Rotor for an axial-throughflow turbomachine and moving blade for such a rotor

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;

• wherein a lengthening bolt extending in the radial direction is integrally formed onto the blade root below the hammerhead in order to bridge the radial widening of the widened bottom region;
• and
• wherein the hammerhead has a predetermined height (d7), the lengthening bolt has a predetermined radial length (d6), and the ratio of height to length (d7/d6) is between 0.2 and 0.8, namely 0.2<d7/d6<0.8, the hammerhead has a predetermined first axial width (d8), the lengthening bolt has a predetermined second axial width (d9), and a ratio of the second to the first axial width (d9/d8) is between 0.2 and 0.6, namely 0.2<d9/d8<0.6.

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;

• the moving blade comprising a blade root designed as a hammer root with a hammerhead, the blade root is extended in the radial direction below the hammerhead in order to bridge the radial widening of the widened bottom region of the rotor groove;
• wherein a lengthening bolt extending radially is provided for lengthening the blade root;
• and
• wherein the hammerhead has a predetermined height (d7), the lengthening bolt has a predetermined radial length (d6), and a ratio of height to length (d7/d6) is between 0.2 and 0.8, namely 0.2<d7/d6<0.8.