A (lower side of the inclined portion 18 </ b> B) of the lower back panel 18 so as to rise upward on the vehicle rear side. Is over. Flange portions are formed on the front and rear of the floor panel reinforcement 32, and the flange portions are joined to the upper surface portion of the floor panel 12 and the front wall surface of the lower portion 18A of the lower back panel 18 by welding.

  A deck board 34 that is bent so as to form a predetermined space in the vehicle vertical direction and the vehicle front-rear direction is disposed on the vehicle upper side of the floor panel 12. The lower end portion 34 </ b> A of the deck board 34 is joined to the upper surface of the flange portion of the floor panel reinforcement 32. Further, a rear floor board 38 that extends in the vehicle front-rear direction and the vehicle width direction is attached to the upper side of the deck board 34 via the attachment member 36.

  Further, a bumper cover 40 is attached to a rear end portion of the vehicle 10 by a mounting member (not shown) so as to cover a closed section 31 formed by the bumper arm 22 and the lower back reinforcement 30 and the upper portion 18C of the lower back panel 18. It is attached (see FIG. 2).

  As shown in FIGS. 1 and 2, the rear portion 10 </ b> A of the vehicle 10 is connected to the closed cross-section portion 31 formed by the lower back reinforcement 30 and the upper portion 18 </ b> C of the lower back panel 18 and the upper portion of the bumper arm 22. Thus, the gusset 50 as a connecting member is bridged. The gusset 50 includes a connecting portion 50A having a substantially U-shaped cross section along the vehicle front-rear direction, and a mounting portion 50B in which a vehicle width direction central portion at the lower end of the connecting portion 50A is bent toward the vehicle rear side. And both left and right mounting portions 50C bent at both sides in the vehicle width direction of the lower end portion of the connecting portion 50A (in FIG. 1, the mounting portion on the outer side in the vehicle width direction is illustrated). Not)

  Further, as shown in FIGS. 2 and 3, the gusset 50 includes an attachment portion 50D in which a vehicle width direction central portion of the upper end portion of the connection portion 50A is bent obliquely upward on the vehicle rear side, and an upper end of the connection portion 50A. And both left and right mounting portions 50E that are bent at both sides in the vehicle width direction.

  As shown in FIGS. 1 and 2, the lower mounting portion 50 </ b> B and the left and right mounting portions 50 </ b> C of the gusset 50 are arranged in surface contact with the upper portion of the bumper arm 22 and joined by welding. Note that the lower mounting portion 50B and the left and right mounting portions 50C of the gusset 50 and the upper portion of the bumper arm 22 are not limited to welding, and may be bonded or bolted.

  As shown in FIGS. 2 and 3, the upper portion 18 </ b> C of the lower back panel 18 that constitutes the closed cross-section portion 31 is located at a position facing the upper surface of the bumper arm 22 from the rear end portion to the front end portion in the vehicle front-rear direction. An inclined surface 31A is formed so as to have a downward slope toward the front. A notch portion 52 as a weak portion that is notched so as to open to the vehicle rear side is formed in the attachment portion 50D and the left and right attachment portions 50E of the gusset 50. In the inclined surface 31A, three through holes 54 for fastening and fixing the attachment portion 50D of the gusset 50 and the attachment portions 50E on the left and right sides are formed. The mounting portion 50D and the left and right mounting portions 50E are disposed in surface contact with the inclined surface 31A of the lower back panel 18, and the position of the notch 52 and the position of the through hole 54 of the inclined surface 31A are matched. In this state, the bolts 56 are inserted into the notches 52 and the through holes 54 and screwed into the nuts 58 so that the upper mounting portions 50D and the left and right mounting portions 50E of the gusset 50 are connected to the lower back panel 18. It is fastened and fixed to the inclined surface 31A (see FIG. 2).

  In the present embodiment, the gusset 50 is formed such that the angle between the connecting portion 50A and the lower mounting portion 50B is larger than the angle between the connecting portion 50A and the upper mounting portion 50D ( (See FIG. 2).

