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:
Mar. 12, 2002
Filed:
Mar. 24, 2000
Tadao Iwaki, Chiba, JP;
Shigeru Ohki, Chiba, JP;
Naoki Kawawada, Chiba, JP;
Atsushi Ohta, Chiba, JP;
Koji Nitadori, Chiba, JP;
Isamu Takehara, Chiba, JP;
Hiromitsu Goto, Chiba, JP;
Takafumi Suzuki, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
In order to alleviate mutual interference between axial dynamic pressure portions and a radial dynamic pressure portion in a ring-like hydraulic dynamic pressure bearing, in the case of a ring-like hydraulic dynamic pressure bearing constituted by supporting a shaft portion constituted by fixing a ring to an end portion A of a shaft main body by a bearing portion , ring-like spaces and for storing lubricant for generating dynamic pressure are provided along contiguous portions of the radial dynamic pressure bearing portion and the axial dynamic pressure bearing portions formed between the ring and the bearing portion , and the ring-like spaces and are maintained at atmospheric pressure via paths formed at the bearing portion to thereby prevent negative pressure from generating at boundary regions of the two dynamic pressure bearing portions.