Automotive rear vehicle body structure

An automotive rear vehicle body structure having a sub frame supporting a pair of rear wheels disposed behind a pair of side sills on either side of a vehicle body, comprising:

• a pair of rear side frames extending rearwardly from the side sills on either side of the vehicle body;
• a rear floor panel extending between the rear side frames and bulging downward so as to define a spare tire pan;
• at least one rear center frame extending in a fore-and-aft direction along a lower wall of the spare tire pan;
• the rear center frame being disposed behind a sub frame member at a substantially same elevation as the sub frame member;
• and,
• a reinforcement member that connects a middle part of the rear center frame to the rear side frames.

An automotive rear vehicle body structure having a sub frame supporting a pair of rear wheels disposed behind a pair of side sills on either side of a vehicle body, comprising:

• a pair of rear side frames extending rearwardly from the side sills on either side of the vehicle body;
• a rear floor panel extending between the rear side frames and bulging downward so as to define a spare tire pan;
• and
• at least one rear center frame extending in a fore-and-aft direction along a lower wall of the spare tire pan;
• wherein the rear center frame is disposed behind a sub frame member at a substantially same elevation as the sub frame member, and wherein the sub frame comprises a torsion beam rear wheel suspension system, and the sub frame member comprises a torsion beam of the rear wheel suspension system.