JP6241423B2 - Vehicle rear structure - Google Patents

Description

  The present invention relates to a vehicle rear structure.

  Patent Document 1 below discloses a vehicle rear structure that absorbs collision energy at the time of a vehicle rear collision. The vehicle rear portion structure will be briefly described. A spare tire pan for accommodating a spare tire is formed on the rear floor panel, and the spare tire is inclined to the upper side of the vehicle as viewed from the side in the side view. In addition, a bracket for supporting the rear portion of the spare tire is provided on the lower side of the spare tire, and the bracket has a shape inclined to the front and is in surface contact with the disk surface of the wheel of the spare tire. Yes. Further, a bottom surface step portion is formed at the vehicle longitudinal direction intermediate portion of the spare tire pan.

  Then, at the time of the rear collision of the vehicle, the spare tire pan is bent so as to be convex upward from the bottom stepped portion, and the bracket moves to the front side of the vehicle. As a result, the rear portion of the spare tire is pushed out to the upper side of the vehicle by the bracket, and the rear portion (rear end portion) of the spare tire is raised to the upper side of the vehicle. As a result, the spare tire is prevented from being sandwiched between the cross member and the rear panel (lower back panel), and a stroke in the vehicle front-rear direction for absorbing the collision energy is secured.

JP 2009-184491 A JP-A-11-171048 Japanese Utility Model Publication No. 62-102783 JP-A-62-39376

  However, the vehicle rear structure has room for improvement in the following points. That is, in the vehicle rear structure, as described above, the rear portion of the spare tire is pushed out to the upper side of the vehicle only by the bracket, and the rear portion of the spare tire is raised to the upper side of the vehicle. For this reason, after the spare tire is pushed out by the bracket, the bracket does not contribute to the start-up of the spare tire. Therefore, there is room for improvement in order to more reliably start up the spare tire.

  In view of the above-described facts, an object of the present invention is to provide a vehicle rear structure that can more reliably raise a rear end portion of a spare tire at the time of a rear-end collision of the vehicle.

  The vehicle rear portion structure according to claim 1 forms a floor of the vehicle rear portion, forms a concave shape opened to the vehicle upper side and the vehicle rear side, and inclines toward the vehicle upper side as the bottom wall portion moves toward the vehicle rear side in a side view. A rear floor panel having a floor pan, a spare tire accommodated in the floor pan so as to be parallel to the bottom wall portion in a side view, and a rear end of the rear floor panel joined to the floor pan. A lower back panel that is closed from the rear side, and disposed on the vehicle lower side of the floor pan, extends in the vehicle front-rear direction in a side view, connects the lower back panel and the bottom wall portion, and A first bracket having a bent portion disposed on the vehicle lower side with respect to the rear portion, and bent so as to protrude upward from the bent portion at the time of rear-end collision; And is extended in the vertical direction of the vehicle in a side view, and is inclined to the front side of the vehicle as it goes to the lower side of the vehicle and disposed on the rear side of the rear end of the spare tire. And a bracket.

  In the vehicle rear structure according to the first aspect, the floor pan is formed on the rear floor panel constituting the floor of the vehicle rear. The floor pan has a concave shape opened to the vehicle upper side and the vehicle rear side, and the bottom wall portion of the floor pan is inclined to the vehicle upper side as it goes to the vehicle rear side in a side view. The spare tire is accommodated in the floor pan so as to be parallel to the bottom wall portion of the floor pan in a side view. That is, the spare tire is accommodated in the floor pan in a state where the spare tire is inclined to the upper side of the vehicle as viewed from the side. Further, a lower back panel is joined to the rear end portion of the rear floor panel, and the floor pan is closed from the rear side of the vehicle by the lower back panel.

  Here, a first bracket extending in the vehicle front-rear direction in a side view is disposed on the vehicle lower side of the floor pan, and the lower back panel and the bottom wall portion of the floor pan are connected by the first bracket. ing. The first bracket has a bent portion, and the bent portion is disposed on the vehicle lower side with respect to the rear portion of the spare tire. Then, when a collision load from the rear side of the vehicle is input to the lower back panel, the first bracket bends so as to protrude upward from the bent portion by the collision load. For this reason, the bent part pushes the bottom wall part of the floor pan and the rear part of the spare tire to the upper side of the vehicle, and the rear end part of the spare tire is raised to the upper side of the vehicle. At this time, the lower back panel is moved to the front side of the vehicle by the collision body from the rear side of the vehicle.

