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:
Apr. 29, 2003
Filed:
Jul. 12, 2001
Takeharu Ogimoto, Ikoma-gun, JP;
Takeshi Takahashi, Kashiba, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
There is provided a fluid dynamic bearing evaluating method capable of quantitatively observing a clearance between a shaft and a housing in an operating state and evaluating a fluid dynamic bearing more in detail. This fluid dynamic bearing evaluating method is to evaluate the fluid dynamic bearing by filling a space between the housing and the shaft with an uncharged lubricant, flowing a current through between the housing and the shaft and measuring an electrical resistance value of the fluid dynamic bearing including the lubricant. According to this evaluating method, the lubricant placed between the housing and the shaft is not electrically charged, and therefore, the measured electrical resistance value has a correlation with the clearance between the housing and the shaft , and the clearance can be quantitatively observed by this electrical resistance value.