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:
Nov. 30, 2010
Filed:
Apr. 03, 2007
Fumiyuki Suzuki, Hitachi, JP;
Kunio Asai, Hitachi, JP;
Takeshi Kudo, Hitachi, JP;
Tateki Nakamura, Hitachi, JP;
Fumiyuki Suzuki, Hitachi, JP;
Kunio Asai, Hitachi, JP;
Takeshi Kudo, Hitachi, JP;
Tateki Nakamura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A turbine rotor improved in machinability, appropriately balanced in stress, and having rotor hooks and rotor necks constructed to form an attachment structure with respect to an inverted fir tree blade root that has blade hooks and blade necks. The turbine rotor has rotor hooks and rotor necks constructed to form an attachment structure with respect to an inverted fir tree blade root that has blade hooks and blade necks with an 'n' number of hooks, where n≧3. In this structure, a convex portion of the innermost circumferential rotor hook is formed to be concave in a circumferential direction, with respect to a tangential line that connects a convex portion of the (n−1)th hook from the outermost circumferential rotor hook, and a convex portion of the (n−2)th hook.