  As a result, the gusset 50 has the connecting portion 50 </ b> A descending from the inclined surface 31 </ b> A toward the bumper arm 22 toward the rear of the vehicle between the inclined surface 31 </ b> A of the lower back panel 18 constituting the closed section 31 and the upper portion of the bumper arm 22. It is bridged diagonally so as to form a gradient. Due to this gusset 50, when the vehicle is traveling, a closure formed by the upper portion 18 </ b> C of the lower back panel 18 and the lower back reinforcement 30 with respect to the skeleton in the vehicle longitudinal direction constituted by the floor panel 12, the rear floor side member 14 and the bumper arm 22. The cross section 31 is prevented from being deformed in the vehicle front-rear direction.

  Further, by providing the notch portions 52 in the mounting portion 50D and the left and right mounting portions 50E, when the bumper arm 22 is compressed and deformed during a collision from the rear portion 10A side of the vehicle 10, the mounting portion 50D of the gusset 50 and the left and right mounting portions 50E is configured to come out (disengage) from the bolt 56 and nut 58 (fastening portion) fastened to the through hole 54 of the inclined surface 31A to the vehicle front side.

  Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 1 and FIG. 2, a bumper arm 22 is disposed on the vehicle rear side of the rear rear side member 16 joined to the vehicle rear side of the rear floor side member 14 via a lower back panel 18 and a lower back side reinforcement 20. Is attached. A closed section 31 is formed by the upper portion 18C of the lower back panel 18 and the lower back reinforcement 30 on the vehicle upper side of the bumper arm 22, and the inclined surface 31A of the lower back panel 18 and the bumper arm constituting the closed section 31 are formed. A gusset 50 is bridged between the upper part of 22. By this gusset 50, the coupling rigidity of the portion connecting the vehicle front-rear frame composed of the bumper arm 22, the rear floor side member 14 and the rear rear side member 16 and the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 is increased. be able to.

  Thereby, it is possible to suppress the deformation of the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 with respect to the skeleton in the vehicle front-rear direction constituted by the bumper arm 22 and the rear floor side member 14 and the like during vehicle travel. For example, when a vehicle vertical load is input to a suspension support portion (not shown) of the vehicle 10 while the vehicle is running and the rear portion of the rear floor side member 14 vibrates in the vehicle vertical direction, the upper portion 18C of the lower back panel 18 and the lower It can suppress that the closed cross-section part 31 formed with the back reinforcement 30 deform | transforms in the vehicle front-back direction. Thereby, NV performance and steering stability at the time of driving | running | working of the vehicle 10 can be improved with a simple structure.

  Further, as shown in FIGS. 2 and 3, a notch portion 52 is provided in the upper mounting portion 50D and the left and right mounting portions 50E of the gusset 50, and the notch portion 52 and the inclined surface 31A pass through. By screwing the bolt 56 and the nut 58 so as to pass through the hole 54, the mounting portion 50D of the gusset 50 and the left and right mounting portions 50E are fastened and fixed to the inclined surface 31A of the lower back panel 18 (fastening). Part). When the bumper arm 22 is compressed and deformed at the time of a collision from the rear portion 10A side of the vehicle 10 by providing the notch portions 52 in the attachment portion 50D of the gusset 50 and the attachment portions 50E on the left and right sides, the attachment portion 50D of the gusset 50 and the left and right sides The mounting portion 50E comes out (disengages) from the bolt 56 and nut 58 of the through hole 54 of the inclined surface 31A toward the vehicle front side. That is, the attachment portion 50D of the gusset 50 and the attachment portions 50E on the left and right sides are separated from the fastening portion of the inclined surface 31A of the lower back panel 18. As a result, the connection state between the bumper arm 22 and the inclined surface 31A of the lower back panel 18 by the gusset 50 is released, and the load transmission path is interrupted. For this reason, the load is not transmitted from the bumper arm 22 to the closed cross-sectional portion 31 of the lower back panel 18, and damage to the closed cross-sectional portion 31 of the lower back panel 18 can be reduced.

