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:
Jul. 25, 2000
Filed:
Nov. 06, 1998
Yoshinao Okawa, Ibaraki, JP;
Yoshihiro Murano, Chiba, JP;
Isao Ito, Ibaraki, JP;
Kenichi Okada, Chiba, JP;
Kazuo Funabashi, Ibaraki, JP;
Masanori Miyamoto, Ibaraki, JP;
Kiyohito Mizuide, Chiba, JP;
Hirotugu Kinoshita, Yokohama, JP;
Fumihiro Itano, Yokohama, JP;
Takeshi Uesugi, Tokyo, JP;
Kabushiki Kaisha Meidensha, Tokyo, JP;
Kandenko Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a rotating electric machine including (a) a rotor having a rotating shaft; (b) a bearing for supporting the rotating shaft; (c) a radiation resistant grease applied to the bearing; and (d) a shield layer for shielding the grease from radiation. The shield layer is made of lead and surrounds the bearing. The shield layer includes (1) a first cylindrical shield member that is positioned to cover the bearing, such that the bearing is shielded from a first radiation that is in a direction substantially perpendicular to an axis of the rotating shaft, and (2) second and third disk shield members that are positioned to interpose therebetween the bearing in a direction along the axis of the rotating shaft, such that the bearing is shielded from a second radiation that is in a direction substantially along the axis of the rotating shaft. Thus, the rotor of this rotating electric machine is stably supported in the bearing for a long time even under a highly radioactive environment. That is, the rotating electric machine can be rotated stably for a long time.