US 7,387,494 B2
Finger dovetail attachment between a turbine rotor wheel and bucket for stress reduction
Gary Edward Yehle, Clifton Park, N.Y. (US); Thomas Joseph Farineau, Schoharie, N.Y. (US); and Yavuz Kadioglu, Mechanicville, N.Y. (US)
Assigned to General Electric Company, Schenectady, N.Y. (US)
Filed on Apr. 28, 2005, as Appl. No. 11/116,186.
Prior Publication US 2006/0245927 A1, Nov. 02, 2006
Int. Cl. F01D 5/30 (2006.01)
U.S. Cl. 416—217  [416/220 R] 7 Claims
OG exemplary drawing
 
1. A rotor wheel for a turbine comprising:
a plurality of fingers spaced axially one from another and extending circumferentially about a margin of the wheel for receiving fingers of buckets;
said wheel fingers including a plurality of circumferentially extending sections of successively reduced axial extent in a radial outward direction;
each of said wheel fingers having fillets at transitions between radially adjacent sections;
each wheel finger fillet being comprised of first and second radii with the first radius having a larger radius than the second radius; and
wherein axially adjacent wheel fingers at radially innermost locations along the wheel margin define a bottom of a generally dovetail-shaped slot between the adjacent wheel fingers, the bottom of said slot having a pair of fillets with each bottom slot fillet comprised of first and second radii with the first radius of each bottom slot fillet having a larger radius than the second radius thereof, wherein the bottom of said slot includes a flat extending axially and circumferentially between the second radius of each of said pair of bottom slot fillets.