Device for blocking a ring for axially retaining a blade, associated rotor disk and retaining ring, and rotor and aircraft engine comprising them

A device for rotationally blocking a retaining ring on a rotor disk includes successive first and second blocking hooks of the disk, at least one cleat of the retaining ring arranged close to a split in the ring. The position of the at least one cleat on the retaining ring is such that, when the retaining ring is in place in a groove situated in the rotor disk, the at least one cleat is in abutment against the first blocking hook, and the split is covered by the second blocking hook.