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. 27, 2007
Filed:
Dec. 01, 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
Radial dynamic pressure grooves are provided in a first regionA and a second regionB on the side of a fixed shaft. A ventD is provided inside the top endA of the fixed shaft. The ventD connects spaces over and under a flangeto each other. The flangein an annular shape is fixed at the top endA of the fixed shaft. Thrust dynamic pressure groovesA andB are provided on the surfaces of the flange. A circulation holeC is provided in the flange, and connects spaces over and under the flangeto each other. A sleeverevolves around the fixed shaft. A thrust platein an annular shape is fixed at the top of the sleeveand opposed to the flange. The first regionA, the second regionB, the thrust dynamic pressure groovesA andB, and the circulation holeC of the flangeare filled with a lubricant. At the revolution of the sleeve, the lubricantis concentrated in each central part of the first regionA, the second regionB, and the thrust dynamic pressure groovesA andB and their vicinities, then raising the pressure. The sleevekeeps its stable high-speed revolution, avoiding contact with the fixed shaft. The lubricantcirculates on surfaces of the flangethrough the circulation holeC.