Floor pan of a collecting tank for cooling water and heat exchangers for motor vehicles

The invention relates to a floor panel of a collecting tank for cooling water a heat exchanger which has along its longitudinal extension adjacently disposed passages may be arranged through which cooling water pipes, wherein the floor panel is characterized in that a reinforcing bead is arranged between two immediately adjacent rim holes and in that the floor panel is bent transversely to its longitudinal extension, whereby a substantially verwindungssteiferes floor panel is provided.