<p>The rotor portion has several blades with blade root (20) that are provided inwardly facing bearing surfaces (34) in radial direction. The sheet-shaped sealing elements (30) are provided for guiding cooling medium along end-side rotor surface under action of centrifugal force on bearing surface. An opening (44) is formed in sealing element, for securing sealing elements against displacement in circumferential direction. A blocking element (46) is fitted in hole (58) which is formed in blade root, and opening in secured position by a Z-shaped securing plate against loss.</p>