  Here, the second bracket is provided on the vehicle front side of the lower back panel. The second bracket extends in the vehicle vertical direction in a side view, and the lower end of the second bracket is inclined toward the vehicle front side toward the vehicle lower side, and the rear end portion of the spare tire is rearward of the vehicle. Arranged on the side. For this reason, when the second bracket moves to the vehicle front side as the lower back panel moves to the vehicle front side, the lower end portion of the second bracket enters the vehicle lower side of the rear end portion of the spare tire. Then, as the second bracket moves together with the lower back panel to the vehicle front side, the rear end portion of the spare tire is further lifted to the vehicle upper side along the inclined wall portion of the second bracket. As described above, according to the first aspect of the present invention, the rear end of the spare tire is pushed up by the first bracket, and the rear end of the spare tire is moved by the second bracket as the lower back panel moves toward the vehicle front side. Lift the part further up the vehicle. Accordingly, the rear end portion of the spare tire can be raised more reliably at the time of a rear collision of the vehicle.

  As described above, according to the vehicle rear portion structure of the present invention, the rear end portion of the spare tire can be more reliably raised at the time of a vehicle rear surface collision.

It is the typical sectional side view seen from the vehicle left side which shows the vehicle width direction center part of the rear part of the vehicle to which the vehicle rear part structure which concerns on this Embodiment was applied. It is the typical sectional side view seen from the vehicle left side which shows the state by which the rear-end part of the spare tire was raised by the 1st bracket and the 2nd bracket at the time of the rear surface collision of a vehicle.

  Hereinafter, a vehicle V to which a vehicle rear structure S according to an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a schematic side sectional view of the rear portion of the vehicle V in the vehicle width direction as viewed from the left side of the vehicle. Note that an arrow FR appropriately shown in the drawings indicates the front side of the vehicle V, and an arrow UP indicates the upper side of the vehicle.

  As shown in this figure, the vehicle V includes a rear floor panel 10 constituting a rear floor of the vehicle V, and a lower back panel 40 joined to a rear end portion of the rear floor panel 10. Further, the vehicle V includes a first bracket 50 and a second bracket 60 for raising the rear end portion of the spare tire 16 to the upper side of the vehicle V at the time of a rear collision. Hereafter, each said structure is demonstrated.

  The rear floor panel 10 is made of a steel plate and is arranged with the plate thickness direction being the vehicle vertical direction. A floor pan 12 for accommodating a spare tire 16 is formed at a substantially central portion in the vehicle width direction of the rear floor panel 10, and the floor pan 12 is formed in a concave shape that bulges to the vehicle lower side. Open to the upper side and the rear side of the vehicle. Specifically, the bottom wall portion 12A of the floor pan 12 is inclined to the vehicle upper side as it goes to the vehicle rear side in a side sectional view. And the spare tire 16 is arrange | positioned substantially parallel to the bottom wall part 12A of the floor pan 12, and is hold | maintained by the holder 18 fixed to 12 A of bottom wall parts. Thereby, the spare tire 16 is accommodated in the floor pan 12 in a state where the spare tire 16 is inclined to the upper side of the vehicle as it goes to the rear side of the vehicle in a side sectional view.

  Further, a pair of left and right rear side members 20 constituting a skeleton member of the vehicle V are provided on the vehicle lower side of the rear floor panel 10 at positions on both sides of the floor pan 12 in the vehicle width direction. The rear side member 20 extends in the vehicle front-rear direction and is formed in a cross-sectional inverted hat shape that is open to the vehicle upper side. The rear floor panel 10 is joined to the opening end of the rear side member 20 by welding or the like. As a result, the rear side member 20 and the rear floor panel 10 form a closed cross section. The rear end portion of the rear side member 20 is joined to a bumper reinforcement 22 extending in the vehicle width direction, and the bumper reinforcement 22 is formed from the rear side of the vehicle by a bumper cover 24 that constitutes the rear end of the vehicle V. Covered.

