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1. (WO2017097424) VEHICLE UNDERBODY STRUCTURE COMPRISING A REINFORCEMENT ELEMENT BETWEEN A LONGITUDINAL BEAM AND A LOWERSIDE SILL PART
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CLAIMS

1. - Vehicle underbody structure, comprising a floor panel (1); at least one longitudinal beam (2) extending in a longitudinal direction of the vehicle under said floor pane! (1) and at least one lowerside sill part (4) extending in the. longitudinal direction adjacent to the floor panel (1), the vehicle underbody structure further comprising at least one reinforcement element (6) extending in a transversal direction, substantially perpendicular to the longitudinal direction, said reinforcement element (6) extending under the floor panel (1) and being attached at one of its transversal ends to the longitudinal beam (2) and at the other of its transversal ends to the lowerside sill part (4), characterized iii that the reinforcement element (6) is made of a press-hardened steel part having a tensile strength higher or equal to 1200 MPa.

2. - Vehicle underbody structure according to claim 1, wherein the reinforcement element (6) has a martensitic microstructure and wherein at least one of the longitudinal beam (2) and lowerside sill part (4) has a structure which is not fully martensitic.

3. - Vehicle underbody structure according to claim 2, wherein both the longitudinal beam (2) and lowerside sill part (4) have a structure which is not fully martensitic.

4. - Vehicle underbody structure according to anyone of claims 1 to 3, wherein the reinforcement element (6) comprises a first flank (20) extending in a plane substantially parallel to the floor panel (1) and a second flank (22) extending in a plane perpendicular to the first flank (20), said first and second flanks (20, 22) both joining the longitudinal beam (2) to the lowerside sill part (4).

5. - Vehicle underbody structure according to claim 4, wherein the second flank (22) extends in a plane forming a non-zero angle with the longitudinal direction.

6. - Vehicle underbody structure according to claim 4 or 5, wherein the first flank (20) has a substantially triangular shape, a first side (24) of said triangle extending along the longitudinal beam (2), a second side (26) of said triangle joining the longitudinal beam (2) to the lowerside sill part (4) and a third side (28) of said triangle extending along the second flank (22).

7. - Vehicle underbody structure according to anyone of claims 1 to 6, wherein the reinforcement element (6) is attached to the lowerside sill part (4) at a front longitudinal end (14) of said lowerside sill part (4).

8. - Vehicle underbody structure according to anyone of claims 1 to 7, wherein the reinforcement element (6) is welded to the longitudinal beam (2) and to the lowerside sill part (4).

9. - Vehicle underbody structure according to claim 8, wherein the welding of the reinforcement element (6) to the longitudinal beam (2) and to the lowerside sill part (4) is a resistance spot welding or an arc welding or a laser welding.

10. ^ Vehicle underbody structure according to anyone of claims 1 to 9, wherein ttie composition of the press hardened steel comprises in % weight

- 0.15% .≤ C < 0.5%, 0.5%≤ Mn≤ 3%, 0.1%≤ Si≤ 1%, 0.005% < Cr < 1%, Ti≤ 0.2%, Al≤ 0.1%, S≤ 0.05%, P < 0.1%, B≤ 0.010%, the remainder being iron and unavoidable impurities resulting from the elaboration or

- 0.20% < C≤ 0.25%, 1.1%≤ Mn≤ 1.4%, 0.15%≤ Si≤ 0.35%,≤ Cr≤ 0.30%, 0.020% < Ti≤ 0.060%, 0.020%≤ Al≤ 0.060%, S < 0.005%, P≤ 0.025%, 0.002%≤ B ≤ 0.004%, the remainder being iron and unavoidable impurities resulting from the elaboration; or

- 0.24%≤ C≤ 0.38%, 0.40%≤ Mn < 3%, 0.10%≤ Si < 0.70%, 0.015%≤ Al≤ 0.070%, Cr < 2%, 0.25% < Ni < 2%, 0.015%≤Ti≤ 0.10%, Nb≤ 0.060%, 0.0005% ≤ B < 0.0040%, 0.003% ≤ N < 0.010%, S < 0,005%, P < 0,025%, %, the remainder being iron and unavoidable impurities resulting from the elaboration.

11 - Vehicle underbody structure according to anyone of claims 1 to 10, wherein the press hardened steel part is coated.

12.- Vehicle underbody structure according to anyone of claims 1 to 11, further comprising a front pillar (18) attached to the lowerside sill part (4) and extending in an elevation direction substantially perpendicular to the longitudinal and transversal directions, said front pillar (18) extending from a longitudinal front end (14) of the lowerside sill part (4).

13. Vehicle underbody structure according to anyone of claims 1 to 12, comprising a floor pane! (1), a left longitudinal beam (2) and a right longitudinal beam (2), both extending in the longitudinal direction under said floor panel (1), and a left lowerside sill part (4) and a right lowerside sill part (4), extending in the longitudinal direction on. either side of the floor panel (1), a left reinforcement element (6) extending between the left longitudinal beam (2) and the left lowerside sill part (4) and a right reinforcement element (6) extending between the right longitudinal beam (2) and the right lowerside sill part (4), said left and right reinforcement elements (6) being made of a press hardened steel part having a tensile strength higher or equal to 200 MPa.

14 - Vehicle underbody structure according to claim 13, further comprising a transversal beam (40) extending between the left longitudinal beam (2) and the right longitudinal beam (2), said transversal beam (40) extending along the same transversal axis as the left and right reinforcement elements (6); said transversal beam (40) being made of a press hardened steel part having a tensile strength higher or equal to 1200 MPa.

15. Vehicle body comprising a vehicle underbody structure according to anyone of claims 1 to 14.