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. 12, 2010
Filed:
Sep. 28, 2005
Yasunori Tokuno, Saijyo, JP;
Toshinori Takasuka, Ozu, JP;
Taizo Ikegawa, Ozu, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A hydrodynamic bearing device which realizes power saving, reduction of a time period necessary for stabilizing rotation, and enhancement in durability to startup and halting of the motor at the same time by accelerating circulation of a lubricant in the vicinity of a flange with torque loss being kept low is provided. A flange () is fixed to one end of a shaft (). On an inner surface of one of openings of a sleeve (), a step portion (C) is provided. When the shaft () is inserted into the sleeve (), the flange () is in close vicinity to the step portion (C). An inner diameter of the step portion (C) is smaller in end portions in an axial direction than in a central portion. Thus, a gap between an outer surface (C) of the flange () and a surface of the step portion (C) which opposes the outer surface (C) is narrow in the vicinity of boundaries of the outer surface (C) of the flange () than in the vicinity the central portion.