  Further, a reinforcing portion 14 is formed at the front end portion of the rear floor panel 10. The reinforcing portion 14 is formed in a substantially hat-shaped cross section that is open to the vehicle lower side in a side sectional view and extends in the vehicle width direction. A rear floor cross member 26 extends in the vehicle width direction on the vehicle lower side of the reinforcing portion 14. The rear floor cross member 26 is formed in a substantially crank shape in a side sectional view so that a front end portion thereof is disposed above the rear end portion of the vehicle. A center floor panel 28 is provided on the front side of the rear floor panel 10 with the vehicle vertical direction being the plate thickness direction. The opening end portion on the vehicle front side of the rear floor cross member 26 is joined to the opening end portion on the vehicle front side of the reinforcing portion 14 by welding or the like via the rear end portion of the center floor panel 28. On the other hand, the vehicle rear side opening end portion of the rear floor cross member 26 is joined to the vehicle rear side opening end portion of the reinforcing portion 14. Thus, a closed cross section is formed by the rear floor cross member 26 and the rear floor panel 10, and the front end portion of the rear floor panel 10 is reinforced by the rear floor cross member 26. A fuel tank 30 is provided on the vehicle front side of the floor pan 12 on the vehicle lower side of the center floor panel 28.

  The lower back panel 40 is disposed with the vehicle front-rear direction as the plate thickness direction, and is disposed on the rear side of the rear floor panel. The lower back panel 40 is joined to the rear end portion of the rear floor panel 10 by welding or the like. As a result, the floor pan 12 is closed from the vehicle rear side by the lower back panel 40. Further, in this state, the lower end portion of the lower back panel 40 protrudes to the vehicle lower side than the rear end portion of the floor pan 12. Further, an attachment portion 42 is formed at the upper end portion of the lower back panel 40, and the attachment portion 42 bulges to the front side of the vehicle and has a substantially U shape opened to the rear side of the vehicle in a side sectional view. Is formed.

  The first bracket 50 is made of a steel plate and is arranged with the vehicle vertical direction as the plate thickness direction on the vehicle lower side of the rear portion of the floor pan 12. Further, the vehicle front-rear direction intermediate portion of the first bracket 50 is bent in a substantially crank shape in a side sectional view so that the rear end portion of the first bracket 50 is disposed on the vehicle upper side than the front end portion of the first bracket 50. ing. Specifically, the first bracket 50 includes a rear wall portion 52 that is disposed with the vehicle vertical direction approximately in the plate thickness direction, and an inclined wall that is inclined downward from the front end of the rear wall portion 52 toward the vehicle front side. Part 54 and a front wall part 56 extending from the front end of the inclined wall part 54 to the vehicle front side. That is, the boundary portion between the rear wall portion 52 and the inclined wall portion 54 is bent so as to protrude obliquely forward on the vehicle upper side in a side sectional view.

  Further, the rear end portion of the rear wall portion 52 is a rear-side joint portion 52A that is bent to the vehicle lower side, and the rear-side joint portion 52A is adjacent to the vehicle front side of the lower end portion of the lower back panel 40. Arranged and joined to the lower back panel 40 by welding or the like. Furthermore, the vehicle front side portion of the front wall portion 56 is bent in a substantially crank shape on the vehicle upper side in a side sectional view, and the front end portion of the front wall portion 56 is a front side joining portion 56A. The front side joining portion 56A is arranged in parallel to the floor pan 12 and adjacent to the vehicle lower side, and is a front portion of the bottom wall portion 12A of the floor pan 12 (specifically, a front half portion of the bottom wall portion 12A). Are joined by welding or the like. Thereby, the bottom wall portion 12 </ b> A of the floor pan 12 and the lower end portion of the lower back panel 40 are connected by the first bracket 50. And the boundary part of the rear wall part 52 and the inclination wall part 54 is made into the bending part 58 (It is an element grasped | ascertained as a "bending start part" in a broad sense). The bent portion 58 is disposed on the vehicle lower side of the rear portion of the spare tire 16 (the rear portion of the vehicle relative to the center line of the spare tire 16, specifically, the rear end portion of the spare tire 16). As will be described in detail later, when a collision load on the front side of the vehicle V is input to the first bracket 50 at the rear collision of the vehicle V, the first bracket 50 is bent convexly toward the upper side of the vehicle starting from the bent portion 58. It is comprised so that.

