Patent ID: 8770938

Claim:
A rotor for an axial-throughflow turbomachine, the rotor carries a plurality of moving blades which are pushed, in each case, with a blade root into a rotor groove extending about an axis and are held there, with the blade root comprising a hammer root with a hammerhead and being supported on radial stop faces of the rotor groove which lie further out in the radial direction, against centrifugal forces which act on the plurality of moving blades, and being supported on axial stop faces lying further inward in the radial direction, against axial forces which act on the plurality of moving blades, the rotor groove having at a bottom portion, in order to reduce thermal stresses, an axially and radially widened bottom region with a continuously curved cross-sectional contour, wherein the bottom region radially extends beyond a lowermost stop face, and the bottom region is axially widened beyond the radial and axial stop faces, the blade root of the plurality of moving blades is adapted to the widened bottom region in a radial direction; and wherein the widened bottom region has a predetermined maximum width (d 1 ) in an axial direction, the radial stop faces have a predetermined minimum distance (d 5 ) in the axial direction, and a ratio of the minimum distance (d 5 ) to the maximum width (d 1 ) is between 0.1 and 0.6, namely 0.1<d 5 /d 1 <0.6 the widened bottom region has a predetermined first maximum depth (d 4 ) in relation to the radial stop faces, the widened bottom region has a predetermined second maximum depth (d 3 ) in relation to inner edges of the axial stop faces, and a ratio of the second maximum depth (d 3 ) to the first maximum depth (d 4 ) is between 0.4 and 0.9, namely 0.4<d 3 /d 4 <0.9.