Bumper beam
The invention relates to a bumper beam (B) comprising a main cross member ( 1 ) and a cross member part ( 2 ) fixedly attached to said main cross member ( 1 ). Said cross member part ( 2 ) forms in itself or together with one or more portions of the main cross member ( 1 ) a closed chamber (C) in a cross section of the bumper beam and is arranged at an upper side ( 11 ) or at a lower side ( 12 ) of said main cross member ( 1 ). Said closed chamber (C) abuts and extends over only a portion of said upper side ( 11 ) or said lower side ( 12 ) of said main cross member ( 1 ) as seen in the cross direction of said main cross member ( 1 ) and over essentially the entire length and in a longitudinal direction of said main cross member ( 1 ). Said main cross member ( 1 ) together with said cross member part ( 2 ) form a closed main chamber (M).
1. A bumper beam (B) comprising a main cross member ( 1 ) and a cross member part ( 2 ) fixedly attached to said main cross member ( 1 ), wherein said cross member part ( 2 ) forms in itself or together with one or more portions of the main cross member ( 1 ) a closed chamber (C) in a cross section of the bumper beam, arranged at an upper side ( 11 ) or at a lower side ( 12 ), or both, of said main cross member ( 1 ), wherein said closed chamber (C) abuts and extends over only a portion of said upper side ( 11 ) or said lower side ( 12 ) of said main cross member ( 1 ) as seen in the cross direction of said main cross member ( 1 ) and over essentially the entire length and in a longitudinal direction of said main cross member ( 1 ), and that said main cross member ( 1 ) together with said cross member part ( 2 ) form a closed main chamber (M).
2. The bumper beam (B) according to claim 1 , wherein said closed chamber (C) is arranged proximate to a front surface ( 10 ) of said main cross member ( 1 ) and directed rearwardly.
3. The bumper beam (B) according to claim 2 , wherein said cross member part ( 2 ) is formed in one piece and totally covering the front surface ( 10 ) of the main cross member ( 1 ) both in horizontal and vertical direction.
4. The bumper beam (B) according to claim 1 , wherein said cross member part ( 2 ) is provided with at least one longitudinal depression ( 20 ) directed towards the main cross member ( 1 ), and that said main cross member ( 1 ) is provided with at least one corresponding longitudinal open channel or void ( 13 ).
5. The bumper beam (B) according to claim 1 , wherein said cross member part ( 2 ) comprises a pair of tongues ( 14 , 15 ), one of said tongues ( 14 ) attaching said cross member part ( 2 ) to the upper side ( 11 ) of the main cross member ( 1 ), another of said tongues ( 15 ) attaching said cross member part ( 2 ) to the lower side ( 12 ) of the main cross member ( 1 ), and that each of said tongues ( 14 , 15 ) abuts against a vertical surface of said cross member part ( 2 ).
6. The bumper beam (B) according to claim 1 , wherein said closed chamber (C) is provided with at least one longitudinal horizontal depression ( 26 ).
7. The bumper beam (B) according to claim 1 , wherein, when said closed chamber (C) is arranged at the lower side ( 12 ) of said main cross member ( 1 ), an upper portion of said least one cross member part ( 2 ) is provided with a vertical protruding tongue ( 21 ) extending above the upper side ( 11 ) of said main cross member ( 1 ).
8. The bumper beam (B) according to claim 1 , wherein said closed chamber (C) has rectangular form as seen in cross section.
9. The bumper beam (B) according to claim 1 , wherein said main cross member ( 1 ) is either roll-formed, cold-formed or hot-formed, and that said at least one cross member part ( 2 ) is roll-formed.
10. The bumper beam (B) according to claim 2 , wherein said cross member part ( 2 ) is provided with at least one longitudinal depression ( 20 ) directed towards the main cross member ( 1 ), and that said main cross member ( 1 ) is provided with at least one corresponding longitudinal open channel or void ( 13 ).
11. The bumper beam (B) according to claim 3 , wherein said cross member part ( 2 ) is provided with at least one longitudinal depression ( 20 ) directed towards the main cross member ( 1 ), and that said main cross member ( 1 ) is provided with at least one corresponding longitudinal open channel or void ( 13 ).
12. The bumper beam (B) according to claim 2 , wherein said cross member part ( 2 ) comprises a pair of tongues ( 14 , 15 ), one of said tongues ( 14 ) attaching said cross member part ( 2 ) to the upper side ( 11 ) of the main cross member ( 1 ), another of said tongues ( 15 ) attaching said cross member part ( 2 ) to the lower side ( 12 ) of the main cross member ( 1 ), and that each of said tongues ( 14 , 15 ) abuts against a vertical surface of said cross member part ( 2 ).
13. The bumper beam (B) according to claim 3 , wherein said cross member part ( 2 ) comprises a pair of tongues ( 14 , 15 ), one of said tongues ( 14 ) attaching said cross member part ( 2 ) to the upper side ( 11 ) of the main cross member ( 1 ), another of said tongues ( 15 ) attaching said cross member part ( 2 ) to the lower side ( 12 ) of the main cross member ( 1 ), and that each of said tongues ( 14 , 15 ) abuts against a vertical surface of said cross member part ( 2 ).
14. The bumper beam (B) according to claim 4 , wherein said cross member part ( 2 ) comprises a pair of tongues ( 14 , 15 ), one of said tongues ( 14 ) attaching said cross member part ( 2 ) to the upper side ( 11 ) of the main cross member ( 1 ), another of said tongues ( 15 ) attaching said cross member part ( 2 ) to the lower side ( 12 ) of the main cross member ( 1 ), and that each of said tongues ( 14 , 15 ) abuts against a vertical surface of said cross member part ( 2 ).
15. The bumper beam (B) according to claim 2 , wherein said closed chamber (C) is provided with at least one longitudinal horizontal depression ( 26 ).
16. The bumper beam (B) according to claim 3 , wherein said closed chamber (C) is provided with at least one longitudinal horizontal depression ( 26 ).
17. The bumper beam (B) according to claim 2 , wherein said closed chamber (C) has rectangular form as seen in cross section.
18. A bumper beam (B) comprising a main cross member ( 1 ) and a cross member part ( 2 ) fixedly attached to said main cross member ( 1 ), wherein said cross member part ( 2 ) forms in itself or together with one or more portions of the main cross member ( 1 ) a closed chamber (C) in a cross section of the bumper beam, arranged at an upper side ( 11 ) or at a lower side ( 12 ) of said main cross member ( 1 ), wherein said closed chamber (C) abuts and extends over only a portion of said upper side ( 11 ) or said lower side ( 12 ) of said main cross member ( 1 ) as seen in the cross direction of said main cross member ( 1 ) and over essentially the entire length and in a longitudinal direction of said main cross member ( 1 ), and that said main cross member ( 1 ) together with said cross member part ( 2 ) form a closed main chamber (M),
wherein said closed chamber (C) is arranged proximate to a front surface ( 10 ) of said main cross member ( 1 ) and directed rearwardly,
wherein said cross member part ( 2 ) is formed in one piece and totally covering the front surface ( 10 ) of the main cross member ( 1 ) both in horizontal and vertical direction, and
wherein said closed chamber (C) has rectangular form as seen in cross section.
19. The bumper beam (B) according to claim 2 , wherein said main cross member ( 1 ) is either roll-formed, cold-formed or hot-formed, and that said at least one cross member part ( 2 ) is roll-formed.
20. The bumper beam (B) according to claim 3 , wherein said main cross member ( 1 ) is either roll-formed, cold-formed or hot-formed, and that said at least one cross member part ( 2 ) is roll-formed.