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:
Sep. 05, 2006
Filed:
Dec. 03, 2003
Takafumi Asada, Hirakata, JP;
Hiroaki Saito, Ozu, JP;
Keigo Kusaka, Ozu, JP;
Daisuke Itou, Neyagawa, JP;
Takafumi Asada, Hirakata, JP;
Hiroaki Saito, Ozu, JP;
Keigo Kusaka, Ozu, JP;
Daisuke Itou, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A sleeveis fixed on a base. Radial dynamic-pressure generating groovesA andB are provided on an inner surface of the sleeve. A thrust platehermetically seals a lower opening end of the sleeve. A shaftis inserted inside the sleeve, being allowed to revolve. A flangeis fixed at the bottom end of the shaft, and its lower surface is placed close to an upper surface of the thrust plate. Thrust dynamic-pressure generating groovesA andB are provided on the surfaces of the flange. Gaps A–H among the sleeve, the shaft, the flange, and the thrust plateare filled with a lubricant. HollowsC–F are provided on the inner surface of the sleeve. The gaps A and C over the thrust dynamic-pressure generating groovesA andB and their vicinities are narrower than the surrounding gaps B and D (A<B, A<D, C<B, and C<D), and the surrounding gaps B and D are narrower than the gap H in the upper opening end of the sleeveand its vicinity (B<H and D<H). The gaps E and G over the radial dynamic-pressure generating grooves and their vicinities are narrower than the surrounding gaps D and F (E<D, E<F, G<D, and G<F), and the surrounding gaps D and F are narrower than the gap H in the upper opening end of the sleeveand its vicinity (D<H and F<H).