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. 15, 2002
Filed:
Jan. 27, 2000
Narito Shimizu, Nagoya, JP;
Makio Kato, Mie, JP;
Tatsuo Hisada, Tokoname, JP;
Jun Yatazawa, Tokai, JP;
Daido Tokushuko Kabushiki Kaisha, Nagoya, JP;
Abstract
A bearing mechanism eliminates the need for lubricating oil, is capable of generating enough radial dynamic pressure even in lower-speed regions, and yet can be easily surface-machined for the generation of radial dynamic pressure and manufactured with low cost. In at least either one of an outer circumferential surface of a first member or an inner circumferential surface of a second member (hereinafter, referred to as roughened surface), the two circumferential surfaces being opposed to each other with a bearing gap G therebetween, dot-like minute dips and bumps are formed dispersedly, by which the surface is roughened so that its center-line mean roughness is controlled within a range of 0.1 &mgr;m-1.0 &mgr;m. With this arrangement, since enough radial dynamic pressure can be generated at a relatively low rotational speed, time duration of a dynamic-pressure insufficiency upon a start-up or halt of the rotating mechanism is shortened so that members in the bearing part can be made less liable to wear.