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:
Jan. 17, 1984
Filed:
Dec. 01, 1981
Keiichi Tsuchiya, Tokyo, JP;
Katsukuni Hisano, Hitachi, JP;
Toshimi Tan, Hitachi, JP;
Masahiro Kobayashi, Hitachi, JP;
Kei Kobayashi, Kitaibaraki, JP;
Kazuhiko Ueda, Hitachi, JP;
Seishin Kirihara, Hitachi, JP;
Takatoshi Yoshioka, Hitachi, JP;
Masao Shiga, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A rotor shaft suitable for use as the rotor shaft of a steam turbine. The rotor shaft has a rotor shaft portion made of a Cr alloy steel having martensite structure and containing 8 to 13% Cr. The rotor shaft body is provided with at least one journal portion at which the rotor shaft is rotatably supported by a bearing. The rotor shaft further has a sleeve fitted around each journal portion. The sleeve is divided in the circumferential direction into a plurality of segments which are assembled together by welding or fitting into the sleeve having a circular cross-section. Due to the provision of the sleeve around the journal portion, the rotor shaft made of Cr alloy steel can have improved bearing properties.