  In the present embodiment, the separation load of the notch 52 of the gusset 50 can be controlled by the fastening torque of the bolt 56.

  FIG. 8 shows a rear portion 200A of the vehicle 200 to which the vehicle rear portion structure according to the comparative example is applied. In the rear portion 200 </ b> A of the vehicle 200, no connecting member is provided between the lower back panel 18 constituting the closed cross-section portion 31 and the upper portion of the bumper arm 22. In this structure, when the vehicle 200 is traveling, the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 is offset with respect to the skeleton in the vehicle longitudinal direction composed of the bumper arm 22 and the rear floor side member 14 and the like. With the vicinity of the inclined portion 18B of the lower back panel 18 as a base point, the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 easily falls down in the vehicle front-rear direction.

  On the other hand, in the rear portion 10A of the vehicle 10 of the present embodiment, the gusset 50 is bridged between the inclined surface 31A of the lower back panel 18 constituting the closed section 31 and the upper portion of the bumper arm 22. It is possible to prevent the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 from being deformed with respect to the skeleton in the vehicle front-rear direction formed by the bumper arm 22 and the rear floor side member 14 and the like during 10 travels.

  Next, a second embodiment of the vehicle rear structure according to the present invention will be described with reference to FIGS. 4 and 5. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 4 and 5, the rear section 70 </ b> A of the vehicle 70 is connected to the bumper arm 22 and the closed cross-section portion 31 formed by the lower back reinforcement 30 and the upper portion 18 </ b> C of the lower back panel 18. A gusset 72 as a connecting member is bridged. The gusset 72 includes a lower first connecting portion 74 joined to the upper surface of the bumper arm 22 and an upper second connecting portion 76 joined to the inclined surface 31A of the closed cross-sectional portion 31 of the lower back panel 18. I have. An attachment portion 50B and an attachment portion 50C that are bent toward the vehicle rear side are provided at the lower end portion of the first connecting portion 74, and the attachment portion 50B and the attachment portion 50C are joined to the upper surface of the bumper arm 22 by welding. . At the upper end portion of the second connecting portion 76, there are provided mounting portions 76A bent toward the rear side of the vehicle (the mounting portions bent toward both sides in the vehicle width direction are not shown), and the mounting portion 76A is closed cross section. It joins to the inclined surface 31A of the part 31 by welding.
Note that the mounting portion 50B, the mounting portion 50C, the bumper arm 22, the mounting portion 76A, and the inclined surface 31A of the closed cross-sectional portion 31 are not limited to welding, and may be bonded or bolted.

  The lower end portion of the second connecting portion 76 is overlaid on the upper end portion of the first connecting portion 74, and the upper end portion of the first connecting portion 74 and the lower end portion of the second connecting portion 76 serve as a release portion. Glued at 78 (see FIG. 5). That is, the gusset 72 is composed of two parts divided into a first connecting portion 74 and a second connecting portion 76, and the first connecting portion 74 and the second connecting portion 76 are bonded at an intermediate portion of the gusset 72. Bonded at the portion 78. For the bonding portion 78, a structural adhesive generally used in vehicles is used. That is, when a force in a direction in which the upper end portion of the first connecting portion 74 and the lower end portion of the second connecting portion 76 are separated from each other at the time of a collision from the rear side of the vehicle 70, the adhesive portion 78 is peeled off. Such an adhesive is used.

