Interfacing element for a lock zone of a motor vehicle door

1. An interfacing element of a lock zone of a door of a motor vehicle, the interfacing element comprising:

a support made of thermoplastic material and adapted to be attached to a lining of the door, the lining being made of thermoplastic material;

a reinforcing plate of the lock zone onto which a lock is adapted to be fastened, the reinforcing plate being integrated to the support by overmolding; and

wherein the thermoplastic material of the support has a Young's modulus lower than that of the thermoplastic material of the lining and a coefficient of elongation at break greater than that of the thermoplastic material of the lining.

2. The interfacing element according to claim 1 , wherein the reinforcing plate is made of metallic material or of composite material.

3. The interfacing element according to claim 1 , wherein the thermoplastic material of the support is made is more deformable than the thermoplastic material of the lining.

4. The interfacing element according to claim 1 , wherein the thermoplastic material of the support has properties as follows:

a Young's modulus between 500 MPa and 3000 MPa; and

a coefficient of elongation at break greater than 20%.

5. The interfacing element according to claim 1 , wherein the support is made of a material chosen from unreinforced polypropylene (PP), reinforced polypropylene, unreinforced polyethylene (PE), and reinforced polyethylene.

6. The interfacing element according to claim 1 , wherein the support has dimensions in the direction of a Y-axis of the motor vehicle and in the direction of a Z-axis of the motor vehicle greater than dimensions in the direction of the Y-axis of the motor vehicle and in the direction of the Z-axis of the reinforcing plate.

7. The interfacing element according to claim 1 , wherein the support has bosses around the reinforcing plate, which bosses form a hollow whose concavity is oriented in the direction of an X-axis of the motor vehicle with respect to the lining.

8. The interfacing element according to claim 1 , further comprising ribs so as to reinforce resistance of the support in the event of impact.

9. A sub-assembly of motor vehicle, the sub-assembly comprising:

a lining of the door, the door being a tailgate; and

the interfacing element according to claim 1 fastened onto an outer face of the lining.

10. The sub-assembly of motor vehicle according to claim 9 , wherein the interfacing element is fastened onto the outer face of the lining via at least one of a technology selected from the group consisting of gluing, welding, snap-riveting, overmolding, screwing, riveting, clipping and adhesive bonding.

11. The sub-assembly of motor vehicle according to claim 9 , wherein the interfacing element is fastened to the outer face of the lining by screwing.

12. The sub-assembly of motor vehicle according to claim 9 , further comprising a connecting member adapted to retain pieces of the interfacing element or of the lining that may be deformed in the event of an impact.

13. The sub-assembly of motor vehicle according to claim 12 , wherein the connecting member is made of thermoplastic material or glass fibers.

14. The sub-assembly of motor vehicle according to claim 13 , wherein the connecting member is a braid.

15. The sub-assembly of motor vehicle according to claim 11 , wherein the screwing is via a self-drilling screw.

16. The interfacing element according to claim 4 , wherein the support is made of a material having properties as follows:

a Young's modulus between 800 MPa and 2000 MPa; and

a coefficient of elongation at break between 20 and 80%.

17. The interfacing element according to claim 4 , wherein the support is made of a material having properties as follows:

a Young's modulus between 800 MPa and 2000 MPa; and

a coefficient of elongation at break greater than 80%.