Motor vehicle bumper beam comprising a cross-member and a shock absorber

1. A bumper beam for motor vehicle comprising a cross-member and at least one shock absorber, both the cross-member and the shock absorber having an upper surface and a lower surface, wherein the bumper beam comprises an attachment element for attaching the cross-member to the shock absorber, the attachment element comprising at least two straps connecting the upper surfaces of the cross-member and the shock absorber and/or the lower surfaces of the cross-member and the shock absorber, the at least two straps being at least partially separated from each other, and distributed in the transverse direction, each encircling the cross-member locally.

2. The bumper beam according to claim 1 , wherein at least one of the at least two straps connects the lower surface and the upper surface of the shock absorber, and is in front of the cross-member.

3. The bumper beam according to claim 1 , wherein the at least two straps are connected together by bridges, themselves separated from each other.

4. The bumper beam according to claim 1 , wherein at least one of the at least two straps is continuous over the width of the shock absorber.

5. The bumper beam according to claim 1 , wherein both the cross-member and the shock absorber have a lateral surface, the attachment element further comprising a lateral belt connecting the lateral surfaces of the cross-member and the shock absorber.

6. The bumper beam according to claim 5 , wherein the lateral belt forms a lateral flank entirely covering the lateral surfaces of the cross-member and the shock absorber.

7. The bumper beam according to claim 1 , wherein the shock absorber is of a substantially parallelepipedic shape, having an attachment plate, intended to rest against a longitudinal beam of the motor vehicle, the attachment element being attached to this attachment plate.

8. The bumper beam according to claim 1 , wherein the attachment element is made in one piece with the shock absorber.

9. The bumper beam according to claim 1 , wherein the attachment element is obtained by overmoulding the cross-member.

10. The bumper beam according to claim 1 , wherein the attachment element is made of metal or metal/plastic hybrid.

11. The bumper beam according to claim 1 , forming a front or rear shock module and further providing one or more of the functions chosen from the group consisting of a lower protection beam for pedestrian, an attachment for a vehicle component, a roof stiffener or a wing stiffener.

12. The bumper beam according to claim 1 , wherein the cross-member is a profile having a cross-section of constant shape.

13. A method for manufacturing a bumper beam for a motor vehicle, the method comprising a step of overmolding an attachment element on a cross member and at least one shock absorber, the bumper beam having the cross-member and the at least one shock absorber, both the cross-member and the shock absorber having an upper surface and a lower surface, wherein the bumper beam has the attachment element for attaching the cross-member to the shock absorber, the attachment element comprising at least two straps connecting the upper surfaces of the cross-member and the shock absorber and/or the lower surfaces of the cross-member and the shock absorber, the at least two straps being at least partially separated from each other, and distributed in the transverse direction, each encircling the cross-member locally.

14. The bumper beam according to claim 2 , wherein the strap is continuous over the width of the shock absorber.

15. The bumper beam according to claim 1 wherein the at least two straps are completely separated from each other.

16. The bumper beam according to claim 5 wherein the lateral belt covers the lateral surface of the cross-member so as to connect the lateral surface of the shock absorber and a front surface of the bumper beam.

17. The bumper beam according to claim 6 wherein a thickness of the flank is greater than 4 mm.

18. The bumper beam according to claim 7 wherein the attachment element comprises a reinforcement rib extending between the attachment plate and front of the attachment element.

19. The bumper beam according to claim 9 wherein the attachment element is obtained by overmoulding the cross-member at the same time as overmoulding the entire shock absorber.

20. The bumper according to claim 11 wherein the attachment for a vehicle component is an electrical component and the stiffener is a motor vehicle door.

21. The bumper beam according to claim 12 wherein the constant shape is an omega (Ω), U or W shape.

22. The bumper beam according to claim 12 wherein the cross-member is made of metal or composite material.

23. The method of claim 13 wherein the overmolding step is used to manufacture the shock absorber and the attachment element simultaneously.