Method for fastening a cover on an orifice of a power steering system and such a cover

1. An assembly comprising:

a cover, and

a casing comprising at least one seat for fastening the cover, the at least one seat is a fastening seat delimiting an orifice, the cover being configured to seal the orifice, the fastening seat comprising a support wall for the cover, wherein the fastening seat also comprises at least one elongation portion disposed outside the support wall, the at least one elongation portion being provided with at least one deformation area configured to be folded over the cover,

wherein the cover comprises a groove around an outer periphery of the cover configured to accept an O-ring between the outer periphery of the cover and an inner surface of the fastening seat, and

wherein the casing is a casing of a power steering system of a motor vehicle.

2. The assembly according to claim 1 , wherein the inner surface of the fastening seat delimiting the orifice, the support wall extending in a direction substantially transverse to the inner surface.

3. The assembly according to claim 2 , wherein the at least one elongation portion extends along a direction substantially parallel to the inner surface.

4. The assembly according to claim 1 , wherein the at least one elongation portion is a single elongation portion that continuously surrounds the support wall.

5. The assembly according to claim 1 , wherein the at least one deformation area is comprised of a plurality of deformation areas evenly distributed over the at least one elongation portion.

6. The assembly according to claim 1 , further comprising the O-ring.

7. The assembly according to claim 1 , wherein the cover further comprises ribs on a surface of the cover extending radially from a center of the cover to an outer circumference of the cover.

8. A method for fastening the cover on the fastening seat of the casing according to claim 1 , comprising inserting the cover into the orifice so that a holding edge of the cover is in contact with the support wall, and deforming the at least one deformation area over the holding edge.

9. The method according to claim 8 , wherein the deforming is carried out by means of a mechanical material folding method.

10. The method according to claim 8 , wherein, during the deforming, the at least one deformation area is folded by exerting a pressure along a direction substantially parallel to the support wall.

11. The method according to claim 8 , wherein, during the deforming, the at least one deformation area is folded by exerting a pressure along a direction substantially transverse to the support wall.