Patent ID: 7438001
Filing Date: 2008-10-21
Classification: B61D

Abstract:
1. A car body structure comprising a roof construction or a side sill of an underframe having a higher rigidity at a longitudinal center portion of the car body structure than the rigidity of the other portions of the roof construction or the side sill, wherein the thickness of the roof construction at the longitudinal center portion of the car body structure facing an inner side of the car is increased by adhering a reinforcing plate to the roof construction facing the inner side of the car; the roof construction is a hollow extrusion; and the reinforcing plate is welded to a face plate of the hollow extrusion facing the inner side of the car, wherein the whole circumference of the reinforcing plate is attached by fillet welding, and the reinforcing plate is further attached by plug welding to a crossing point between a face plate of the hollow extrusion facing the inner side of the car and a connecting plate.