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:
Jun. 21, 1994
Filed:
Apr. 21, 1993
Tadashi Kataoka, Kanagawa, JP;
Shunsuke Mimura, Kanagawa, JP;
Yoichi Kanemitsu, Kanagawa, JP;
Yoshiyuki Maruta, Kanagawa, JP;
Tatsuo Hinata, Kanagawa, JP;
Mamoru Suzuki, Kanagawa, JP;
Manabu Toshimitsu, Kanagawa, JP;
Shunichi Aiyoshizawa, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
A dynamic pressure bearing is provided with a moving side bearing member and a fixed side bearing member so as to support a rotor for rotation by generating a fluid dynamic pressure between the moving side bearing member and the fixed side bearing member. The dynamic pressure bearing includes a high-frequency exciting device for applying a high-frequency vibration to the fixed side bearing member at the time of at least one of start-up and shutdown of the rotor. In this way, both bearing members are kept almost free from contact with each other and a frictional resistance at start-up and/or shutdown is minimized.