  The second bracket 60 is made of a steel plate and is disposed on the vehicle rear side of the spare tire 16 with the vehicle longitudinal direction being the plate thickness direction. The second bracket 60 includes a vertical wall portion 62 that extends in the vehicle vertical direction in a side sectional view, and an inclined wall portion 64 that projects from the lower end of the vertical wall portion 62 to the vehicle front side. The lower end portion of the second bracket 60 is configured by the inclined wall portion 64.

  And the upper end part of the vertical wall part 62 is arrange | positioned adjacent to the vehicle front side of the attaching part 42 of the lower back panel 40, and is joined to the attaching part 42 by welding etc. FIG. Accordingly, the inclined wall portion 64 is arranged to be separated from the vehicle front side of the lower back panel 40. In addition, the inclined wall portion 64 is inclined to the front side of the vehicle as it goes to the vehicle lower side in a side sectional view, and is curved so as to protrude obliquely downward on the rear side of the vehicle. The inclined wall portion 64 is disposed on the vehicle rear side with respect to the rear end portion of the spare tire 16, and the front end portion of the inclined wall portion 64 is close to the vehicle lower side with respect to the rear end portion of the spare tire 16. Are arranged.

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

  At the time of a rear collision of the vehicle V to which the vehicle rear structure S configured as described above is applied, a collision body (barrier) B (see FIG. 1) collides with the rear end of the vehicle V from the vehicle rear side. For this reason, the collision load to the front side of the vehicle is input to the bumper reinforcement 22 by the collision body B. Since the bumper reinforcement 22 is joined to the rear ends of the pair of left and right rear side members 20, the collision load is transmitted to the rear side member 20. Thereby, the rear side member 20 deform | transforms and the collision body B penetrate | invades into the vehicle front side. When the collision body B enters the vehicle front side, the bumper reinforcement 22 collides with the lower back panel 40, and a collision load on the vehicle front side is input to the lower back panel 40.

  Here, a first bracket 50 is provided on the vehicle lower side of the floor pan 12, and the first bracket 50 includes a lower end portion of the lower back panel 40 and a front portion of the bottom wall portion 12 </ b> A of the floor pan 12. It is connected. Further, a bent portion 58 is formed at the middle portion of the first bracket 50 in the vehicle front-rear direction. The bent portion 58 is bent so as to protrude obliquely forward on the vehicle upper side, and is disposed on the vehicle lower side of the rear end portion (rear portion) of the spare tire 16.

  For this reason, when the collision load input to the lower back panel 40 is transmitted from the lower back panel 40 to the rear end portion of the first bracket 50, the first bracket 50 moves the bent portion 58 as shown in FIG. Bends so that it protrudes upward from the starting point of the vehicle. The bent portion 58 hits the rear portion of the floor pan 12 due to the bending of the first bracket 50, and the bent portion 58 pushes up the rear portion of the floor pan 12 and the rear end portion of the spare tire 16. As a result, the rear end portion of the spare tire 16 is raised to the vehicle upper side, and the lower back panel 40 enters the vehicle front side together with the collision body B.

  Here, the second bracket 60 is provided on the vehicle front side of the lower back panel 40. And the inclined wall part 64 which comprises the lower end part of the 2nd bracket 60 is arrange | positioned in the vehicle rear side of the rear-end part of the spare tire 16, while it inclines in the vehicle front side as it goes to a vehicle lower side by side view. Yes. For this reason, when the second bracket 60 moves to the vehicle front side with the movement (intrusion) of the lower back panel 40 toward the vehicle front side, the tip end portion of the inclined wall portion 64 of the second bracket 60 becomes the rear end portion of the spare tire 16. Enter the lower side of the vehicle. Then, as the second bracket 60 moves to the vehicle front side together with the lower back panel 40, the rear end portion of the spare tire 16 is further lifted to the vehicle upper side along the inclined wall portion 64 of the second bracket 60 (see FIG. 2). . Thereby, the spare tire 16 is suppressed from being sandwiched between the rear floor cross member 26 and the collision body B. As a result, a stroke for deforming the rear side member 20 in the longitudinal direction of the vehicle is secured, and the collision energy from the collision body B can be absorbed by the deformation of the rear side member 20.

