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:
May. 28, 2013
Filed:
May. 21, 2008
Akiyoshi Takahashi, Iruma, JP;
Toshiya Uchida, Iruma, JP;
Akiyoshi Takahashi, Iruma, JP;
Toshiya Uchida, Iruma, JP;
Nidec Copal Electronics Corporation, Tokyo, JP;
Abstract
In a gas dynamic pressure bearing mechanism () for smoothing rotary motion of a shaft () by feeding gas to the bearing clearance between the shaft () and a fixed sleeve () for supporting the shaft () through a herring bone groove (), the herring bone groove () is provided in the shaft () such that pressure distribution generated in the bearing clearance moves at a high speed. The herring bone groove () consists of N grooves such that N minimal pressure values appearing alternately with maximal pressure values at the positions where the maximal pressure values of dynamic pressure variation appear in the bearing clearance when the shaft () rotates have such an interval as it becomes lower than the condensation pressure value.