The outer rim (4) is half as thin as the nave (3) on both sides, which is necessary as distance between adjacent outer rims for the introduction of a welding set to the naves. The outer rims of the rotor disks (2) form striker strip retainers and incorporate edge recesses (5) aligned with one another. The formed part pieces (7) of the outer rims in a peripheral direction and against the direction of rotation (a) are formed narrowed from their sides.
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