Retractable aerodynamic system for a motor vehicle

1. A retractable aerodynamic system for a motor vehicle comprising a structure of the vehicle, wherein the system comprises at least one aerodynamic flap, a drive means that can rotate the aerodynamic flap about a rotation axis, and at least one member for locking the aerodynamic flap in at least one indexed position with respect to the structure of the vehicle, the locking member being able to transmit forces experienced by the aerodynamic flap to the structure of the vehicle when the aerodynamic flap is locked in one of the at least one indexed positions, the locking member comprising at least one assembly consisting of a spring element and a housing arranged to accommodate at least a portion of the spring element, the housing and the spring element being arranged to be assembled to one another with little clearance.

2. The system according to claim 1 , wherein the locking member is able to transmit the forces experienced to lock the aerodynamic flap without any force exerted by the drive means.

3. The system according to claim 1 , wherein the housing and the spring element are arranged to be assembled to one another with less clearance than all other clearances present in the rest of the system.

4. The system according to claim 1 , wherein the housing comprises a cavity.

5. The system according to claim 4 , wherein the housing has a concave shape with a depth of 2 to 5 mm.

6. The system according to claim 1 , wherein the spring element is arranged to disengage from the housing when a torque exerted about the rotation axis is greater than a predetermined threshold.

7. The system according to claim 6 , wherein the predetermined threshold is 50% of the maximum forces experienced by the aerodynamic flap when driving.

8. The system according to claim 1 , further comprising a disengagement member for disengaging a connection between the drive means and the aerodynamic flap.

9. The system according to claim 1 , wherein the housing of the locking member's at least one assembly is located on the aerodynamic flap.

10. The system according to claim 1 , wherein the housing of the locking member's at least one assembly is located far away from the drive means.

11. The system according to claim 10 , wherein the housing of the locking member's at least one assembly is located near a centre of thrust of the aerodynamic flap.

12. The system according to claim 1 , wherein the housing of the locking member's at least one assembly is located near the drive means.

13. The system according to claim 1 , comprising at least two housings comprising cavities having different depths.

14. The system according to claim 1 , comprising at least two housings arranged in the system in order to lock the same one of the at least one indexed positions.

15. The system according to claim 1 , comprising means for connecting the aerodynamic flap to the structure of the vehicle, the connecting means being arranged to allow the aerodynamic flap to rotate about the rotation axis in which the spring element is attached to the connecting means.

16. The system according to claim 15 , wherein the locking member, the rotation axis, and the connecting means are made of stainless steel, treated steel or low-friction plastic.

17. The system according to claim 1 , wherein one of the at least one indexed positions of the aerodynamic flap is a position in which the aerodynamic flap makes an angle of at least 40° relative to the aerodynamic flap in a closed position.

18. The system according to claim 17 , wherein one of the at least one indexed positions of the aerodynamic flap is a position in which the aerodynamic flap makes an angle between 40° and 90° relative to the aerodynamic flap in the closed position.

19. The system according to claim 1 , wherein the housing and the spring element are arranged to be assembled to one another with zero clearance.