Patent ID: 9341068
Filing Date: 2016-05-17
CPC Classification: F01D,F05D

Claim Text:
1. A blade disposed on an outer periphery of a rotor, comprising: a blade portion; a dovetail portion for holding the blade on the rotor; a platform portion that connects the dovetail portion and the blade portion; and a stress relief groove that connects a side surface of the platform portion and a blade load bearing surface of the dovetail portion, the stress relief groove disposed only in a range outside in a widthwise direction of the platform portion relative to the side surface of the platform portion, on a bottom side of the dovetail portion relative to an intersection point between the side surface of the platform portion and the stress relief groove, wherein the dovetail portion has a width that increases toward the bottom side thereof within a range from a connection point between the side surface of the platform portion and the stress relief groove to a connection point between the dovetail portion and the stress relief groove.