  In such a vehicle rear structure, a gusset 72 is bridged between the inclined surface 31A of the lower back panel 18 constituting the closed cross section 31 and the upper portion of the bumper arm 22, and the gusset 72 is connected to the first connecting portion 74. The upper end portion of the second connecting portion 76 and the lower end portion of the second connecting portion 76 are bonded together by an adhesive portion 78. As a result, the adhesive portion 78 receives a load in the shearing direction as indicated by the arrow A for the falling deformation of the upper portion 18C of the lower back panel 18 that may occur during vehicle travel, thereby increasing the coupling rigidity. it can. For this reason, it is possible to suppress the deformation of the closed cross-sectional portion 31 of the upper portion 18C of the lower back panel 18 with respect to the skeleton in the vehicle front-rear direction formed by the bumper arm 22 and the rear floor side member 14 and the like during vehicle travel. Therefore, the NV performance and the steering stability during travel of the vehicle 10 can be improved with a simple configuration.

  Further, when the bumper arm 22 is compressed and deformed at the time of a collision from the rear portion 70 </ b> A side of the vehicle 70, the first connecting portion 74 of the gusset 72 moves to the vehicle front side, and the bonding portion 78 receives a load in the peeling direction. Becomes easy to peel off. As a result, the first connecting portion 74 and the second connecting portion 76 constituting the gusset 72 are disconnected (the connection between the first connecting portion 74 and the second connecting portion 76 is released), and the lower back panel 18 is removed from the bumper arm 22. No load is transmitted to the closed cross-sectional portion 31. For this reason, damage to the closed cross section 31 of the lower back panel 18 can be reduced.

  Next, a third embodiment of the vehicle rear structure according to the present invention will be described with reference to FIGS. 6 and 7. In addition, about the same component as 1st and 2nd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the rear section 90 </ b> A of the vehicle 90 is connected to the bumper arm 22 and the closed cross-section portion 31 formed by the lower back reinforcement 30 and the upper portion 18 </ b> C of the lower back panel 18. A gusset 92 as a connecting member is bridged. The gusset 92 includes a connecting portion 92A having a substantially U-shaped cross section, a mounting portion 50B at the center in the vehicle width direction and a mounting portion 50C on both sides in the vehicle width direction provided at the lower end of the connecting portion 92A. (In FIG. 6, the mounting portion on the outer side in the vehicle width direction is not shown). Further, the gusset 92 includes a mounting portion 92B in which a vehicle width direction center portion of the upper end portion of the connecting portion 92A is bent toward the vehicle rear side, and both vehicle width direction sides of the upper end portion of the connecting portion 92A are bent to both sides in the vehicle width direction. And left and right mounting portions (not shown).

  The attachment portion 50B and the attachment portion 50C of the gusset 92 are bonded to the upper surface of the bumper arm 22 by an adhesive portion 94. The attachment portion 92B of the gusset 92 and the attachment portions (not shown) on both the left and right sides are bonded to the inclined surface 31A of the lower back panel 18 constituting the closed section 31 by an adhesive portion 96. For the bonding portions 94 and 96, a structural adhesive generally used in vehicles is used.

  In such a vehicle rear structure, a gusset 92 is bridged between the inclined surface 31A of the lower back panel 18 constituting the closed section 31 and the upper portion of the bumper arm 22, and the bumper arm 22 and the rear floor side member are traveled when the vehicle is traveling. It is possible to suppress the upper portion 18C of the lower back panel 18 from falling and deforming with respect to the skeleton in the vehicle longitudinal direction constituted by 14 or the like.

  Further, when the bumper arm 22 is compressed and deformed at the time of a collision from the rear portion 90A side of the vehicle 90, the attachment portion 50B of the gusset 92 and the attachment portion 50C of the attachment portion 50C and the upper surface of the bumper arm 22, or the attachment portion 92B of the gusset 92 and both left and right sides The adhesive portion 96 between the mounting portion (not shown) and the inclined surface 31A of the lower back panel 18 is peeled off. That is, the gusset 92 is detached from the upper surface of the bumper arm 22 or the inclined surface 31 </ b> A of the lower back panel 18. In the present embodiment, when the bumper arm 22 is compressed and deformed, the attachment portion 50B of the gusset 92 and the adhesive portion 94 between the attachment portion 50C and the bumper arm 22 are connected to the attachment portion 92B of the gusset 92 and the inclined surface 31A of the lower back panel 18. It is easier to peel off than the adhesive part 96. As a result, the connection state between the bumper arm 22 and the inclined surface 31 </ b> A of the lower back panel 18 by the gusset 92 is released, and no load is transmitted from the bumper arm 22 to the closed cross section 31 of the lower back panel 18. For this reason, damage to the closed cross section 31 of the lower back panel 18 can be reduced.

