Motor vehicle trunk lid

1. A trunk lid for a motor vehicle, comprising:

an inner lining;

a rear window; and

a structural reinforcement including an upper portion which defines a rear-window opening and a lower portion which extends from the upper portion toward a bottom of the trunk lid, wherein

the structural reinforcement single piece of a polymer material,

an outside of the structural reinforcement is completely covered at least by the rear window and with an outer covering panel placed beneath the rear window, and

an inside of the structural reinforcement is completely covered by the inner lining, the structural reinforcement and the inner lining interacting to form a first hollow frame, of a first closed section, surrounding the rear-window opening, and to form a second peripheral hollow frame, of a second closed section, that is close to outer edges of the trunk lid.

2. The trunk lid as claimed in claim 1 , wherein the upper portion of the structural reinforcement comprises lateral uprights on either side of the rear-window opening, and the structural reinforcement and the inner lining interact to form the first and second hollow frames of first and second closed sections, the sections being indistinguishable at the lateral uprights.

3. The trunk lid as claimed in claim 1 , wherein the upper portion of the structural reinforcement comprises an upper upright placed above the rear-window opening, and the structural reinforcement and the inner lining interact to form first and second hollow frames of the first and second closed sections, the sections being indistinguishable at the upper upright of the rear-window opening.

4. The trunk lid as claimed in claim 1 , wherein the structural reinforcement and the inner lining interact to form the first and second hollow frames of the first and second closed sections, said sections comprising a portion of hollow shape which belongs to the structural reinforcement, a concavity of the hollow shape is oriented toward the inside of the vehicle, and extended by a connection zone on each side of the hollow shape, and said sections comprising a portion of the inner lining, which encloses the portion of hollow shape of the reinforcement by attachment at the connection zones.

5. The trunk lid as claimed in claim 1 , wherein the inner lining comprises a sealing track that is generally continuous and designed to interact with a weather seal of the vehicle.

6. The trunk lid as claimed in claim 1 , further comprising, fixedly attached to the structural reinforcement above said window, a spoiler made of a polymer material.

7. The trunk lid as claimed in claim 1 , wherein the structural reinforcement includes additional reinforcements connecting a lower horizontal side of the first frame to a lower horizontal side of the second peripheral frame.

8. A motor vehicle, comprising:

the trunk lid as claimed in claim 1 .

9. The trunk lid as claimed in claim 1 , wherein the polymer material of the structural reinforcement is a thermoplastic material.

10. The trunk lid as claimed in claim 9 , wherein the inner lining is a thermoplastic material.

11. The trunk lid as claimed in claim 1 , wherein the inner lining is a single piece of polymer material.

12. The trunk lid as claimed in claim 11 , wherein the polymer material of the inner lining is a thermoplastic material.

13. The trunk lid as claimed in claim 6 , wherein the polymer material of the spoiler is thermoplastic or thermosetting.