Patent ID: 8469417

Claim:
A bumper structure ( 10 ) for a motor vehicle comprising: at least two polymeric crash boxes ( 30 ); a cross member which extends between said at least two polymeric crash boxes ( 30 ), wherein said cross member is a metallic cross member ( 20 ) adapted to support a compression force greater than 60000 N applied along a longitudinal direction ( 97 ) of said motor vehicle; and connection means ( 40 ) which extend between said metallic cross member ( 20 ) and a frame of said motor vehicle, said connection means ( 40 ) being plastically deformable under compression with a compression force greater than 500 N applied along said longitudinal direction thereby avoiding transmitting said compression stresses to said frame, wherein said metallic cross member ( 20 ) comprises at least an internal portion ( 27 ) that faces said at least two polymeric crash boxes ( 30 ) and has a plurality of protuberances ( 28 ).