  In the first embodiment, the notch portion 52 for releasing the connection with the inclined surface 31A of the lower back panel 18 is provided in the attachment portions 50D and 50E on the upper side of the gusset 50. However, the present invention is not limited to this. In addition, a notch for releasing the connection with the bumper arm 22 may be provided in the attachment portion on the lower side of the gusset 50. In this case, for example, a notch portion is provided in the mounting portion of the gusset so as to open to the front side of the vehicle so that the fastening portion with the gusset is pulled out (disengaged) to the front side of the vehicle as the bumper arm 22 is compressed and deformed. Is preferred.

  Moreover, in 1st Embodiment, although the notch part 52 was provided in the attaching parts 50D and 50E of the upper side of the gusset 50, it is not limited to this, It is good also as a weak part partly connected by the thin part. That is, it is only necessary that the fastening portion is disengaged by the fragile portion of the connecting member in accordance with the deformation of the bumper arm at the time of a collision from the rear side of the vehicle.

  In the third embodiment, the upper end and the lower end of the gusset 92 are bonded by the bonding portions 94 and 96 as release portions, but a configuration in which an adhesive portion is provided on at least one of the upper end and the lower end of the gusset may be used.

  In the first to third embodiments, the rear floor side member 14, the rear side rear side member 16, and the like and the floor panel 12 form a closed section, but the present invention is not limited to this, and other configurations may be used. For example, the rear side member may be composed of one part.

DESCRIPTION OF SYMBOLS 10 Vehicle 10A Rear part 14 Rear floor side member 16 Back side rear side member 18 Lower back panel 18C Upper part 22 Bumper arm 30 Lower back reinforcement 31 Closed cross-section part 50 Gusset (connection member)
52 Notch (fragile)
56 bolts (fastening part)
58 Nut (fastening part)
70 vehicle 70A rear part 72 gusset (connection member)
74 1st connection part 76 2nd connection part 78 Bonding part (release part)
90 vehicle 90A rear part 92 gusset (connection member)
94 Bonding part (release part)
96 Bonding part (release part)

Claims (4)

A lower back panel joined to the rear end side of the rear floor side member extending along the vehicle front-rear direction at the rear of the vehicle, and extending along the vehicle vertical direction and the vehicle width direction;
A bumper arm attached to the rear end side of the rear floor side member with the lower back panel interposed therebetween;
Lower back reinforcement joined to the upper part of the lower back panel and forming a closed cross-section with the lower back panel;
It is bridged between the bumper arm and the closed cross section of the lower back panel, and the connection state between the bumper arm and the closed cross section of the lower back panel is released along with the deformation of the bumper arm at the time of collision from the rear side of the vehicle. A connecting member provided with a release portion to perform,
A vehicle rear structure having: The connecting member and the bumper arm or the closed cross section of the lower back panel are fixed by a fastening portion,
The said cancellation | release part is a weak part formed in the said connection member so that the said fastening part might remove | deviate from the said connection member with the deformation | transformation of the said bumper arm at the time of the collision from the vehicle rear side. Vehicle rear structure. The connecting member includes a first connecting portion joined to the bumper arm, and a second connecting portion joined to a closed cross-sectional portion of the lower back panel,
The vehicle rear portion structure according to claim 1, wherein the release portion is an adhesive portion that bonds the first connecting portion and the second connecting portion.   2. The release portion is an adhesive portion that is provided between at least one of the connection member and the bumper arm and between the connection member and a closed cross-section portion of the lower back panel, and bonds the two together. Vehicle rear structure.

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