The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2016
Filed:
Aug. 20, 2012
Kota Nagano, Hitachinaka, JP;
Kunio Asai, Hitachi, JP;
Kota Nagano, Hitachinaka, JP;
Kunio Asai, Hitachi, JP;
Mitsubishi Hitachi Power Systems, Ltd., Yokohama, JP;
Abstract
A blade avoids fretting damage while reducing stress occurring at the neck portion caused by a stress relief groove. The blade is disposed on an outer periphery of a rotor, and includes 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 dovetail portion has a width that increases toward its bottom side 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.