TURBINE BUCKET DOVETAIL OF AXIAL INSERTION TYPE HAVING INTEGRATED ROTATION-PREVENTING KEY

PROBLEM TO BE SOLVED: To provide a dovetail joint of an axial insertion type between a turbine wheel and a turbine bucket. SOLUTION: An axial insertion type dovetail 16 on a bucket 14 is axially installed in a female dovetail of a complementary form provided in the circumference of a rim of a turbine wheel. The bucket includes a bucket cover to be fitted and engaged as the bucket is rotated to be radially inwardly displaced when installed. For eliminating rotation and radial displacement of the bucket, a rotation preventing key is installed to be received in a recessed part 42 in a roughly complementary form at a base part of the female dovetail. The rotation preventing key 40 in the slot eliminates rotation and radial displacement of the bucket to hold the bucket on a radius to enable the bucket cover to be machined into proper size. COPYRIGHT: (C)2004,JPO&NCIPI