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:
Aug. 25, 1992
Filed:
Nov. 09, 1990
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A dynamic pressure type fluid bearing device includes: a shaft; a sleeve into which the shaft is fitted to be rotatable relative to the shaft; two dynamic pressure generating grooves provided on either peripheral surface of the shaft or the inner peripheral surface of the sleeve; and a lubricant held between the shaft and the sleeve. The device has a void, enclosing air, interposed between the two dynamic pressure generating grooves, wherein each of the dynamic pressure generating grooves is not less than four microns in depth and makes an acute angle of less than 20.degree. with a rotational direction of the shaft or the sleeve. The fluid bearing device can include: a sleeve; a shaft fitted into the sleeve, one end surface of which is in contact with a thrust bearing fixed to the sleeve; a dynamic pressure generating groove provided on either the inner peripheral surface of the sleeve or the peripheral surface of the shaft; and a lubricant provided to enclose a space between the shaft and the sleeve as well as the thrust bearing, wherein the dynamic pressure generating groove is not less than four microns in depth and makes an acute angle of less than 17.degree. with a rotational direction of the shaft or the sleeve.