Vehicle underbody structure

Claim 1

A VEHICLE UNDERBODY FLOOR PAN ASSEMBLY COMPRISING A PASSENGER FLOOR PAN UNIT AND A REAR FLOOR PAN UNIT FORMING AN EXTENSION OF SAID PASSENGER FLOOR PAN UNIT, SAID PASSENGER COMPARTMENT FLOOR PAN UNIT COMPRISING A FORMED PANEL HAVING A DRIVE SHAFT TUNNEL FORMING A LONGITUDINAL STRUCTURAL MEMBER THEREOF, SAID REAR FLOOR PAN UNIT BEING PROVIDED WITH A PAIR OF SPACED CHANNEL SECTIONS FORMING LONGITUDINALLY EXTENDING SIDE RAILS, SAID SIDE RAILS TERMINATING BENEATH SAID FORMED PANEL INWARDLY OF THE REAR AND LATERAL EDGES OF THE LATTER AND IN PARALLEL SPACED RELATIONSHIP TO SAID DRIVE SHAFT TUNNEL, AND TORQUE BOX MEANS COUPLING SAID FLOOR PAN UNITS TOGETHER, SAID TORQUE BOX MEANS COMPRISING THE OUTER REAR CORNERS OF SAID FORMED PANEL, THE PARTS OF SAID SIDE RAILS EXTENDING THEREBENEATH, AND SHEET METAL MEMBERS ATTACHED THERETO TO COMPLETE STRUCTURAL BOX SECTIONS CONTIGUOUS TO SAID FORMED PANEL REAR CORNERS.