  As described above, according to the vehicle rear portion structure S of the present embodiment, the bent portion 58 of the first bracket 50 is bent so as to be convex toward the vehicle upper side at the rear collision of the vehicle V, and the bent portion is bent. 58, the rear end of the spare tire 16 is raised to the upper side of the vehicle. Further, the rear end portion of the spare tire 16 is further raised to the vehicle upper side by the second bracket 60 (the inclined wall portion 64 thereof) that moves to the vehicle front side as the collision body B enters the vehicle front side. Therefore, the rear end portion of the spare tire 16 can be raised more reliably at the time of the rear collision of the vehicle V.

  Further, by raising the rear end portion of the spare tire 16, the movement of the spare tire 16 toward the front side of the vehicle can be reduced. Thereby, since it is suppressed that the spare tire 16 hits the fuel tank 30, the harming property with respect to the fuel tank 30 can be reduced. Further, as described above, by securing a stroke for deforming the rear side member 20 in the vehicle front-rear direction, the collision energy is absorbed by the deformation of the rear side member 20, so that the passenger seated in the rear seat of the vehicle V Collision safety performance can be improved.

  Further, the second bracket 60 is configured separately from the lower back panel 40, and the upper end portion of the second bracket 60 is joined to the mounting portion 42 that protrudes from the lower back panel 40 toward the vehicle front side. Thereby, the inclined wall part 64 of the 2nd bracket 60 can be spaced apart and arrange | positioned with respect to the lower back panel 40 at the vehicle front side. As a result, it is possible to suppress the deformation of the second bracket 60 (the inclined wall portion 64 thereof) when the collision body B collides with the lower back panel 40 via the bumper reinforcement 22. Therefore, when the lower back panel 40 moves to the front side of the vehicle, the rear end portion of the spare tire 16 can be favorably lifted by the inclined wall portion 64 of the second bracket 60.

  In the present embodiment, the vehicle front-rear direction intermediate portion of the first bracket 50 is bent in a substantially crank shape, and the bent portion 58 is bent so as to protrude obliquely forward on the vehicle upper side. The shape of 50 is not limited to this. That is, when a collision load to the front side of the vehicle is input to the rear end portion of the first bracket 50, the bent portion 58 is bent so that the middle portion in the vehicle front-rear direction of the first bracket 50 is convex toward the vehicle upper side. Should just be formed. For example, the bent portion is formed by bending the vehicle front-rear direction intermediate portion of the first bracket 50 so that the entirety of the first bracket 50 is opened obliquely rearward on the vehicle lower side in a side sectional view. May be the bent portion 58.

  Further, in the present embodiment, the inclined wall portion 64 of the second bracket 60 is curved so as to protrude obliquely downward on the vehicle rear side in a side sectional view. Instead of this, the inclined wall portion 64 of the second bracket 60 may be linearly inclined toward the vehicle front side as it goes to the vehicle lower side in a side sectional view.

DESCRIPTION OF SYMBOLS 10 Rear floor panel 12 Floor pan 12A Bottom wall part 16 of floor pan Spare tire 40 Lower back panel 50 1st bracket 58 Bending part 60 2nd bracket 64 Inclined wall part (lower end part of 2nd bracket)
S Vehicle rear structure

Claims (1)

A rear floor panel having a floor pan that constitutes a floor at the rear of the vehicle, has a concave shape opened to the upper side of the vehicle and to the rear side of the vehicle, and the bottom wall portion is inclined to the upper side of the vehicle as viewed from the side,
A spare tire housed in the floor pan so as to be parallel to the bottom wall portion in a side view;
A lower back panel joined to a rear end portion of the rear floor panel and closing the floor pan from a vehicle rear side;
Arranged at the vehicle lower side of the floor pan and extended in the vehicle front-rear direction in a side view to connect the lower back panel and the bottom wall portion, and arranged at the vehicle lower side with respect to the rear portion of the spare tire A first bracket that has a bent portion and is bent so as to protrude upward from the bent portion at the time of a rear collision;
The vehicle is provided on the vehicle front side of the lower back panel, extends in the vehicle vertical direction in a side view, and is inclined toward the vehicle front side toward the vehicle lower side and the vehicle rear side of the rear end portion of the spare tire. A second bracket disposed on the
A vehicle rear structure comprising: