Vehicle body rear portion structure
A vehicle body rear portion includes a floor tunnel, a unit protection cover, and a rear floor panel. The floor tunnel is arranged at a middle in a vehicle width direction of a front floor panel. The unit protection cover covers an upper portion of a protection target unit which is arranged at a rearward position of the floor tunnel. The rear floor panel is arranged at a rearward position of the protection target unit. The unit protection cover and the rear floor panel include a reinforcement structure portion that extends in a vehicle body rearward direction from a tunnel ridge line at right and left upper portions of the floor tunnel.
1. A vehicle body rear portion structure comprising:
a floor tunnel that is arranged at a middle in a vehicle width direction of a front floor panel;
a unit protection cover that covers an upper portion of a protection target unit which is arranged at a rearward position of the floor tunnel; and
a rear floor panel that is arranged at a rearward position of the protection target unit,
wherein a front edge portion of the rear floor panel and a rear edge portion of the front floor panel are fixed to the unit protection cover, and
wherein the unit protection cover and the rear floor panel comprise a reinforcement structure portion that extends in a vehicle body rearward direction from a tunnel ridge line at right and left upper portions of the floor tunnel and is continuously connected from the tunnel ridge line of the floor tunnel to a ridge line of the rear floor panel.
2. The vehicle body rear portion structure according to claim 1 ,
wherein a protrusion portion that rises upward and has right and left extension ridge lines each extending continuously in a vehicle body rearward direction from each of the right and left tunnel ridge lines is provided on a middle in the vehicle width direction of the unit protection cover and the rear floor panel, and
the reinforcement structure portion is constituted of the right and left extension ridge lines of the protrusion portion.
3. The vehicle body rear portion structure according to claim 2 ,
wherein the protrusion portion of the unit protection cover comprises a side wall that extends downward from each of the right and left extension ridge lines of the protrusion portion, and
the side wall is inclined outward in the vehicle width direction and downward from the extension ridge line of the protrusion portion.
4. The vehicle body rear portion structure according to claim 1 ,
wherein a rear cross member that extends along the vehicle width direction and is connected to a skeleton frame on vehicle body right and left sides is provided on the rear floor panel, and
the reinforcement structure portion extends to a position that intersects the rear cross member.
5. A vehicle body rear portion structure, comprising:
a floor tunnel that is arranged at a middle in a vehicle width direction of a front floor panel;
a unit protection cover that covers an upper portion of a protection target unit which is arranged at a rearward position of the floor tunnel; and
a rear floor panel that is arranged at a rearward position of the protection target unit,
wherein the unit protection cover and the rear floor panel comprise a reinforcement structure portion that extends in a vehicle body rearward direction from a tunnel ridge line at right and left upper portions of the floor tunnel,
wherein a protrusion portion that rises upward and has right and left extension ridge lines each extending continuously in a vehicle body rearward direction from each of the right and left tunnel ridge lines is provided on a middle in the vehicle width direction of the unit protection cover and the rear floor panel,
wherein the reinforcement structure portion is constituted of the right and left extension ridge lines of the protrusion portion,
wherein at least a middle region in the vehicle width direction of the unit protection cover is formed to rise further upward than an upper surface of the floor tunnel, and
wherein the protrusion portion includes a front wall protrusion region that is formed on a front wall of the unit protection cover and an upper wall protrusion region that is formed on an upper wall of the unit protection cover.
6. The vehicle body rear portion structure according to claim 5 ,
wherein an outer end portion in the vehicle width direction at a rear of the front floor panel is connected to a skeleton frame on vehicle body right and left sides that extends along a vehicle body forward-rearward direction,
a rear edge portion of the front floor panel includes a standing wall that stands upward and a step wall that is bent and extends rearward from an upper end portion of the standing wall,
a rear end portion of the floor tunnel is joined to the standing wall of the front floor panel, and
the step wall is arranged at a position adjacent to an outside in the vehicle width direction of the front wall protrusion region of the unit protection cover.
7. The vehicle body rear portion structure according to claim 6 ,
wherein a patch member that extends from an outer end portion in the vehicle width direction to a vicinity of the front wall protrusion region is joined to a surface on an opposite side of a vehicle room side of the step wall and the standing wall of the front floor panel.
8. The vehicle body rear portion structure according to claim 7 ,
wherein a pair of joint flanges that are joined to the standing wall of the front floor panel located at right and left positions of the floor tunnel are provided on a rear end portion of the floor tunnel, and
each of the joint flanges is welded to the standing wall and the patch member in a triplicated manner.
9. The vehicle body rear portion structure according to claim 8 ,
wherein an intersection ridge line that extends along the vehicle width direction between the pair of joint flanges is provided on a rear end portion of the floor tunnel.