Patent ID: 8770939

Claim:
A turbine rotor blade assembly, comprising: a turbine rotor; and a plurality of turbine rotor blades implanted on the turbine rotor in a circumferential direction, the turbine rotor blades including a notch blade to be implanted last among the turbine rotor blades on the turbine rotor and an adjacent notch blade to be implanted adjacent to the notch blade, each of the turbine rotor blades comprising: an effective blade portion; a tangential type bucket dovetail disposed at a root portion of the effective blade portion; and a cover portion integrally formed on a tip of the effective blade portion, the cover portion mutually contacting an adjacent cover portion, the cover portion comprising a pressure-side overhanging portion protruded in the circumferential direction at a trailing edge side of the turbine rotor blade and a suction-side overhanging portion protruded in the circumferential direction at a leading edge side of the turbine rotor blade, wherein a length in a radial direction of a bucket dovetail of the notch blade is shorter than a length in the radial direction of the effective blade portion of the adjacent notch blade, and the length in the radial direction of the bucket dovetail of the notch blade is shorter than a length in the radial direction of the bucket dovetail of the adjacent notch blade, and wherein the length in the radial direction of the effective blade portion of the adjacent notch blade is shorter than the length in the radial direction of the bucket dovetail of the adjacent notch blade.